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

Adj UVLO, Sync & Tracking

Package

LTC3810

Vin 6.2V to 100V, 10V Driver Voltage

Yes

SSOP-28

LTC3810-5

Vin 4.35V to 60V, 5.5V Driver Voltage

Yes

QFN-32

LTC3812-5

Vin 4.35 to 60V, 5.5V Driver Voltage

No

TSSOP-16E

Applications

* 48V Telecom and Base Station Power Supplies

* Networking Equipment, Servers

* Automotive and Industrial Control Systems

* 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