NSC LM3620M5X-4, LM3620M5-8, LM3620M5-4 Datasheet

LM3620
Lithium-Ion Battery Charger Controller

General Description

The LM3620 series of controllers are monolithic integrated
circuits designed to control the charging and end-of-charge
control for lithium-ion rechargeable batteries. The LM3620 is
available in two versions for one or two cell charger applica­tions. Each version provides the option of selecting the ap­propriate termination voltage for either coke or graphite an­ode lithium cells.

The LM3620 can operate from a wide range of DC input
sources (4V to 30V). With no charger supply connected, the
controller drawsaquiescent current of only 10nA to minimize
discharging of a connected battery pack.

The LM3620 consists of an operational transconductance
amplifier,a bandgap voltage reference, a NPN driver transis­tor and precision voltage setting resistors. The output of the
amplifier is made available to drive an external power tran­sistor if higher drive currents are required.

Typical Application

With a trimmed output voltage regulation of
curacy, the LM3620 provides a simple, precise solution for
end-of-charge control of lithium-ion rechargeable cells.

The LM3620 is packaged in a miniature 5-lead SOT-23 sur­face mount package for very compact designs.

Features

n Voltage options for charging 1 or 2 cell stacks
n Adjustable output voltage for coke or graphite anodes
n Precision end-of-charge voltage control
n Wide input voltage range (4V to 30V)
n Low off state current (
n Drive provided for external power stage
n Tiny SOT-23 package

<

10nA)

June 1999

±

1.2%initial ac-

LM3620 Lithium-Ion Battery Charger Controller

DS100841-10

© 1999 National Semiconductor Corporation DS100841 www.national.com

Connection Diagram

5-Lead SOT23-5 Surface Mount Package

Refer to the Ordering Information Table in

this Data Sheet for Specific Part Number

Ordering Information

Device Order

Number

LM3620M5-4 D10B 4.1V/4.2V 1.2

LM3620M5X-4 D10B 4.1V/4.2V 1.2

LM3620M5-8 D11B 8.2V/8.4V 1.2

LM3620M5X-8 D11B 8.2V/8.4V 1.2

Package

Marking

Output

Voltage

Accuracy

See NS Package MA05B

Initial

(25˚C)

%

%

%

%

Over

Temperature

Accuracy

(0 to 70˚C)

%

2

%

2

%

2

%

2

DS100841-1

Number
of Cells

1

1

2

2

Supplied as

250 Unit increments on Tape and
Reel

3k Unit increments on Tape and
Reel

250 Unit increments on Tape and
Reel

3k Unit increments on Tape and
Reel

The small physical size of the SOT23-5 Package does not allow for the full part number marking. Devices will be marked with the
designation shown in the column Package Marking.

The devices are shipped in tape-and-reel format. The standard quantity is 250 units on a reel (indicated by the letters “M5” in the
part number), or 3000 units on a reel (indicated by the letters “M5X” in the part number).

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