1

2

3

4

8

7

6

5

SNS

LED

BAT

VSS

MOD

VCC

TS

RC

bq2000T

www.ti.com

SLUS149D – MAY 1999 – REVISED JANUARY 2010

Programmable Multi-Chemistry Fast-Charge Management IC

Check for Samples: bq2000T

1

FEATURES

GENERAL DESCRIPTION

•

Safe Management of Fast Charge for NiCd,

NiMH, or Li-Ion Battery Packs

The bq2000T is a programmable, monolithic IC for

fast-charge management of nickel cadmium (NiCd),

•

High-Frequency Switching Controller for

nickel metal-hydride (NiMH), or lithium-ion (Li-Ion)

Efficient and Simple Charger Design

batteries in single- or multi-chemistry applications.

•

Pre-Charge Qualification for Detecting

The bq2000T chooses the proper battery chemistry

Shorted, Damaged, or Overheated Cells

(either nickel or lithium) and proceeds with the

•

Fast-Charge Termination by

ΔT/Δt for Nickel

optimal charging and termination algorithms. This

Chemistries, Minimum Current for Li-Ion

process eliminates undesirable, undercharged, or

overcharged conditions, and allows accurate and safe

Chemistries, Maximum Temperature, and

termination of fast charge.

Maximum Charge Time

•

Selectable Top-Off Mode for Achieving

Depending on the chemistry, the bq2000T provides a

Maximum Capacity in NiMH Batteries

number of charge termination criteria:

•

Rate of temperature rise (

ΔT/Δt) (for NiCd and

•

Programmable Trickle-Charge Mode for

NiMH)

Reviving Deeply Discharged Batteries and for

•

Minimum charge current (for Li-Ion)

Postcharge Maintenance

•

Maximum temperature

•

Built-in Battery Removal and Insertion

•

Maximum charge time

Detection

•

Sleep Mode for Low Power Consumption

For safety, the bq2000T inhibits fast charge until the

battery

voltage

and

temperature

are

within

APPLICATIONS

user-defined limits. If the battery voltage is below the

low-voltage

threshold,

the

bq2000T

uses

•

Multi-Chemistry Charger

trickle-charge to condition the battery. For NiMH

•

Nickel Charger

batteries, the bq2000T provides an optional top-off

•

High-Power, Multi-Cell Charger

charge to maximize the battery capacity.

The integrated high-speed comparator allows the

bq2000T

to

be

the

basis

for

a

complete,

high-efficiency

battery

charger

circuit

for

both

nickel-based and lithium-based chemistries.

spacer between para and illustration

8-Pin DIP or Narrow SOIC or TSSOP

Pin Names

SNS

Current-sense input

VSS

System ground

LED

Charge-status output

BAT

Battery-voltage input

TS

Temperature-sense input

RC

Timer-program input

VCC

Supply-voltage input

MOD

Modulation-control output

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 1999–2010, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.