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BQ24400
  • BQ24400
  • BQ24400

BQ24400

ACTIVE

Switch-mode NiCd/NiMH Battery Charger with Peak Voltage Detection Termination

Texas Instruments BQ24400 Product Info

1 April 2026 4

Parameters

Rating

Catalog

Number of series cells

1, 2, 3, 4

Cell chemistry

NiCd, NiMH

Charge current (max) (A)

2

Features

BAT temp thermistor monitoring (hot/cold profile)

Vin (min) (V)

4

Vin (max) (V)

6

Absolute max Vin (max) (V)

7

Control topology

Switch-Mode Buck

Battery charge voltage (min) (V)

0.95

Battery charge voltage (max) (V)

8

Control interface

Standalone (RC-Settable)

Operating temperature range (°C)

-20 to 70

Package

SOIC (D)-8-29.4 mm² 4.9 x 6

Features

  • 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 Peak Voltage (PVD), 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

  • 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 Peak Voltage (PVD), 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

Description

The bq24400 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 bq24400 provides these charge termination criteria:

  • Peak voltage, PVD
  • Maximum temperature
  • Maximum charge time

For safety, the bq24400 inhibits fast charge until the battery voltage and temperature are within user-defined limits. If the battery voltage is below the low-voltage threshold, thebq24400 uses trickle-harge to condition the battery. For NiMH batteries, the bq24400 provides an optional top-off charge to maximize the battery capacity.

The integrated high-speed comparator allows the bq24400 to be the basis for a complete, high-efficiency battery charger circuit for nickel-based chemistries.

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