LT3980

LT3980 58V, 2A, 2.4MHz Step-Down Switching Regulator with 85µA Quiescent Current Features ■ Wide Input Range: Operation from 3.6V to 58V ■ Overvoltage Lockout Protects Circuits Through 80V Transients ■ 2A Maximum Output Current ■ Low Ripple (<15mVP-P) Burst Mode® Operation: IQ = 85µA at 12VIN to 3.3VOUT ■ Adjustable Switching Frequency: 100kHz to 2.4MHz ■ Low Shutdown Current: IQ < 1µA ■ Catch Diode Current Sense Protects Circuit Through Short-Circuit and Input Overvoltage ■ Synchronizable Between 250kHz to 2MHz ■ Power Good Flag ■ Saturating Switch Design: 200mΩ On-Resistance ■ Thermal Protection ■ Soft-Start Capability ■ Small 16-Pin Thermally Enhanced MSOP and 3mm × 4mm DFN Packages Applications ■ Automotive Battery Regulation ■ Distributed Supply Regulation ■ Industrial Supplies ■ Wall Transformer Regulation Description The LT®3980 is an adjustable frequency (100kHz to 2.4MHz) monolithic buck switching regulator that accepts input voltages up to 58V (80V transient). A high efficiency 200mΩ switch is included on the die along with a boost Schottky diode and the necessary oscillator, control, and logic circuitry. Current mode topology is used for fast transient response and good loop stability. Catch diode current sense (DA pin) protects the circuit during input voltage transients even when a high switching frequency is used. Low ripple Burst Mode operation maintains high efficiency at low output currents while keeping output ripple below 15mV in a typical application....