Analog Devices LT3990

Description

The LTR3990 is an adjustable frequency monolithic buck switching regulator that accepts a wide input voltage range up to 62V, 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 accurate programmable undervoltage lockout feature is available, producing a low shutdown current of 0.7ƒÊA. A power good flag signals when VOUT reaches 90% of the programmed output voltage. The LT3990 is available in small, thermally enhanced 16-pin MSOP and 3mm ~ 3mm DFN packages.

Features

• Low Ripple Burst Mode® Operation2.5μA IQ at 12VIN to 3.3VOUTOutput Ripple < 5mVP-P
• Wide Input Voltage Range: 4.2V to 62V Operating
• Adjustable Switching Frequency: 200kHz to 2.2MHz
• Integrated Boost and Catch Diodes
• 350mA Output Current
• Fixed Output Voltages: 3.3V, 5V2μA IQ at 12VIN
• Accurate Programmable Undervoltage Lockout
• FMEA Fault Tolerant (MSOP Package) Output Stays at or Below Regulation Voltage DuringAdjacent Pin Short or When a Pin is Left Floating
• Low Shutdown Current: IQ = 0.7μA
• Internal Sense Limits Catch Diode Current
• Power Good Flag
• Small, Thermally Enhanced 16-Pin MSOP and (3mm × 3mm) DFN Packages

Typical applications

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

More information

• Datasheet
• IC product information