LM3420-12.6 National Semiconductor, LM3420-12.6 Datasheet

LM3420-12.6

Manufacturer Part Number

LM3420-12.6

Description

Lithium-Ion Battery Charge Controller

Manufacturer

National Semiconductor

Datasheet

1.LM3420-12.6.pdf (17 pages)

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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 transis-

tor, and voltage setting resistors. The amplifier’s inverting in-

put

compensation. 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 tol-

erance of 0.5% for the A grade version, and 1% for the stan-

dard version, the LM3420 allows for precision end-of-charge

control for Lithium-Ion rechargeable batteries.

Typical Application and Functional Diagram

SIMPLE SWITCHER

externally

is a registered trademark of National Semiconductor Corporation.

accessible

for

DS012359

Typical Constant Current/Constant Voltage

loop

LM3420 Functional Diagram

frequency

Li-Ion Battery Charger

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 µA (typ.)

Applications

n Lithium-Ion battery charging

n Suitable for linear and switching regulator charger

designs

DS012359-2

DS012359-1

www.national.com

July 2000

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