LM3621 - Single Cell Lithium-Ion Battery Charger Controller [Discontinued]
Datasheet Obsolete Versions Reliability Knowledge Base

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
•Charge interruption control input

Key Specification

•Tight output voltage accuracy (±0.5% at TA = 25°C)
•Two selectable output voltages (4.2V or 4.1V)
•Less than 1 µA current drain from fully charged battery
•Preconditioning severely discharged cells (0V to 2.55V)

General Description

The LM3621 is a full function constant voltage, constant current (CVCC) lithium-ion (Li+) battery charger controller. More...


Applications

•Complete, full function, protected battery charger for coke or graphite anode, single cell Lithium-Ion battery packs
•Linear voltage regulator controlled chargers
•High efficiency switching regulator controlled chargers
•Cost effective wall adapter chargers
  Typical Application
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Typical Performance

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  Block Diagram
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Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM3621 Single Cell Lithium-Ion Battery Charger Controller 377
Kbytes		 4-Oct-04 Download
LM3621 Single Cell Lithium-Ion Battery Charger Controller (Japanese)
 200 Kbytes   Download

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Obsolete Versions

Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM3621M
LP3941LQ-A
NATIONAL SEMICONDUCTOR
15 Dec 2008
LM3621MX
NONE
NATIONAL SEMICONDUCTOR
16 Nov 2008

General Description

The LM3621 is a full function constant voltage, constant current (CVCC) lithium-ion (Li+) battery charger controller. It provides 1% regulation accuracy over the specified temperature range without requiring the use of external precision resistors. 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 current control loops.

The LM3621 is designed to control a switching charger, a linear charger or an off-line ac adapter charger.

The LM3621 consists of a logic controller, precision bandgap reference, wide bandwidth transconductance error amplifiers, comparators, and an output buffer. The LM3621 is available in a 16-pin SOIC package and is specified over the range of 0°C to 70°C.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM3621MCS1001142117108980004254809951

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


[Information as of 8-Nov-2009]