LTC3812-5 Datasheet | Linear Technology

Features n High Voltage Operation: Up to 60V n Large 1Ω Gate Drivers n No Current Sense Resistor Required n Dual N-Channel MOSFET Synchronous Drive n Extremely Fast Transient Response n ±0.5% 0.8V Voltage Reference n Programmable Soft-Start n Generates 5.5V Driver Supply n Selectable Pulse-Skipping Mode Operation n Power Good Output Voltage Monitor n Adjustable On-Time/Frequency: t ON(MIN) < 100ns n Adjustable Cycle-by-Cycle Current Limit n Undervoltage Lockout On Driver Supply n Output Overvoltage Protection n Thermally Enhanced 16-Pin TSSOP Package APPLICATIONS n 48V Tele and Base Station Power Supplies n Networking Equipment, Servers n Automotive and Industrial Control Systems 60V Current Mode Synchronous Switching Regulator Controller DESCRIPTION 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 tele 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 pensated 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 shortcircuit occurs, with the addition of a small external SOT23 MOSFET. When in regulation, power is derived from the output for higher efficiency. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the...