LTC3708 Datasheet | Linear Technology

Features n Very Low Duty Factor Operation (t ON(MIN) < 85ns) n No RSENSE Option for Maximum Efficiency n Very Fast Transient Response n Programmable Output Voltage Up/Down Tracking n 2-Phase Operation Reduces Input Capacitance n 0.6V ±1% Output Voltage Reference n External Frequency Synchronization n Monotonic Soft-Start n Onboard High Current MOSFET Drivers n Wide VIN Range: Up to 36V n Adjustable Cycle-by-Cycle Current Limit n Instant Output Overvoltage Protection n Optional Short-Circuit Shutdown Timer n Power Good Output with 100µs Masking n Available in 5mm × 5mm QFN Package APPLICATIONS n Digital Signal Processors n Network Servers Fast 2-Phase, No RSENSE Buck Controller with Output Tracking DESCRIPTION The LTC®3708 is a dual, 2-phase synchronous step-down switching regulator with output voltage up/down tracking capability. The IC allows either coincident or ratiometric tracking. Multiple LTC3708s can be daisy-chained in applications requiring more than two voltages to be tracked. Power supply sequencing is acplished using an external soft-start timing capacitor. The LTC3708 uses a constant on-time, valley current mode control architecture to deliver very low duty factors without requiring a sense resistor. Operating frequency is selected by an external resistor and is pensated for variations in input supply voltage. An internal phase-locked loop allows the IC to be synchronized to an external clock. Fault protection is provided by an output overvoltage parator and an optional short-circuit shutdown timer. The regulator current limit level is user programmable. A wide supply range allows voltages as high as 36V to be stepped down to 0.6V output. L, LT, LTC, LTM, Linear Technology, the Linear logo and Poly Phase are registered trademarks and No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION High Efficiency Dual Output Step-Down Converter 5V 10µF...