Datasheet > LM3622AMX-8.4

LM3622AMX-8.4

更新时间： 2024-11-03 22:05:39

品牌	Logo	应用领域
美国国家半导体 - NSC		电池控制器
页数	文件大小	规格书
9页	174K
描述
Lithium-Ion Battery Charger Controller

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LM3622AMX-8.4 数据手册

February 2000

LM3622

Lithium-Ion Battery Charger Controller

low-voltage battery threshold circuitry that removes this drive

when the cell voltage drops below a preset limit. The LV_SEL

pin programs this threshold voltage to either 2.7V/cell or

2.15V/cell. The low-voltage detection, which is a user en-

abled feature, provides an output signal that can be used to

enable a ″wake up charge″ source automatically to precon-

dition a deeply discharged pack.

General Description

The LM3622 is a charge controller for Lithium-Ion batteries.

This monolithic integrated circuit accurately controls an ex-

ternal pass transistor for precision Lithium-Ion battery charg-

ing. The LM3622 provides a constant voltage or constant

current (CVCC) configuration that changes, as necessary, to

optimally charge lithium-ion battery cells. Voltage charging

versions (4.1V, 4.2V, 8.2V, and 8.4V) are available for one or

two cell battery packs and for coke or graphite anode battery

chemistry.

The LM3622 is available in a standard 8-lead SOIC surface

mount package.

Features

n Versions for charging of 1 cell (4.1V or 4.2V) or 2 cells

(8.2V or 8.4V)

The LM3622 accepts input voltages from 4.5V to 24V. Con-

troller accuracy over temperature is 30mV/cell for A grade

and 50mV/cell for the standard grade. No precision exter-

n Versions for coke or graphite anode

nal resistors are required. Furthermore, the LM3622’s propri-

etary output voltage sensing circuit drains less than 200nA

from the battery when the input source is disconnected.

n Precision ( 30mV/cell) end-of-charge control

n Wide input range: 4.5V-24V

The LM3622 circuitry includes functions for regulating the

charge voltage with a temperature compensated bandgap

reference and regulating the current with an external sense

resistor. The internal bandgap insures excellent controller

performance over the operating temperature and input sup-

ply range.

n Low battery drain leakage: 200nA

n 15 mA available to drive low cost PNP

Applications

n Cellular phone cradle charger

n PDA/Notebook cradle charger

n Camcorder cradle charger

The LM3622 can sink 15mA minimum at the EXT pin to drive

the base of an external PNP pass transistor. It also has

Typical Application

DS100974-1

DS100974

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