DESCRIPTION
The LT®3681 is an adjustable frequency (300kHz to 2.8MHz) monolithic buck switching regulator that accepts input voltages up to 34V (36V maximum). A high effi ciency 0.18Ω switch is included on the die along with a boost Schottky diode and the necessary oscillator, control, and logic circuitry. An undedicated power Schottky diode is integrated into the LT3681 to minimize the solution size.

FEATURES
■ Wide Input Voltage Range: 3.6V to 34V Operating,
   36V Maximum
■ 2A Maximum Output Current
■ Low Ripple Burst Mode® Operation
   50µA IQ at 12VIN to 3.3VOUT
   Output Ripple < 15mVP-P
■ Adjustable Switching Frequency: 300kHz to 2.8MHz
■ Low Shutdown Current: IQ < 1µA
■ Integrated Boost Diode
■ Integrated Power Schottky Diode
■ Power Good Flag
■ Saturating Switch Design: 0.18Ω On-Resistance
■ 1.265V Feedback Reference Voltage
■ Output Voltage: 1.265V to 20V
■ Soft-Start Capability
■ Small 14-Pin Thermally Enhanced
   (4mm x 3mm) DFN Package

APPLICATIONS
■ Automotive Battery Regulation
■ Power for Portable Products
■ Distributed Supply Regulation
■ Industrial Supplies
■ Wall Transformer Regulation