Analog Devices LT3970

Description

The LT®3970 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 diealong 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 fasttransient 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 VOUT reaches 90% of the programmed output voltage. The LT3970 is available in small 10-pin MSOP and 3mm × 2mm DFN packages.

Features

• Low Ripple Burst Mode® Operation 2.5µA IQ at 12VIN to 3.3VOUT Output Ripple < 5mVP-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, 5V1.8µA IQ at 12VIN
• Accurate 1V Enable Pin Threshold
• Low Shutdown Current: IQ = 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

Typical applications

• Industrial Supplies
• Automotive Battery Regulation
• Power for Portable Products

More information

• Datasheet
• IC product information