MAX15103EWL+ [MAXIM]
Adjustable Positive LDO Regulator, 0.6V Min, 5.2V Max, 0.2V Dropout, BICMOS, PBGA15, 1.60 X 2.70 MM, ROHS COMPLIANT, WLP-15;
| 型号： | MAX15103EWL+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Adjustable Positive LDO Regulator, 0.6V Min, 5.2V Max, 0.2V Dropout, BICMOS, PBGA15, 1.60 X 2.70 MM, ROHS COMPLIANT, WLP-15 稳压器 |
| 文件： | 总22页 (文件大小：3140K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-6023; Rev 0; 9/11
备 有 评 估 板
概述
特性
MAX15103是小尺寸、低压差线性稳压器，优化用于网络、
数据通信以及服务器等领域。1.7V至5.5V输入电压范围内，
稳压器可提供高达3A的输出电流，并保持 1.6%的输出精
度。输出电压可稳定在低至0.6V，保证整个负载范围内压
差小于200mV。折返式限流和热关断保护有效保障内部p
沟道开关安全工作。
S 1.7V至5.5V工作电压范围
S 输出3A电流时，保证200mV压差
S 在输入电压、负载和温度变化范围内，保持 1.6%输出
精度
S 输出电压可调：0.6V至5.2V
S 折返式限流保护
MAX15103提供外部旁路输入，以降低噪声。输入旁路也
可用于软启动控制。器件还包括使能输入和电源就绪输出，
用于电源排序控制。
S 热关断保护
-
°
MAX15103采用1.6mm x 2.7mm WLP封装，工作在 40 C
S 低噪声：15µVRMS (典型值)
S 1.6mm × 2.7mm小尺寸WLP封装
+
°
至 85 C温度范围
应用
定购信息在数据资料的最后给出。
网络
电信/数据通信
相关型号以及配合该器件使用的推荐产品，请参见：china.maxim-
ic.com/MAX15103.related。
服务器
基站
PLL电源
典型工作电路
INPUT
(1.7V TO 5.5V)
OUTPUT
(0.6V TO V - 200mV)
IN
IN
OUT
MAX15103
C
22µF
C
2.2µF
OUT
IN
R1
0 TO 4.6kI
EN
PG
FB
POWER-GOOD
OUTPUT
R2
600I
GND
SS_BYP
C
SS
100nF
ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ Maxim Integrated Products
本文是英文数据资料的译文，文中可能存在翻译上的不准确或错误。如需进一步确认，请在您的设计中参考英文资料。
1
有关价格、供货及订购信息，请联络Maxim亚洲销售中心：10800 852 1249 (北中国区)，10800 152 1249 (南中国区)，
或访问Maxim的中文网站：china.maxim-ic.com。
MAX15103
小尺寸、3A、低压差线性稳压器，
2.7mm x 1.6mm封装
Absolute MAxiMuM RAtings
IN, EN, PG, SS_BYP, FB to GND ...........................-0.3V to +6V
Operating Temperature Range ........................ -40NC to +85NC
Storage Temperature Range ......................... -65NC to +150NC
Junction Temperature ....................................................+150NC
Soldering Temperature (reflow) (Note 1) ........................+260NC
OUT to GND...............................................-0.3V to (V + 0.3V)
OUT Short Circuit ......................................................Continuous
IN
Continuous Power Dissipation (T = +70NC)
A
WLP (derate 19.2mW/NC above +70NC)....................1538mW
nꢁꢂꢃ 1: The WLP package is constructed using a unique set of package techniques that impose a limit on the thermal profile. The
device can be exposed during board-level solder attach and rework. This limit permits only the use of the solder profiles
recommended in the industry-standard specification JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection
reflow. Preheating is required. Hand or wave soldering is not allowed.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
PAꢉkAge tꢊeRMAl ꢉꢊARAꢉteRistiꢉs (nꢁꢂꢃ 2)
WLP
Junction-to-Ambient Thermal Resistance (q ) ..........30°C/W
JA
nꢁꢂꢃ 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to chꢄꢅa.maꢆꢄm-ꢄc.cꢁm/ꢂhꢃrmaꢇ-ꢂꢈꢂꢁrꢄaꢇ.
eleꢉtRiꢉAl ꢉꢊARAꢉteRistiꢉs
(V = 3.3V, V
= 1.5V, V
= V , I
= 100mA, C = 2.2µF, C
= 22µF, T = T = -40NC to +85NC, typical values are at
OUT A J
IN
OUT
EN
IN OUT
IN
T
= +25NC, unless otherwise noted.) (Note 3)
A
PARAMeteR
sYMbol
ꢉonDitions
Min
tYP
MAx
units
in
Input Voltage Range
V
1.7
5.5
V
V
IN
Input Undervoltage Lockout
V
V
rising
1.624
40
1.69
IN_UV
IN
Input Undervoltage Lockout
Hysteresis
V
mV
IN_UV_HYS
out
Output Voltage Range
Load Regulation
V
0.6
5.2
V
OUT
I
= 30mA to 3A
0.1
%/A
OUT
V
= 1.7V to 5.5V, V
= 190mA
= 0.6V,
IN
OUT
Line Regulation
-0.15
+0.15
200
%/V
I
OUT
Dropout Voltage
I
= 3A, V = 580mV (Note 4)
65
mV
A
OUT
FB
In-Regulation Current Limit
V
V
V
= 5.5V, V = 500mV
3.7
IN
IN
IN
FB
Short-Circuit Foldback Current
Limit
= 5.5V, V
= 0V, V < 100mV
1.8
A
OUT
OUT
FB
= 5.5V, V
= 0V, V = 0V,
EN
Output Shutdown Leakage
100
250
FA
T = 0NC to +85NC
A
V
= 5.5V, V
= 0V, V = 0V,
IN
OUT EN
Output Shutdown Leakage
Line Transient
FA
T = -40NC to +85NC
A
DV = 0.5V, t
= t = 5Fs
FALL
2
%
IN
RISE
ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ Maxim Integrated Products
2
MAX15103
小尺寸、3A、低压差线性稳压器，
2.7mm x 1.6mm封装
eleꢉtRiꢉAl ꢉꢊARAꢉteRistiꢉs (cꢁꢅꢂꢄꢅꢈꢃd)
(V = 3.3V, V
= 1.5V, V
= V , I
= 100mA, C = 2.2µF, C
= 22µF, T = T = -40NC to +85NC, typical values are at
IN
OUT
EN
IN OUT
IN
OUT
A
J
T
= +25NC, unless otherwise noted.) (Note 3)
A
PARAMeteR
sYMbol
ꢉonDitions
Min
tYP
1.3
40
MAx
units
%
I
t
= 100mA to 1A to 100mA,
OUT
RISE
Load Transient
Power-Supply Rejection
Output Voltage Noise
Fb
= t
= 1Fs
FALL
Frequency = 100kHz, I
= 500mA
dB
OUT
Frequency = 500Hz to 100kHz,
15
FV
RMS
I
= 100mA
OUT
I
V
= 190mA, V
= 1.5V to 5V,
OUT
OUT
593
590
600
606
= (V
+ 0.3V) to 5.5V
IN
OUT
FB Threshold Accuracy
mV
I
V
= 3mA to 3A, V
= 1.5V to 5V,
OUT
OUT
610
1
= (V
+ 0.3V) to 5.5V
IN
OUT
FB Input Current
V
= 0.6V, V = 5.5V
FA
FB
IN
gnD
Ground Supply Current
Ground Shutdown Current
PoWeR-gooD outPut
I
= 3A
1.8
3.5
1
mA
OUT
V
= 1.7V to 5.5V
FA
IN
FB = high
FB = low
638
538
650
550
662
562
V
moving out of
FB
Power-Good (PG) Threshold
mV
mV
regulation, V
= 15mV
HYS
Power-Good (PG) Output-
Voltage Low
I
= 2mA (sink)
25
80
PG
Power-Good (PG) Delay
Power-Good (PG) Leakage
enAble
100
Fs
V
= 5.5V
1
FA
PG
Enable Input High Threshold
Enable Input Low Threshold
Enable Input Bias Current
soFt-stARt
V
1.2
V
V
EN_HIGH
V
0.4
+1
EN_LOW
V
= 0 to 5.5V
-1
8
FA
EN
Soft-Start Charging Current
V
V
= 100mV
SS_BYP
9.2
45
12
FA
SS_BYP
I
Soft-Start Pulldown Resistance
tꢊeRMAl sꢊutDoWn
= 0V, I
= 2mA
100
EN
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
+160
15
NC
NC
Threshold falling
nꢁꢂꢃ 3: All devices 100% production tested at T = +25°C. Limits over the temperature range are guaranteed by design.
A
nꢁꢂꢃ 4: Dropout is defined as V - V
when V
falls 3% below its nominal voltage value.
IN
OUT
OUT
ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ Maxim Integrated Products
3
MAX15103
小尺寸、3A、低压差线性稳压器，
2.7mm x 1.6mm封装
典型工作特性
(V = 1.8V, V
IN
= 1.5V, T = +25NC, unless otherwise noted.)
A
OUT
OUTPUT VOLTAGE ERROR
vs. OUTPUT CURRENT
DROPOUT VOLTAGE
vs. OUTPUT CURRENT
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
80
0.10
0.05
0
1.515
1.510
1.505
1.500
1.495
1.490
1.485
DEFINED V - V
WHEN V
NOMINAL
IN OUT
OUT
I
= 0.5A
OUT
FALLS 2%
70
60
50
40
30
20
10
0
V
= 2.5V
OUT
V
= 3V
OUT
V
= 1.8V
OUT
V
OUT
= 3.3V
V
= 1.5V
OUT
V
= 2.5V
2.5
OUT
-0.05
-0.10
V
= 5V
OUT
0
0.5
1.0
1.5
2.0
2.5
3.0
0
0.5
1.0
1.5
2.0
3.0
1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
INPUT VOLTAGE (V)
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
OUTPUT VOLTAGE
vs. TEMPERATURE
SOFT-START TIME
vs. CAPACITOR VALUE
STARTUP WAVEFORMS
MAX15103 toc05
1.500
1.498
1.496
1.494
1.492
1.490
1.488
1.486
1.484
1.482
1.480
10
9
8
7
6
5
4
3
2
1
0
C
SS
=100nF
V
EN
1V/div
NO LOAD
I
IN
2A/div
V
OUT
1V/div
3A LOAD
2A LOAD
1A LOAD
V
PG
1V/div
-40
-15
10
35
60
85
1ms/div
5
25
45
65
85
100
TEMPERATURE (°C)
CAPACITOR VALUE (nF)
FB VOLTAGE vs. TEMPERATURE
1A LOAD-TRANSIENT RESPONSE
(V
= 1.5V)
OUT
MAX15103 toc08
0.600
0.599
0.598
0.597
0.596
0.595
0.594
0.593
0.592
0.591
NO LOAD
1A LOAD
V
OUT
AC-COUPLED
50mV/div
2A LOAD
3A LOAD
1A
I
OUT
500mA/div
100mA
-40
-15
10
35
60
85
40µs/div
TEMPERATURE (°C)
ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ Maxim Integrated Products
4
MAX15103
小尺寸、3A、低压差线性稳压器，
2.7mm x 1.6mm封装
典型工作特性(续)
(V = 1.8V, V
= 1.5V, T = +25NC, unless otherwise noted.)
IN
OUT
A
3A LOAD-TRANSIENT RESPONSE
2A LOAD-TRANSIENT RESPONSE
MAX15103 toc10
MAX15103 toc09
V
OUT
V
OUT
AC-COUPLED
50mV/div
AC-COUPLED
50mV/div
3A
2A
I
I
OUT
OUT
1A/div
1A/div
100mA
100mA
40µs/div
40µs/div
GROUND CURRENT
vs. INPUT VOLTAGE
LINE-TRANSIENT RESPONSE
FOLDBACK CURRENT-LIMIT WAVEFORMS
MAX15103 toc11
MAX15103 toc12
3.0
2.5
2.0
1.5
1.0
0.5
0
I
= 1A
LOAD
2.3V
V
OUT
500mV/div
V
IN
I
I
= 1A
= 0A
LOAD
200mV/div
1.8V
I
OUT
V
OUT
2A/div
LOAD
AC-COUPLED
20mV/div
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
100µs/div
100µs/div
NOISE DENSITY
PSRR vs. FREQUENCY
SHORT-CIRCUIT WAVEFORMS
(I
LOAD
= 100mA)
(I
LOAD
= 0.5A)
MAX15103 toc14
MAX15103 toc15
18
15
12
9
V
IN
3.3V
90
80
70
60
50
40
30
20
10
2V/div
NO C
SS
V
OUT
C
= 4.7nF
SS
1V/div
I
OUT
5A/div
C
= 100nF
SS
6
V
PG
2V/div
3
200µs/div
10Hz
100kHz 1MHz
100
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY
ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ Maxim Integrated Products
5
MAX15103
小尺寸、3A、低压差线性稳压器，
2.7mm x 1.6mm封装
焊球配置
TOP VIEW
MAX15103
1
2
3
4
5
+
A
EN
IN
PG
IN
GND
IN
SS_BYP
IN
FB
IN
B
C
OUT
OUT
OUT
OUT
OUT
WLP
焊球说明
焊球
A1
名称
EN
功能
高电平有效使能输入。EN驱动为逻辑高电平时，使能LDO；将其连接至IN引脚，始终保持工作状态。
A2
PG
电源就绪输出。输出电压处于稳压范围以内时，该引脚为高电平开漏输出。
地。
A3
GND
SS_BYP旁路/软启动输入。在SS_BYP和GND之间连接陶瓷电容，以降低输出噪声，也可设置软启动
时间。
A4
A5
SS_BYP
FB
反馈输入。在OUT和GND之间连接电阻分压器，设置输出电压。
B1, B2, B3,
B4, B5
IN
电源电压输入。接1.7V至5.5V电源电压，使用2.2μF或更大的陶瓷电容将IN旁路至GND。
C1, C2, C3,
C4, C5
OUT
稳压输出。在OUT和GND之间连接22μF电容，为了获得更好的负载瞬态性能，可以使用较大电容。
ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ Maxim Integrated Products
6
MAX15103
小尺寸、3A、低压差线性稳压器，
2.7mm x 1.6mm封装
功能框图
SS_BYP
IN
UNDERVOLTAGE
LOCKOUT
THERMAL-
OVERLOAD
PROTECTION
ERROR
AMPLIFIER
0.60V
0.55V
0.65V
g
M
REF
P
EN
SHUTDOWN
LOGIC
I
LIM
OUT
FB
GND
PG
MAX15103
PG
CIRCUITRY
N
极驱动电流，较大的负载电流流过晶体管(较大压差)将产
生很大功耗。MAX15103调整管导通压降极小，即使在满
负荷下，也仅消耗1.8mA的静态电流。
详细说明
MAX15103是小尺寸、低压差线性稳压器，优化用于服务
器、网络和电信设备。稳压器可以从1.7V至5.5V的输入电
源产生输出精度为 1.6%、电流高达3A的稳压输出。输出
电压可调节至最低0.6V，满载时压差小于200mV。内部p
沟道开关带有折返式限流和热关断保护。
选择输出电压
MAX15103提供可调节输出。在FB端接外部分压电阻，可
+
将输出电压设置在 0.6V至VIN - 200mV (参见典型工作电
路)。参考下式设置输出电压：
MAX15103提供外部旁路输入，以降低噪声。该旁路输入也
可作为软启动控制。使能输入和电源就绪输出可以用于电
源排序控制。
VOUT = VFB (1 + R1/R2)
式中，V = +600mV。
FB
为便于电阻选择，将公式转化为：
R1 = R2 (VOUT/VFB - 1)
设置R2为600Ω。
内部p沟道调整管
MAX15103内置3A p沟道MOSFET调整管，与pnp调整管
设计不同的是：p沟道功率管的栅极驱动电流非常低。负
载较重时，PNP型调整管处于饱和状态，并需要较高的基
ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ Maxim Integrated Products
7
MAX15103
小尺寸、3A、低压差线性稳压器，
2.7mm x 1.6mm封装
°
式中，(TJ(MAX) - TA)为所允许的最大管芯温度(+150 C)与
使能
在EN引脚施加逻辑低电平时，禁止MAX15103工作。关断
时，调整管、控制电路、基准和所有偏置电路关断，电源
+
°
+
°
周围环境温度之差，图1所示为典型PCB在 25 C、 50 C
+
°
和 70 C环境温度下所允许的功耗(参考MAX15103评估
板)。
μ
电流降至1 A (典型值)；将EN连接至IN端，器件正常工作。
关断时，通过内部下拉电阻对软启动电容放电。
应用信息
软启动
如典型工作电路所示，MAX15103使用一个gM级电路和集
成电容CSS控制稳压器的反馈设置。EN驱动为低电平时，
软启动电容放电。EN驱动为高电平时或器件上电时，以
电容选择和稳压器稳定性
MAX15103的输入和输出需要外部电容，在IN和GND之间
μ
μ
连接至少2.2 F电容(CIN)；在OUT和GND之间连接22 F电
μ
9.2 A恒流对软启动电容充电。器件启动时，反馈设置点
μ
容(COUT)，负载电流较小时(例如1A)可以使用10 F电容。
的电压线性增加，从而降低电源的浪涌电流。
采用具有低等效串联电阻(ESR)的表贴陶瓷电容即可满足
要求。电路板布线应确保输入、输出引线至少为2.5mm宽，
在IC的6mm范围以内放置CIN和COUT，将PCB引线电感降
至最低。
tSS = 6.315 x 10-5 x CSS
式中，CSS单位为nF。采用30nF至100nF电容，电压额定
值大于5V。
输出电容的ESR会影响稳定性和输出噪声。使用ESR为50mΩ
或更低的电容，确保器件稳定工作的同时，具有最佳的瞬
态响应，特别是对于极低输出电压(< 2V)、较大输出电流(>
0.5A)的应用。
因为缓慢变化的电压作用到限流比较器，输出电压的实际
爬升时间取决于负载电流和输出电容。SS_BYP保持浮空，
禁止软启动。
折返限流
输出电压在稳压范围以内时，MAX15103的电流门限为
3.7A。输出电压降至标称值的17%时，电流门限按指数规
律折返下降到1.8A。输出可以不受时间限制地对地短路，
不会损坏器件。避免输出电流连续大于3A，从而防止稳压
器损坏。
由于一些电容的电介质随偏置电压和温度发生变化，选择
器件时，请查阅电容制造商提供的技术规格，确保电容在
任何工作电压和温度范围内均符合这些要求。
3.5
3.0
热过载保护
热过载保护电路用于限制MAX15103内部的总功耗。结温
2.5
+
°
超过TJ = 160 C时，温度传感器关断调整管，使IC冷却。
°
一旦IC结温下降大约15 C，温度传感器将重新开启调整管。
T
= +25NC
A
2.0
1.5
1.0
0.5
所以，发生连续短路时，输出为折返式限流输出。
热过载保护设计可在故障条件下有效保护MAX15103。连
续工作时，结温不得超过额定值TJ = 125 C。
T
A
= +50NC
+
°
T
A
= +70NC
工作区域和功耗
器件的整体功耗为P = IOUT (VIN - VOUT)，最大功耗为：
T = +125NC (BASED ON MAX15103 EV KIT)
J
0
PMAX = [(TJ(MAX) - TA)/(BJA)]
0
1
2
3
4
5
INPUT-OUTPUT DIFFERENTIAL VOLTAGE (V)
图1. 最大输出电流曲线
ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ Maxim Integrated Products
8
MAX15103
小尺寸、3A、低压差线性稳压器，
2.7mm x 1.6mm封装
定购信息
输入-输出电压(压差)
稳压器的最小输入-输出电压之差(压差)决定了所允许的最
低工作电压。压差是稳压器调整管的RDS(ON)与额定负载电
流的乘积。MAX15103的RDS(ON)为20mΩ，输出3A电流时，
对应的压差为60mV (参见Electrical Characteristics和典型
工作特性中的压差与输出电流关系曲线)。
PARt
teMP RAnge
Pin-PAꢉkAge
MAX15103EWL+
-40NC to +85NC
15 WLP
+表示无铅(Pb)/符合RoHS标准的封装。
噪声、PSRR和瞬态响应
MAX15103设计具有低压差特性，同时还保持了良好的噪
声、瞬态响应和交流抑制指标。工作在嘈杂环境时，可通
过增大输入、输出电容改善电源噪声抑制比和瞬态响应。
芯片信息
PROCESS: BiCMOS
µ
MAX15103的输出噪声典型值为15 VRMS (参见典型工作
特性中的噪声密度图)。
PCB布局散热考虑
封装信息
如需最近的封装外形信息和焊盘布局(占位面积)，请查询china.
maxim-ic.com/packages。请注意，封装编码中的“+”、“#”
或“-”仅表示RoHS状态。封装图中可能包含不同的尾缀字符，
但封装图只与封装有关，与RoHS状态无关。
封装的额定耗散功率在很大程度上依赖于稳压器下方的
覆铜面积。封装所允许的最大耗散功率为1538mW (通过
MAX15103评估板测得)。
如果PCB布局时注意散热，封装还可耗散更大功率。例如，
使用顶层覆铜和底层覆铜作为散热器，并通过过孔连接到
电路板中间层(GND)，将封装的热量有效传导到PCB板，
降低MAX15103在大功率下的结温。此外，还可以去除顶
层、底层IC周围的阻焊层，从而将热量直接释放到空气中。
IC允许的最大功耗计算如下：
封装类型
封装编码
外形编号
焊盘布局编号
参见
应用笔记1891
15 WLP
W151B2+1
21-0205
PMAX = [(TJ(MAX) - TA)/(BJA)]
+
°
式中，(TJ(MAX) - TA)是所允许的最大管芯温度( 150 C)与
周围环境的温差。
MAX15103评估板提供了布局示例，供用户参考。
ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ Maxim Integrated Products
9
MAX15103
小尺寸、3A、低压差线性稳压器，
2.7mm x 1.6mm封装
修订历史
修订号
修订日期
说明
修改页
0
9/11
最初版本。
—
Maxim北京办事处
北京8328信箱 邮政编码100083
免费电话：800 810 0310
电话：010-6211 5199
传真：010-6211 5299
Maxim不对Maxim产品以外的任何电路使用负责，也不提供其专利许可。Maxim保留在任何时间、没有任何通报的前提下修改产品资料和规格的权利。电气
特性表中列出的参数值(最小值和最大值)均经过设计验证，数据资料其它章节引用的参数值供设计人员参考。
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
10
©
2011 Maxim Integrated Products
Maxim是Maxim Integrated Products，Inc.的注册商标。
MAX15103 3A、低压差线性稳压器，采用2.7mm x 1.6mm小尺寸封装 - 概述
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Maxim > 产品 > 电源和电池管理 > MAX15103
MAX15103
3A、低压差线性稳压器，采用2.7mm x 1.6mm小尺寸封装
压差最低、尺寸最小的3A线性稳压器
概述
技术文档
定购信息 相关产品 用户说明 (0) 所有内容
状况
数据资料
状况 提供更新的英文版数据资料
：生产中。
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英文
Rev. 1 (PDF, 1.7MB)
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概述
中文
Rev. 0 (PDF, 1.8MB)
MAX15103是
小尺寸、低压差线性稳压器，优化用于网络、数据通信
以及服务器等领域。1.7V至5.5V输入电压范
E-Mail
围
内，稳压器可提供高达3A的输出电流，并保持±1.6%的输出精度
。输出电压可稳定在低至0.6V，保证整个负载
范
围
内压差小于200mV。折返式限流和热关断保护有效保障内部p沟道开关安全工作。
MAX15103提供外部旁路输入，以降低噪声。输入旁路也可用于软启动控制
。器件还包括使能输入和电源就绪输
出，用于电源排序控制
。
MAX15103采用1.6mm x 2.7mm WLP封装，工作在-40°C至+85°C温度范围。
现备有评估板：MAX15101EVKIT, MAX15102EVKIT, MAX15103EVKIT
关键特性
应用/使用
1.7V至5.5V工作电压范
输出3A电流时，保证200mV压差 网络
在输入电压、负载和温度的变化范 内，保持±1.6%输出精度 PLL电源
输出电压可调 ：0.6V至5.2V 服务器
折返式限流保护 电信/数据通信
围 基站
围
热关断保护
低噪声：15µV
(典型 值)
RMS
小尺寸1.6mm × 2.7mm WLP封装
关键特性:
Linear Regulators
Output
Voltage
Noise
(µV
V
DROPOUT
@Rated
Low
Batt./
Pwr.
Fail
Adj.
V
Adj.
V
POK/Reset
Thresh.
(V)
V
V
I
CC
IN
(V)
IN
(V)
Rated
LOAD
(mA)
Budgetary Price
OUT
(V)
OUT
(V)
Part
Number
Ref.
Bypass
Oper. Temp.
(°C)
I
(µA)
LOAD
(V)
I
Regulators
Watchdog
Package/Pins
RMS)
Out
min
max
min
max
typ
max
typ
nom
See Notes
MAX15103
1
1.7
5.5
0.6
5.3
0.056
3000
3500
16
Yes
No
Vout-10%
No
-40 to +85
WLP/15
$1.63 @1k
查看所有Linear Regulators (149)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may
differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized
distributor.
图表
http://china.maxim-ic.com/datasheet/index.mvp/id/7498[2012-08-15 8:05:31]
MAX15103 3A、低压差线性稳压器，采用2.7mm x 1.6mm小尺寸封装 - 概述
Typical Operating Circuit
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息
息
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注释、注解
参考文献： 19-6023 Rev. 1; 2012-08-13
本页最后一次更新: 2012-08-13
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© 2012 Maxim Integrated Products版权所有
http://china.maxim-ic.com/datasheet/index.mvp/id/7498[2012-08-15 8:05:31]
19-6023; Rev 1; 5/12
E V A L U A T I O N K I T A V A I L A B L E
General Description
Features
The MAX15103 is a small, low-dropout linear regulator
optimized for networking, datacom, and server applica-
tions. The regulator delivers up to 3A from a 1.7V to 5.5V
input supply with output accuracy of Q1.6%. The output
is adjustable down to 0.6V with a guaranteed dropout
voltage of less than 200mV at full load. The internal
p-channel switch is protected with a foldback current
limit and thermal shutdown.
S 1.7V to 5.5V Operating Range
S 200mV Dropout Guaranteed at 3A
S
1.6% Output Accuracy Over Line, Load, and
Temperature
S Adjustable Output from 0.6V to 5.2V
S Foldback Current Protection
S Thermal Shutdown Protection
The MAX15103 features an external bypass input to
reduce noise. This bypass input also serves as a soft-
start control. An enable input and power-good output are
included for power sequence control.
S Low Noise 15µV
(typ)
RMS
S Small 1.6mm x 2.7mm WLP Package
The MAX15103 is available in a 1.6mm x 2.7mm WLP
package and is fully specified from the -40NC to +85NC
operating temperature range.
Ordering Information appears at end of data sheet.
Applications
Networking
Telecom/Datacom
Servers
For related parts and recommended products to use with this part,
refer to www.maxim-ic.com/MAX15103.related.
Base Stations
PLL Power
Typical Operating Circuit
INPUT
(1.7V TO 5.5V)
OUTPUT
(0.6V TO V - 200mV)
IN
IN
OUT
MAX15103
C
22µF
C
2.2µF
OUT
IN
R1
0 TO 4.6kI
EN
PG
FB
POWER-GOOD
OUTPUT
R2
600I
GND
SS_BYP
C
SS
100nF
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
MAX15103
Small 3A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
ABSOLUTE MAXIMUM RATINGS
IN, EN, PG, SS_BYP, FB to GND ...........................-0.3V to +6V
Operating Temperature Range ........................ -40NC to +85NC
Storage Temperature Range ......................... -65NC to +150NC
Junction Temperature ....................................................+150NC
Soldering Temperature (reflow) (Note 1) ........................+260NC
OUT to GND...............................................-0.3V to (V + 0.3V)
OUT Short Circuit ......................................................Continuous
IN
Continuous Power Dissipation (T = +70NC)
A
WLP (derate 19.2mW/NC above +70NC)....................1538mW
Note 1: The WLP package is constructed using a unique set of package techniques that impose a limit on the thermal profile. The
device can be exposed during board-level solder attach and rework. This limit permits only the use of the solder profiles
recommended in the industry-standard specification JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection
reflow. Preheating is required. Hand or wave soldering is not allowed.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
PACKAGE THERMAL CHARACTERISTICS (Note 2)
WLP
Junction-to-Ambient Thermal Resistance (q ) ..........30°C/W
JA
Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(V = 3.3V, V
= 1.5V, V
= V , I
= 100mA, C = 2.2µF, C
= 22µF, T = T = -40NC to +85NC, typical values are at
OUT A J
IN
OUT
EN
IN OUT
IN
T
= +25NC, unless otherwise noted.) (Note 3)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
IN
Input Voltage Range
V
1.7
5.5
V
V
IN
Input Undervoltage Lockout
V
V
rising
1.624
40
1.69
IN_UV
IN
Input Undervoltage Lockout
Hysteresis
V
mV
IN_UV_HYS
OUT
Output Voltage Range
Load Regulation
V
0.6
5.2
V
OUT
I
= 30mA to 3A
0.1
%/A
OUT
V
= 1.7V to 5.5V, V
= 190mA
= 0.6V,
IN
OUT
Line Regulation
-0.15
+0.15
200
%/V
I
OUT
Dropout Voltage
I
= 3A, V = 580mV (Note 4)
65
mV
A
OUT
FB
In-Regulation Current Limit
V
V
V
= 5.5V, V = 500mV
3.7
IN
IN
IN
FB
Short-Circuit Foldback Current
Limit
= 5.5V, V
= 0V, V < 100mV
1.8
A
OUT
OUT
FB
= 5.5V, V
= 0V, V = 0V,
EN
Output Shutdown Leakage
Line Transient
4
FA
T = -40NC to +85NC
A
DV = 0.5V, t
= t = 5Fs
FALL
2
%
IN
RISE
2
MAX15103
Small 3A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
ELECTRICAL CHARACTERISTICS (continued)
(V = 3.3V, V
= 1.5V, V
= V , I
= 100mA, C = 2.2µF, C
= 22µF, T = T = -40NC to +85NC, typical values are at
IN
OUT
EN
IN OUT
IN
OUT
A
J
T
= +25NC, unless otherwise noted.) (Note 3)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
1.3
40
MAX
UNITS
%
I
t
= 100mA to 1A to 100mA,
OUT
RISE
Load Transient
Power-Supply Rejection
Output Voltage Noise
FB
= t
= 1Fs
FALL
Frequency = 100kHz, I
= 500mA
dB
OUT
Frequency = 500Hz to 100kHz,
15
FV
RMS
I
= 100mA
OUT
I
V
= 190mA, V
= 1.5V to 5V,
OUT
OUT
593
590
600
606
= (V
+ 0.3V) to 5.5V
IN
OUT
FB Threshold Accuracy
mV
I
= 3mA to 3A, V
= 1.5V to 5V,
OUT
OUT
610
1
V
= (V
+ 0.3V) to 5.5V
IN
OUT
FB Input Current
V
= 0.6V, V = 5.5V
FA
FB
IN
GND
Ground Supply Current
Ground Shutdown Current
POWER-GOOD OUTPUT
I
= 3A
1.8
3.5
1
mA
OUT
V
= 1.7V to 5.5V
FA
IN
FB = high
FB = low
638
538
650
550
662
562
V
moving out of
FB
Power-Good (PG) Threshold
mV
mV
regulation, V
= 15mV
HYS
Power-Good (PG) Output-
Voltage Low
I
= 2mA (sink)
25
80
PG
Power-Good (PG) Delay
Power-Good (PG) Leakage
ENABLE
100
Fs
V
= 5.5V
1
FA
PG
Enable Input High Threshold
Enable Input Low Threshold
Enable Input Bias Current
SOFT-START
V
1.2
V
V
EN_HIGH
V
0.4
+1
EN_LOW
V
= 0 to 5.5V
-1
8
FA
EN
Soft-Start Charging Current
V
V
= 100mV
SS_BYP
9.2
45
12
FA
SS_BYP
Soft-Start Pulldown Resistance
THERMAL SHUTDOWN
= 0V, I
= 2mA
100
I
EN
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
+160
15
NC
NC
Threshold falling
Note 3: All devices 100% production tested at T = +25°C. Limits over the temperature range are guaranteed by design.
A
Note 4: Dropout is defined as V - V
when V
falls 3% below its nominal voltage value.
IN
OUT
OUT
3
MAX15103
Small 3A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
Typical Operating Characteristics
(V = 1.8V, V
IN
= 1.5V, T = +25NC, unless otherwise noted.)
A
OUT
OUTPUT VOLTAGE ERROR
vs. OUTPUT CURRENT
DROPOUT VOLTAGE
vs. OUTPUT CURRENT
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
80
0.10
0.05
0
1.515
1.510
1.505
1.500
1.495
1.490
1.485
DEFINED V - V
FALLS 2%
WHEN V
NOMINAL
IN OUT
OUT
I
= 0.5A
OUT
70
60
50
40
30
20
10
0
V
= 2.5V
OUT
V
= 3V
OUT
V
= 1.8V
OUT
V
OUT
= 3.3V
V
= 1.5V
OUT
V
= 2.5V
2.5
OUT
-0.05
-0.10
V
= 5V
OUT
0
0.5
1.0
1.5
2.0
2.5
3.0
0
0.5
1.0
1.5
2.0
3.0
1.8 2.3 2.8 3.3 3.8 4.3 4.8 5.3
INPUT VOLTAGE (V)
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
OUTPUT VOLTAGE
vs. TEMPERATURE
SOFT-START TIME
vs. CAPACITOR VALUE
STARTUP WAVEFORMS
MAX15103 toc05
1.500
1.498
1.496
1.494
1.492
1.490
1.488
1.486
1.484
1.482
1.480
10
9
8
7
6
5
4
3
2
1
0
C
SS
=100nF
V
EN
1V/div
NO LOAD
I
IN
2A/div
V
OUT
1V/div
3A LOAD
2A LOAD
1A LOAD
V
PG
1V/div
-40
-15
10
35
60
85
1ms/div
5
25
45
65
85
100
TEMPERATURE (°C)
CAPACITOR VALUE (nF)
FB VOLTAGE vs. TEMPERATURE
1A LOAD-TRANSIENT RESPONSE
(V
= 1.5V)
OUT
MAX15103 toc08
0.600
0.599
0.598
0.597
0.596
0.595
0.594
0.593
0.592
0.591
NO LOAD
1A LOAD
V
OUT
AC-COUPLED
50mV/div
2A LOAD
3A LOAD
1A
I
OUT
500mA/div
100mA
-40
-15
10
35
60
85
40µs/div
TEMPERATURE (°C)
4
MAX15103
Small 3A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
Typical Operating Characteristics (continued)
(V = 1.8V, V
= 1.5V, T = +25NC, unless otherwise noted.)
IN
OUT
A
3A LOAD-TRANSIENT RESPONSE
2A LOAD-TRANSIENT RESPONSE
MAX15103 toc10
MAX15103 toc09
V
OUT
V
OUT
AC-COUPLED
50mV/div
AC-COUPLED
50mV/div
3A
2A
I
I
OUT
OUT
1A/div
1A/div
100mA
100mA
40µs/div
40µs/div
GROUND CURRENT
vs. INPUT VOLTAGE
LINE-TRANSIENT RESPONSE
FOLDBACK CURRENT-LIMIT WAVEFORMS
MAX15103 toc11
MAX15103 toc12
3.0
2.5
2.0
1.5
1.0
0.5
0
I
= 1A
LOAD
2.3V
V
OUT
500mV/div
V
IN
I
I
= 1A
= 0A
LOAD
200mV/div
1.8V
I
OUT
V
OUT
2A/div
LOAD
AC-COUPLED
20mV/div
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
100µs/div
100µs/div
NOISE DENSITY
PSRR vs. FREQUENCY
SHORT-CIRCUIT WAVEFORMS
(I
LOAD
= 100mA)
(I
LOAD
= 0.5A)
MAX15103 toc14
MAX15103 toc15
18
15
12
9
V
IN
3.3V
90
80
70
60
50
40
30
20
10
2V/div
NO C
SS
V
OUT
C
= 4.7nF
SS
1V/div
I
OUT
5A/div
C
= 100nF
SS
6
V
PG
2V/div
3
200µs/div
10Hz
100kHz 1MHz
100
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY
5
MAX15103
Small 3A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
Bump Configuration
TOP VIEW
MAX15103
1
2
3
4
5
+
A
EN
IN
PG
IN
GND
IN
SS_BYP
IN
FB
IN
B
C
OUT
OUT
OUT
OUT
OUT
WLP
Bump Description
BUMP
NAME
FUNCTION
Active-High Enable Input. Drive EN logic-high to enable the LDO. Connect to IN for always-on
operation.
A1
EN
A2
A3
PG
Power-Good Output. Open-drain output asserts high when the voltage is within regulation.
Ground
GND
SS_BYP Bypass/Soft-Start Input. Connect a ceramic capacitor from SS_BYP to GND to reduce the
output noise and set the soft-start ramp time.
A4
A5
SS_BYP
FB
Feedback Input. Connect a resistive divider from OUT to GND to set the output voltage.
B1, B2, B3,
B4, B5
Supply Voltage Input. Connect to supply voltage from 1.7V to 5.5V. Bypass IN to GND with a 2.2FF
or greater ceramic capacitor.
IN
C1, C2, C3,
C4, C5
Regulated Output. Connect a 22FF capacitor from OUT to GND. For better load transient
performance a larger capacitor can be used.
OUT
6
MAX15103
Small 3A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
Functional Diagram
SS_BYP
IN
UNDERVOLTAGE
LOCKOUT
THERMAL-
OVERLOAD
PROTECTION
ERROR
AMPLIFIER
0.60V
0.55V
0.65V
g
M
REF
P
EN
SHUTDOWN
LOGIC
I
LIM
OUT
FB
GND
PG
MAX15103
PG
CIRCUITRY
N
extremely low. PNP-based regulators also waste consider-
able current in dropout when the pass transistor saturates
and uses high base-drive currents under large loads. The
MAX15103 does not suffer from these deficiencies and
consumes only 1.8mA of quiescent current even in dropout.
Detailed Description
The MAX15103 is a small, low-dropout linear regulator
optimized for server, network, and telecom applications.
The regulator delivers up to 3A from a 1.7V to 5.5V input
supply with output accuracy of Q1.6%. The output is
adjustable down to 0.6V with a guaranteed dropout volt-
age of less than 200mV at full load. The internal p-chan-
nel switch is protected with a foldback current limit and
thermal shutdown.
Output Voltage Selection
The MAX15103 features an adjustable output. The out-
put voltage can be set between +0.6V to V - 200mV
IN
using an external resistive voltage-divider to FB (see
the Typical Operating Circuit). The output voltage is set
using the following equation:
The MAX15103 features an external bypass input to
reduce noise. This bypass input also serves as a soft-
start control. An enable input and power-good output are
included for power sequence control.
V
OUT
= V (1 + R1/R2)
FB
where V = +600mV.
FB
To simplify resistor selection:
R1 = R2 (V
Internal p-Channel Pass Transistor
The MAX15103 features a 3A p-channel MOSFET pass
transistor. Unlike similar designs with pnp pass transistors,
the gate-drive current to the p-channel power transistor is
/V - 1)
OUT FB
Set R2 to 600I.
7
MAX15103
Small 3A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
Enable
A logic-low on EN disables the MAX15103. In shutdown,
the pass transistor, control circuitry, reference, and all
biases are turned off, reducing supply current to typically
1FA. Connect EN to IN for normal operation. In shutdown,
the soft-start capacitor is discharged using an internal
pulldown resistance.
Operating Region and Power Dissipation
The power dissipation across the device is P = I
IN
OUT
(V - V
). The resulting maximum power dissipation is:
OUT
P
MAX
= [(T - T )/(B )]
J(MAX) A JA
where (T
- T ) is the temperature difference
A
J(MAX)
between the maximum allowed die junction (+150NC) and
the surrounding air. Figure 1 shows the allowable power
dissipation for typical PCBs at +25NC, +50NC, and +70NC
ambient temperatures (refer to the MAX15103 EV kit).
Soft-Start
As shown in the Typical Operating Circuit, the MAX15103
uses a g stage and integrating capacitor C to control
M
SS
the regulator’s feedback set point. When EN is driven
low, the soft-start capacitor is discharged. When EN is
driven high or power is applied to the device, a constant
9.2FA current charges the soft-start capacitor. At startup,
the feedback set point increases linearly, which reduces
the inrush supply current.
Applications Information
Capacitor Selection and Regulator Stability
Capacitors are required at the MAX15103’s input and
output. Connect at least a 2.2FF capacitor between IN
and GND (C ) and a 22FF capacitor between OUT and
IN
GND (C
). 10µF can be used for lower current opera-
= 6.315 x 10-5 x C
OUT
t
SS
SS
tion (1A for example). Use only surface-mount ceramic
capacitors that have low equivalent series resistance
(ESR). Make the input and output traces at least 2.5mm
where C is in nF. Use capacitor values between 30nF
SS
to 100nF with voltage ratings greater than 5V.
Because this ramp is applied to the current-limit com-
parator, the actual time for the output voltage to ramp up
depends on the load current and output capacitor. Leave
SS_BYP unconnected to disable soft-start.
wide, and connect C and C
minimize the impact of PCB trace inductance.
within 6mm of the IC to
IN
OUT
The output capacitor’s ESR can affect stability and output
noise. Use capacitors with 50mI or less ESR to ensure
stability and optimum transient response. This is par-
ticularly true in applications with very low output voltage
(< 2V) and high output current (> 0.5A).
Foldback Current Limiting
The MAX15103 features a 3.7A current limit when the
output voltage is in regulation. When the voltage at the
output drops to 17% of its nominal value, the current
limit exponentially folds back to 1.8A. The output can be
shorted to ground for an indefinite period of time without
damaging the device. Avoid continuous output current of
greater than 3A to prevent damage to the regulator.
Since some capacitor dielectrics can vary over bias volt-
age and temperature, consult the capacitor manufacturer
specifications to ensure that the capacitors meet these
requirements over all combinations of operating voltage
and temperature.
Thermal-Overload Protection
A thermal-overload circuit limits total power dissipation in
the MAX15103. When the junction temperature exceeds
3.5
3.0
T = +160NC, the thermal sensor turns off the pass tran-
J
2.5
sistor, allowing the IC to cool. The thermal sensor turns
the pass transistor on once the IC’s junction temperature
drops approximately 15NC. Continuous short-circuit condi-
tions will consequently result in a foldback limited output.
T
A
= +25NC
2.0
1.5
1.0
0.5
T
A
= +50NC
Thermal-overload protection is designed to safeguard
the MAX15103 in the event of fault conditions. For contin-
uous operation, do not exceed the junction temperature
T
A
= +70NC
T = +125NC (BASED ON MAX15103 EV KIT)
J
rating of T = +125NC.
J
0
0
1
2
3
4
5
INPUT-OUTPUT DIFFERENTIAL VOLTAGE (V)
Figure 1. Maximum Output Current Curves
8
MAX15103
Small 3A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
Input-Output (Dropout) Voltage
A regulator’s minimum input-to-output voltage differential
Ordering Information
(dropout voltage) determines the lowest usable supply
voltage. The dropout voltage is simply the product of
PART
TEMP RANGE
PIN-PACKAGE
MAX15103EWL+
-40NC to +85NC
15 WLP
regulator’s R
current. The MAX15103‘s R
for the pass device and rated load
DS(ON)
+Denotes a lead(Pb)-free/RoHS-compliant package.
is 20mI, at 3A this
DS(ON)
yields a dropout voltage of 60mV (see the Electrical
Characteristics and the Dropout Voltage vs. Output
Current graph in the Typical Operating Characteristics).
Chip Information
Noise, PSRR, and Transient Response
The MAX15103 is designed to achieve low dropout
voltage while still maintaining good noise, transient
response, and AC rejection. When operating from very
noisy sources, supply noise rejection and transient
response can be improved by increasing the values of
the input and output capacitors. The MAX15103 output
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maxim-ic.com/packages. Note that a
“+”, “#”, or “-” in the package code indicates RoHS status only.
Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
noise is typically 15FV
in the Typical Operating Characteristics).
(see the Noise Density graph
RMS
Thermal Considerations
in PCB Layout
PACKAGE PACKAGE
OUTLINE
NO.
LAND
PATTERN NO.
TYPE
CODE
The rated package dissipation strongly depends on the
copper area connected to the regulator. The maximum
power dissipation allowed in the package is 1538mW
(measured from the MAX15103 EV kit).
Refer to
Application
Note 1891
15 WLP
W151B2+1
21-0205
More power dissipation can be handled by the package
if great attention is given during PCB layout. For example,
using the top and bottom copper as a heatsink and
connecting the thermal vias to one of the middle layers
(GND) transfers the heat from the package into the board
more efficiently, resulting in lower junction temperature at
high power dissipation in some MAX15103 applications.
Furthermore, the solder mask around the IC area on both
top and bottom layers can be removed to radiate the heat
directly into the air. The maximum allowable power dis-
sipation in the IC is as follows:
P
MAX
= [(T - T )/(B )]
J(MAX) A JA
where (T
- T ) is the temperature difference
A
J(MAX)
between the maximum-allowed die junction (+150NC)
and the surrounding air.
A sample layout is available on the MAX15103 EV kit.
9
MAX15103
Small 3A, Low-Dropout Linear Regulator
in a 2.7mm x 1.6mm Package
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
DESCRIPTION
CHANGED
0
1
9/11
5/12
Initial release
—
2
Updated the Electrical Characteristics.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical
Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated Products, Inc. 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000
10
©
2012 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
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