1

2

3

4

8

7

6

5

SNS

LED

BAT

VSS

MOD

VCC

TS

RC

bq2000

www.ti.com

SLUS138D – JANUARY 2008 – REVISED DECEMBER 2009

Programmable Multi-Chemistry Fast-Charge Management IC

Check for Samples: bq2000

1

FEATURES

GENERAL DESCRIPTION

•

Safe Management of Fast Charge for NiCd,

NiMH, or Li-Ion Battery Packs

The bq2000 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 bq2000 chooses the proper battery chemistry

Shorted, Damaged, or Overheated Cells

(either nickel or lithium) and proceeds with the

•

Fast-Charge Termination by Peak Voltage

optimal charging and termination algorithms. This

(PVD) for Nickel chemistries, Minimum Current

process eliminates undesirable, undercharged, or

overcharged conditions, and allows accurate and safe

for Li-Ion chemistries, Maximum Temperature,

termination of fast charge

and Maximum Charge Time

•

Selectable Top-Off Mode for Achieving

Depending on the chemistry, the bq2000 provides a

Maximum Capacity in NiMH Batteries

number of charge termination criteria:

•

Peak voltage, PVD (for NiCd and NiMH)

•

Programmable Trickle-Charge Mode for

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

For safety, the bq2000 inhibits fast charge until the

•

Sleep Mode for Low Power Consumption

battery

voltage

and

temperature

are

within

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

APPLICATIONS

low-voltage threshold, the bq2000 uses trickle-charge

to condition the battery. For NiMH batteries, the

•

Multi-Chemistry Charger

bq2000 provides an optional top-off charge to

•

Nickel Charger

maximize the battery capacity.

•

High-Power, Multi-Cell Charger

The integrated high-speed comparator allows the

bq2000 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 © 2008–2009, 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.