BQ24401_15 Datasheet, PDF (1/27 Pages) Texas Instruments – Programmable NiCd/NiMH Fast-Charge Management IC

bq24401
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SLUS497A – SEPTEMBER 2001 – REVISED MARCH 2010
Programmable NiCd/NiMH Fast-Charge Management IC
Check for Samples: bq24401
FEATURES
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• Safe Management of Fast Charge for NiCd and
NiMH Battery Packs
• High-Frequency Switching Controller for
Efficient and Simple Charger Design
• Pre-Charge Qualification for Detecting
Shorted, Damaged, or Overheated Cells
• Fast-Charge Termination by ΔT/Δt, Maximum
Temperature, and Maximum Charge Time
• Selectable Top-Off Mode for Achieving
Maximum Capacity in NiMH Batteries
• Programmable Trickle-Charge Mode for
Reviving Deeply Discharged Batteries and for
Postcharge Maintenance
• Built-in Battery Removal and Insertion
Detection
• Sleep Mode for Low Power Consumption
APPLICATIONS
• Nickel Charger
• High-Power, Multi-Cell Charger
8-Pin DIP or Narrow SOIC or TSSOP
SNS 1
VSS 2
LED 3
BAT 4
8 MOD
7 VCC
6 RC
5 TS
GENERAL DESCRIPTION
The bq24401 is a programmable, monolithic IC for
fast-charge management of nickel cadmium (NiCd)
and nickel metal-hydride (NiMH) in single or multi-cell
applications.
The bq24401 provides these charge termination
criteria:
• Rate of temperature rise (ΔT/Δt)
• Maximum temperature
• Maximum charge time
For safety, the bq24401 inhibits fast charge until the
battery voltage and temperature are within
user-defined limits. If the battery voltage is below the
low-voltage threshold, the bq24401 uses
trickle-charge to condition the battery. For NiMH
batteries, the bq24401 provides an optional top-off
charge to maximize the battery capacity.
The integrated high-speed comparator allows the
bq24401 to be the basis for a complete,
high-efficiency battery charger circuit for nickel-based
chemistries.
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Pin Names
SNS Current-sense input
V_SS
System ground
LED Charge-status output
BAT Battery-voltage input
TS
Temperature-sense input
RC
Timer-program input
V_CC Supply-voltage input
MOD Modulation-control output
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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