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LTC4059A_15

更新时间： 2024-10-01 01:17:35
品牌 Logo 应用领域
凌特 - Linear 电池
页数 文件大小 规格书
12页 319K
描述
900mA Linear Li-Ion Battery Chargers with Thermal Regulation in 2 2 DFN

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LTC4059A_15 数据手册

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LTC4059/LTC4059A  
900mA Linear Li-Ion  
Battery Chargers with  
Thermal Regulation in 2 × 2 DFN  
U
FEATURES  
DESCRIPTIO  
The LTC®4059/LTC4059A are constant-current/constant-  
voltagelinearchargersforsinglecelllithium-ionbatteries.  
Their 2mm × 2mm DFN package and low external compo-  
nent count make these chargers especially well suited for  
portable applications. Furthermore, they are designed to  
work within USB power specifications.  
■
Programmable Charge Current Up to 900mA  
■
Charge Current Monitor Output for Charge  
Termination  
■
Constant-Current/Constant-Voltage Operation with  
Thermal Regulation to Maximize Charging Rate  
Without Risk of Overheating  
■
■
■
Constant-Current Source Mode for Charging  
Nickel Batteries (LTC4059 Only)  
ACPR Pin Indicates Presence of Input Supply  
(LTC4059A Only)  
No External MOSFET, Sense Resistor or Blocking  
Diode Required  
Operating Supply Voltage from 3.75V to 8V  
Charges Single Cell Li-Ion Batteries Directly from  
USB Port  
Preset 4.2V Charge Voltage with 0.6% Accuracy  
10µA Supply Current in Shutdown Mode  
Tiny 6-Lead (2mm × 2mm) DFN Package  
U
No external sense resistor, MOSFET or blocking diode is  
required. Thermal feedback regulates the charge current  
tolimitthedietemperatureduringhighpoweroperationor  
high ambient thermal conditions. The charge voltage is  
fixed at 4.2V and the charge current is programmable.  
■
■
When the input supply (wall adapter or USB supply) is  
removed,theLTC4059/LTC4059Aautomaticallyenteralow  
currentstate,droppingthebatterycurrentdraintolessthan  
1µA. With power applied, they can be put into shutdown  
mode, reducing the supply current to 10µA.  
■
■
■
The LTC4059A features an open-drain status pin to indi-  
cate the presence of an input voltage. The LTC4059 can be  
used as a constant-current source to charge Nickel cells.  
Other features include undervoltage lockout protection  
and a current monitor pin which can indicate when to  
terminate a charge cycle.  
APPLICATIO S  
■
■
■
■
■
Wireless PDAs  
Cellular Phones  
Portable Electronics  
Wireless Headsets  
Digital Cameras  
The LTC4059/LTC4059A are available in a 6-lead, low  
profile (0.75mm) 2mm × 2mm DFN package.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
Protected by U.S. Patents, including 6522118.  
U
Complete Charge Cycle (800mAh Battery)  
TYPICAL APPLICATIO  
700  
4.4  
CONSTANT  
CURRENT  
CONSTANT  
VOLTAGE  
V
DD  
50k  
600  
4.2  
V
IN  
4.5V TO 8V  
500  
400  
300  
200  
100  
0
4.0  
3.8  
3.6  
3.4  
3.2  
3.0  
ACPR  
µP  
V
CC  
LTC4059A  
EN  
GND PROG  
600mA  
BAT  
1µF  
4.2V  
Li-Ion  
BATTERY  
+
2k  
V
= 5V  
PROG  
= 25°C  
CC  
4059 TA01  
R
= 2k  
T
A
0
0.5  
1
1.5  
2
2.5  
4059 TA02  
TIME (HOURS)  
4059fb  
1
1234567...12

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