Texas Instruments bq2000T User Guide and Manual

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bq2000T

Programmable Multi-Chemistry Fast-Charge Management IC

For safety, the bq2000T inhibits fast

Features General Description

charge until the battery voltage and temperature are within user-defined

Safe management of fast The bq2000T is programmable,

limits. If the battery voltage is below

charge for Ni Cd, Ni MH, or Li- monolithic IC for fast-charge manage-

the low-voltage threshold, the

Ion battery packs ment of nickel cadmium (Ni Cd),

bq2000T uses trickle-charge to

nickel metal-hydride (Ni MH), or lith-

High-frequency switching con- condition the battery. For Ni MH

ium-ion (Li-Ion) batteries in single- or

troller for efficient and simple batteries, the bq2000T provides an

multi-chemistry applications. The

charger design optional top-off charge to maximize

bq2000T detects the battery chemis-

the battery capacity.

try and proceeds with the optimal

Pre-charge qualification for

charging and termination algorithms. The integrated high-frequency com-

detecting shorted, damaged, or

This process eliminates undesirable parator allows the bq2000T to be the

overheated cells

undercharged or overcharged condi- basis for complete, high-efficiency

Fast-charge termination by tions and allows accurate and safe power-conversion circuit for both

∆T/∆t minimum current termination of fast charge. nickel-based and lithium-based

(Li-Ion), maximum tempera- chemistries.

Depending on the chemistry, the

ture, and maximum charge

bq2000T provides number of

charge termination criteria:

Selectable top-off mode for

Rate of temperature rise, ∆T/∆t (for

achieving maximum capacity in

Ni Cd and Ni MH)

Ni MH batteries

Minimum charging current (for

Programmable trickle-charge

Li-Ion)

mode for reviving deeply dis- charged batteries and for post-

Maximum temperature

charge maintenance

Maximum charge time

Built-in battery removal and insertion detection

Sleep mode for low power consumption

Pin Connections Pin Names

SNS Current-sense input TS Temperature-sense

input

VSS System ground

SNS MOD RC Timer-program input

LED Charge-status

output VCC Supply-voltage input

VSS VCC

BAT Battery-voltage MOD Modulation-control

LED RC input output

BAT TS

8-Pin DIP or Narrow SOIC or TSSOP

PN-2000.eps

SLUS149A–FEBRUARY 2000