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UC3909 - Switchmode Lead-Acid Battery Charger

General Description

The UC3909 family of Switchmode Lead-Acid Battery Chargers accurately controls lead acid battery charging with a highly efficient average current mode control loop.

This chip combines charge state logic with average current PWM control circuitry.

Key Features

  • Accurate and Efficient Control of Battery Charging.
  • Average Current Mode Control from Trickle to Overcharge.
  • Resistor Programmable Charge Currents.
  • Thermistor Interface Tracks Battery Requirements Over Temperature.
  • Output Status Bits Report on Four Internal Charge States.
  • Undervoltage Lockout Monitors VCC and VREF.

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Datasheet Details

Part number UC3909
Manufacturer Unitrode
File Size 734.30 KB
Description Switchmode Lead-Acid Battery Charger
Datasheet download datasheet UC3909 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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UC2909 - Obsolete Device UC2909 UC3909 Switchmode Lead-Acid Battery Charger FEATURES • Accurate and Efficient Control of Battery Charging • Average Current Mode Control from Trickle to Overcharge • Resistor Programmable Charge Currents • Thermistor Interface Tracks Battery Requirements Over Temperature • Output Status Bits Report on Four Internal Charge States • Undervoltage Lockout Monitors VCC and VREF DESCRIPTION The UC3909 family of Switchmode Lead-Acid Battery Chargers accurately controls lead acid battery charging with a highly efficient average current mode control loop. This chip combines charge state logic with average current PWM control circuitry. Charge state logic commands current or voltage control depending on the charge state.