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LTC3672B-1
  • LTC3672B-1
  • LTC3672B-1
  • LTC3672B-1

LTC3672B-1

PRODUCTION

Monolithic Fixed-Output 400mA Buck Regulator with Dual 150mA LDOs in 2mm x 2mm DFN

Analog Devices LTC3672B-1 Product Info

10 February 2026 4

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 2mm x 2mm x 0.75mm DFN Package

The LTC3672B-1 is a triple power supply composed of a 400mA synchronous buck regulator and two 150mA low dropout 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.

The LTC3672B-1 regulates 1.8V at the buck output, 1.2V at the LDO1 output, and 2.8V at the LDO2 output. External component count is minimal—all that is needed is a single inductor, an input capacitor, and output capacitors for each of the three outputs. Control loop compensation is internal to the LTC3672B-1.

The LTC3672B-1 is available in a 2mm x 2mm x 0.75mm 8-Lead DFN package.

Part details & applications

The LTC3672B-1 is a triple power supply composed of a 400mA synchronous buck regulator and two 150mA low dropout 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.

The LTC3672B-1 regulates 1.8V at the buck output, 1.2V at the LDO1 output, and 2.8V at the LDO2 output. External component count is minimal—all that is needed is a single inductor, an input capacitor, and output capacitors for each of the three outputs. Control loop compensation is internal to the LTC3672B-1.

The LTC3672B-1 is available in a 2mm x 2mm x 0.75mm 8-Lead DFN package.

Buck VOUT LDO 1 LDO 2
LTC3672B-1 1.8V 1.2V 2.8V
LTC3672B-2
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