BQ25175YBGR [TI]
采用 WCSP 封装的独立单节 800mA 线性电池充电器 | YBG | 6 | -40 to 85;型号: | BQ25175YBGR |
厂家: | TEXAS INSTRUMENTS |
描述: | 采用 WCSP 封装的独立单节 800mA 线性电池充电器 | YBG | 6 | -40 to 85 电池 |
文件: | 总29页 (文件大小:1938K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
BQ25175
ZHCSO24A –JUNE 2021 –REVISED SEPTEMBER 2021
BQ25175 具有4.35V 充电电压和充电指示功能的独立单节800mA 线性电池充电
器
1 特性
3 说明
• 可承受高达30V 的输入电压
• 自动睡眠模式,可降低功耗
BQ25175 是一款集成式 800mA 线性充电器,适用于
单节锂离子和锂聚合物电池。 该器件具有为电池充电
的单电源输出。只要安全计时器期间内平均系统负载不
会妨碍电池充满电,就可以使系统负载与电池并联。当
系统负载与电池并联时,充电电流会由系统和电池共
享。
– 350nA 电池泄漏电流
– 禁用充电时,输入泄漏电流为80µA
• 支持单节锂离子和锂聚合物电池
• 固定4.35V 电池稳压电压
• 操作可使用外部电阻器进行编程
– ISET 用于设置10mA 至800mA 的充电电流
• 高精度
该器件分三个阶段为锂离子/锂聚合物电池充电:预充
电阶段,用于恢复完全放电的电池;快速充电恒定电流
阶段,用于使电池充上大部分电量;以及电压调节阶
段,用于使电池电量充满。
– 充电电压精度为±0.5%
– 充电电流精度为±10%
• 充电特性
在所有充电阶段,内部控制环路都会监控 IC 结温,当
其超过内部温度阈值TREG 时,它会减少充电电流。
– 预充电电流为20% ISET
– 终止电流为10% ISET
– NTC 热敏电阻输入用于监控电池温度
– 禁用低温和高温充电
充电器功率级和充电电流感测功能均完全集成。该充电
器具有高精度电流和电压调节环路功能、充电状态显示
和自动充电终止功能。快速充电电流可通过外部电阻进
行编程。预充电和终止电流阈值由快速充电电流设置决
定。
– 以20% ISET 低温充电
– TS 引脚用于充电功能控制
– 开漏输出用于状态和故障指示
• 集成故障保护
器件信息
器件型号(1)
BQ25175
封装尺寸(标称值)
封装
– 6.6V 输入过压保护
DSBGA (6)
0.8 mm x 1.25 mm
– 1000mA 过流保护
– 125°C 热调节;150°C 热关断保护
– OUT 短路保护
(1) 如需了解所有可用封装,请参阅数据表末尾的可订购产品附
录。
– ISET 引脚短路/开路保护
VIN: 3.0V œ 6.5V
IN
OUT
1s Li-Ion
2 应用
• 智能追踪器
• 真正无线耳机
• 智能远程控制
• 脉搏血氧仪
• 血糖监控
ISET
GND
STAT
TS
BQ25175
简化版原理图
本文档旨在为方便起见,提供有关TI 产品中文版本的信息,以确认产品的概要。有关适用的官方英文版本的最新信息,请访问
www.ti.com,其内容始终优先。TI 不保证翻译的准确性和有效性。在实际设计之前,请务必参考最新版本的英文版本。
English Data Sheet: SLUSDY7
BQ25175
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ZHCSO24A –JUNE 2021 –REVISED SEPTEMBER 2021
Table of Contents
7.4 Device Functional Modes..........................................16
8 Application and Implementation..................................18
8.1 Application Information............................................. 18
8.2 Typical Applications.................................................. 18
9 Power Supply Recommendations................................22
10 Layout...........................................................................22
10.1 Layout Guidelines................................................... 22
10.2 Layout Example...................................................... 22
11 Device and Documentation Support..........................23
11.1 Device Support........................................................23
11.2 接收文档更新通知................................................... 23
11.3 支持资源..................................................................23
11.4 Trademarks............................................................. 23
11.5 Electrostatic Discharge Caution..............................23
11.6 术语表..................................................................... 23
12 Mechanical, Packaging, and Orderable
1 特性................................................................................... 1
2 应用................................................................................... 1
3 说明................................................................................... 1
4 Revision History.............................................................. 2
5 Pin Configuration and Functions...................................3
6 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 ............................................6
6.6 Timing Requirements .................................................7
6.7 Typical Characteristics................................................8
7 Detailed Description......................................................10
7.1 Overview...................................................................10
7.2 Functional Block Diagram.........................................12
7.3 Feature Description...................................................13
Information.................................................................... 24
4 Revision History
注:以前版本的页码可能与当前版本的页码不同
Changes from Revision * (June 2021) to Revision A (September 2021)
Page
• 将“预告信息”更改为“量产数据”.................................................................................................................. 1
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5 Pin Configuration and Functions
1
2
OUT
IN
A
B
C
TS
ISET
GND
STAT
Top View = Xray through a soldered down part with A1 starting in upper left corner
图5-1. YBG Package 6-Pin DSBGA Top View
表5-1. Pin Functions
PIN
I/O
DESCRIPTION
NAME
OUT
NO.
A1
P
Battery connection. System load may be connected in parallel to battery. Bypass OUT with at least
a 1-μF capacitor to GND, place close to the IC.
IN
A2
B1
P
I
Input power, connected to external DC supply. Bypass IN with at least a 1-μF capacitor to GND,
place close to the IC.
TS
Temperature qualification voltage input. Connect a negative temperature coefficient (NTC)
thermistor directly from TS to GND (AT103-2 recommended). Charge suspends when TS < VHOT or
TS > VCOLD. Charge at 20% of ISET when VCOLD > TS > VCOOL. If TS function is not needed,
connect an external 10-kΩresistor from this pin to GND. Pulling TS < VTS_ENZ disables the charger.
ISET
STAT
GND
B2
C1
C2
I
Programs the device fast-charge current. An external resistor from ISET to GND defines fast charge
current value. Expected range is 30 kΩ (10 mA) to 375 Ω (800 mA). ICHG = KISET / RISET
.
Precharge current is defined as 20% of ICHG. Termination current is defined as 10% of ICHG.
O
–
Open drain charger status indication output. Connect to pull-up rail via 10-kΩresistor.
LOW indicates charge in progress. HIGH indicates charge complete or charge disabled. When a
fault condition is detected, the STAT pin blinks at 1 Hz. If unsued, this pin can be left floating.
Ground pin
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6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)(1)
MIN
–0.3
–0.3
–0.3
–40
–65
MAX
30
UNIT
V
Voltage
Voltage
Voltage
TJ
IN
OUT
13
V
ISET, STAT, TS
Junction temperature
Storage temperature
5.5
150
150
V
°C
°C
Tstg
(1) Stresses beyond those listed under Absolute Maximum Rating 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 Condition. Exposure to absolute-maximum-rated conditions for extended periods may affect device
reliability.
6.2 ESD Ratings
VALUE
UNIT
Human body model (HBM), per ANSI/ESDA/
JEDEC JS-001(1)
±2500
V(ESD)
Electrostatic discharge
V
Charged device model (CDM), per ANSI/ESDA/
JEDEC JS-002(2)
±1500
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN
NOM
MAX
6.6
UNIT
V
VIN
Input voltage
3.0
VOUT
IOUT
TJ
Output voltage
4.35
0.8
V
Output current
A
Junction temperature
IN capacitor
125
°C
µF
µF
kΩ
kΩ
–40
1
CIN
COUT
RISET
RTS
OUT capacitor
1
ISET resistor
0.375
30
TS thermistor resistor (recommend 103AT-2)
10
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6.4 Thermal Information
BQ25175
THERMAL METRIC(1)
YBG
6 PINS
132.4
1.5
UNIT
RθJA
Junction-to-ambient thermal resistance (JEDEC(1)
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
36.9
0.4
Junction-to-top characterization parameter
Junction-to-board characterization parameter
Junction-to-case (bottom) thermal resistance
ΨJT
36.9
N/A
ΨJB
RθJC(bot)
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
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6.5 Electrical Characteristics
3.0V < VIN < VIN_OV and VIN > VOUT + VSLEEP, TJ = -40°C to +125°C, and TJ = 25°C for typical values (unless otherwise
noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
QUIESCENT CURRENTS
OUT= 4.2V, IN floating or IN = 0V - 5V,
Charge Disabled, TJ = 25 °C
0.350
0.350
80
0.6 µA
0.8 µA
110 µA
µA
IQ_OUT
Quiescent output current (OUT)
OUT= 4.2V, IN floating or IN = 0V - 5V,
Charge Disabled, TJ < 105 °C
Shutdown input current (IN) with
charge disabled via TS pin
IN = 5V, Charge Disabled (VTS < VTS_ENZ),
no battery
ISD_IN_TS
ISTANDBY_IN
IQ_IN
Standby input current (IN) with charge
terminated
IN = 5V, Charge Enabled, charge terminated
190
IN = 5V, OUT = 3.8V, Charge Enabled,
ICHG = 0A
Quiescent input current (IN)
0.45
0.6 mA
INPUT
VIN_OP
IN operating range
3.0
3.05
2.80
95
6.6
3.15
3.10
V
V
V
VIN_LOWV
VIN_LOWV
VSLEEPZ
VSLEEP
VIN_OV
IN voltage to start charging
IN voltage to stop charging
Exit sleep mode threshold
Sleep mode threshold hysteresis
VIN overvoltage rising threshold
VIN overvoltage falling threshold
IN rising
3.09
2.95
135
80
IN falling
IN rising, VIN - VOUT, OUT = 4V
IN falling, VIN - VOUT, OUT = 4V
IN rising
175 mV
mV
6.60
6.75
6.63
6.90
V
V
VIN_OVZ
IN falling
CONFIGURATION PINS SHORT/OPEN PROTECTION
RISET below this at startup, charger does not
initiate charge, power cycle or TS toggle to
reset
Highest resistor value considered
short
RISET_SHORT
350
Ω
BATTERY CHARGER
VDO
Dropout voltage (VIN - VOUT
)
VIN = 4.4V, IOUT = 300mA
Tj = 25℃
425
mV
V
VREG_ACC
VREG_ACC
4.328
4.306
4.350 4.3721
OUT charge voltage accuracy
4.350
4.393
V
Tj = -40℃to 125℃
Typical charge current regulation
range
ICHG_RANGE
KISET
VOUT > VBAT_LOWV
10
800 mA
330
Charge current setting factor, ICHG
KISET / RISET
=
10mA < ICHG < 800mA
270
300
AΩ
720
450
90
800
500
100
10
880 mA
550 mA
110 mA
11 mA
RISET = 375Ω, OUT = 3.8V
RISET = 600Ω, OUT = 3.8V
RISET = 3.0kΩ, OUT = 3.8V
RISET = 30kΩ, OUT = 3.8V
ICHG_ACC
Charge current accuracy
9
Typical pre-charge current, as
percentage of ICHG
IPRECHG
VOUT < VBAT_LOWV
20
%
144
85
160
100
20
176 mA
110 mA
22 mA
2.6 mA
RISET = 375Ω, OUT = 2.5V
RISET = 600Ω, OUT = 2.5V
RISET = 3.0kΩ, OUT = 2.5V
RISET = 30kΩ, OUT = 2.5V
IPRECHG_ACC
Precharge current accuracy
18
1.4
2
Typical termination current, as
percentage of ICHG
ITERM
VOUT = VREG
10
%
45
8.5
0.4
50
10
1
55 mA
11.5 mA
1.6 mA
RISET = 600Ω
RISET = 3.0kΩ
RISET =30kΩ
ITERM_ACC
Termination current accuracy
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6.5 Electrical Characteristics (continued)
3.0V < VIN < VIN_OV and VIN > VOUT + VSLEEP, TJ = -40°C to +125°C, and TJ = 25°C for typical values (unless otherwise
noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
Output (OUT) short circuit voltage
rising threshold, for Li-Ion chemistry
VBAT_SHORT
OUT rising
OUT falling
2.1
2.2
2.3
V
Output (OUT) short circuit voltage
hysteresis
VBAT_SHORT_HYS
IBAT_SHORT
200
6
mV
mA
V
OUT short circuit charging current
VOUT < VBAT_SHORT
4
8
Pre-charge to fast-charge transition
threshold, for Li-Ion chemistry
VBAT_LOWV
OUT rising
2.7
2.8
100
100
845
845
3.0
VBAT_LOWV_HYS
VRECHG
Battery LOWV hysteresis
OUT falling
mV
Battery recharge threshold for Li-Ion
chemistry
OUT falling VREG_ACC - VOUT
VIN = 4.4V, IOUT = 300mA, TJ = 25°C
75
125 mV
1000
1450
mΩ
mΩ
RON
Charging path FET on-resistance
VIN = 4.4V, IOUT = 300mA, TJ = -40 -
125°C
BATTERY CHARGER PROTECTION
VOUT_OVP
VOUT_OVP
IOUT_OCP
OUT overvoltage rising threshold
VOUT rising, as percentage of VREG
VOUT falling, as percentage of VREG
IOUT rising
103
101
0.9
104
102
1
105
103
1.1
%
%
A
OUT overvoltage falling threshold
Output current limit threshold
TEMPERATURE REGULATION AND TEMPERATURE SHUTDOWN
Typical junction temperature
regulation
TREG
125
°C
Thermal shutdown rising threshold
Thermal shutdown falling threshold
Temperature increasing
150
135
°C
°C
TSHUT
Temperature decreasing
BATTERY-PACK NTC MONITOR
ITS_BIAS TS nominal bias current
36.5
0.99
0.83
38
1.04
0.88
39.5 µA
Cold temperature threshold
TS pin voltage rising (approx. 0°C)
TS pin voltage falling (approx. 4°C)
1.09
0.93
V
V
VCOLD
Cold temperature exit threshold
Normal to low temperature charge;
Charge current target reduced to 20% TS pin voltage rising (approx. 10°C)
x ISET
650
580
680
610
710 mV
640 mV
VCOOL
Low temperature to normal charge;
TS pin voltage falling (approx. 13°C)
Charge current target returns to ISET
Hot temperature threshold
TS pin voltage falling (approx. 45°C)
TS pin voltage rising (approx. 40°C)
176
208
188
220
200 mV
232 mV
VHOT
Hot temperature exit threshold
Charge Disable threshold. Crossing
this threshold shall shutdown IC
VTS_ENZ
TS pin voltage falling
40
50
60 mV
85 mV
Charge Enable threshold. Crossing
this threshold shall restart IC operation
VTS_EN
TS pin voltage rising
65
75
VTS_CLAMP
TS maximum voltage clamp
TS pin open-circuit (float)
2.3
2.6
2.9
V
LOGIC OUTPUT PIN (STAT)
VOL
Output low threshold level
High-level leakage current
Sink current = 5mA
Pull up rail 3.3V
0.4
1
V
IOUT_BIAS
µA
6.6 Timing Requirements
MIN
NOM
MAX
UNIT
BATTERY CHARGER
tTS_DUTY_ON
tTS_DUTY_OFF
TS turn-on time during TS duty cycle mode
TS turn-off time during TS duty cycle mode
100
2
ms
s
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MIN
NOM
100
30
MAX
UNIT
µs
tOUT_OCP_DGL
tPRECHG
Deglitch time for IOUT_OCP, IOUT rising
Pre-charge safety timer accuracy
Fast-charge safety timer accuracy
28.5
9.5
31.5
10.5
min
hr
tSAFETY
10
6.7 Typical Characteristics
CIN = 1 µF, COUT = 1 µF
1
0.8
0.6
0.4
0.2
0
1
0.8
0.6
0.4
0.2
0
-40°C
0°C
25°C
85°C
105°C
-40°C
0°C
25°C
85°C
105°C
-0.2
-0.4
-0.6
-0.8
-1
-0.2
-0.4
-0.6
-0.8
-1
4.5 4.7 4.9 5.1 5.3 5.5 5.7 5.9 6.1 6.3 6.5
VIN (V)
0
10
20
30
40
50
IOUT (mA)
60
70
80
90 100
IOUT = 20 mA
VOUT = 4.35 V
VIN = 5 V
VOUT = 4.35 V
图6-1. Line Regulation
图6-2. Load Regulation
10
8
10
8
6
6
4
4
2
2
0
0
10mA
50mA
-2
-4
-6
-8
-10
-2
-4
-6
-8
-10
100mA
200mA
400mA
600mA
800mA
10mA
50mA
100mA
200mA
300mA
3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9
VOUT (V)
4
4.1
-40
-20
0
20 40
Temperature (°C)
60
80 90
VIN = 5 V
Temp = 25ºC
VIN = 5 V
VOUT = 3.8 V
图6-3. ICHG Accuracy vs. VOUT
图6-4. ICHG Accuracy vs. Temperature
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6.7 Typical Characteristics (continued)
CIN = 1 µF, COUT = 1 µF
1
800
700
600
500
400
300
200
100
5VIN, 4.35VREG
-40°C
0°C
25°C
85°C
105°C
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
-40
-20
0
20 40
Temperature (°C)
60
80
100
0.25
0.3
0.35
0.4
0.45
IOUT (A)
0.5
0.55
0.6
0.65
图6-6. Dropout Voltage vs. Output Current
IOUT = 10 mA
图6-5. VSET Accuracy vs. Temperature
175
150
125
100
75
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
-40°C
0°C
25°C
85°C
105°C
-40°C
0°C
25°C
85°C
105°C
50
25
0
1
2
3
4
VIN (V)
5
6
7
4
4.5
5
5.5
6
6.5
VIN (V)
TS Pin = LOW
VOUT = 0 V
ICHG = 0 A
VOUT = 0 V
图6-7. Input Shutdown Current vs. Input Voltage
图6-8. Input Quiescent Current vs. Input Voltage
1
10
-40°C
0°C
25°C
85°C
105°C
-40°C
0°C
25°C
85°C
105°C
0.9
8
6
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
4
2
0
-2
-4
-6
-8
-10
1
2
3
VOUT (V)
4
5
0
10
20
30
40
ITERM SET (mA)
50
60
70
80
VIN = 0 V
VIN = 5V
VOUT = 4.35V
图6-9. Output Quiescent Current vs. Output Voltage
图6-10. Termination Current Accuracy vs. Termination Current
Setting
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7 Detailed Description
7.1 Overview
The BQ25175 is an integrated 800-mA linear charger for 1-cell Li-Ion/Li-Poly batteries. The device has a single
power output that charges the battery. The system load can be placed in parallel with the battery, as long as the
average system load does not prevent the battery from charging fully within the safety timer duration. When the
system load is placed in parallel with the battery, the input current is shared between the system and the battery.
The device has three phases for charging a Li-Ion/Li-Poly battery: precharge to recover a fully discharged
battery, fast-charge constant current to supply the bulk of the charge, and voltage regulation to reach full
capacity.
The charger includes flexibility in programming of the fast-charge current. This charger is designed to work with
a standard USB connection or dedicated charging adapter (DC output).
The charger also comes with a full set of safety features: battery temperature monitoring, overvoltage protection,
charge safety timers, and configuration pin (ISET) short and open protection. All of these features and more are
described in detail below.
The charger is designed for a single path from the input to the output to charge the battery. Upon application of a
valid input power source, the configuration pins are checked for short/open circuit.
If the battery voltage is below the VBAT_LOWV threshold, the battery is considered discharged and a
preconditioning cycle begins. The amount of precharge current is 20% of the programmed fast-charge current
via the ISET pin. The tPRECHG safety timer is active, and stops charging after expiration if battery voltage fails to
rise above VBAT_LOWV
.
Once the battery has charged to the VBAT_LOWV threshold, Fast Charge Mode is initiated, applying the fast
charge current and starting the tSAFETY timer. The fast charge constant current is programmed using the ISET
pin. The constant current phase provides the bulk of the charge. Power dissipation in the IC is greatest in fast
charge with a lower battery voltage. If the IC temperature reaches TREG, the IC enters thermal regulation, slows
the timer clock by half, and reduces the charge current as needed to keep the temperature from rising any
further. 图 7-1 shows the typical lithium battery charging profile with thermal regulation. Under normal operating
conditions, the IC junction temperature is less than TREG and thermal regulation is not entered.
Once the battery has charged to the regulation voltage, the voltage loop takes control and holds the battery at
the regulation voltage until the current tapers to the termination threshold. The termination threshold is 10% of
the programmed fast-charge current.
Further details are described in 节7.3.
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Thermal
Regulation
Phase
Current
Regulation
Phase
Voltage Regulation and
Charge Termination
Phase
Pre-
Conditioning
Phase
DONE
V
REG
I
CHG
Battery Current,
I
FAST-CHARGE
CURRENT
OUT
Battery
Voltage,
V
OUT
Charge
Complete
Status,
Charger
Off
PRE-CHARGE
CURRENT AND
TERMINATION
THRESHOLD
V
BAT_LOWV
I
TERM
I
PRECHG
T
REG
0A
Temperature, Tj
t
t
DONE
PRECHG
SAFETY
图7-1. Lithium-Ion Battery Charging Profile with Thermal Regulation
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7.2 Functional Block Diagram
OUT
IN
VBAT
ICHG
VIN
+
+
VREF
VIN_OV
VSLEEPZ
VIN_UVLOZ
ICHG_REF
VBAT_REF
INPUT
MONITOR
+
QBLK
CNTRL
TREG
TJ
/PG
CEN
FAULT
ISET
STAT
ICHG_REF
VBAT_REF
tSAFETY
TREG
PIN DETECT
&
REF DAC
STAT
ITERM
TJ
TERM
TJSHUT
TS HOT
+
+
+
+
+
+
+
+
+
+
ICHG
TSHUT
(VBAT_REF
- VRECHG
VTS_CLAMP
ITS
)
VHOT
VTS
RECHG
VBAT
TS
tCHARGE
tSAFETY
VTS
TMR_EXP
BATLOW
TS COLD
BATOVP
CHARGE
CONTROL
VTS
VCOLD
VBAT_LOWV
VBAT
VBAT
GND
VOUT_OVP
VBAT_SHORT
VBAT
ICHG
BATSHORT
FAULT
BATOCP
STAT
IOUT_OCP
STATE
MONITOR
BQ25175
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7.3 Feature Description
7.3.1 Device Power Up from Input Source
When an input source is plugged in and charge is enabled, the device checks the input source voltage to turn on
all the bias circuits. It detects and sets the charge current and charge voltage limits before the linear regulator is
started. The power up sequence from input source is as listed:
1. ISET pin detection
2. Charger power up
7.3.1.1 ISET Pin Detection
After a valid VIN is plugged in, the device checks the resistor on the ISET pin for a short circuit (RISET
<
RISET_SHORT). If a short condition is detected, the charger remains in the FAULT state until the input or TS pin is
toggled. If the ISET pin is open-circuit, the charger proceeds through pin detection and starts the charger with no
charge current. This pin is monitored while charging and changes in RISET while the charger is operating will
immediately translate to changes in charge current.
An external pulldown resistor (±1% or better is recommended to minimize charge current error) from the ISET
pin to GND sets the charge current as:
KISET
ICHG
=
RISET
(1)
where:
• ICHG is the desired fast-charge current
• KISET is a gain factor found in the electrical specifications
• RISET is the pulldown resistor from the ISET pin to GND
For charge currents below 50 mA, an extra RC circuit is recommended on ISET to achieve a more stable current
signal. For greater accuracy at lower currents, part of the current-sensing FET is disabled to give better
resolution.
7.3.1.2 Charger Power Up
After ISET pin resistor values have been validated, the device proceeds to enable the charger. The device
automatically begins operation at the correct stage of battery charging depending on the OUT voltage.
7.3.2 Battery Charging Features
When charge is enabled, the device automatically completes a charging cycle according to the setting on the
ISET pin without any intervention. The lithium-based charging cycle is automatically terminated when the
charging current is below termination threshold, charge voltage is above recharge threshold, and device is not in
thermal regulation (TREG). When a full battery is discharged below the recharge threshold (VRECHG), the device
automatically starts a new charging cycle. After charge is done, toggling the input supply or the TS pin can
initiate a new charging cycle.
7.3.2.1 Lithium-Ion Battery Charging Profile
The device charges a lithium based battery in four phases: trickle charge, precharge, constant current, and
constant voltage. At the beginning of a charging cycle, the device checks the battery voltage and regulates
current and voltage accordingly.
If the charger is in thermal regulation during charging, the actual charging current is less than the programmed
value. In this case, termination is temporarily disabled and the charging safety timer is counted at half the clock
rate. For more information, refer to 节7.3.2.3.
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Regulation Voltage
VREG
VRECHG
Battery Voltage
Charge Current
Charge
Current ISET
VBAT_LOWV
VBAT_SHORT
IPRECHG = ISET x 20%
ITERM = ISET x 10%
IBAT_SHORT
Trickle Charge
Pre-charge
Re-
charge
Fast-
Charge CC
Taper-
Charge CV
Charge
Done
Precharge Timer
(30min)
Safety
Timer (10hr)
图7-2. Battery Charging Profile
7.3.2.2 Charge Termination and Battery Recharge
The device terminates a charge cycle when the OUT pin voltage is above the recharge threshold (VRECHG) and
the current is below the termination threshold (ITERM). Termination is temporarily disabled when the charger
device is in thermal regulation. After charge termination is detected, the linear regulator turns off and the device
enters the STANDBY state. Once the OUT pin drops below the VRECHG threshold, a new charge cycle is
automatically initiated.
7.3.2.3 Charging Safety Timers
The device has built-in safety timers to prevent an extended charging cycle due to abnormal battery conditions.
The precharge timer is fixed at 30 minutes. The fast-charge safety timer is fixed at 10 hours. When the safety
timer expires, the charge cycle ends. A toggle on the input supply or TS pin is required to restart a charge cycle
after the safety timer has expired.
During thermal regulation, the safety timer counts at half the clock rate as the actual charge current is likely to be
below the ISET setting. For example, if the charger is in thermal regulation throughout the whole charging cycle
and the safety timer is 10 hours, then the timer will expire in 20 hours.
During faults which disable charging, such as VIN OVP, BAT OVP, TSHUT, or TS faults, the timer is suspended.
Once the fault goes away, charging and the safety timer resume. If the charging cycle is stopped and started
again, the timer gets reset (toggle of the TS pin restarts the timer).
The safety timer restarts counting for the following events:
1. Charging cycle stop and restart (toggle TS pin, charged battery falls below recharge threshold, or toggle
input supply)
2. OUT pin voltage crosses the VBAT_LOWV threshold in either direction
The precharge safety timer (fixed counter that runs when VOUT < VBAT_LOWV), follows the same rules as the fast-
charge safety timer in terms of getting suspended, reset, and counting at half-rate.
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7.3.2.4 Battery Cold, Hot Temperature Qualification (TS Pin)
While charging, the device continuously monitors battery temperature by sensing the voltage at the TS pin. A
negative temperature coefficient (NTC) thermistor should be connected between the TS and GND pins
(recommend: 103AT-2). If temperature sensing is not required in the application, connect a fixed 10-kΩ resistor
from TS to GND to allow normal operation. Battery charging is allowed when the TS pin voltage falls between
the VCOLD and VHOT thresholds (typically 0°C to 45°C). Charging current is reduced to 20% of the programmed
ISET value when VCOLD > TS > VCOOL (typically 0°C to 10°C). The charging profile can be seen in 图7-3.
ISET
VREG
20% x ISET
0°C 10°C
45°C
60°C
图7-3. BQ25175 Charging Profile
If the TS pin indicates battery temperature is outside this range, the device stops charging, enters the STANDBY
state, and blinks the STAT pin. Once battery temperature returns to normal conditions, charging resumes
automatically.
In addition to battery temperature sensing, the TS pin can be used to disable the charger at any time by pulling
TS voltage below VTS_ENZ. The device disables the charger and consumes ISD_IN_TS from the input supply. In
order to minimize quiescent current, the TS current source (ITS_BIAS) is duty-cycled, with an on time of
tTS_DUTY_ON and an off time of tTS_DUTY_OFF. After the TS pin pulldown is released, the device may take up to
tTS_DUTY_OFF to turn the ITS_BIAS back on. After the source is turned on, the TS pin voltage will go above VTS_EN
,
and re-enable the charger operation. The device treats this TS pin toggle as an input supply toggle, triggering a
device power up from input source (see 节7.3.1).
7.3.3 Status Outputs (STAT)
7.3.3.1 Charging Status Indicator (STAT)
The device indicates the charging state on the open-drain STAT pin. This pin can drive an LED.
表7-1. STAT Pin State
CHARGING STATE
STAT PIN STATE
HIGH
Charge completed, charger in Sleep mode or charge disabled (VTS
<
VTS_ENZ
)
Charge in progress (including automatic recharge)
LOW
Fault (VIN OVP, BAT OVP, BAT OCP, TS HOT, TS COLD, TMR_EXP,
or ISET pin short)
BLINK at 1 Hz
7.3.4 Protection Features
The device closely monitors input and output voltages, as well as internal FET current and temperature for safe
linear regulator operation.
7.3.4.1 Input Overvoltage Protection (VIN OVP)
If the voltage at the IN pin exceeds VIN_OV, the device turns off after a deglitch, tVIN_OV_DGL. The safety timer
suspends counting and the device enters Standby mode. Once the IN voltage recovers to a normal level, the
charge cycle and the safety timer automatically resume operation.
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7.3.4.2 Output Overvoltage Protection (BAT OVP)
If the voltage at the OUT pin exceeds VOUT_OVP, the device immediately stops charging. The safety timer
suspends counting and the device enters Standby mode. Once the OUT voltage recovers to a normal level, the
charge cycle and the safety timer resume operation.
7.3.4.3 Output Overcurrent Protection (BAT OCP)
During normal operation, the OUT current should be regulated to the ISET programmed value. However, if a
short circuit occurs on the ISET pin, the OUT current may rise to an unintended level. If the current at the OUT
pin exceeds IOUT_OCP, the device turns off after a deglitch, tOUT_OCP_DGL. The safety timer resets the count, and
the device remains latched off. An input supply or TS pin toggle is required to restart operation.
IOUT_OCP
ICHG
tOUT_OCP_DGL
RISET
Short Circuit
event on ISET
Charger
latched off
图7-4. Overcurrent Protection
7.3.4.4 Thermal Regulation and Thermal Shutdown (TREG and TSHUT)
The device monitors its internal junction temperature (TJ) to avoid overheating and to limit the IC surface
temperature. When the internal junction temperature exceeds the thermal regulation limit, the device
automatically reduces the charge current to maintain the junction temperature at the thermal regulation limit
(TREG). During thermal regulation, the actual charging current is usually below the programmed value on the
ISET pin.
Therefore, the termination comparator for the Lithium-Ion battery is disabled, and the safety timer runs at half the
clock rate.
Additionally, the device has thermal shutdown to turn off the linear regulator when the IC junction temperature
exceeds the TSHUT threshold. The charger resumes operation when the IC die temperature decreases below
the TSHUT falling threshold.
7.4 Device Functional Modes
7.4.1 Shutdown or Undervoltage Lockout (UVLO)
The device is in the shutdown state if the IN pin voltage is less than VIN_LOWV or the TS pin is below VTS_ENZ
.
The internal circuitry is powered down, all the pins are high impedance, and the device draws ISD_IN_TS from the
input supply. Once the IN voltage rises above the VIN_LOW threshold and the TS pin is above VTS_EN, the IC
enters Sleep mode or Active mode depending on the OUT pin voltage.
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7.4.2 Sleep Mode
The device is in Sleep mode when VIN_LOWV < VIN < VOUT + VSLEEPZ . The device waits for the input voltage to
rise above VOUT + VSLEEPZ to start operation.
7.4.3 Active Mode
The device is powered up and charges the battery when the TS pin is above VTS_ENZ and the IN voltage ramps
above both VIN_LOWV and VOUT + VSLEEPZ. The device draws IQ_IN from the supply to bias the internal circuitry.
For details on the device power-up sequence, refer to 节7.3.1.
7.4.3.1 Standby Mode
The device is in Standby mode if a valid input supply is present and charge is terminated or if a recoverable fault
is detected. The internal circuitry is partially biased, and the device continues to monitor for either VOUT to drop
below VRECHG or the recoverable fault to be removed.
7.4.4 Fault Mode
The fault conditions are categorized into recoverable and nonrecoverable as follows:
• Recoverable, from which the device should automatically recover once the fault condition is removed:
– VIN OVP
– BAT OVP
– TS HOT
– TS COLD
• Nonrecoverable, requiring pin or input supply toggle to resume operation:
– BAT OCP
– ISET pin short detected
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8 Application and Implementation
Note
以下应用部分中的信息不属于TI 器件规格的范围,TI 不担保其准确性和完整性。TI 的客 户应负责确定
器件是否适用于其应用。客户应验证并测试其设计,以确保系统功能。
8.1 Application Information
A typical application consists of the device configured as a standalone battery charger for single-cell Li-Ion or Li-
Poly chemistries. The charge current is configured using a pulldown resistor on the ISET pin. A battery
thermistor can be connected to the TS pin to allow the device to monitor battery temperature and control
charging. Pulling the TS pin below VTS_ENZ disables the charging function. Charger status is reported via the
STAT pin.
8.2 Typical Applications
8.2.1 Li-Ion Charger Design Example
VIN: 3.0V – 6.6V
IN
OUT
1s Li-Ion
1µF
System
Load
1µF
1k
10k
ISET
GND
STAT
TS
BQ25175
图8-1. BQ25175 Typical Application for 1s Li-Ion Charging at 100 mA
8.2.1.1 Design Requirements
• Input supply up-to 6.6 V
• Battery is 1-cell Li-ion
• Fast charge current: ICHG = 300 mA
• Charge voltage: VREG = 4.35 V
• Termination current: ITERM = 10% of ICHG or 30 mA
• Precharge current: IPRECHG = 20% of ICHG or 60 mA
• TS –Battery temperature sense = 10-kΩNTC (103AT)
– Charging allowed between battery temperatures of 0ºC to 45ºC, with charge current reduction (IOUT = 20%
x ISET) between 0ºC and 10ºC
• TS pin can be pulled low to disable charging or left floating to enable charging
8.2.1.2 Detailed Design Procedure
Regulation voltage is fixed to 4.35 V, input voltage is 5 V, and charge current is programmed via the ISET pin to
300 mA.
RISET = [KISET / ICHG
]
from the Electrical Characteristics table KISET = 300 AΩ
RISET = [300 AΩ/0.3 A] = 1000 Ω
8.2.1.2.1 TS Function
Use a 10-kΩ NTC thermistor in the battery pack (recommend: 103AT-2). The VCOLD and VHOT thresholds in this
data sheet are designed to meet a charging window between 0°C and 45°C for a 10-kΩ NTC with β = 3435 K.
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To disable the TS sense function, use a fixed 10-kΩ resistor between the TS pin and GND. The TS pin can be
pulled down to disable charging.
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8.2.1.3 Application Curves
CIN = 1 µF, COUT = 1 µF, VIN = 5 V, ICHG = 200 mA (unless otherwise specified)
OUT = open-circuit
RISET = 1.2 kΩ
RISET = 1.2 kΩ
图8-3. Power Up without Battery
图8-2. Power Up with Battery
TS pulled LOW
VIN = 5V →0V
图8-5. Charge Disable
图8-4. Power Down
TS pin released
图8-7. IN OVP Response
图8-6. Charge Enable
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VOUT = VREG = 3.5 V →0 V
ISET = 1.5 kΩ→0 Ω
图8-8. OUT Short-Circuit Response
图8-9. ISET Short-Circuit Response
图8-11. TS Change Response
ISET = 400 mA →40 mA
图8-10. ISET Change Response
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9 Power Supply Recommendations
The device is designed to operate from an input voltage supply range between 3.0 V and 6.6 V (up to 30 V
tolerant) and current capability of at least the maximum designed charge current. If located more than a few
inches from the IN and GND pins, a larger capacitor is recommended.
10 Layout
10.1 Layout Guidelines
To obtain optimal performance, the decoupling capacitor from the IN pin to the GND pin and the output filter
capacitor from the OUT pin to the GND pin should be placed as close as possible to the device, with short trace
runs to both IN, OUT, and GND.
• All low-current GND connections should be kept separate from the high-current charge or discharge paths
from the battery. Use a single-point ground technique incorporating both the small signal ground path and the
power ground path.
• The high current charge paths into the IN pin and from the OUT pin must be sized appropriately for the
maximum charge current in order to avoid voltage drops in these traces.
10.2 Layout Example
OUT
IN
ISET
OUT
IN
TS
ISET
GND
STAT
0402
S
STAT
0402
GND
0402
0402
GND
图10-1. BQ25175 Board Layout Example
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11 Device and Documentation Support
11.1 Device Support
11.1.1 第三方产品免责声明
TI 发布的与第三方产品或服务有关的信息,不能构成与此类产品或服务或保修的适用性有关的认可,不能构成此
类产品或服务单独或与任何TI 产品或服务一起的表示或认可。
11.2 接收文档更新通知
要接收文档更新通知,请导航至 ti.com 上的器件产品文件夹。点击订阅更新 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。
11.3 支持资源
TI E2E™ 支持论坛是工程师的重要参考资料,可直接从专家获得快速、经过验证的解答和设计帮助。搜索现有解
答或提出自己的问题可获得所需的快速设计帮助。
链接的内容由各个贡献者“按原样”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》。
11.4 Trademarks
TI E2E™ is a trademark of Texas Instruments.
所有商标均为其各自所有者的财产。
11.5 Electrostatic Discharge Caution
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled
with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may
be more susceptible to damage because very small parametric changes could cause the device not to meet its published
specifications.
11.6 术语表
TI 术语表
本术语表列出并解释了术语、首字母缩略词和定义。
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12 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
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重要声明和免责声明
TI 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保。
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安全、安保或其他要求。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、成本、损失和债务,TI 对此概不负责。
TI 提供的产品受TI 的销售条款(https:www.ti.com/legal/termsofsale.html) 或ti.com 上其他适用条款/TI 产品随附的其他适用条款的约束。TI
提供这些资源并不会扩展或以其他方式更改TI 针对TI 产品发布的适用的担保或担保免责声明。重要声明
邮寄地址:Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2021,德州仪器(TI) 公司
PACKAGE OUTLINE
YBG0006
DSBGA - 0.5 mm max height
SCALE 13.000
DIE SIZE BALL GRID ARRAY
A
B
E
BALL A1
CORNER
D
0.5 MAX
C
SEATING PLANE
0.05 C
0.20
0.14
BALL TYP
0.4
TYP
C
0.8
TYP
SYMM
B
0.4 TYP
A
0.27
0.23
C A B
1
2
6X
0.015
SYMM
4224328/A 05/2018
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.
www.ti.com
EXAMPLE BOARD LAYOUT
YBG0006
DSBGA - 0.5 mm max height
DIE SIZE BALL GRID ARRAY
(0.4) TYP
6X ( 0.23)
1
2
A
(0.4) TYP
SYMM
B
C
SYMM
LAND PATTERN EXAMPLE
EXPOSED METAL SHOWN
SCALE: 50X
0.05 MIN
0.05 MAX
METAL UNDER
SOLDER MASK
(
0.23)
METAL
(
0.23)
EXPOSED
METAL
SOLDER MASK
OPENING
EXPOSED
METAL
SOLDER MASK
OPENING
SOLDER MASK
DEFINED
NON-SOLDER MASK
DEFINED
(PREFERRED)
SOLDER MASK DETAILS
NOT TO SCALE
4224328/A 05/2018
NOTES: (continued)
3. Final dimensions may vary due to manufacturing tolerance considerations and also routing constraints.
See Texas Instruments Literature No. SNVA009 (www.ti.com/lit/snva009).
www.ti.com
EXAMPLE STENCIL DESIGN
YBG0006
DSBGA - 0.5 mm max height
DIE SIZE BALL GRID ARRAY
(0.4) TYP
(R0.05) TYP
6X ( 0.25)
2
1
A
(0.4) TYP
SYMM
B
C
METAL
TYP
SYMM
SOLDER PASTE EXAMPLE
BASED ON 0.1 mm THICK STENCIL
SCALE: 50X
4224328/A 05/2018
NOTES: (continued)
4. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release.
www.ti.com
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