60V, 3A, 2MHz Step-Down Switching Regulator with 2.7μA Quiescent Current

The LT3995 is an adjustable frequency monolithic buck switching regulator that accepts a wide input voltage range up to 60V. Low quiescent current design consumes only 2.7μA of supply current while regulating with no load. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping the output ripple below 15mV in a typical application. The LT3995 can supply up to 3A of load current and has current limit foldback to limit power dissipation during short circuit. A low dropout voltage of 500mV is maintained when the input voltage drops below the programmed output voltage, such as during automotive cold crank.

An internally compensated current mode topology is used for fast transient response and good loop stability. A high efficiency 85mΩ switch is included on the die along with a boost Schottky diode and the necessary oscillator, control, and logic circuitry. An accurate 1.02V threshold enable pin can be driven directly from a microcontroller or used as a programmable undervoltage lockout. A capacitor on the SS pin provides a controlled inrush current (soft-start). A power good flag signals when VOUT reaches 91.6% of the programmed output voltage. The LT3995 is available in a small 16-lead MSOP package with exposed pad for low thermal resistance.

APPLICATIONS

* Automotive Battery Regulation

* Portable Products

* Industrial Supplies

* Ultralow Quiescent Current: 2.7μA IQ at 12VIN to 3.3VOUT

* Low Ripple Burst Mode® Operation Output Ripple < 15mVP-P

* Wide Input Range: Operation from 4.3V to 60V

* 3A Maximum Output Current

* Excellent Start-Up and Dropout Performance

* Adjustable Switching Frequency: 200kHz to 2MHz

* Synchronizable Between 250kHz to 2MHz

* Accurate Programmable Undervoltage Lockout