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LT1769IFE

更新时间： 2022-02-26 13:54:10
品牌 Logo 应用领域
Linear Systems 电池
页数 文件大小 规格书
16页 219K
描述
Constant-Current/ Constant-Voltage 2A Battery Charger with Input Current Limiting

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LT1769IFE 数据手册

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LT1769  
Constant-Current/  
Constant-Voltage 2ABattery  
Charger with Input Current Limiting  
U
FEATURES  
DESCRIPTIO  
The LT®1769 current mode PWM battery charger is a  
■
Simple Solution to Charge NiCd, NiMH and Lithium  
Rechargeable Batteries—Charging Current  
Programmed by Resistors or DAC  
Adapter Current Limit Allows Maximum Possible  
Charging Current During System Use*  
Precision 0.5% Accuracy for Voltage Mode Charging  
Available in 20-Lead Exposed Pad TSSOP and  
28-Lead Narrow SSOP Packages  
High Efficiency Current Mode PWM with 3A Internal  
Switch  
5% Charge Current Accuracy  
Adjustable Undervoltage Lockout  
simple, efficient solution to fast charge modern recharge-  
able batteries including lithium-ion (Li-Ion), nickel-metal-  
hydride (NiMH) and nickel-cadmium (NiCd) that require  
constant-current and/or constant-voltage charging. The  
internal switch is capable of delivering 2A** DC current  
(3A peak current). Charge current can be programmed by  
resistorsoraDACtowithin5%. With0.5%referencevoltage  
accuracy, the LT1769 meets the critical constant-voltage  
charging requirement for Li-Ion cells.  
■
■
■
■
■
■
■
■
■
■
■
A third control loop is provided to regulate the current  
drawn from the input AC adapter. This allows simulta-  
neous operation of the equipment and battery charging  
withoutoverloadingtheadapter.Chargecurrentisreduced  
to keep the adapter current below specified levels.  
Automatic Shutdown When AC Adapter is Removed  
Low Reverse Battery Drain Current: 3µA  
Current Sensing Can Be at Either Terminal of the Battery  
Charging Current Soft Start  
The LT1769 can charge batteries ranging from 1V to 20V.  
Groundsensingofcurrentisnotrequiredandthebattery’s  
negative terminal can be tied directly to ground. A saturat-  
ing switch running at 200kHz gives high charging effi-  
ciency and small inductor size. A blocking diode is not  
required between the chip and the battery because the  
chip goes into sleep mode and drains only 3µA when the  
wall adapter is unplugged.  
Shutdown Control  
U
APPLICATIO S  
■
Chargers for NiCd, NiMH, Lead-Acid, Lithium  
Rechargeable Batteries  
■
Switching Regulators with Precision Current Limit  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
*US patent number 5,723,970  
**See LT1510 for 1.5A charger; see LT1511 for 3A charger  
D3††  
U
R7†  
SS24  
500Ω  
TYPICAL APPLICATIO  
V
(ADAPTER INPUT)  
IN  
CLP  
CLN  
GND  
†
11V TO 28V  
R
S4  
C1  
1µF  
ADAPTER  
CURRENT SENSE  
SW  
TO MAIN  
SYSTEM LOAD  
C2  
D1††  
V
CC  
0.47µF  
C
*
IN  
15µF  
R5†  
SS24  
BOOST  
LT1769  
UNDERVOLTAGE  
LOCKOUT  
L1**  
22µH  
UV  
COMP1  
D2  
1N4148  
R6  
5k  
2nF  
10k  
PROG  
V
C
300Ω  
SPIN  
R
PROG  
4.93k  
1%  
C
PROG  
1µF  
0.33µF  
OVP SENSE  
BAT  
R
R
S2  
S3  
NOTE: COMPLETE LITHIUM-ION CHARGER,  
200Ω  
200Ω  
NO TERMINATION REQUIRED. R , R7  
1%  
S4  
1%  
AND C1 ARE OPTIONAL FOR I LIMITING  
IN  
V
BAT  
R3  
*TOKIN OR UNITED CHEMI-CON/MARCON  
R
S1  
+
C
OUT  
8.4V  
Li-Ion  
390k  
CERAMIC SURFACE MOUNT  
0.05Ω  
22µF  
0.25%  
BATTERY  
VOLTAGE SENSE  
**22µH SUMIDA CDRH125  
BATTERY CURRENT  
SENSE  
TANT  
†
SEE APPLICATIONS INFORMATION FOR  
1511 • F01  
INPUT CURRENT LIMIT AND UNDERVOLTAGE LOCKOUT  
††  
GENERAL SEMICONDUCTOR. FOR T LESS THEN 100°C  
J
R4  
162k  
0.25%  
MBRS130LT3 CAN BE USED  
Figure 1. 2A Lithium-Ion Battery Charger  
1769fa  
1
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