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LT3514 - Triple Step-Down Switching Regulator with 100% Duty Cycle Operation

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 indicate when all outputs are in regulation.

The LT3514 has one fewer channel (CH2) than the LT3504, and has one channel (CH3) that outputs 2A instead of 1A. The LT3514 in QFN is pin compatible with the LT3504. The LT3504 provides four 1A outputs.

Features Wide Input Voltage Range: 3.2V to 36V (40V Transient) Three Outputs: 2A, 1A, 1A 100% Duty Cycle Operation Resistor-Programmed Constant Frequency Short-Circuit Robust Wide SYNC Range: 350kHz to 2.2MHz Anti-Phase Switching Reduces Ripple Feedback Voltage: 800mV Independent Run/Soft-Start Pins Shutdown with UVLO Internal Compensation Thermal Shutdown Tiny 28-Lead (4mm × 5mm) Thermally Enhanced QFN Package 24-Lead Exposed Pad TSSOP Typical Application

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

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