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LTC3557

更新时间： 2024-11-11 05:43:55
品牌 Logo 应用领域
凌特 - Linear 稳压器电池
页数 文件大小 规格书
28页 312K
描述
USB Power Manager with Li-Ion Charger and Three Step-Down Regulators

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中文翻译

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LTC3557 数据手册

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LTC3557/LTC3557-1  
USB Power Manager with  
Li-Ion Charger and Three  
Step-Down Regulators  
FEATURES  
DESCRIPTION  
The LTC®3557/LTC3557-1 is a highly integrated power  
management and battery charger IC for single cell Li-Ion/  
Polymer battery applications. It includes a PowerPathTM  
manager with automatic load prioritization, a battery  
charger, an ideal diode and numerous internal protection  
features. Designed specifically for USB applications, the  
LTC3557/LTC3557-1 power manager automatically limits  
input current to a maximum of either 100mA or 500mA  
for USB applications or 1A for wall adapter powered  
applications. Battery charge current is automatically  
reduced such that the sum of the load current and the  
charge current does not exceed the programmed input  
current limit. The LTC3557/LTC3557-1 also includes three  
adjustable synchronous step-down switching regulators  
and a high voltage buck regulator output controller with  
Bat-Track that allows efficient charging from supplies as  
high as 38V. The LTC3557/LTC3557-1 is available in a low  
profile 4mm × 4mm × 0.75mm 28-pin QFN package.  
■
Seamless Transition Between Input Power Sources:  
Li-Ion Battery, USB, 5V Wall Adapter or High  
Voltage Buck Regulator with Bat-TrackTM  
200mΩ Internal Ideal Diode Plus Optional External  
■
Ideal Diode Controller Provides Low Loss Power  
Path When Input Current is Limited or Unavailable  
■
Triple Adjustable High Efficiency Step-Down  
Switching Regulators (600mA, 400mA, 400mA I  
)
OUT  
Pin Selectable Burst Mode® Operation  
■
■
■
■
Full Featured Li-Ion/Polymer Battery Charger  
1.5A Maximum Charge Current with Thermal Limiting  
Battery Float Voltage:  
4.2V (LTC3557)  
4.1V (LTC3557-1)  
Low Profile 4mm × 4mm 28-Pin QFN Package  
■
APPLICATIONS  
■
HDD-Based MP3 Players  
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology  
Corporation. Bat-Track and PowerPath are trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
■
PDA, PMP, PND/GPS  
■
USB-Based Handheld Products  
Protected by U.S. Patents, including 6522118, 6700364. Other patents pending.  
TYPICAL APPLICATION  
Input and Battery Current vs Load Current  
HV SUPPLY  
HIGH VOLTAGE  
BUCK DC/DC  
8V TO 38V  
(TRANSIENTS  
TO 60V)  
600  
R
R
= 2k  
PROG  
CLPROG  
I
= 2k  
IN  
500  
400  
300  
200  
100  
0
100mA/500mA  
1000mA  
USB OR  
I
V
LOAD  
OUT  
5V ADAPTER  
0V  
CC/CV  
CHARGER  
I
BAT  
(CHARGING)  
CHARGE  
+
SINGLE CELL  
Li-Ion  
NTC  
LTC3557/LTC3557-1  
ALWAYS ON LDO  
3.3V/25mA  
I
BAT  
(DISCHARGING)  
400  
500  
WALL = 0V  
100  
0.8V to 3.6V/600mA  
0.8V to 3.6V/400mA  
0.8V to 3.6V/400mA  
–100  
TRIPLE HIGH EFFICIENCY  
STEP-DOWN  
600  
0
200  
300  
(mA)  
RST  
SWITCHING REGULATORS  
I
LOAD  
35571 TA01b  
35571 TA01a  
35571fc  
1
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