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LTC4008EGN PDF预览

LTC4008EGN

更新时间： 2024-02-28 18:07:05
品牌 Logo 应用领域
凌特 - Linear 电池
页数 文件大小 规格书
24页 263K
描述
4A, High Efficiency, Multi-Chemistry Battery Charger

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中文翻译

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LTC4008EGN 数据手册

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LTC4008  
4A, High Efficiency,  
Multi-Chemistry Battery Charger  
U
DESCRIPTIO  
FEATURES  
The LTC®4008 is a constant-current/constant-voltage  
charger controller. The PWM controller uses a synchro-  
nous, quasi-constant frequency, constant off-time archi-  
tecture that will not generate audible noise even when  
using ceramic capacitors. Charging current is program-  
mable with a sense resistor and programming resistor to  
±4% typical accuracy. Charging current can be monitored  
as a voltage across the programming resistor. An external  
resistor divider and precision internal reference set the  
final float voltage.  
■
General Purpose Charger Controller  
■
High Conversion Efficiency: Up to 96%  
■
Output Currents Exceeding 4A  
■
±0.8% Voltage Accuracy  
■
AC Adapter Current Limiting Maximizes  
Charge Rate*  
■
Thermistor Input for Temperature Qualified Charging  
Wide Input Voltage Range: 6V to 28V  
Wide Output Voltage: 3V to 28V  
■
■
■
■
■
0.5V Dropout Voltage; Maximum Duty Cycle: 98%  
Programmable Charge Current: ±4% Accuracy  
Indicator Outputs for Charging, C/10 Current  
Detection, AC Adapter Present, Input Current  
Limiting and Faults  
Charging Current Monitor Output  
Available in a 20-Pin Narrow SSOP Package  
The LTC4008 includes a thermistor sensor input that will  
suspend charging if an unsafe temperature condition is  
detected and will automatically resume charging when  
battery temperature returns to within safe limits; a FAULT  
pin indicates this condition. A FLAG pin indicates when  
charging current has decreased below 10% of the pro-  
grammed current. An external sense resistor programs  
AC adapter current limiting. The ICL pin indicates when the  
chargingcurrentisbeingreducedbyinputcurrentlimiting  
so that the charging algorithm can adapt.  
■
■
U
APPLICATIO S  
■
Notebook Computers  
■
Portable Instruments  
, 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 5723970  
■
Battery Backup Systems  
U
TYPICAL APPLICATIO  
12.3V, 4A Li-Ion Charger  
INPUT SWITCH  
DCIN  
0V TO 28V  
0.1µF  
140k*  
LTC4008  
BATMON  
V
LOGIC  
DCIN  
INFET  
CLP  
0.1µF  
0.02Ω  
V
100k 100k  
FB  
SYSTEM  
LOAD  
4.99k  
I
I
CL  
CL  
20µF  
10µH  
ACP  
ACP/SHDN  
FAULT  
FLAG  
CLN  
FAULT  
FLAG  
TGATE  
BGATE  
PGND  
CSP  
Q1  
0.025Ω  
32.4k  
Li-Ion  
BATTERY  
Q2  
NTC  
20µF  
R
T
3.01k  
15k*  
I
BAT  
TH  
THERMISTOR  
3.01k  
GND  
PROG  
6.04k  
0.12µF  
150k  
10k  
CHARGING  
CURRENT  
MONITOR  
NTC  
0.47µF  
Q1: Si4431BDY  
Q2: FDC645N  
26.7k  
0.0047µF  
NOTE: * 0.25% TOLERANCE  
ALL OTHER RESISTORS ARE 1% TOLERANCE  
4008 TA01  
4008fa  
1
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