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LTC4002-4.2

更新时间： 2024-09-20 22:11:03
品牌 Logo 应用领域
凌特 - Linear 电池开关
页数 文件大小 规格书
16页 198K
描述
Standalone Li-Ion Switch Mode Battery Charger

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LTC4002-4.2 数据手册

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Final Electrical Specifications  
LTC4002-4.2  
Standalone Li-Ion  
Switch Mode Battery Charger  
June 2003  
U
FEATURES  
DESCRIPTIO  
Wide Input Supply Range: 4.7V to 24V  
TheLTC®4002-4.2isacompletebatterychargercontroller  
for single cell 4.2V lithium-ion batteries. With a 500kHz  
switching frequency, the LTC4002-4.2 provides a small,  
simpleandefficientsolutiontofastchargeLi-Ionbatteries  
from a wide range of supply voltages. An external sense  
resistor sets the charge current with ±5% accuracy. An  
internal resistor divider and precision reference set the  
final float voltage to 4.2V with ±1% accuracy.  
■
■
High Efficiency Current Mode PWM Controller with  
500kHz Switching Frequency  
±1% Charge Voltage Accuracy  
End-of-Charge Current Detection Output  
3 Hour Charge Termination Timer  
■
■
■
■
Constant Switching Frequency for Minimum Noise  
■
±5% Charge Current Accuracy  
■
Low 10µA Reverse Battery Drain Current  
When the input supply is removed, the LTC4002-4.2  
automatically enters a low current sleep mode, dropping  
the battery drain current to 10µA. An internal comparator  
detects the near end-of-charge condition while an internal  
timer sets the total charge time and terminates the charge  
cycle. After the charge cycle ends, if the battery voltage  
drops below 4.05V, a new charge cycle will automatically  
begin.  
■
Automatic Battery Recharge  
■
Automatic Shutdown When Input Supply is Removed  
■
Automatic Trickle Charging of Low Voltage Batteries  
■
Battery Temperature Sensing and Charge  
Qualification  
■
Stable with Ceramic Output Capacitor  
■
8-Lead SO and 1U0-Lead DFN Packages  
APPLICATIO S  
■
The LTC4002-4.2 is available in the 8-lead SO and 10-lead  
DFN packages.  
Portable Computers  
Charging Docks  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
■
■
Handheld Instruments  
U
TYPICAL APPLICATIO  
V
IN  
5V TO 24V  
B330B-13  
Efficiency vs Input Voltage  
2
0.1µF  
10µF  
100  
90  
80  
70  
60  
V
CER  
CC  
CER  
BAT  
2k  
I
R
= 1.5A  
SENSE  
CHRG  
3
GATE  
Si6435ADQ  
= 68mΩ  
(CURVES INCLUDE  
INPUT DIODE)  
LTC4002ES8-4.2  
B330B-13  
L1  
6.8µH  
CHARGE  
STATUS  
V
BAT  
= 4V  
5
7
6
CHRG  
SENSE  
V
BAT  
= 3.8V  
68mΩ  
1
COMP  
NTC  
BAT  
GND  
+
22µF  
CER  
0.47µF  
Li-Ion  
BATTERY  
8
4
2.2k  
10k  
NTC  
400242 F01  
T
NTC: DALE NTHS-1206N02  
15  
INPUT VOLTAGE (V)  
5
10  
20  
25  
400242 TA02  
Figure 1. 1.5A Single Cell Li-Ion Battery Charger  
400242i  
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.  
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-  
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.  
1
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