LTC3772B

PRODUCTION

Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller

Analog Devices LTC3772B Product Info

10 February 2026 5

Features

No Current Sense Resistor Required
High Output Currents Easily Achieved
Internal Soft-Start Ramps V_OUT
Wide V_INRange: 2.75V to 9.8V
Low Dropout: 100% Duty Cycle
Constant Frequency 550kHz Operation
Low Ripple Pulse Skipping Operation at Light Load

Output Voltage as Low as 0.8V
±1.5% Voltage Reference Accuracy
Current Mode Operation for Excellent Line and Load Transient Response
Only 8μA Supply Current in Shutdown
Low Profile 8-Lead SOT-23 (1mm) and (3mm × 2mm) DFN (0.75mm) Packages

Part details & applications

The LTC3772B is a constant frequency current mode step-down DC/DC controller in a low profile 8-lead SOT-23 (ThinSOT^™) and a 3mm × 2mm DFN package. The No R_SENSE^™ architecture eliminates the need for a current sense resistor, improving efficiency and saving board space.

The LTC3772B automatically switches into pulse skipping operation at light loads. It consumes only 200μA of quiescent current under a no-load condition.

The LTC3772B incorporates an undervoltage lockout feature that shuts down the device when the input voltage falls below 2V. To maximize the runtime from a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle). High switching frequency of 550kHz allows the use of a small inductor and capacitors. An internal soft-start smoothly ramps the output voltage from zero to its regulation point.


	Burst Mode
LTC3772	Yes
LTC3772B	No

Applications

1- or 2-Cell Li-Ion Battery-Powered Applications
Wireless Devices
Portable Computers
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