LTC3670

PRODUCTION

Monolithic 400mA Buck Regulator with Dual 150mA LDOs in 3mm × 2mm DFN

Analog Devices LTC3670 Product Info

10 February 2026 8

Features

Triple Output Supply from a Single 2.5V to 5.5V Input
400mA Buck DC/DC Plus Dual 150mA LDOs in One IC
Outputs Regulate Down to 0.8V
±2.5% Reference Accuracy

Constant-Frequency 2.25MHz Operation
Independent Enable Pin for Each Output
Internal Soft-Start for Each Output
See datasheet for additional features

Part details & applications

The LTC3670 is a triple power supply composed of a 400mA synchronous buck regulator and two 150mA low dropout linear regulators (LDOs). The input supply range of 2.5V to 5.5V is especially well-suited for single-cell Lithium-Ion and Lithium-Ion/Polymer applications, and for powering low voltage ASICs and SoCs from 3V, 3.3V or 5V rails. Regulated output voltages are programmed via external resistors. Each output has its own enable pin for maximum flexibility.

The 400mA buck regulator features constant-frequency 2.25MHz operation, allowing small surface mount inductors and capacitors to be used. Burst Mode operation maintains high efficiency in light-load and no-load conditions. Internal control-loop compensation simplifies application design.

The LTC3670 is available in a 0.75mm profile, 3mm × 2mm 12-lead DFN package.

APPLICATIONS

Handheld Products
Portable Instruments
Single-Cell Li-Ion/Li-Polymer Powered Devices
DMB/DVB-H Multimedia Cell Phones
Multivoltage Power for Digital Logic, I/O, FPGAs, CPLDs, ASICs, SoCs, CPUs and RF Chipsets

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