TPS7A53-Q1 [TI]
汽车类 3A、低输入电压 (1.1V)、低噪声、高精度、超低压降 (LDO) 稳压器;型号: | TPS7A53-Q1 |
厂家: | TEXAS INSTRUMENTS |
描述: | 汽车类 3A、低输入电压 (1.1V)、低噪声、高精度、超低压降 (LDO) 稳压器 稳压器 |
文件: | 总42页 (文件大小:2993K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
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TPS7A53-Q1
ZHCSHB7B –SEPTEMBER 2017–REVISED JULY 2018
TPS7A53-Q1 3A 高精度汽车级低噪声 LDO 稳压器
1 特性
3 说明
1
•
•
符合汽车类应用的 要求
符合面向汽车应用的 AEC-Q100 标准
TPS7A53-Q1 器件是一款低噪声 (4.4µVRMS)、低压降
线性稳压器 (LDO),可提供 3A 电流,同时最大压降仅
为 180mV。该器件的输出电压可通过外部电阻分压器
进行调节,范围为 0.8V 至 5.15V。
–
–
–
温度等级 1:–40°C ≤ TA ≤ +125°C
HBM ESD 分类等级 2
CDM ESD 分类等级 C4A
TPS7A53-Q1 集低噪声 (4.4µVRMS)、高 PSRR 和高输
出电流能力等特性于一体,因此非常适合为雷达功率和
信息娱乐等 应用中的噪声敏感型组件供电。此器件的
优秀性能可抑制电源产生的相位噪声和时钟抖动,因此
非常适合为射频放大器、雷达传感器和芯片组供电。射
频放大器尤其受益于该器件的高性能和 5.0V 输出能
力。
•
•
扩展结温 (TJ) 范围:–40°C 至 +150°C
输入电压范围:
–
–
无偏置:1.4V 至 6.5V
有偏置:1.1V 至 6.5V
•
•
可调输出电压范围:0.8V 至 5.15V
低压降:3A 电流时为 180mV(最大值)(带偏
置)
对于需要以低输入和低输出 (LILO) 电压运行的数字负
载,例如专用集成电路 (ASIC)、现场可编程门阵列
(FPGA) 和数字信号处理器 (DSP),TPS7A53-Q1 所具
备的极高的精度(在负载和温度范围内可达 1%)、遥
感功能、出色的瞬态性能和软启动能力可确保实现出色
的系统性能。
•
•
•
输出电压噪声:4.4µVRMS
线路、负载和温度范围内的偏置精度最大值为 1%
电源纹波抑制:
–
500kHz 时为 40dB
•
•
•
可调软启动浪涌控制
开漏电源正常 (PG) 输出
封装:
TPS7A53-Q1 器件的多功能性使其非常适合许多严苛
的 应用。
–
–
3.5mm × 3.5mm 20 引脚 VQFN
具有可湿性侧面和高 CTE (12ppm/ºC) 塑封料的
4mm × 4mm 20 引脚 VQFNP
器件信息(1)
器件型号
封装
封装尺寸(标称值)
超薄四方扁平无引线
封装 (VQFN) (20)
2 应用
3.50mm x 3.50mm
TPS7A53-Q1
•
•
•
远程信息处理控制单元
VQFNP (20)
(具有可湿性侧面)
4.00mm x 4.00mm
信息娱乐系统和仪表组
高速接口(PLL 和 VCO)
(1) 如需了解所有可用封装,请参阅产品说明书末尾的封装选项附
录。
为射频组件供电
输出电压噪声与
频率和输出电压间的关系
Bias Supply
2
VOUT = 5.0 V, 11.7 mVRMS
BIAS
1
Input Supply
EN Signal
VOUT = 3.3 V, 8.3 mVRMS
IN
VOUT = 1.5 V, 5.4 mVRMS
VOUT = 0.8 V, 4.5 mVRMS
0.5
OUT
TPS7A53-Q1
0.2
0.1
EN
PG
0.05
VCC
0.02
0.01
Radar
Sensor System
EN
0.005
0.002
0.001
1x101
1x102
1x103
1x104
1x105
1x106 5x106
Frequency (Hz)
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
English Data Sheet: SBVS298
TPS7A53-Q1
ZHCSHB7B –SEPTEMBER 2017–REVISED JULY 2018
www.ti.com.cn
目录
1
2
3
4
5
6
特性.......................................................................... 1
应用.......................................................................... 1
说明.......................................................................... 1
修订历史记录 ........................................................... 2
Pin Configuration and Functions......................... 3
Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information.................................................. 5
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics.............................................. 7
Detailed Description ............................................ 14
7.1 Overview ................................................................. 14
7.2 Functional Block Diagram ....................................... 14
7.3 Feature Description................................................. 15
7.4 Device Functional Modes........................................ 19
8
9
Application and Implementation ........................ 20
8.1 Application Information............................................ 20
8.2 Typical Application .................................................. 28
Power Supply Recommendations...................... 29
10 Layout................................................................... 29
10.1 Layout Guidelines ................................................. 29
10.2 Layout Example .................................................... 30
11 器件和文档支持 ..................................................... 31
11.1 器件支持................................................................ 31
11.2 文档支持................................................................ 31
11.3 接收文档更新通知 ................................................. 31
11.4 社区资源................................................................ 31
11.5 商标....................................................................... 31
11.6 静电放电警告......................................................... 31
11.7 术语表 ................................................................... 31
12 机械、封装和可订购信息....................................... 32
7
4 修订历史记录
注:之前版本的页码可能与当前版本有所不同。
Changes from Revision A (February 2018) to Revision B
Page
•
已添加 添加了新的 RTK 封装(具有可湿性侧面的 VQFNP)................................................................................................ 1
Changes from Original (September 2017) to Revision A
Page
•
将“产品预览”更改成了“生产数据”(有效).............................................................................................................................. 1
2
Copyright © 2017–2018, Texas Instruments Incorporated
TPS7A53-Q1
www.ti.com.cn
ZHCSHB7B –SEPTEMBER 2017–REVISED JULY 2018
5 Pin Configuration and Functions
RGR Package
3.5-mm × 3.5-mm, 20-Pin VQFN
Top View
RTK Package
4-mm × 4-mm, 20-Pin VQFNP
Top View
OUT
NC
1
2
3
4
5
15
14
13
12
11
IN
OUT
NC
1
2
3
4
5
15
14
13
12
11
IN
EN
EN
Thermal
Pad
Thermal pad
FB
NR/SS
BIAS
NC
FB
NR/SS
BIAS
NC
PG
PG
DNC
DNC
Not to scale
Not to scale
Pin Functions
PIN
NAME
NO.
I/O
DESCRIPTION
BIAS supply voltage. This pin enables the use of low-input voltage, low-output (LILO) voltage conditions
(that is, VIN = 1.2 V, VOUT = 1 V) to reduce power dissipation across the die. The use of a BIAS voltage
improves dc and ac performance for VIN ≤ 2.2 V. A 10-µF capacitor or larger must be connected between
this pin and ground. If not used, this pin must be left floating or tied to ground.
BIAS
12
I
DNC
EN
5
Do not connect. Leave this pin floating or connect this pin to ground.
Enable pin. Driving this pin to logic high enables the device; driving this pin to logic low disables the
device. If enable functionality is not required, this pin must be connected to IN or BIAS.
14
I
I
Feedback pin connected to the error amplifier. Although not required, a 10-nF feed-forward capacitor from
FB to OUT (as close to the device as possible) is recommended to maximize ac performance. The use of
a feed-forward capacitor can disrupt PG (power good) functionality.
FB
3
Ground pin. These pins must be connected to ground, the thermal pad, and each other with a low-
impedance connection.
GND
IN
8, 18
15-17
—
I
Input supply voltage pin. A 10-µF or larger ceramic capacitor (5 µF or greater of capacitance) from IN to
ground is recommended to reduce the impedance of the input supply. Place the input capacitor as close
to the input as possible.
2, 6, 7, 9,
10, 11
NC
No internal connection
Noise-reduction and soft-start pin. Connecting an external capacitor between this pin and ground reduces
reference voltage noise and also enables the soft-start function. Although not required, a 10-nF or larger
capacitor is recommended to be connected from NR/SS to GND (as close to the pin as possible) to
maximize ac performance.
NR/SS
OUT
13
—
O
Regulated output pin. A 47-µF or larger ceramic capacitor (25 µF or greater of capacitance) from OUT to
ground is required for stability and must be placed as close to the output as possible. Minimize the
impedance from the OUT pin to the load.
1, 19, 20
4
Active-high, power-good pin. An open-drain output indicates when the output voltage reaches VIT(PG) of
the target. The use of a feed-forward capacitor may disrupt PG (power good) functionality.
PG
O
Thermal pad
—
Connect the thermal pad to a large-area ground plane. The thermal pad is internally connected to GND.
Copyright © 2017–2018, Texas Instruments Incorporated
3
TPS7A53-Q1
ZHCSHB7B –SEPTEMBER 2017–REVISED JULY 2018
www.ti.com.cn
6 Specifications
6.1 Absolute Maximum Ratings
over junction temperature range (unless otherwise noted)(1)
MIN
–0.3
–0.3
–0.3
MAX
7.0
VIN + 0.3(2)
UNIT
IN, BIAS, PG, EN
Voltage
Current
OUT
V
NR/SS, FB
3.6
OUT
Internally limited
A
PG (sink current into device)
5
mA
°C
°C
Operating junction temperature, TJ
Storage temperature, Tstg
–55
–55
150
150
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) The absolute maximum rating is VIN + 0.3 V or 7.0 V, whichever is smaller.
6.2 ESD Ratings
VALUE
±2000
±500
UNIT
Human-body model (HBM), per AEC Q100-002((1)
Charged-device model (CDM), per AEC Q100-011
V(ESD)
Electrostatic discharge
V
(1) AEC Q100-002 indicates that HBM stressing shall be in accordance with the ANSI/ESDA/JEDEC JS-001 specification.
6.3 Recommended Operating Conditions
over junction temperature range (unless otherwise noted)
MIN
1.1
3.0
0
NOM
MAX
6.5
UNIT
VIN
Input supply voltage range(1)
Bias supply voltage range(1)
Enable voltage range
Output current
V
V
VBIAS
VEN
6.5
V
6.5
IOUT
CIN
0
3
A
Input capacitor
Output capacitor(2)
10
47
10
10
47
µF
µF
µF
kΩ
nF
nF
COUT
CBIAS
RPG
47 || 10 || 10
(3)
Bias capacitor
Power-good pullup resistance
NR/SS capacitor
100
CNR/SS
CFF
10
10
Feed-forward capacitor
Top resistor value in feedback network for
adjustable operation(4)
R1
12.1
160
kΩ
Bottom resistor value in feedback network for
adjustable operation(5)
R2
TJ
kΩ
Operating junction temperature
–40
150
°C
(1) BIAS supply is required when the VIN supply is below 1.4 V. Conversely, no BIAS supply is required when the VIN supply is higher than
or equal to 1.4 V. A BIAS supply helps improve dc and ac performance for VIN ≤ 2.2 V.
(2) The recommended output capacitors are selected to optimize PSRR for the frequency range of 400 kHz to 700 kHz. This frequency
range is a typical value for dc-dc supplies.
(3) If BIAS is used, a 10-µF capacitor is required. If BIAS is not used, a capacitor on the BIAS pin is not needed.
(4) The 12.1-kΩ resistor is selected to optimize PSRR and noise by matching the internal R1 value.
(5) The upper limit for the R2 resistor is to provide accuracy by making the current through the feedback network much larger than the
leakage current into the feedback node.
4
Copyright © 2017–2018, Texas Instruments Incorporated
TPS7A53-Q1
www.ti.com.cn
ZHCSHB7B –SEPTEMBER 2017–REVISED JULY 2018
6.4 Thermal Information
TPS7A53-Q1
THERMAL METRIC(1)
RGR (VQFN)
20 PINS
43.4
RTK (VQFNP)
20 PINS
39.9
UNIT
RθJA
Junction-to-ambient thermal resistance
Junction-to-case (top) thermal resistance
Junction-to-board thermal resistance
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
RθJC(top)
RθJB
36.8
32.1
17.6
16.9
ψJT
Junction-to-top characterization parameter
Junction-to-board characterization parameter
Junction-to-case (bottom) thermal resistance
0.8
0.4
ψJB
17.6
16.9
RθJC(bot)
3.4
1.6
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
6.5 Electrical Characteristics
over operating junction temperature range (TJ = –40°C to +150°C), VIN = 1.4 V or VIN = VOUT(nom) + 0.4 V (whichever is
greater), VBIAS = open, VOUT(nom) = 0.8 V(1), OUT connected to 50 Ω to GND(2), VEN = 1.1 V, CIN = 10 µF, COUT = 47 µF, CNR/SS
= CFF = open, and PG pin pulled up to VIN with 100 kΩ (unless otherwise noted); typical values are at TJ = 25°C
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
1.09
1.39
2.9
UNIT
VFB
Feedback voltage
0.8
V
VNR/SS
NR/SS pin voltage
0.8
V
VUVLO1+(IN)
VHYS1(IN)
VUVLO1-(IN)
VUVLO2+(IN)
VHYS2(IN)
VUVLO2-(IN)
VUVLO+(BIAS)
VUVLO-(BIAS)
VHYS(BIAS)
Rising input supply UVLO with BIAS
VUVLO1(IN) hysteresis
VIN rising with VBIAS = 3.0 V
1.02
320
V
VBIAS = 3.0 V
mV
V
Falling input supply UVLO with BIAS
VIN falling with VBIAS = 3.0 V
0.55
0.711
1.31
253
Rising input supply UVLO without BIAS VIN rising
VUVLO2(IN) hysteresis
V
mV
V
Falling input supply UVLO without BIAS VIN falling
0.65
2.45
1.064
2.83
2.531
290
Rising bias supply UVLO
Falling bias supply UVLO
VUVLO(BIAS) hysteresis
VBIAS rising, VIN = 1.1 V
V
VBIAS falling, VIN = 1.1 V
VIN = 1.1 V
Using external resistors(3)
V
mV
V
Range
0.8
5.15
1%
0.8 V ≤ VOUT ≤ 5.15 V, 5 mA ≤ IOUT ≤ 3 A, over
VIN, –40℃ < TJ < 150℃
Accuracy
–2%
Accuracy with
BIAS
VIN = 1.1 V, 5 mA ≤ IOUT ≤ 3 A,3.0 V ≤ VBIAS
6.5 V, –40℃ < TJ < 150℃
≤
–1.75%
–1%
0.75%
1%
VOUT
Output voltage
Accuracy
0.8 V ≤ VOUT ≤ 5.15 V, 5 mA ≤ IOUT ≤ 3 A, over
VIN, –40℃ < TJ < 125℃
Accuracy with
BIAS
VIN = 1.1 V, 5 mA ≤ IOUT ≤ 3 A,
3.0 V ≤ VBIAS ≤ 6.5 V, –40℃ < TJ < 125℃
–0.75%
0.75%
ΔVOUT/ ΔVIN
Line regulation
IOUT = 5 mA, 1.4 V ≤ VIN ≤ 6.5 V
0.0035
0.07
mV/V
mV/A
5 mA ≤ IOUT ≤ 3 A, 3.0 V ≤ VBIAS ≤ 6.5 V,
VIN = 1.1 V
ΔVOUT/ ΔIOUT Load regulation
5 mA ≤ IOUT ≤ 3 A
0.08
0.04
5 mA ≤ IOUT ≤ 3 A, VOUT = 5.0 V
(1) VOUT(nom) is the expected VOUT value set by the external feedback resistors.
(2) This 50-Ω load is disconnected when the test conditions specify an IOUT value.
(3) When the device is connected to external feedback resistors at the FB pin, external resistor tolerances are not included.
Copyright © 2017–2018, Texas Instruments Incorporated
5
TPS7A53-Q1
ZHCSHB7B –SEPTEMBER 2017–REVISED JULY 2018
www.ti.com.cn
Electrical Characteristics (continued)
over operating junction temperature range (TJ = –40°C to +150°C), VIN = 1.4 V or VIN = VOUT(nom) + 0.4 V (whichever is
greater), VBIAS = open, VOUT(nom) = 0.8 V(1), OUT connected to 50 Ω to GND(2), VEN = 1.1 V, CIN = 10 µF, COUT = 47 µF, CNR/SS
= CFF = open, and PG pin pulled up to VIN with 100 kΩ (unless otherwise noted); typical values are at TJ = 25°C
PARAMETER
TEST CONDITIONS
MIN
TYP
157
215
255
MAX
285
370
475
UNIT
VIN = 1.4 V, IOUT = 3 A, VFB = 0.8 V – 3%
VIN = 5.4 V, IOUT = 3 A, VFB = 0.8 V – 3%
VIN = 5.6 V, IOUT = 3 A, VFB = 0.8 V – 3%
RGR package
RTK package
VIN = 1.1 V, 3.0 V ≤ VBIAS ≤ 6.5 V,
IOUT = 3 A, VFB = 0.8 V – 3%
110
195
VDO
Dropout voltage
mV
VIN = 1.4 V, IOUT = 3 A, VFB = 0.8 V – 3%
VIN = 5.4 V, IOUT = 3 A, VFB = 0.8 V – 3%
VIN = 5.6 V, IOUT = 3 A, VFB = 0.8 V – 3%
170
241
291
310
415
515
VIN = 1.1 V, 3.0 V ≤ VBIAS ≤ 6.5 V,
IOUT = 3 A, VFB = 0.8 V – 3%
126
4.2
220
4.9
VOUT forced at 0.9 × VOUT(nom)
,
ILIM
ISC
Output current limit
3.55
–0.5
A
A
VIN = VOUT(nom) + 0.4 V
Short-circuit current limit
GND pin current
RLOAD = 20 mΩ
1.0
3
VIN = 6.5 V, IOUT = 5 mA
VIN = 1.4 V, IOUT = 3 A
4
5.5
25
mA
IGND
4.3
Shutdown, PG = open, VIN = 6.5 V, VEN = 0.5 V
VIN = 6.5 V, VEN = 0 V and 6.5 V
µA
µA
IEN
EN pin current
0.5
VIN = 1.1 V, VBIAS = 6.5 V,
VOUT(nom) = 0.8 V, IOUT = 3 A
IBIAS
BIAS pin current
2.4
3.5
0.5
mA
V
EN pin low-level input voltage
(disable device)
VIL(EN)
VIH(EN)
EN pin high-level input voltage
(enable device)
1.1
V
VIT-(PG)
VHYS(PG)
VIT+(PG)
PG pin threshold
PG pin hysteresis
PG pin threshold
For falling VOUT
For rising VOUT
0.82VOUT
0.88VOUT
0.02VOUT
0.90VOUT
0.93VOUT
V
V
V
0.84VOUT
0.95VOUT
0.4
VOUT < VIT(PG), IPG = –1 mA
(current into device)
VOL(PG)
PG pin low-level output voltage
V
Ilkg(PG)
INR/SS
IFB
PG pin leakage current
NR/SS pin charging current
FB pin leakage current
VOUT > VIT(PG), VPG = 6.5 V
VNR/SS = GND, VIN = 6.5 V
VIN = 6.5 V
1
10
µA
µA
nA
4.0
6.5
–100
100
f = 10 kHz,
VOUT = 0.8 V,
VBIAS = 5.0 V
42
39
f = 500 kHz,
VOUT = 0.8 V,
VBIAS = 5.0 V
VIN – VO UT = 0.4 V,
IOUT = 3 A, CNR/SS = 100 nF,
PSRR
Power-supply ripple rejection
dB
CFF = 10 nF, COUT
=
47 µF || 10 µF || 10 µF
f = 10 kHz,
VOUT = 5.0 V
40
25
f = 500 kHz,
VOUT = 5.0 V
BW = 10 Hz to 100 kHz, VIN = 1.1 V,
VOUT = 0.8 V, VBIAS = 5.0 V, IOUT = 3 A,
CNR/SS = 100 nF, CFF = 10 nF,
4.4
COUT = 47 µF || 10 µF || 10 µF
Vn
Output noise voltage
µVRMS
BW = 10 Hz to 100 kHz,
VOUT = 5.0 V, IOUT = 3 A, CNR/SS = 100 nF,
CFF = 10 nF, COUT = 47 µF || 10 µF || 10 µF
7.7
Shutdown, temperature increasing
Reset, temperature decreasing
160
140
TSD
Thermal shutdown temperature
°C
6
Copyright © 2017–2018, Texas Instruments Incorporated
TPS7A53-Q1
www.ti.com.cn
ZHCSHB7B –SEPTEMBER 2017–REVISED JULY 2018
6.6 Typical Characteristics
at TA = 25°C, VIN = 1.4 V or VIN = VOUT(NOM) + 0.4 V (whichever is greater), VBIAS = open, VOUT(NOM) = 0.8 V, VEN = 1.1 V, COUT
= 47 µF, CNR/SS = 0 nF, CFF = 0 nF, and PG pin pulled up to VIN with 100 kΩ (unless otherwise noted)
100
80
60
40
20
0
100
80
60
40
20
0
IOUT = 0.1 A
IOUT = 0.5 A
IOUT = 1.0 A
IOUT = 2.0 A
IOUT = 2.5 A
IOUT = 3.0 A
VIN = 1.10 V
VIN = 1.15 V
VIN = 1.20 V
VIN = 1.25 V
VIN = 1.30 V
VIN = 1.35 V
VIN = 1.40 V
1x101
1x102
1x103
1x104
1x105
1x106
1x107
1x101
1x102
1x103
1x104
1x105
1x106
1x107
Frequency (Hz)
Frequency (Hz)
VIN = 1.1 V, VBIAS = 5 V,
IOUT = 3 A, VBIAS = 5 V,
COUT = 47 µF || 10 µF || 10 µF, CNR/SS = 10 nF, CFF = 10 nF
COUT = 47 µF || 10 µF || 10 µF, CNR/SS = 10 nF, CFF = 10 nF
图 1. PSRR vs Frequency and IOUT
图 2. PSRR vs Frequency and VIN With Bias
100
100
VBIAS = 0 V
VBIAS = 3.0 V
VBIAS = 5.0 V
VBIAS = 6.5 V
80
80
60
40
60
40
20
0
VIN = 1.1 V, VBIAS = 5 V
VIN = 1.2 V, VBIAS = 5 V
VIN = 1.4 V, VBIAS = 0 V
20
VIN = 2.5 V, VBIAS = 0 V
VIN = 5.0 V, VBIAS = 0 V
0
1x101
1x102
1x103
1x104
1x105
1x106
1x107
1x101
1x102
1x103
1x104
1x105
1x106
1x107
Frequency (Hz)
Frequency (Hz)
VIN = 1.4 V, IOUT = 1 A,
IOUT = 1 A,
COUT = 47 µF || 10 µF || 10 µF, CNR/SS = 10 nF, CFF = 10 nF
COUT = 47 µF || 10 µF || 10 µF, CNR/SS = 10 nF, CFF = 10 nF
图 3. PSRR vs Frequency and VBIAS
图 4. PSRR vs Frequency and VIN
100
100
VOUT = 0.8 V
VOUT = 0.9 V
VIN = 3.60 V
VIN = 3.65 V
VOUT = 1.1 V
VIN = 3.70 V
80
80
VOUT = 1.2 V
VOUT = 1.5 V
VOUT = 1.8 V
VIN = 3.75 V
VIN = 3.80 V
VIN = 3.85 V
60
60
VOUT = 2.5 V
VIN = 3.90 V
40
20
0
40
20
0
1x101
1x102
1x103
1x104
1x105
1x106
1x107
1x101
1x102
1x103
1x104
1x105
1x106
1x107
Frequency (Hz)
Frequency (Hz)
VIN = VOUT + 0.3 V, VBIAS = 5.0 V, IOUT = 3 A,
COUT = 47 µF || 10 µF || 10 µF, CNR/SS = 10 nF, CFF = 10 nF
IOUT = 3 A, COUT = 47 µF || 10 µF || 10 µF, CNR/SS = 10 nF,
CFF = 10 nF
图 5. PSRR vs Frequency and VOUT With Bias
图 6. PSRR vs Frequency and VIN for VOUT = 3.3 V
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7
TPS7A53-Q1
ZHCSHB7B –SEPTEMBER 2017–REVISED JULY 2018
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Typical Characteristics (接下页)
at TA = 25°C, VIN = 1.4 V or VIN = VOUT(NOM) + 0.4 V (whichever is greater), VBIAS = open, VOUT(NOM) = 0.8 V, VEN = 1.1 V, COUT
= 47 µF, CNR/SS = 0 nF, CFF = 0 nF, and PG pin pulled up to VIN with 100 kΩ (unless otherwise noted)
100
80
60
40
20
0
100
80
60
40
20
0
COUT = 47||10||10 mF
COUT = 47 mF
COUT = 100 mF
COUT = 200 mF
COUT = 500 mF
VBIAS = 3.0 V
VBIAS = 5.0 V
VBIAS = 6.5 V
1x101
1x102
1x103
1x104
1x105
1x106
1x107
1x101
1x102
1x103
1x104
1x105
1x106
1x107
Frequency (Hz)
Frequency (Hz)
VIN = VOUT + 0.3 V, VOUT = 1 V, IOUT = 3 A, CNR/SS = 10 nF,
CFF = 10 nF
VIN = VOUT + 0.3 V, VOUT = 1 V, IOUT = 3 A,
COUT = 47 µF || 10 µF || 10 µF, CNR/SS = 10 nF, CFF = 10 nF
图 7. PSRR vs Frequency and COUT
图 8. VBIAS PSRR vs Frequency and VBIAS
12
2
IOUT = 1.0 A
IOUT = 2.0 A
IOUT = 3.0 A
VOUT = 5.0 V, 11.7 mVRMS
1
VOUT = 3.3 V, 8.3 mVRMS
11
VOUT = 1.5 V, 5.4 mVRMS
VOUT = 0.8 V, 4.5 mVRMS
0.5
10
0.2
0.1
9
8
7
6
5
4
0.05
0.02
0.01
0.005
0.002
0.001
0.6
1.2
1.8
2.4
3
3.6
4.2
4.8
5.4
1x101
1x102
1x103
1x104
1x105
1x106 5x106
Output Voltage (V)
Frequency (Hz)
VIN = VOUT + 0.3 V and VBIAS = 5 V for VOUT ≤ 2.2 V,
COUT = 47 µF || 10 µF || 10 µF, CNR/SS = 10 nF, CFF = 10 nF,
RMS noise BW = 10 Hz to 100 kHz
VIN = VOUT + 0.3 V and VBIAS = 5 V for VOUT ≤ 2.2 V, IOUT = 3 A,
COUT = 47 µF || 10 µF || 10 µF, CNR/SS = 10 nF, CFF = 10 nF,
RMS noise BW = 10 Hz to 100 kHz
图 10. Output Noise vs Frequency and VOUT
图 9. Output Voltage Noise vs Output Voltage
2
2
VIN = 1.4 V, VBIAS = 5.0 V, 4.5 mVRMS
VIN = 1.4 V, 6.0 mVRMS
CNR/SS = 0 nF, 6.2 mVRMS
CNR/SS = 1 nF, 4.9 mVRMS
1
1
VIN = 1.5 V, 4.5 mVRMS
VIN = 1.8 V, 4.5 mVRMS
VIN = 2.5 V, 4.6 mVRMS
VIN = 5.0 V, 5.15 mVRMS
CNR/SS = 10 nF, 4.4 mVRMS
CNR/SS = 100 nF, 4.35 mVRMS
0.5
0.5
0.2
0.1
0.2
0.1
0.05
0.05
0.02
0.01
0.02
0.01
0.005
0.005
0.002
0.001
0.002
0.001
1x101
1x102
1x103
1x104
1x105
1x106 4x106
1x101
1x102
1x103
1x104
1x105
1x106 4x106
Frequency (Hz)
Frequency (Hz)
IOUT = 3 A, COUT = 47 µF || 10 µF || 10 µF, CNR/SS = 10 nF,
CFF = 10 nF, RMS noise BW = 10 Hz to 100 kHz
VIN = VOUT + 0.3 V, VBIAS = 5 V, IOUT = 3 A, COUT = 47 µF ||
10 µF || 10 µF, CFF = 10 nF, RMS noise BW = 10 Hz to 100 kHz
图 11. Output Noise vs Frequency and VIN
图 12. Output Noise vs Frequency and CNR/SS
8
版权 © 2017–2018, Texas Instruments Incorporated
TPS7A53-Q1
www.ti.com.cn
ZHCSHB7B –SEPTEMBER 2017–REVISED JULY 2018
Typical Characteristics (接下页)
at TA = 25°C, VIN = 1.4 V or VIN = VOUT(NOM) + 0.4 V (whichever is greater), VBIAS = open, VOUT(NOM) = 0.8 V, VEN = 1.1 V, COUT
= 47 µF, CNR/SS = 0 nF, CFF = 0 nF, and PG pin pulled up to VIN with 100 kΩ (unless otherwise noted)
2
2
CFF = 0 nF, 6.2 mVRMS
CFF = 0.1 nF, 5.8 mVRMS
CFF = 1 nF, 4.9 mVRMS
CFF = 10 nF, 4.4 mVRMS
CFF = 100 nF, 4.35 mVRMS
CNR/SS = 10 nF, 11.7 mVRMS
CNR/SS = 100 nF, 7.7 mVRMS
CFF = CNR/SS = 100 nF, 6.0 mVRMS
1
1
0.5
0.5
0.2
0.1
0.2
0.1
0.05
0.05
0.02
0.01
0.02
0.01
0.005
0.005
0.002
0.001
0.002
0.001
1x101
1x102
1x103
1x104
1x105
1x106 4x106
1x101
1x102
1x103
1x104
1x105
1x106 4x106
Frequency (Hz)
Frequency (Hz)
VIN = VOUT + 0.3 V, VBIAS = 5 V, IOUT = 3 A, sequencing with a dc-
dc converter and PG, COUT = 47 µF || 10 µF || 10 µF,
CNR/SS = 10 nF, RMS noise BW = 10 Hz to 100 kHz
IOUT = 3 A, COUT = 47 µF || 10 µF || 10 µF, CFF = 10 nF,
RMS noise BW = 10 Hz to 100 kHz
图 13. Output Noise vs Frequency and CFF
图 14. Output Noise at 5.0-V Output
1.2
10
9
8
7
6
5
4
3
2
1
0
50
Output Current
VOUT = 0.9 V
VOUT = 1.1 V
VOUT = 1.2 V
VOUT = 1.8 V
40
1
0.8
0.6
0.4
30
20
10
0
-10
-20
-30
-40
-50
VEN
0.2
0
VOUT, CNR/SS = 0 nF
VOUT, CNR/SS = 10 nF
VOUT, CNR/SS = 47 nF
VOUT, CNR/SS = 100 nF
-0.2
0
5
10
15
20
25
30
35
40
45
50
0
0.25
0.5
0.75
1
1.25
1.5
1.75
Time (ms)
Time (ms)
VIN = 1.2 V, VOUT = 0.9 V, VBIAS = 5.0 V, IOUT = 3 A,
COUT = 47 µF || 10 µF || 10 µF, CFF = 10 nF
VIN = VOUT + 0.3 V, VBIAS = 5 V, IOUT, DC = 100 mA, slew rate =
1 A/µs, CNR/SS = CFF = 10 nF, COUT = 47 µF || 10 µF || 10 µF
图 16. Load Transient vs Time and VOUT With Bias
图 15. Start-Up Waveform vs Time and CNR/SS
10
9
8
7
6
5
4
3
2
1
0
50
40
50
Output Current
VOUT = 0.9 V
VOUT = 1.1 V
VOUT, 0.5 A/ms
VOUT, 1 A/ms
VOUT, 2 A/ms
30
25
0
20
10
0
-10
-20
-30
-40
-50
-25
-50
0
0.2 0.4 0.6 0.8
1
1.2 1.4 1.6 1.8
2
0
0.4
0.8
1.2
1.6
2
Time (ms)
Time (ms)
IOUT, DC = 100 mA, COUT = 47 µF || 10 µF || 10 µF,
CNR/SS = CFF = 10 nF, slew rate = 1 A/µs
VOUT = 5 V, IOUT, DC = 100 mA, IOUT = 100 mA to 3 A,
COUT = 47 µF || 10 µF || 10 µF, CNR/SS = CFF = 10 nF
图 17. Load Transient vs Time and VOUT Without Bias
图 18. Load Transient vs Time and Slew Rate
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TPS7A53-Q1
ZHCSHB7B –SEPTEMBER 2017–REVISED JULY 2018
www.ti.com.cn
Typical Characteristics (接下页)
at TA = 25°C, VIN = 1.4 V or VIN = VOUT(NOM) + 0.4 V (whichever is greater), VBIAS = open, VOUT(NOM) = 0.8 V, VEN = 1.1 V, COUT
= 47 µF, CNR/SS = 0 nF, CFF = 0 nF, and PG pin pulled up to VIN with 100 kΩ (unless otherwise noted)
500
450
400
350
300
250
200
150
100
50
60
40
20
0
-40èC
0èC
25èC
85èC
125èC
150èC
VOUT, 100 mA to 3 A
VOUT, 500 mA to 3 A
-20
-40
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
0
25
50
75
Time (ms)
100
125
150
Input Voltage (V)
IOUT = 3 A, VBIAS = 0 V
VIN = 1.2 V, VBIAS = 5.0 V, COUT = 47 µF || 10 µF || 10 µF,
CNR/SS = CFF = 10 nF, slew rate = 1 A/µs
图 19. Load Transient vs Time and DC Load
图 20. Dropout Voltage vs Input Voltage Without Bias
(VOUT = 0.9 V)
500
300
250
200
150
100
50
-40èC
0èC
25èC
85èC
125èC
150èC
-40èC
0èC
25èC
85èC
125èC
150èC
450
400
350
300
250
200
150
100
50
0
0
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
0
0.5
1
1.5
2
2.5
3
Input Voltage (V)
Output Current (A)
IOUT = 3 A, VBIAS = 6.5 V
图 21. Dropout Voltage vs Input Voltage With Bias
VIN = 1.4 V, VBIAS = 0 V
图 22. Dropout Voltage vs Output Current Without Bias
300
250
200
150
100
50
300
250
200
150
100
50
-40èC
0èC
25èC
85èC
125èC
150èC
-40èC
0èC
25èC
85èC
125èC
150èC
0
0
0
0.5
1
1.5
2
2.5
3
0
0.5
1
1.5
2
2.5
3
Output Current (A)
Output Current (A)
VIN = 1.1 V, VBIAS = 3 V
VIN = 5.5 V
图 23. Dropout Voltage vs Output Current With Bias
图 24. Dropout Voltage vs Output Current (High VIN)
10
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TPS7A53-Q1
www.ti.com.cn
ZHCSHB7B –SEPTEMBER 2017–REVISED JULY 2018
Typical Characteristics (接下页)
at TA = 25°C, VIN = 1.4 V or VIN = VOUT(NOM) + 0.4 V (whichever is greater), VBIAS = open, VOUT(NOM) = 0.8 V, VEN = 1.1 V, COUT
= 47 µF, CNR/SS = 0 nF, CFF = 0 nF, and PG pin pulled up to VIN with 100 kΩ (unless otherwise noted)
1.5
1.2
0.9
0.6
0.3
0
1
0.8
0.6
0.4
0.2
0
-40èC
0èC
25èC
85èC
125èC
150èC
-40èC
0èC
25èC
85èC
125èC
150èC
-0.3
-0.6
-0.9
-1.2
-1.5
-0.2
-0.4
-0.6
-0.8
-1
0
0.5
1
1.5
2
2.5
3
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
Output Current (A)
Input Voltage (V)
VIN = 1.4 V, VBIAS = 0 V
VOUT = 0.8 V, VBIAS = 0 V, IOUT = 5 mA
图 25. Load Regulation With Bias
图 26. Line Regulation Without Bias
4
4
-40èC
0èC
25èC
85èC
125èC
150èC
-40èC
0èC
25èC
85èC
125èC
150èC
3.75
3.5
3.25
3
3.75
3.5
3.25
3
2.75
2.5
2.25
2
2.75
2.5
2.25
2
1
2
3
4
5
6
7
3
3.5
4
4.5
5
5.5
6
6.5
7
Input Voltage (V)
Bias Voltage (V)
VBIAS = 0 V, IOUT = 5 mA
VIN = 1.1 V, IOUT = 5 mA
图 27. Quiescent Current vs Input Voltage
图 28. Quiescent Current vs Bias Voltage
8
7
6
5
4
3
2
1
8
7
6
5
4
3
2
1
-40èC
0èC
25èC
85èC
125èC
150èC
-40èC
0èC
25èC
85èC
125èC
150èC
0
0
0
3
1
2
3
4
5
6
7
3.5
4
4.5
5
5.5
6
6.5
7
Input Voltage (V)
Bias Voltage (V)
VBIAS = 0 V
VIN = 1.1 V
图 29. Shutdown Current vs Input Voltage
图 30. Shutdown Current vs Bias Voltage
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11
TPS7A53-Q1
ZHCSHB7B –SEPTEMBER 2017–REVISED JULY 2018
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Typical Characteristics (接下页)
at TA = 25°C, VIN = 1.4 V or VIN = VOUT(NOM) + 0.4 V (whichever is greater), VBIAS = open, VOUT(NOM) = 0.8 V, VEN = 1.1 V, COUT
= 47 µF, CNR/SS = 0 nF, CFF = 0 nF, and PG pin pulled up to VIN with 100 kΩ (unless otherwise noted)
9
8.5
8
1.5
1.25
1
7.5
7
0.75
0.5
0.25
0
6.5
6
VUVLO2(IN) Rising
VUVLO2(IN) Falling
VUVLO1(IN) Rising
VUVLO1(IN) Falling
5.5
5
-50
-25
0
25
50
75
100
125
150
150
3
-50
-25
0
25
50
75
100
125
150
150
3
Temperature (èC)
Temperature (èC)
VBIAS = 0 V
图 31. NR/SS Current vs Temperature
图 32. VIN UVLO vs Temperature
VIL(EN) VIH(EN)
3
2.9
2.8
2.7
2.6
2.5
2.4
2.3
2.2
1.1
1
0.9
0.8
0.7
0.6
0.5
0.4
VUVLO(BIAS) Rising
VUVLO(BIAS) Falling
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
Temperature (èC)
Temperature (èC)
VIN = 1.1 V
VIN = 1.4 V, 6.5 V
图 33. VBIAS UVLO vs Temperature
图 34. Enable Threshold vs Temperature
600
500
400
300
200
100
0
600
500
400
300
200
100
0
Temperature
Temperature
-40èC
0èC
25èC
85èC
125èC
150èC
-40èC
0èC
25èC
85èC
125èC
150èC
0
0.5
1
1.5
PG Current (mA)
2
2.5
0
0.5
1
1.5
2
2.5
PG Current (mA)
VIN = 6.5 V
图 35. PG Voltage vs PG Current Sink
图 36. PG Voltage vs PG Current Sink
12
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TPS7A53-Q1
www.ti.com.cn
ZHCSHB7B –SEPTEMBER 2017–REVISED JULY 2018
Typical Characteristics (接下页)
at TA = 25°C, VIN = 1.4 V or VIN = VOUT(NOM) + 0.4 V (whichever is greater), VBIAS = open, VOUT(NOM) = 0.8 V, VEN = 1.1 V, COUT
= 47 µF, CNR/SS = 0 nF, CFF = 0 nF, and PG pin pulled up to VIN with 100 kΩ (unless otherwise noted)
93
92
91
90
89
88
87
86
4.75
4.25
3.75
3.25
2.75
2.25
1.75
PG Falling
PG Rising
Temperature
25èC
-40èC
0èC
125èC
85èC
-50
-25
0
25
50
75
100
125
150
0
100
200
300
400
500
600
700
Temperature (èC)
Output Voltage (mV)
Temperature limited because of power dissipation
图 37. PG Threshold vs Temperature
图 38. Foldback Current Limit vs Output Voltage
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TPS7A53-Q1
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7 Detailed Description
7.1 Overview
The TPS7A53-Q1 is a high-current (3 A), low-noise (4.4 µVRMS), high-accuracy (1%), low-dropout linear voltage
regulator with an input range of 1.1 V to 6.5 V and an output voltage range of 0.8 V to 5.15 V. The TPS7A53-Q1
has an integrated charge pump for ease of use, and an external bias rail to allow for the lowest dropout across
the entire output voltage range. 表 1 categorizes the functions shown in the Functional Block Diagram. These
features make the TPS7A53-Q1 a robust solution to solve many challenging problems by generating a clean,
accurate power supply in a variety of applications.
表 1. Device Features
VOLTAGE REGULATION
SYSTEM START-UP
INTERNAL PROTECTION
High accuracy
Programmable soft start
Foldback current limit
No sequencing requirement between BIAS,
IN, and EN
Low-noise, high-PSRR output
Fast transient response
Thermal shutdown
Power-good output
Start-up with negative bias on OUT
7.2 Functional Block Diagram
PSRR
Boost
Current
Limit
IN
OUT
Charge
Pump
BIAS
Active
RNR/SS = 250 kW
Discharge
0.8-V
VREF
+
Error
Amp
œ
INR/SS
NR/SS
200 pF
FB
Internal
Controller
UVLO
Circuits
Thermal
Shutdown
PG
œ
0.88 x VREF
+
EN
GND
14
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TPS7A53-Q1
www.ti.com.cn
ZHCSHB7B –SEPTEMBER 2017–REVISED JULY 2018
7.3 Feature Description
7.3.1 Voltage Regulation Features
7.3.1.1 DC Regulation
An LDO, as shown in 图 39, functions as a class-B amplifier in which the input signal is the internal reference
voltage (VREF). VREF is designed to have a very low bandwidth at the input to the error amplifier through the use
of a low-pass filter (VNR/SS).
As such, the reference can be considered as a pure dc input signal. The low output impedance of an LDO comes
from the combination of the output capacitor and pass element. The pass element also presents a high input
impedance to the source voltage when operating as a current source. A positive LDO can only source current
because of the class-B architecture.
This device achieves a maximum of 1% output voltage accuracy primarily because of the high-precision band-
gap voltage (VBG) that creates VREF. The low dropout voltage (VDO) reduces the thermal power dissipation
required by the device to regulate the output voltage at a given current level, thereby improving system
efficiency. These features combine to make this device a good approximation of an ideal voltage source.
VIN
To Load
R1
VREF
R2
GND
NOTE: VOUT = VREF × (1 + R1 / R2).
图 39. Simplified Regulation Circuit
7.3.1.2 AC and Transient Response
The LDO responds quickly to a transient (large-signal response) on the input supply (line transient) or the output
current (load transient) resulting from the LDO high-input impedance and low output-impedance across
frequency. This same capability also means that the LDO has a high power-supply rejection ratio (PSRR) and,
when coupled with a low internal noise-floor (Vn), the LDO approximates an ideal power supply in ac (small-
signal) and large-signal conditions.
The choice of external component values optimizes the small- and large-signal response. The NR/SS capacitor
(CNR/SS) and feed-forward capacitor (CFF) easily reduce the device noise floor and improve PSRR.
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TPS7A53-Q1
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www.ti.com.cn
Feature Description (接下页)
7.3.2 System Start-Up Features
In many different applications, the power-supply output must turn on within a specific window of time to either
provide proper operation of the load or to minimize the loading on the input supply or other sequencing
requirements. The LDO start-up is well-controlled and user-adjustable, solving the demanding requirements
faced by many power-supply design engineers in a simple fashion.
7.3.2.1 Programmable Soft Start (NR/SS Pin)
Soft start directly controls the output start-up time and indirectly controls the output current during start-up (inrush
current).
The external capacitor at the NR/SS pin (CNR/SS), as shown in 图 40, sets the output start-up time by setting the
rise time of the internal reference (VNR/SS).
SW
INR/SS
RNR
VREF
+
CNR/SS
GND
œ
VFB
图 40. Simplified Soft-Start Circuit
7.3.2.2 Internal Sequencing
Controlling when a single power supply turns on can be difficult in a power distribution network (PDN) because of
the high power levels inherent in a PDN, and the variations between all of the supplies. As shown in 图 41 and 表
2, the LDO turnon and turnoff time is set by the enable circuit (EN) and undervoltage lockout circuits (UVLO1,2(IN)
and UVLOBIAS).
EN
Internal Enable
UVLOBIAS
Control
UVLO1,2(IN)
图 41. Simplified Turnon Control
表 2. Internal Sequencing Functionality Table
ENABLE
STATUS
LDO
STATUS
ACTIVE
DISCHARGE
POWER
GOOD
INPUT VOLTAGE
BIAS VOLTAGE
PG = 1 when
EN = 1
EN = 0
On
Off
On
VOUT ≥ VIT(PG)
VBIAS ≥ VUVLO(BIAS)
VIN ≥ VUVLO_1,2(IN)
Off
Off
Off
Off
VBIAS < VUVLO(BIAS) +VHYS(BIAS)
BIAS = don't care
PG = 0
(1)
VIN < VUVLO_1,2(IN) – VHYS1,2(IN)
IN = don't care
EN = don't care
On
VBIAS ≥ VUVLO(BIAS)
(1) The active discharge remains on as long as VIN or VBIAS provide enough headroom for the discharge circuit to function.
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7.3.2.2.1 Enable (EN)
The enable signal (VEN) is an active-high digital control that enables the LDO when the enable voltage is past the
rising threshold (VEN ≥ VIH(EN)) and disables the LDO when the enable voltage is below the falling threshold (VEN
≤ VIL(EN)). The exact enable threshold is between VIH(EN) and VIL(EN) because EN is a digital control. Connect EN
to VIN if enable functionality is not desired.
7.3.2.2.2 Undervoltage Lockout (UVLO) Control
The UVLO circuits respond quickly to glitches on IN or BIAS and attempt to disable the output of the device if
either of these rails collapse.
7.3.2.2.3 Active Discharge
When either EN or UVLO are low, the device connects a resistor of several hundred ohms from VOUT to GND,
discharging the output capacitance.
Do not rely on the active discharge circuit for discharging large output capacitors when the input voltage drops
below the targeted output voltage. Current flows from the output to the input (reverse current) when VOUT > VIN,
which can cause damage to the device (when VOUT > VIN + 0.3 V).
7.3.2.3 Power-Good Output (PG)
The PG signal provides an easy solution to meet demanding sequencing requirements because PG signals
when the output nears its nominal value. PG can be used to signal other devices in a system when the output
voltage is near, at, or above the set output voltage (VOUT(nom)). 图 42 shows a simplified schematic.
The PG signal is an open-drain digital output that requires a pullup resistor to a voltage source and is active high.
The PG circuit sets the PG pin into a high-impedance state to indicate that the power is good.
Using a large feed-forward capacitor (CFF) delays the output voltage and, because the PG circuit monitors the FB
pin, the PG signal can indicate a false positive.
VPG
VBG
VIN
œ
+
VFB
GND
GND
UVLOBIAS
UVLOIN
EN
GND
图 42. Simplified PG Circuit
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7.3.3 Internal Protection Features
In many applications, fault events can occur that damage devices in the system. Short circuits and excessive
heat are the most common fault events for power supplies. The TPS7A53-Q1 implements circuitry to protect the
device and its load during these events. Continuously operating in these fault conditions or above a junction
temperature of 140°C is not recommended because the long-term reliability of the device is reduced.
7.3.3.1 Foldback Current Limit (ICL
)
The internal current limit circuit is used to protect the LDO against high load-current faults or shorting events.
During a current-limit event, the LDO sources constant current; therefore, the output voltage falls with decreased
load impedance. Thermal shutdown can activate during a current limit event because of the high power
dissipation typically found in these conditions. For proper operation of the current limit, minimize the inductances
to the input and load. Continuous operation in current limit is not recommended.
7.3.3.2 Thermal Protection (Tsd)
The thermal shutdown circuit protects the LDO against excessive heat in the system, either resulting from current
limit or high ambient temperature.
The output of the LDO turns off when the LDO temperature (junction temperature, TJ) exceeds the rising thermal
shutdown temperature. The output turns on again after TJ decreases below the falling thermal shutdown
temperature.
A high power dissipation across the device, combined with a high ambient temperature (TA), can cause TJ to be
greater than or equal to Tsd, triggering the thermal shutdown and causing the output to fall to 0 V. The LDO can
cycle on and off when thermal shutdown is reached under these conditions.
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7.4 Device Functional Modes
表 3 provides a quick comparison between the regulation and disabled operation.
表 3. Device Functional Modes Comparison
PARAMETER
EN
OPERATING
MODE
VIN
VBIAS
IOUT
IOUT < ICL
—
TJ
(2)
Regulation(1)
Disabled(3)
VIN > VOUT(nom) + VDO
VIN < VUVLO_1,2(IN)
V
BIAS ≥ VUVLO(BIAS)
VEN > VIH(EN)
VEN < VIL(EN)
TJ ≤ TJ(maximum)
TJ > Tsd
VBIAS < VUVLO(BIAS)
(1) All table conditions must be met.
(2) VBIAS is only required for VIN < 1.4 V.
(3) The device is disabled when any condition is met.
7.4.1 Regulation
The device regulates the output to the nominal output voltage when all the conditions in 表 3 are met.
7.4.2 Disabled
When disabled, the pass device is turned off, the internal circuits are shut down, and the output voltage is
actively discharged to ground by an internal resistor from the output to ground. See the Active Discharge section
for additional information.
7.4.3 Current Limit Operation
During a current-limit event, the LDO regulates the output current instead of the output voltage; therefore, the
output voltage falls with decreased load impedance.
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8 Application and Implementation
注
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
Successfully implementing an LDO in an application depends on the application requirements. This section
discusses key device features and how to best implement them to achieve a reliable design.
8.1.1 Recommended Capacitor Types
The TPS7A53-Q1 is designed to be stable using low equivalent series resistance (ESR) ceramic capacitors at
the input, output, and noise-reduction pin (NR, pin 13). Multilayer ceramic capacitors have become the industry
standard for these types of applications and are recommended, but must be used with good judgment. Ceramic
capacitors that employ X7R-, X5R-, and COG-rated dielectric materials provide relatively good capacitive stability
across temperature. The use of Y5V-rated capacitors is discouraged because of large variations in capacitance.
Regardless of the ceramic capacitor type selected, ceramic capacitance varies with operating voltage and
temperature. Make sure to derate ceramic capacitors by at least 50%. The input and output capacitors
recommended herein account for a capacitance derating of approximately 50%, but at high VIN and VOUT
conditions (VIN = 5.5 V to VOUT = 5.0 V), the derating can be greater than 50%, and must be taken into
consideration.
8.1.1.1 Input and Output Capacitor Requirements (CIN and COUT
)
The TPS7A53-Q1 is designed and characterized for operation with ceramic capacitors of 47 µF or greater (22 µF
or greater of capacitance) at the output and 10 µF or greater (5 µF or greater of capacitance) at the input. Use at
least a 47-µF capacitor at the input to minimize input impedance. Place the input and output capacitors as near
as practical to the respective input and output pins in order to minimize trace parasitics. If the trace inductance
from the input supply to the TPS7A53-Q1 is high, a fast current transient can cause VIN to ring above the
absolute maximum voltage rating and damage the device. This situation can be mitigated by additional input
capacitors to dampen and keep the ringing below the device absolute maximum ratings.
A combination of multiple output capacitors boosts the high-frequency PSRR. The combination of one 0805-
sized, 47-µF ceramic capacitor in parallel with two 0805-sized, 10-µF ceramic capacitors with a sufficient voltage
rating, in conjunction with the PSRR boost circuit, optimizes PSRR for the frequency range of 400 kHz to
700 kHz, a typical range for dc-dc supply switching frequency. This 47-µF || 10-µF || 10-µF capacitor combination
also makes certain that at high input voltage and high output voltage configurations, the minimum effective
capacitance is met. Many 0805-sized, 47-µF ceramic capacitors have a voltage derating of approximately 60% to
80% at 5.0 V, so the addition of the two 10-µF capacitors makes sure that the capacitance is at or above 22 µF.
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Application Information (接下页)
8.1.1.2 Noise-Reduction and Soft-Start Capacitor (CNR/SS
)
The TPS7A53-Q1 features a programmable, monotonic, voltage-controlled soft start that is set with an external
capacitor (CNR/SS). Use an external CNR/SS to minimize inrush current into the output capacitors. This soft-start
feature eliminates power-up initialization problems when powering field-programmable gate arrays (FPGAs),
digital signal processors (DSPs), or other processors. The controlled voltage ramp of the output also reduces
peak inrush current during start-up, minimizing start-up transients to the input power bus.
To achieve a monotonic start-up, the TPS7A53-Q1 error amplifier tracks the voltage ramp of the external soft-
start capacitor until the voltage approaches the internal reference. The soft-start ramp time depends on the soft-
start charging current (INR/SS), the soft-start capacitance (CNR/SS), and the internal reference (VNR/SS). 公式 1
calculates soft-start ramp time:
tSS = (VNR/SS × CNR/SS) / INR/SS
(1)
INR/SS is provided in the Electrical Characteristics table and has a typical value of 6.2 µA.
The noise-reduction capacitor, in conjunction with the noise-reduction resistor, forms a low-pass filter (LPF) that
filters out the noise from the reference before being gained up with the error amplifier, thereby reducing the
device noise floor. The LPF is a single-pole filter and 公式 2 can calculate the cutoff frequency. The typical value
of RNR is 250 kΩ. Increasing the CNR/SS capacitor has a greater affect because the output voltage increases
when the noise from the reference is gained up even more at higher output voltages. For low-noise applications,
a 10-nF to 1-µF CNR/SS is recommended.
fcutoff = 1 / (2 × π × RNR × CNR/SS
)
(2)
8.1.1.3 Feed-Forward Capacitor (CFF)
Although a feed-forward capacitor (CFF) from the FB pin to the OUT pin is not required to achieve stability, a
10-nF external feed-forward capacitor optimizes the transient, noise, and PSRR performance. A higher
capacitance CFF can be used; however, the start-up time is longer and the power-good signal can incorrectly
indicate that the output voltage is settled. For a detailed description, see Pros and Cons of Using a Feed-
Forward Capacitor with a Low Dropout Regulator.
8.1.2 Soft Start and Inrush Current
Soft start refers to the ramp-up characteristic of the output voltage during LDO turnon after EN and UVLO
achieve threshold voltage. The noise-reduction capacitor serves a dual purpose of both governing output noise
reduction and programming the soft-start ramp during turnon.
Inrush current is defined as the current into the LDO at the IN pin during start-up. Inrush current then consists
primarily of the sum of load current and the current used to charge the output capacitor. This current is difficult to
measure because the input capacitor must be removed, which is not recommended. However, 公式 3 can
estimate this soft-start current:
C
OUT ´ dVOUT(t)
VOUT(t)
RLOAD
IOUT(t)
=
+
dt
where:
•
•
•
VOUT(t) is the instantaneous output voltage of the turnon ramp
dVOUT(t) / dt is the slope of the VOUT ramp
RLOAD is the resistive load impedance
(3)
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Application Information (接下页)
8.1.3 Optimizing Noise and PSRR
Improve the ultra-low noise floor and PSRR of the device by careful selection of:
•
•
•
•
•
CNR/SS for the low-frequency range
CFF in the midband frequency range
COUT for the high-frequency range
VIN – VOUT for all frequencies, and
VBIAS at lower input voltages
A larger noise-reduction capacitor improves low-frequency PSRR by filtering any noise coupling from the input
into the reference. To improve midband PSRR, use the feed-forward capacitor to place a pole-zero pair near the
edge of the loop bandwidth and push out the loop bandwidth. Use larger output capacitors to improve high-
frequency PSRR.
A higher input voltage improves the PSRR by giving the device more headroom to respond to noise on the input.
A bias rail also improves the PSRR at lower input voltages because greater headroom is provided for the internal
circuits.
The noise-reduction capacitor filters out low-frequency noise from the reference, and the feed-forward capacitor
reduces output voltage noise by filtering out the midband frequency noise. However, a large feed-forward
capacitor can create new issues that are discussed in Pros and Cons of Using a Feed-Forward Capacitor with a
Low Dropout Regulator.
Use a large output capacitor to reduce high-frequency output voltage noise. Additionally, a bias rail or higher
input voltage improves the noise because greater headroom is provided for the internal circuits.
表 4 lists the output voltage noise for the 10-Hz to 100-kHz band at a 5.0-V output for a variety of conditions with
an input voltage of 5.4 V, an R1 of 12.1 kΩ, and a load current of 3 A. The 5.0-V output is used because this
output is the worst-case condition for output voltage noise.
表 4. Output Noise Voltage at a 5.0-V Output
OUTPUT VOLTAGE NOISE
CNR/SS
(nF)
CFF
(nF)
COUT
(µF)
(µVRMS
11.7
7.7
)
10
10
10
47 || 10 || 10
47 || 10 || 10
47 || 10 || 10
1000
100
100
100
100
6
100
10
7.4
5.8
100
1000
8.1.4 Charge Pump Noise
The device internal charge pump generates a minimal amount of noise. Use a bias rail to minimize the internal
charge pump noise when the internal voltage is clamped, thereby reducing the overall output noise floor.
The high-frequency components of the output voltage noise density curves are filtered out in most applications
by using 10-nF to 100-nF bypass capacitors close to the load. Using a ferrite bead between the LDO output and
the load input capacitors forms a pi-filter, further reducing the high-frequency noise contribution.
8.1.5 Current Sharing
Current sharing is possible through the use of external operational amplifiers. For more details, see TI Design,
Current-Sharing Dual LDOs, and verified reference design 6 A Current-Sharing Dual LDO.
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8.1.6 Adjustable Operation
As shown in 图 43, the output voltage of the TPS7A53-Q1 is set using external resistors.
Optional Bias
CBIAS
Supply
BIAS
EN
IN
PG
RPG
Input
Supply
To Load
OUT
CIN
CFF
R1
COUT
TI-Device™
FB
NR/SS
R2
CNR/SS
GND
图 43. Adjustable Operation
Use 公式 4 to calculate R1 and R2 for any output voltage range. This resistive network must provide a current
equal to or greater than 5 µA for dc accuracy. To optimize the noise and PSRR, use an R1 of 12.1 kΩ.
VOUT = VNR/SS × (1 + R1 / R2)
(4)
表 5 shows the resistor combinations required to achieve several common rails using standard 1%-tolerance
resistors.
表 5. Recommended Feedback-Resistor Values
TARGETED OUTPUT
FEEDBACK RESISTOR VALUES(1)
CALCULATED OUTPUT
VOLTAGE
(V)
VOLTAGE
(V)
R1 (kΩ)
R2 (kΩ)
0.9
12.4
12.4
12.4
12.4
12.4
12.4
12.4
12.1
12.4
12.1
12.1
11.8
12.1
11.8
12.4
100
66.5
49.9
33.2
24.9
14.3
10
0.899
0.949
0.999
1.099
1.198
1.494
1.798
1.89
0.95
1.00
1.10
1.20
1.50
1.80
1.90
2.50
2.85
3.00
3.30
3.60
4.5
8.87
5.9
2.48
4.75
4.42
3.74
3.48
2.55
2.37
2.838
2.990
3.324
3.582
4.502
4.985
5.00
(1) R1 is connected from OUT to FB; R2 is connected from FB to GND.
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8.1.7 Power-Good Operation
For proper operation of the power-good circuit, the pullup resistor value must be between 10 kΩ and 100 kΩ. The
lower limit of 10 kΩ results from the maximum pulldown strength of the power-good transistor, and the upper limit
of 100 kΩ results from the maximum leakage current at the power-good node. If the pullup resistor is outside of
this range, then the power-good signal may not read a valid digital logic level.
Using a large CFF with a small CNR/SS causes the power-good signal to incorrectly indicate that the output voltage
has settled during turnon. The CFF time constant must be greater than the soft-start time constant for proper
operation of the PG during start-up. For a detailed description, see Pros and Cons of Using a Feed-Forward
Capacitor with a Low Dropout Regulator.
The state of PG is only valid when the device operates above the minimum supply voltage. During short UVLO
events and at light loads, power-good does not assert because the output voltage is sustained by the output
capacitance.
8.1.8 Undervoltage Lockout (UVLO) Operation
The UVLO circuit makes sure that the device remains disabled before the input or bias supplies reach the
minimum operational voltage range, and that the device shuts down when the input supply or bias supply falls
too low.
The UVLO circuit has a minimum response time of several microseconds to fully assert. During this time, a
downward line transient below approximately 0.8 V causes the UVLO to assert for a short time; however, the
UVLO circuit does not have enough stored energy to fully discharge the internal circuits inside of the device.
When the UVLO circuit does not fully discharge, the internal circuits of the output are not fully disabled.
The effect of the downward line transient can be mitigated by either using a larger input capacitor to limit the fall
time of the input supply when operating near the minimum VIN, or by using a bias rail.
图 44 shows the UVLO circuit response to various input voltage events. The diagram can be separated into the
following regions:
•
•
•
Region A: The device does not turn on until the input reaches the UVLO rising threshold.
Region B: Normal operation with a regulated output.
Region C: Brownout event above the UVLO falling threshold (UVLO rising threshold – UVLO hysteresis). The
output may fall out of regulation but the device is still enabled.
•
•
Region D: Normal operation with a regulated output.
Region E: Brownout event below the UVLO falling threshold. The device is disabled in most cases and the
output falls because of the load and active discharge circuit. The device is reenabled when the UVLO rising
threshold is reached by the input voltage and a normal start-up then follows.
•
•
Region F: Normal operation followed by the input falling to the UVLO falling threshold.
Region G: The device is disabled when the input voltage falls below the UVLO falling threshold to 0 V. The
output falls because of the load and active discharge circuit.
UVLO Rising Threshold
UVLO Hysteresis
VIN
C
VOUT
tAt
tBt
tDt
tEt
tFt
tGt
图 44. Typical UVLO Operation
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8.1.9 Dropout Voltage (VDO
)
Generally speaking, the dropout voltage often refers to the minimum voltage difference between the input and
output voltage (VDO = VIN – VOUT) that is required for regulation. When VIN drops below the required VDO for the
given load current, the device functions as a resistive switch and does not regulate output voltage. Dropout
voltage is proportional to the output current because the device is operating as a resistive switch.
Dropout voltage is affected by the drive strength for the gate of the pass element, which is nonlinear with respect
to VIN on this device because of the internal charge pump. The charge pump causes a higher dropout voltage at
lower input voltages when a bias rail is not used.
For this device, dropout voltage increases exponentially when the input voltage nears its maximum operating
voltage because the charge pump is internally clamped to 8.0 V.
8.1.10 Device Behavior During Transition From Dropout Into Regulation
Some applications have transients that place the device into dropout, especially with a device such as a high-
current linear regulator. A typical application with these transient conditions may require setting VIN ≤ (VOUT
+
VDO) in order to keep the device junction temperature within the specified operating range. A load transient or
line transient with these conditions can place the device into dropout; for example, a load transient from 1 A to 4
A at 1 A/µs when operating with a VIN of 5.4 V and a VOUT of 5.0 V.
The load transient saturates the error amplifier output stage when the gate of the pass element is driven as high
as possible by the error amplifier, thus making the pass element function like a resistor from VIN to VOUT. The
error amplifier response time to this load transient (IOUT = 4 A to 1 A at 1 A/µs) is limited because the error
amplifier must first recover from saturation, and then place the pass element back into active mode. During the
recovery from the load transient, VOUT overshoots because the pass element is functioning as a resistor from VIN
to VOUT. If operating under these conditions, apply a higher dc load or increase the output capacitance in order to
reduce the overshoot.
8.1.11 Load Transient Response
The load-step transient response is the output voltage response by the LDO to a step in load current, whereby
output voltage regulation is maintained. There are two key transitions during a load transient response: the
transition from a light to a heavy load, and the transition from a heavy to a light load. The regions shown in 图 45
are broken down in this section. Regions A, E, and H are where the output voltage is in steady-state regulation.
tAt
tCt
tDt
tEt
tGt
tHt
B
F
图 45. Load Transient Waveform
During transitions from a light load to a heavy load:
•
Initial voltage dip is a result of the depletion of the output capacitor charge and parasitic impedance to the
output capacitor (region B)
•
Recovery from the dip results from the LDO increasing its sourcing current, and leads to output voltage
regulation (region C)
During transitions from a heavy load to a light load:
•
Initial voltage rise results from the LDO sourcing a large current, and leads to the output capacitor charge to
increase (region F)
•
Recovery from the rise results from the LDO decreasing its sourcing current in combination with the load
discharging the output capacitor (region G)
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Transitions between current levels changes the internal power dissipation because the TPS7A53-Q1 is a high-
current device (region D). The change in power dissipation changes the die temperature during these transitions,
and leads to a slightly different voltage level. This different output voltage level shows up in the various load
transient responses.
A larger output capacitance reduces the peaks during a load transient but slows down the response time of the
device. A larger dc load also reduces the peaks because the amplitude of the transition is lowered and a higher
current discharge path is provided for the output capacitor.
8.1.12 Reverse Current Protection Considerations
As with most LDOs, this device can be damaged by excessive reverse current.
Conditions where excessive reverse current can occur are outlined in this section, all of which can exceed the
absolute maximum rating of VOUT > VIN + 0.3 V:
•
If the device has a large COUT, then the input supply collapses quickly and the load current becomes very
small
•
•
The output is biased when the input supply is not established
The output is biased above the input supply
If an excessive reverse current flow is expected in the application, then external protection must be used to
protect the device. 图 46 shows one approach of protecting the device.
Schottky Diode
Internal Body Diode
IN
OUT
Device
COUT
CIN
GND
图 46. Example Circuit for Reverse Current Protection Using a Schottky Diode
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8.1.13 Power Dissipation (PD)
Circuit reliability demands that proper consideration be given to device power dissipation, location of the circuit
on the printed circuit board (PCB), and correct sizing of the thermal plane. The PCB area around the regulator
must be as free as possible of other heat-generating devices that cause added thermal stresses.
As a first-order approximation, power dissipation in the regulator depends on the input-to-output voltage
difference and load conditions. Use 公式 5 to calculate PD:
PD = (VOUT - VIN) ´ IOUT
(5)
注
Power dissipation can be minimized, and thus greater efficiency achieved, by proper
selection of the system voltage rails. Proper selection allows the minimum input-to-output
voltage differential to be obtained. The low dropout of the TPS7A53-Q1 allows for
maximum efficiency across a wide range of output voltages.
The primary heat conduction path for the package is through the thermal pad to the PCB. Solder the thermal pad
to a copper pad area under the device. This pad area contains an array of plated vias that conduct heat to any
inner plane areas or to a bottom-side copper plane.
The maximum power dissipation determines the maximum allowable junction temperature (TJ) for the device.
According to 公式 6, power dissipation and junction temperature are most often related by the junction-to-
ambient thermal resistance (RθJA) of the combined PCB and device package and the temperature of the ambient
air (TA). 公式 6 is rearranged in 公式 7 for output current.
TJ = TA + (RθJA × PD)
(6)
(7)
IOUT = (TJ – TA) / [RθJA × (VIN – VOUT)]
Unfortunately, this thermal resistance (RθJA) is highly dependent on the heat-spreading capability built into the
particular PCB design, and therefore varies according to the total copper area, copper weight, and location of the
planes. The RθJA recorded in the Electrical Characteristics table is determined by the JEDEC standard, PCB, and
copper-spreading area, and is only used as a relative measure of package thermal performance. For a well-
designed thermal layout, RθJA is actually the sum of the VQFN package junction-to-case (bottom) thermal
resistance (RθJC(bot)) plus the thermal resistance contribution by the PCB copper.
8.1.14 Estimating Junction Temperature
The JEDEC standard now recommends the use of psi (Ψ) thermal metrics to estimate the junction temperatures
of the LDO when in-circuit on a typical PCB board application. These metrics are not strictly speaking thermal
resistances, but rather offer practical and relative means of estimating junction temperatures. These psi metrics
are determined to be significantly independent of the copper-spreading area. The key thermal metrics (ΨJT and
ΨJB) are used in accordance with 公式 8 and are given in the Electrical Characteristics table.
YJT: TJ = TT + YJT ´ PD
YJB: TJ = TB + YJB ´ PD
where:
•
•
•
PD is the power dissipated as explained in 公式 5
TT is the temperature at the center-top of the device package, and
TB is the PCB surface temperature measured 1 mm from the device package and centered on the package
edge
(8)
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8.2 Typical Application
This section discusses the implementation of the TPS7A53-Q1 using an adjustable feedback network to regulate
a 3-A load requiring good PSRR at high frequency with low-noise at an output voltage of 5.0 V. 图 47 provides a
schematic for this typical application circuit.
Optional Bias
CBIAS
Supply
BIAS
EN
IN
PG
RPG
Input
Supply
To Load
OUT
CIN
CFF
R1
COUT
TI-Device™
FB
NR/SS
R2
CNR/SS
GND
图 47. Typical Application for a 5.0-V Rail
8.2.1 Design Requirements
For this design example, use the parameters listed in 表 6 as the input parameters.
表 6. Design Parameters
PARAMETER
Input voltage
DESIGN REQUIREMENT
5.50 V, ±1%, provided by the dc-dc converter switching at 500 kHz
Bias voltage
Not used because VOUT ≥ 2.20 V
Output voltage
5.0 V, ±1%
Output current
3.0 A (maximum), 10 mA (minimum)
RMS noise, 10 Hz to 100 kHz
PSRR at 500 kHz
Start-up time
< 10 µVRMS
> 40 dB
< 25 ms
8.2.2 Detailed Design Procedure
At 3.0 A and 5.0 VOUT, the dropout of the TPS7A53-Q1 has a 340-mV maximum dropout over temperature; thus,
a 500-mV headroom is sufficient for operation over both input and output voltage accuracy. At full load and high
temperature on some devices, the TPS7A53-Q1 can enter dropout if both the input and output supply are
beyond the edges of the respective accuracy specification.
For a 5.0-V output. use external adjustable resistors. See the resistor values in listed 表 5 for choosing resistors
for a 5.0-V output.
Input and output capacitors are selected in accordance with the Recommended Capacitor Types section.
Ceramic capacitances of 47 µF for the input and one 47-µF capacitor in parallel with two 10-µF capacitors for the
output are selected.
To satisfy the required start-up time and still maintain low noise performance, a 100-nF CNR/SS is selected. 公式 9
calculates this value.
tSS = (VNR/SS × CNR/SS) / INR/SS
(9)
At the 3.0-A maximum load, the internal power dissipation is 1.5 W and corresponds to a 53.1°C junction
temperature rise for the RGR package on a standard JEDEC board. With an 55°C maximum ambient
temperature, the junction temperature is at 108.1°C. To further minimize noise, a feed-forward capacitance (CFF)
of 10 nF is selected.
28
版权 © 2017–2018, Texas Instruments Incorporated
TPS7A53-Q1
www.ti.com.cn
ZHCSHB7B –SEPTEMBER 2017–REVISED JULY 2018
8.2.3 Application Curves
100
80
60
40
20
0
100
80
60
40
20
0
IOUT = 0.1 A
IOUT = 0.5 A
IOUT = 1.0 A
IOUT = 2.0 A
IOUT = 2.5 A
IOUT = 3.0 A
VIN = 5.30 V
VIN = 5.35 V
VIN = 5.40 V
VIN = 5.45 V
VIN = 5.50 V
VIN = 5.55 V
VIN = 5.60 V
1x101
1x102
1x103
1x104
1x105
1x106
1x107
1x101
1x102
1x103
1x104
1x105
1x106
1x107
Frequency (Hz)
Frequency (Hz)
图 48. PSRR vs Frequency and IOUT for VOUT = 5.0 V
图 49. PSRR vs Frequency and VIN for VOUT = 5.0 V at IOUT
= 3.0 A
9 Power Supply Recommendations
The TPS7A53-Q1 is designed to operate from an input voltage supply range between 1.1 V and 6.5 V. If the
input supply is less than 1.4 V, then a bias rail of at least 3.0 V must be used. The input voltage range provides
adequate headroom in order for the device to have a regulated output. This input supply must be well regulated.
If the input supply is noisy, use additional input capacitors with low ESR to help improve output noise
performance.
10 Layout
10.1 Layout Guidelines
10.1.1 Board Layout
For best overall performance, place all circuit components on the same side of the circuit board and as near as
practical to the respective LDO pin connections. Place ground return connections to the input and output
capacitor, and to the LDO ground pin as close to each other as possible, connected by a wide, component-side,
copper surface. To avoid negative system performance, do not use of vias and long traces to the input and
output capacitors. The grounding and layout scheme illustrated in 图 50 minimizes inductive parasitics, and
thereby reduces load-current transients, minimizes noise, and increases circuit stability.
To improve performance, use a ground reference plane, either embedded in the PCB itself or placed on the
bottom side of the PCB opposite the components. This reference plane serves to provide accuracy of the output
voltage, shield noise, and behaves similar to a thermal plane to spread (or sink) heat from the LDO device when
connected to the thermal pad. In most applications, this ground plane is necessary to meet thermal requirements.
10.1.2 RTK Package — High CTE Mold Compound
The RTK package uses a mold compound with a high coefficient of thermal expansion (CTE) of 12 ppm/°C. This
mold compound allows for the CTE of the packaged IC to more closely match the CTE of a conventional FR4
PCB (~14 ppm/°C to 17 ppm/°C). This CTE match is important when considering the effects that temperature
swings can induce on a board with large differences in CTE values. Package and board combinations with widely
dissimilar CTEs can experience mechanical cracking or fracturing of the solder joints caused by frequent
changes in temperature, and the corresponding differences in expansion. Devices with normal mold compounds
in similar packages typically have CTE values that are 25% lower than values found with the RTK package.
版权 © 2017–2018, Texas Instruments Incorporated
29
TPS7A53-Q1
ZHCSHB7B –SEPTEMBER 2017–REVISED JULY 2018
www.ti.com.cn
10.2 Layout Example
Ground Plane for Thermal Relief and Signal
Ground
10
9
8
7
6
To PG Pullup Supply
PG Output
NC 11
5
DNC
PG
CBIAS
RPG
To Bias Supply
To Signal Ground
Enable Signal
BIAS
12
4
3
Thermal Pad
R2
NR/SS 13
FB
To Signal Ground
To Load
CNR/SS
EN 14
2
1
NC
CFF R1
15
IN
OUT
16
18 19 20
17
Input Power Plane
Output Power Plane
CIN
COUT
Power Ground Plane
Vias used for application purposes.
图 50. Example Layout
30
版权 © 2017–2018, Texas Instruments Incorporated
TPS7A53-Q1
www.ti.com.cn
ZHCSHB7B –SEPTEMBER 2017–REVISED JULY 2018
11 器件和文档支持
11.1 器件支持
11.1.1 开发支持
11.1.1.1 参考设计
如需了解相关的 TI 参考设计,请参阅:
TI 设计 - 电流均流双路 LDO (TIDA-00270)。
11.1.2 器件命名规则
表 7. 订购信息(1)
产品
说明
YYY 为封装标识符。
Z 为封装数量。
TPS7A5301QYYYZ Q1
(1) 欲获得最新的封装和订货信息,请参阅本文档末尾的封装选项附录,或者访问 www.ti.com.cn 查看器件产品文件夹。
11.2 文档支持
11.2.1 相关文档
请参阅如下相关文档:
•
•
•
TPS3702 高精度过压和欠压监视器
《使用前馈电容器和低压降稳压器的优缺点》
6A 电流均流双路 LDO
11.3 接收文档更新通知
要接收文档更新通知,请导航至 TI.com.cn 上的器件产品文件夹。单击右上角的通知我 进行注册,即可每周接收产
品信息更改摘要。有关更改的详细信息,请查看任何已修订文档中包含的修订历史记录。
11.4 社区资源
下列链接提供到 TI 社区资源的连接。链接的内容由各个分销商“按照原样”提供。这些内容并不构成 TI 技术规范,
并且不一定反映 TI 的观点;请参阅 TI 的 《使用条款》。
TI E2E™ 在线社区 TI 的工程师对工程师 (E2E) 社区。此社区的创建目的在于促进工程师之间的协作。在
e2e.ti.com 中,您可以咨询问题、分享知识、拓展思路并与同行工程师一道帮助解决问题。
设计支持
TI 参考设计支持 可帮助您快速查找有帮助的 E2E 论坛、设计支持工具以及技术支持的联系信息。
11.5 商标
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
11.6 静电放电警告
ESD 可能会损坏该集成电路。德州仪器 (TI) 建议通过适当的预防措施处理所有集成电路。如果不遵守正确的处理措施和安装程序 , 可
能会损坏集成电路。
ESD 的损坏小至导致微小的性能降级 , 大至整个器件故障。 精密的集成电路可能更容易受到损坏 , 这是因为非常细微的参数更改都可
能会导致器件与其发布的规格不相符。
11.7 术语表
SLYZ022 — TI 术语表。
这份术语表列出并解释术语、缩写和定义。
版权 © 2017–2018, Texas Instruments Incorporated
31
TPS7A53-Q1
ZHCSHB7B –SEPTEMBER 2017–REVISED JULY 2018
www.ti.com.cn
12 机械、封装和可订购信息
以下页面包含机械、封装和可订购信息。这些信息是指定器件的最新可用数据。数据如有变更,恕不另行通知,且
不会对此文档进行修订。如需获取此产品说明书的浏览器版本,请查阅左侧的导航栏。
32
版权 © 2017–2018, Texas Instruments Incorporated
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status Package Type Package Pins Package
Eco Plan
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
Samples
Drawing
Qty
(1)
(2)
(3)
(4/5)
(6)
TPS7A5301QRGRRQ1
TPS7A5301WQRTKRQ1
ACTIVE
ACTIVE
VQFN
VQFN
RGR
RTK
20
20
3000 RoHS & Green
3000 RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
Level-2-260C-1 YEAR
-40 to 150
-40 to 150
A5301
5301WQ
NIPDAUAG
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6)
Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two
lines if the finish value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
3-Jun-2022
TAPE AND REEL INFORMATION
REEL DIMENSIONS
TAPE DIMENSIONS
K0
P1
W
B0
Reel
Diameter
Cavity
A0
A0 Dimension designed to accommodate the component width
B0 Dimension designed to accommodate the component length
K0 Dimension designed to accommodate the component thickness
Overall width of the carrier tape
W
P1 Pitch between successive cavity centers
Reel Width (W1)
QUADRANT ASSIGNMENTS FOR PIN 1 ORIENTATION IN TAPE
Sprocket Holes
Q1 Q2
Q3 Q4
Q1 Q2
Q3 Q4
User Direction of Feed
Pocket Quadrants
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
B0
K0
P1
W
Pin1
Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant
(mm) W1 (mm)
TPS7A5301QRGRRQ1
VQFN
RGR
RTK
20
20
3000
3000
330.0
330.0
12.4
15.4
3.75
4.3
3.75
4.3
1.15
1.1
8.0
8.0
12.0
12.0
Q2
Q1
TPS7A5301WQRTKRQ1 VQFN
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
3-Jun-2022
TAPE AND REEL BOX DIMENSIONS
Width (mm)
H
W
L
*All dimensions are nominal
Device
Package Type Package Drawing Pins
SPQ
Length (mm) Width (mm) Height (mm)
TPS7A5301QRGRRQ1
TPS7A5301WQRTKRQ1
VQFN
VQFN
RGR
RTK
20
20
3000
3000
367.0
336.6
367.0
336.6
35.0
41.3
Pack Materials-Page 2
GENERIC PACKAGE VIEW
RGR 20
3.5 x 3.5, 0.5 mm pitch
VQFN - 1 mm max height
PLASTIC QUAD FLATPACK - NO LEAD
This image is a representation of the package family, actual package may vary.
Refer to the product data sheet for package details.
4228482/A
www.ti.com
PACKAGE OUTLINE
RGR0020A
VQFN - 1 mm max height
PLASTIC QUAD FLATPACK - NO LEAD
3.65
3.35
A
B
PIN 1 INDEX AREA
3.65
3.35
SIDE WALL
METAL THICKNESS
DIM A
1.0
0.8
OPTION 1
0.1
OPTION 2
0.2
C
SEATING PLANE
0.08 C
0.05
0.00
2X 2
(DIM A) TYP
SYMM
6
10
EXPOSED
THERMAL PAD
11
5
SYMM
21
2X 2
2.05 0.1
16X 0.5
1
15
0.30
20X
PIN 1 ID
20
16
0.18
0.5
0.3
0.1
C A B
20X
0.05
4219031/B 04/2022
NOTES:
1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing
per ASME Y14.5M.
2. This drawing is subject to change without notice.
3. The package thermal pad must be soldered to the printed circuit board for thermal and mechanical performance.
www.ti.com
EXAMPLE BOARD LAYOUT
RGR0020A
VQFN - 1 mm max height
PLASTIC QUAD FLATPACK - NO LEAD
(2.05)
SYMM
16
SEE SOLDER MASK
DETAIL
20
20X (0.6)
15
20X (0.24)
16X (0.5)
1
(2.05)
SYMM
21
(3.3)
(0.775)
5
11
(R0.05) TYP
(
0.2) TYP
VIA
6
10
(0.775)
(3.3)
LAND PATTERN EXAMPLE
EXPOSED METAL SHOWN
SCALE: 20X
0.07 MIN
ALL AROUND
0.07 MAX
ALL AROUND
METAL UNDER
SOLDER MASK
METAL EDGE
EXPOSED METAL
SOLDER MASK
OPENING
EXPOSED
METAL
SOLDER MASK
OPENING
NON SOLDER MASK
DEFINED
SOLDER MASK DEFINED
(PREFERRED)
SOLDER MASK DETAILS
4219031/B 04/2022
NOTES: (continued)
4. This package is designed to be soldered to a thermal pad on the board. For more information, see Texas Instruments literature
number SLUA271 (www.ti.com/lit/slua271).
5. Vias are optional depending on application, refer to device data sheet. If any vias are implemented, refer to their locations shown
on this view. It is recommended that vias under paste be filled, plugged or tented.
www.ti.com
EXAMPLE STENCIL DESIGN
RGR0020A
VQFN - 1 mm max height
PLASTIC QUAD FLATPACK - NO LEAD
(0.56) TYP
16
20
20X (0.6)
1
20X (0.24)
16X (0.5)
15
(0.56) TYP
(3.3)
21
SYMM
4X (0.92)
11
(R0.05) TYP
5
6
10
4X (0.92)
SYMM
(3.3)
SOLDER PASTE EXAMPLE
BASED ON 0.125 MM THICK STENCIL
SCALE: 20X
EXPOSED PAD 21
81% PRINTED SOLDER COVERAGE BY AREA UNDER PACKAGE
4219031/B 04/2022
NOTES: (continued)
6. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate
design recommendations.
www.ti.com
重要声明和免责声明
TI“按原样”提供技术和可靠性数据(包括数据表)、设计资源(包括参考设计)、应用或其他设计建议、网络工具、安全信息和其他资源,
不保证没有瑕疵且不做出任何明示或暗示的担保,包括但不限于对适销性、某特定用途方面的适用性或不侵犯任何第三方知识产权的暗示担
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这些资源可供使用 TI 产品进行设计的熟练开发人员使用。您将自行承担以下全部责任:(1) 针对您的应用选择合适的 TI 产品,(2) 设计、验
证并测试您的应用,(3) 确保您的应用满足相应标准以及任何其他功能安全、信息安全、监管或其他要求。
这些资源如有变更,恕不另行通知。TI 授权您仅可将这些资源用于研发本资源所述的 TI 产品的应用。严禁对这些资源进行其他复制或展示。
您无权使用任何其他 TI 知识产权或任何第三方知识产权。您应全额赔偿因在这些资源的使用中对 TI 及其代表造成的任何索赔、损害、成
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