LT3970

RECOMMENDED FOR NEW DESIGNS

40V, 350mA Step-Down Regulator with 2.5μA Quiescent Current and Integrated Diodes

Analog Devices LT3970 Product Info

10 February 2026 5

Features

Low Ripple Burst Mode^® Operation
- 2.5µA I_Q at 12V_IN to 3.3V_OUT
- Output Ripple < 5mV_P-P
Wide Input Voltage Range: 4.2V to 40V Operating
Adjustable Switching Frequency: 200kHz to 2.2MHz
Integrated Boost and Catch Diodes
350mA Output Current
Fixed Output Voltages:
- 3.3V, 3.42V, 5V
- 1.8μA I_Q at 12V_IN

Accurate 1V Enable Pin Threshold
Low Shutdown Current: I_Q = 0.7μA
Internal Sense Limits Catch Diode Current
Power Good Flag
Output Voltage: 1.21V to 25V
Internal Compensation
Small 10-Pin MSOP and (3mm × 2mm) DFN Packages
AEC-Q100 Qualified for Automotive Applications

Part details & applications

The LT3970 is an adjustable frequency monolithic buck switching regulator that accepts a wide input voltage range up to 40V, and consumes only 2.5μA of quiescent current. A high efficiency switch is included on the die along with the catch diode, boost diode, and the necessary oscillator, control and logic circuitry. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping the output ripple below 5mV in a typical application. Current mode topology is used for fast transient response and good loop stability. A catch diode current limit provides protection against shorted outputs and overvoltage conditions. An enable pin with accurate threshold is available, producing a low shutdown current of 0.7μA. A power good flag signals when V_OUT reaches 90% of the programmed output voltage. The LT3970 is available in small 10-pin MSOP and 3mm × 2mm DFN packages.

Applications

Automotive Battery Regulation
Power for Portable Products
Industrial Supplies

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