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LTC3553-2 PDF预览

LTC3553-2

更新时间： 2024-09-25 14:58:11
品牌 Logo 应用领域
亚德诺 - ADI 电池稳压器
页数 文件大小 规格书
36页 422K
描述
具锂离子电池充电器、始终保持接通的 LDO 和降压型稳压器的微功率 USB 电源管理器

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LTC3553-2 数据手册

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LTC3553-2  
Micropower USB Power  
Manager with Li-Ion Charger,  
Always-On LDO and Buck Regulator  
DESCRIPTION  
FEATURES  
The LTC®3553-2 is a micropower, highly integrated  
n
12μA Standby Mode Quiescent Current (All Outputs On)  
Seamless Transition Between Input Power Sources:  
Li-Ion/Polymer Battery and USB  
240mΩ Internal Ideal Diode Provides Low Loss  
PowerPath™  
High Efficiency 200mA Buck Regulator  
Always-On 150mA Low Dropout (LDO) Linear  
Regulator  
Pushbutton On/Off Control With System Reset  
Full Featured Li-Ion/Polymer Battery Charger  
Programmable Charge Current With Thermal Limiting  
Instant-On Operation With Discharged Battery  
3mm × 3mm × 0.75mm 20-Pin QFN Package  
n
power management and battery charger IC for single-cell  
Li-Ion/Polymer battery applications. It includes a  
PowerPath manager with automatic load prioritization,  
a battery charger, an ideal diode and numerous internal  
protection features. Designed specifically for USB applica-  
tions, the LTC3553-2 power manager automatically limits  
input current to a maximum of either 100mA or 500mA.  
Battery charge current is automatically reduced such that  
the sum of the load current and the charge current does  
not exceed the selected input current limit. The LTC3553-2  
also includes a synchronous buck regulator, an always-on  
low dropout linear regulator (LDO), and a pushbutton  
controller. With all supplies enabled in standby mode, the  
quiescent current drawn from the battery is only 12μA.  
The LTC3553-2 is available in a 3mm × 3mm × 0.75mm  
20-pin QFN package.  
n
n
n
n
n
n
n
n
APPLICATIONS  
n
USB-Based Handheld Products  
n
Portable Li-Ion/Polymer Based Electronic Devices  
L, LT, LTC, LTM, Linear Technology, the Linear logo, and Burst Mode are registered trademarks  
and PowerPath, Hot Swap, and Bat-Track are trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners. Protected by U.S. Patents,  
including 6522118, 6700364, 5481178, 6304066, 6570372, 6580258, 7511390 and other  
patents pending.  
n
Wearable Electronics  
Low Power Medical Devices  
n
TYPICAL APPLICATION  
4.35V TO 5.5V  
SYSTEM  
LOAD  
Battery Drain Current  
V
V
OUT  
BUS  
USB INPUT  
vs Temperature  
10ꢀF  
10ꢀF  
100k  
LTC3553-2  
18  
V
= 3.8V  
CHRG  
NTC  
BAT  
STBY = 3.8V  
16  
14  
12  
10  
8
BAT  
PROG  
REGULATORS LOAD = 0mA  
100k  
T
+
Li-Ion  
BATTERY  
1.87k  
BUCK AND LDO ON  
ONLY LDO ON  
BVIN  
2.2ꢀF  
V
INLDO  
PGOOD  
HPWR  
6
3.3V  
LDO  
150mA  
4
2.05M  
4.7ꢀF  
SUSP  
DIGITAL  
2
HARD RESET  
CONTROL  
LDO_FB  
SW  
BUCK_ON  
STBY  
0
649k  
–50 –30 –10 10 30 50 70 90 110 130  
TEMPERATURE (°C)  
PBSTAT  
10ꢀH  
10pF  
1.2V  
200mA  
35532 TA01b  
332k  
649k  
10ꢀF  
ON  
BUCK_FB  
ON/OFF  
35532 TA01a  
35532f  
1
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