LM3622M-8.2 National Semiconductor, LM3622M-8.2 Datasheet

LM3622M-8.2

Manufacturer Part Number

LM3622M-8.2

Description

Manufacturer

National Semiconductor

Datasheets

1.LM3622M-4.2.pdf (9 pages)

2.LM3622M-4.2.pdf (9 pages)

3.LM3622M-4.2.pdf (9 pages)

Specifications of LM3622M-8.2

Case

SOIC-8

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

LM3622M-8.2

Manufacturer:

NS/国半

Quantity:

20 000

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LM3622

Lithium-Ion Battery Charger Controller

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

troller accuracy over temperature is

and

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

prietary output voltage sensing circuit drains less than

200nA from the battery when the input source is discon-

nected.

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.

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

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

30mV/cell for A grade

DS100974

low-voltage battery threshold circuitry that removes this drive

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

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.

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

n Versions for coke or graphite anode

n Precision (

n Wide input range: 4.5V-24V

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

(8.2V or 8.4V)

30mV/cell) end-of-charge control

10097401

February 2000

www.national.com

SEL

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