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AP3421B - Dual 1.0A Synchronous Step-down Converters

Download the AP3421B datasheet PDF. This datasheet also covers the AP3421 variant, as both devices belong to the same dual 1.0a synchronous step-down converters family and are provided as variant models within a single manufacturer datasheet.

General Description

The AP3421/A/B is a fully integrated dual output voltage regulator.

The two converters are current mode and internally compensated.

The converters include integrated control and synchronous rectifier switches.

Key Features

  • VO1=1.8 to 3.6V at 1A.
  • VO2=1.0 to 3.6V at 1A.
  • Switching Frequency: 1.3MHz.
  • 180° Phase Shifted Switching.
  • No Rectifier Diode Required.
  • Optional External Clocking (2× Clock Required).
  • Light Load Pulse Skipping.
  • Enable/Sleep State.
  • Internal Soft-start.
  • Open-drain Power On Reset Monitors Input and.
  • Outputs.
  • Discharge-Before-Turn-On (For AP3421/A).
  • Pre-bias Function (For AP3421B).

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (AP3421-BCDSemiconductor.pdf) that lists specifications for multiple related part numbers.

Datasheet Details

Part number AP3421B
Manufacturer BCD Semiconductor
File Size 504.93 KB
Description Dual 1.0A Synchronous Step-down Converters
Datasheet download datasheet AP3421B 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.

View original datasheet text
Preliminary Datasheet 1.3MHz, Dual 1.0A Synchronous Step-down Converters AP3421/A/B General Description The AP3421/A/B is a fully integrated dual output voltage regulator. The two converters are current mode and internally compensated. The converters include integrated control and synchronous rectifier switches. The outputs are both rated for up to 1A. Both outputs are adjustable using external resistors. The step-down converters operate at 1.3MHz fixed switching frequency under normal load and in a pulse skipping mode for light loads. The switching clock is shifted 180° for SW2. The E/S pin provides an enable function and allows the converter to be synchronized to an external clock. With E/S held low, the AP3421/A/B draws less than 10µA current.