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LM3621M Datasheet

  • LM3621M

  • National Semiconductor [Single Cell Lithium-Ion Battery Cha...

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LM3621 Single Cell Lithium-Ion Battery Charger Controller
March 1998
LM3621
Single Cell Lithium-Ion Battery Charger Controller
General Description
The LM3621 is a full function constant voltage, constant cur-
rent (CVCC) lithium-ion (Li+) battery charger controller. It
provides 1% regulation accuracy over the specified tempera-
ture range without requiring the use of external precision re-
sistors. The IC controls five charge modes: conditioning,
fast, top-off, monitor and maintenance. In addition, the
LM3621 detects and flags defective batteries as well as over
current and over voltage fault events. The architecture of the
IC is based on high gain constant voltage and constant cur-
rent control loops.
The LM3621 is designed to control a switching charger, a lin-
ear charger or an off-line ac adapter charger.
The LM3621 consists of a logic controller, precision bandgap
reference, wide bandwidth transconductance error amplifi-
ers, comparators, and an output buffer. The LM3621 is avail-
able in a 16-pin SOIC package and is specified over the
range of 0藲C to 70藲C.
n
Less than 1 碌A current drain from fully charged battery
n
Preconditioning severely discharged cells (0V to 2.55V)
Features
Automatic end-of-charge control
Preset or user adjustable charge current regulation
LED drivers for charging status and fault indication
Battery self-discharge refresh (maintenance)
Overvoltage/overcurrent fault detection and protection
Defective battery pack detection
Charge current boost control for cellular phone
applications
n
Charge interruption control input
n
n
n
n
n
n
n
Applications
n
Complete, full function, protected battery charger for
coke or graphite anode, single cell Lithium-Ion battery
packs
n
Linear voltage regulator controlled chargers
n
High efficiency switching regulator controlled chargers
n
Cost effective wall adapter chargers
Key Specifications
n
Tight output voltage accuracy (
卤
0.5% at T
A
= 25藲C)
n
Two selectable output voltages (4.2V or 4.1V)
Typical Application
DS100107-7
1A, 4.1V CVCC Linear Charger for Graphite Anode Lithium-Ion Battery
漏 1998 National Semiconductor Corporation
DS100107
www.national.com

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