LTC3806 Datasheet | Linear Technology

Synchronous Flyback DC/DC Controller Features - High Efficiency at Full Load - Better Cross Regulation Than Nonsynchronous Converters (Multiple Outputs) - Soft-Start Minimizes Inrush Current - Current Mode Control Provides Excellent Transient Response - High Maximum Duty Cycle: 89% Typical - ±2% Programmable Undervoltage Lockout Threshold - ±1% Internal Voltage Reference - Micropower Start-Up - Constant Frequency Operation (Never Audible) - 3mm × 4mm 12-Pin DFN Package U APPLICATIO S - 48V Tele Supplies - 12V/42V Automotive - 24V Industrial - Vo IP Phone - Power Over Ethernet DESCRIPTIO The LTC®3806 is a current mode synchronous flyback controller that drives N-channel power MOSFETs and requires very few external ponents. It is intended for medium power applications where multiple outputs are required. Synchronous rectification provides higher efficiency and improved output cross regulation than nonsynchronous converters. The IC contains all the necessary control circuitry including a 250k Hz oscillator, precision undervoltage lockout circuit with hysteresis, gate drivers for primary and synchronous switches, current mode control circuitry and soft-start circuitry. Programmable soft-start reduces inrush currents. This makes it easier to design pliant Power Over Ethernet supplies. Low start-up current reduces power dissipation in the start-up resistor and reduces the size of the external startup capacitor. The LTC3806 is available in a 12-pin, exposed pad DFN package. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATIO VIN 36V TO 72V R1...