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LTC4069-4.4 PDF预览

LTC4069-4.4

更新时间： 2023-12-20 18:44:55
品牌 Logo 应用领域
亚德诺 - ADI 电池
页数 文件大小 规格书
16页 202K
描述
采用 2mm x 2mm DFN 封装并具有 NTC 热敏电阻输入的独立 750mA 锂离子电池充电器

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LTC4069-4.4 数据手册

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LTC4069-4.4  
Standalone 750mA Li-Ion  
Battery Charger in 2 × 2 DFN  
with NTC Thermistor Input  
DESCRIPTION  
FEATURES  
The LTC®4069-4.4 is a complete constant-current/  
constant-voltagelinearchargerforhighcapacitysingle-cell  
lithium-ion batteries with a 4.4V float voltage. The 2mm  
× 2mm DFN package and low external component count  
make the LTC4069-4.4 especially well-suited for portable  
applications. Furthermore, LTC4069-4.4 is specifically  
designed to work within USB power specifications.  
n
Complete Linear Charger in 2mm × 2mm DFN  
Package  
n
C/10 Charge Current Detection Output  
n
Timer Charge Termination  
n
Charge Current Programmable Up to 750mA with  
5% Accuracy  
n
No External MOSFET, Sense Resistor or Blocking  
Diode Required  
The CHRG pin indicates when charge current has dropped  
to ten percent of its programmed value (C/10). An  
internal timer terminates charging according to battery  
manufacturer specifications.  
n
NTC Thermistor Input for Temperature Qualified  
Charging  
n
Preset 4.4V Float Voltage with 0.6% Accuracy  
n
Constant-Current/Constant-Voltage Operation with  
Noexternalsenseresistororblockingdiodeisrequireddueto  
theinternalMOSFETarchitecture.Thermalfeedbackregulates  
chargecurrenttolimitthedietemperatureduringhighpower  
operation or high ambient temperature conditions.  
Thermal Feedback to Maximize Charge Rate  
Without Risk of Overheating  
n
Charge Current Monitor Output for Gas Gauging  
n
Automatic Recharge  
n
Charges Single-Cell Li-Ion Batteries Directly from  
When the input supply (wall adapter or USB supply) is  
removed,theLTC4069-4.4automaticallyentersalowcurrent  
state, dropping battery drain current to less than 1μA. With  
powerapplied,LTC4069-4.4canbeputintoshutdownmode,  
reducing the supply current to less than 20μA.  
USB Port  
n
20μA Supply Current in Shutdown Mode  
n
Soft-Start Limits Inrush Current  
n
Tiny 6-Lead (2mm × 2mm) DFN Package  
APPLICATIONS  
The LTC4069-4.4 also includes automatic recharge, low-  
battery charge conditioning (trickle charging), soft-start  
(to limit inrush current) and an NTC thermistor input used  
to monitor battery temperature.  
n
Wireless PDAs  
Cellular Phones  
n
n
Portable Electronics  
The LTC4069-4.4 is available in a tiny 6-lead, low profile  
(0.75mm) 2mm × 2mm DFN package.  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
Protected by U.S. Patents, including 6522118, 6700364.  
Complete Charge Cycle (1100mAh Battery)  
TYPICAL APPLICATION  
550  
500  
450  
400  
350  
300  
250  
200  
150  
100  
50  
4.5  
4.4  
4.3  
4.2  
4.1  
4.0  
3.9  
3.8  
3.7  
3.6  
3.5  
3.4  
CONSTANT-CURRENT  
Standalone Li-Ion Battery Charger  
500mA  
CHRG  
V
TRANSITION  
IN  
V
BAT  
CC  
4.5V TO 5.5V  
CONSTANT-  
VOLTAGE  
R1  
510Ω  
LTC4069-4.4  
R
NOM  
100k  
CHRG PROG  
4.4V  
+
Li-Ion  
NTC  
GND  
BATTERY*  
R
PROG  
R
NTC  
100k  
1μF  
2k  
CHARGE  
TERMINATION  
4069 TA01  
V
= 5V  
PROG  
CC  
R
= 2K  
*E.G. SANYO BATTERIES: UF553436T OR UF553450T  
0
0
1
1.5  
2
2.5  
3
3.5  
4
4.5  
5
0.5  
TIME (HOURS)  
4069 TA01b  
406944fa  
1
1234567...16

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