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LT3504 - Quad 40V/1A Step-Down Switching Regulator with 100% Duty Cycle Operation

The LT®3504 consists of four 1A output current buck regulators. The LT3504 has a wide operating input range of 3.2V to 40V. An on-chip boost regulator allows each channel to operate up to 100% duty cycle and eliminates the need for four external charge pump circuits. The LT3504 is designed to minimize external component count and results in a simple and small application circuit.

The LT3504 operates robustly in fault conditions. Cycleby- cycle peak current limit and catch diode current limit sensing protect the part during overload conditions. Thermal shutdown protects the power switches at elevated temperatures. Soft-start helps keep the peak inductor current under control during startup.

The LT3504 also features output voltage tracking and sequencing, programmable frequency, programmable undervoltage lockout, and a power good pin to indicate when all outputs are in regulation.

Features Wide Input Range: 3.2V to 40V Four 1A Outputs 100% Duty Cycle Operation Resistor-Programmed Constant Frequency Short-Circuit Robust Wide SYNC Range: 350kHz to 2.2MHz Anti-Phase Switching Reduces Ripple 800mV FB Voltage Independent Run/Soft-Start Pins Shutdown with UVLO Internal Compensation Thermal Shutdown Tiny 28-Lead (4mm × 5mm) Thermally Enhanced QFN Package Typical Application

Applications Automotive Battery Regulation Industrial Control Supplies Wall Transformer Regulation Distributed Supply Regulation Packaging

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