LT3514

FEATURES n Wide Input Voltage Range: 3.2V to 36V (40V Transient) n Three Outputs: 2A, 1A, 1A n 100% Duty Cycle Operation n Resistor-Programmed Constant Frequency n Short-Circuit Robust n Wide SYNC Range: 350kHz to 2.2MHz n Anti-Phase Switching Reduces Ripple n Feedback Voltage: 800mV n Independent Run/Soft-Start Pins n Shutdown with UVLO n Internal Compensation n Thermal Shutdown n Tiny 28-Lead (4mm × 5mm) Thermally Enhanced QFN Package n 24-Lead Exposed Pad TSSOP APPLICATIONS n Automotive Battery Regulation n Industrial Control Supplies n Wall Transformer Regulation n Distributed Supply Regulation LT3514 Triple Step-Down Switching Regulator with 100% Duty Cycle Operation DESCRIPTION The LT®3514 consists of three buck regulators (2A, 1A, 1A output current). The device has a wide operating input range of 3.2V to 36V. An on-chip boost regulator allows each channel to operate up to 100% duty cycle. The LT3514 is designed to minimize external component count and results in a simple and small application circuit. The LT3514 operates robustly in fault conditions. Cycleby-cycle peak current limit and catch diode current limit sensing protect the IC during overload conditions. Thermal shutdown protects the power switches at elevated temperatures. Soft-start helps control the peak inductor current during startup. The LT3514 also features output voltage tracking and sequencing, programmable frequency, programmable undervoltage lockout, and a power good pin to indicat...