Texas Instruments bq2000 User's Manual
Summary
The bq2000 is a programmable IC designed for safe, highly efficient multi-chemistry fast charging. It automatically supports NiCd, NiMH, and Li-Ion batteries in single or mixed-chemistry applications while ensuring optimal capacity management. This technical manual provides comprehensive operational details, including state diagrams, charge qualification processes, and pin descriptions necessary for system designers implementing robust, custom power solutions with precise control over voltage and current thresholds.
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bq2000
Programmable Multi-Chemistry Fast-Charge Management IC
Features General Description
For safety, the bq2000 inhibits fast charge until the battery voltage and
Safe management of fast The bq2000 is programmable, temperature are within user-defined charge for Ni Cd, Ni MH, or Li- monolithic IC for fast-charge manage- limits. If the battery voltage is Ion battery packs ment of nickel cadmium (Ni Cd), below the low-voltage threshold, the
nickel metal-hydride (Ni MH), or lith- bq2000 uses trickle-charge to
High-frequency switching con-
ium-ion (Li-Ion) batteries in single- or condition the battery. For Ni MH
troller for efficient and simple
multi-chemistry applications. The batteries, the bq2000 provides an
charger design
bq2000 detects the battery chemistry optional top-off charge to maximize and proceeds with the optimal charg- the battery capacity.
Pre-charge qualification for
ing and termination algorithms. This
detecting shorted, damaged, or
The integrated high-frequency com-
process eliminates undesirable under-
overheated cells
parator allows the bq2000 to be the
charged or overcharged conditions
Fast-charge termination by basis for complete, high-efficiency
and allows accurate and safe termi-
peak voltage (PVD), minimum power-conversion circuit for both
nation of fast charge.
current (Li-Ion), maximum nickel-based and lithium-based
Depending on the chemistry, the chemistries.
temperature, and maximum
bq2000 provides number of charge
charge time
termination criteria:
Selectable top-off mode for
Peak voltage, PVD (for Ni Cd and
achieving maximum capacity in
Ni MH)
Ni MH batteries
Minimum charging current (f or
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
RC Timer-program input
SNS MOD 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
SLUS138B–FEBRUARY
Page Summary Contents For Texas Instruments bq2000 User's Manual
Manual Details
| Brand | Texas Instruments |
|---|---|
| Pages | 18 |
| File Size | 382.50 KB |
| Published | June 01, 2026 |
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Frequently Asked Questions
What types of batteries can the bq2000 manage?
It is a multi-chemistry IC designed to handle NiCd, NiMH, and Li-Ion battery packs.
How does the unit protect the battery during charging?
The integrated high-frequency power-conversion circuit eliminates undesirable overcharged or overheated cells.
Which pins are used for setting charge limits?
The RC input (Ren) is used to program maximum charge-time, hold-off period, and trickle rate, among other settings.
Is the bq2000 suitable for deep discharge recovery?
Yes, it includes a specialized 'Programmable trickle-charge' Li-Ion mode designed for reviving deeply discharged batteries.