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LTC3812-5 - 60V Current Mode Synchronous Switching Regulator Controller

The LTC3812-5 is a synchronous step-down switching regulator controller that can directly step down voltages from up to 60V input, making it ideal for telecom and automotive applications. The LTC3812-5 uses a constant on-time valley current control architecture to deliver very low duty cycles with accurate cycle-by-cycle current limit without requiring a sense resistor.

A precise internal reference provides 0.5% DC accuracy. A high bandwidth (25MHz) error amplifier provides very fast line and load transient response. Large 1Ω gate drivers allow the LTC3812-5 to drive large power MOSFETs for higher current applications. The operating frequency is selected by an external resistor and is compensated for variations in VIN. A shutdown pin allows the LTC3812-5 to be turned off reducing the supply current to <230μA.

Integrated bias control generates gate drive power from the input supply during start-up and when an output short-circuit occurs, with the addition of a small external SOT23 MOSFET. When in regulation, power is derived from the output for higher efficiency.

Features High Voltage Operation: Up to 60V Large 1Ω Gate Drivers No Current Sense Resistor Required Dual N-Channel MOSFET Synchronous Drive Extremely Fast Transient Response ±0.5% 0.8V Voltage Reference Programmable Soft-Start Generates 5.5V Driver Supply Selectable Pulse-Skipping Mode Operation Power Good Output Voltage Monitor Adjustable On-Time/Frequency: tON(MIN) < 100ns Adjustable Cycle-by-Cycle Current Limit Undervoltage Lockout On Driver Supply Output Overvoltage Protection Thermally Enhanced 16-Pin TSSOP Package Typical Application

Applications 48V Telecom and Base Station Power Supplies Networking Equipment, Servers Automotive and Industrial Control Systems Packaging

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