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参数资料
| 型号： | LM3420M5X-8.2/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封装： | MINIATURE, SOT-23, 5 PIN |
| 文件页数： | 1/17页 |
| 文件大小： | 441K |
| 代理商： | LM3420M5X-8.2/NOPB |
LM3420-4.2, -8.2, -8.4, -12.6, -16.8
Lithium-Ion Battery Charge Controller
General Description
The LM3420 series of controllers are monolithic integrated
circuits designed for charging and end-of-charge control for
Lithium-Ion rechargeable batteries. The LM3420 is available
in five fixed voltage versions for one through four cell charger
applications (4.2V, 8.2V/8.4V, 12.6V and 16.8V respec-
tively).
Included in a very small package is an (internally compen-
sated) op amp, a bandgap reference, an NPN output tran-
sistor, and voltage setting resistors. The amplifier’s inverting
input is externally accessible for loop frequency compensa-
tion. The output is an open-emitter NPN transistor capable of
driving up to 15 mA of output current into external circuitry.
A trimmed precision bandgap reference utilizes temperature
drift curvature correction for excellent voltage stability over
the operating temperature range. Available with an initial
tolerance of 0.5% for the A grade version, and 1% for the
standard version, the LM3420 allows for precision end-of-
charge control for Lithium-Ion rechargeable batteries.
The LM3420 is available in a sub-miniature 5-lead SOT23-5
surface mount package thus allowing very compact designs.
Features
n
Voltage options for charging 1, 2, 3 or 4 cells
n
Tiny SOT23-5 package
n
Precision (0.5%) end-of-charge control
n
Drive capability for external power stage
n
Low quiescent current, 85 A (typ.)
Applications
n
Lithium-Ion battery charging
n
Suitable for linear and switching regulator charger
designs
Typical Application and Functional Diagram
01235901
Typical Constant Current/Constant Voltage
Li-Ion Battery Charger
01235902
LM3420 Functional Diagram
SIMPLE SWITCHER is a registered trademark of National Semiconductor Corporation.
July 2000
LM3420-4.2,
-8.2,
-8.4,
-12.6,
-16.8
Lithium-Ion
Battery
Charge
Controller
2004 National Semiconductor Corporation
DS012359
www.national.com
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