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LTC4085

更新时间： 2024-11-08 14:57:27
品牌 Logo 应用领域
亚德诺 - ADI 电池控制器二极管
页数 文件大小 规格书
24页 285K
描述
具有理想二极管控制器和锂离子电池充电器的 USB 电源管理器

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中文翻译

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LTC4085 数据手册

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LTC4085  
USB Power Manager with  
Ideal Diode Controller and  
Li-Ion Charger  
FEATURES  
DESCRIPTION  
n
Seamless Transition Between Input Power Sources:  
The LTC®4085 is a USB power manager and Li-Ion battery  
charger designed for portable battery-powered applica-  
tions. The part controls the total current used by the USB  
peripheral for operation and battery charging. The total  
input current can be limited to 20% or 100% of a pro-  
grammed value up to 1.5A (typically 100mA or 500mA).  
Battery charge current is automatically reduced such that  
the sum of the load current and charge current does not  
exceed the programmed input current limit.  
Li-Ion Battery, USB and 5V Wall Adapter  
n
215mΩ Internal Ideal Diode Plus Optional External  
IdealDiodeControllerProvideLowLossPowerPath™  
When Wall Adapter/USB Input Not Present  
n
Load Dependent Charging Guarantees Accurate USB  
Input Current Compliance  
n
Constant-Current/Constant-Voltage Operation with  
Thermal Feedback to Maximize Charging Rate Without  
Risk of Overheating*  
The LTC4085 includes a complete constant-current/  
constant-voltage linear charger for single cell Li-ion bat-  
teries. The float voltage applied to the battery is held to a  
tight0.8%tolerance, andchargecurrentisprogrammable  
using an external resistor to ground. An end-of-charge  
status output CHRG indicates full charge. Total charge  
time is programmable by an external capacitor to ground.  
When the battery drops 100mV below the float voltage,  
automatic recharging of the battery occurs. Also featured  
is an NTC thermistor input used to monitor battery tem-  
perature while charging.  
n
Selectable 100% or 20% Input Current Limit  
(e.g., 500mA/100mA)  
n
Battery Charge Current Independently Programmable  
Up to 1.2A  
n
Preset 4.2V Charge Voltage with 0.8% Accuracy  
n
C/10 Charge Current Detection Output  
n
NTC Thermistor Input for Temperature Qualified Charging  
n
Tiny (4mm × 3mm × 0.75mm) 14-Lead DFN Package  
APPLICATIONS  
n
Portable USB Devices: Cameras, MP3 Players, PDAs  
The LTC4085 is available in a 14-lead low profile 4mm ×  
3mm DFN package.  
L, LT, LTC and LTM 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.  
Other patents pending.  
TYPICAL APPLICATION  
Input and Battery Current vs Load Current  
I
LOAD  
RPROG = 100k, RCLPROG = 2k  
5V WALL  
ADAPTER  
INPUT  
TO LDOs,  
REGs, ETC  
600  
4.7μF  
I
IN  
5V (NOM)  
I
IN  
FROM USB  
500  
400  
300  
200  
100  
0
IN  
WALL  
ACPR  
OUT  
CABLE V  
510Ω  
1k  
BUS  
4.7μF  
SUSPEND USB POWER  
100mA 500mA SELECT  
SUSP  
HPWR  
PROG  
CLPROG  
NTC  
I
LOAD  
LTC4085  
GND  
GATE  
BAT  
*
I
BAT  
(CHARGING)  
CHRG  
I
V
NTC  
TIMER  
BAT  
I
BAT  
(DISCHARGING)  
+
10k  
WALL = 0V  
100  
–100  
0
200  
300 500  
400  
(mA)  
600  
*
OPTIONAL - TO LOWER  
IDEAL DIODE IMPEDANCE  
I
LOAD  
0.1μF  
100k  
2k  
10k  
4085 TA01b  
4085 TA01  
4085fd  
1
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