LTC3872

PRODUCTION

No RSENSE Current Mode Boost DC/DC Controller

Analog Devices LTC3872 Product Info

10 February 2026 8

Features

No Current Sense Resistor Required
V_OUT up to 60V
Constant Frequency 550kHz Operation
Internal Soft-Start and Optional External Soft-Start
Adjustable Current Limit
Pulse Skipping at Light Load

V_IN Range: 2.75V to 9.8V
±1.5% Voltage Reference Accuracy
Current Mode Operation for Excellent Line and Load Transient Response
Low Profile (1mm) SOT-23 and 2mm × 3mm DFN Packages

Part details & applications

The LTC3872 is a constant frequency current mode boost DC/DC controller that drives an N-channel power MOSFET and requires very few external components. The No R_SENSE^™ architecture eliminates the need for a sense resistor, improves efficiency and saves board space.

The LTC3872 provides excellent AC and DC load and line regulation with ±1.5% output voltage accuracy. It incorporates an undervoltage lockout feature that shuts down the device when the input voltage falls below 2.3V.

High switching frequency of 550kHz allows the use of a small inductor. The LTC3872 is available in an 8-lead low profile (1mm) ThinSOT^™ package and 8-pin 2mm × 3mm DFN package.

	LTC3872	LTC3872-1
Frequency Foldback In Current Limit	Yes	No

Applications

Telecom Power Supplies
42V Automotive Systems
24V Industrial Controls
IP Phone Power Supplies

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