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LTC3554EPDPBF

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
36页 429K
描述
Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators

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LTC3554EPDPBF 数据手册

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LTC3554  
Micropower USB Power  
Manager with Li-Ion Charger  
and Two Step-Down Regulators  
DESCRIPTION  
FEATURES  
The LTC®3554 is a micropower, highly integrated 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  
protectionfeatures.DesignedspecificallyforUSBapplica-  
tions, the LTC3554 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.  
n
10μA Standby Mode Quiescent Current (All Outputs On)  
n
Seamless Transition Between Input Power Sources:  
Li-Ion/Polymer Battery and USB  
n
240mΩ Internal Ideal Diode Provides Low Loss  
PowerPath™  
n
Dual High Efficiency Step-Down Switching Regulators  
(200mA I ) with Adjustable Output Voltages  
OUT  
n
n
n
n
n
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  
Compact Ultrathin 3mm × 3mm × 0.55mm 20-Pin  
UTQFN Package  
The LTC3554 also includes two synchronous step-down  
switching regulators as well as a pushbutton controller.  
With all supplies enabled in standby mode, the quiescent  
currentdrawnfromthebatteryisonly10μA. TheLTC3554  
is available in a 3mm × 3mm × 0.55mm 20-pin UTQFN  
package.  
APPLICATIONS  
n
USB-Based Handheld Products  
n
Portable Li-Ion/Polymer Based Electronic Devices  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear  
Technology Corporation. PowerPath is a trademark 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.  
n
Wearable Computers  
Low Power Medical Devices  
n
TYPICAL APPLICATION  
Battery Drain Current  
4.35V TO 5.5V  
USB INPUT  
SYSTEM  
LOAD  
V
BUS  
V
vs Temperature  
OUT  
10ꢀF  
100k  
14  
V
= 3.8V  
STBY = 3.8V  
REGULATORS LOAD = 0mA  
BAT  
NTC  
CHRG  
LTC3554  
12  
10  
8
PROG  
BAT  
100k  
T
+
Li-Ion  
BATTERY  
BOTH REGULATORS  
ENABLED  
1.87k  
HPWR  
SUSP  
BVIN  
2.2ꢀF  
ONE REGULATOR ENABLED  
6
4.7ꢀH  
BOTH REGULATORS DISABLED  
3.3V  
PWR_ON1  
SW1  
FB1  
4
200mA  
2.05M  
10pF  
10ꢀF  
10ꢀF  
2
FSEL  
HARD RESET  
649k  
STBY  
0
–75 –50 –25  
0
25 50 75 100 125  
PGOOD  
PWR_ON2  
PBSTAT  
ON  
10ꢀH  
10pF  
TEMPERATURE (°C)  
1.2V  
200mA  
SW2  
3554 TA01b  
332k  
649k  
FB2  
3554 TA01a  
ON/OFF  
3554f  
1
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