LTC1703 Datasheet | Linear Technology

LTC1703 Dual 550k Hz Synchronous 2-Phase Switching Regulator Controller with 5-Bit VID Features s s DESCRIPTIO s s s s s s s s s s U APPLICATIO S s s s s Two Independent PWM Controllers in One Package Side 1 Output Is pliant with Intel Mobile VID Specifications (Includes 5-Bit DAC) 0.9V to 2.0V Output Voltage with 25m V/50m V Steps Two Sides Run Out-of-Phase to Minimize CIN All N-Channel External MOSFET Architecture No External Current Sense Resistor Precision Internal 0.8V ±1% Reference 550k Hz Switching Frequency Minimizes External ponent Size Very Fast Transient Response Up to 25A Output Current per Channel Low Shutdown Current: < 100µA Small 28-Pin SSOP Package Mobile Pentium® III Processor Systems Microprocessor Core and I/O Supplies Multiple Logic Supply Generator High Efficiency Power Conversion , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation. Pentium is a registered trademark of Intel Corporation. The LTC®1703 is a dual switching regulator controller optimized for high efficiency with low input voltages. It includes two plete, on-chip, independent switching regulator controllers. Each is designed to drive a pair of external N-channel MOSFET devices in a voltage mode feedback, synchronous buck configuration. The LTC1703 includes digital output voltage adjustment on side 1 that conforms to the Intel Mobile VID specification. It uses a constantfrequency, true PWM design switching at 550k Hz, minimizing external ponent size and cost and optimizing load transient performance. The synchronous buck architecture automatically shifts to discontinuous and then to Burst Mode TM operation as the output load decreases, ensuring maximum efficiency over a wide range of load currents. The LTC1703 Features an onboard reference trimmed to 1% and delivers better than 1.5% regulation at the converter outputs. An optional latching FAULT mode protects the load if the output rises...