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LTC3672B-1 Datasheet Monolithic Fixed-Output 400mA Buck Regulator

Manufacturer: Linear Technology (now Analog Devices)

Overview: LTC3672B-1 Monolithic Fixed-Output 400mA Buck Regulator with Dual 150mA LDOs in 2mm × 2mm.

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General Description

The LTC®3672B-1 is a triple power supply composed of a 400mA synchronous buck regulator and two 150mA lowdropout linear regulators (LDOs), where one of the LDOs can be powered from the buck output to improve efficiency.

Constant-frequency 2.25MHz operation is maintained down to very light loads.

The input supply range of 2.9V to 5.5V is especially well-suited for single-cell Lithium-Ion and Lithium-Polymer applications, and for powering low voltage ASICs from 3.3V or 5V rails.

Key Features

  • Triple Output Supply From a Single 2.9V to 5.5V Input.
  • Buck DC/DC: Fixed 1.8V Output, Up to 400mA.
  • LDO1: Fixed 1.2V Output, Up to 150mA.
  • LDO2: Fixed 2.8V Output, Up to 150mA.
  • ±2.5% Reference Accuracy.
  • Constant Frequency 2.25MHz Operation.
  • Minimum External Component Count.
  • Current Mode Operation for Excellent Line and Load Transient Response.
  • Internal Soft-Start for Each Output.
  • Single Enable Pin Turns On/Shuts Down All Three Outputs.
  • Tiny 2.

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