LTC1873 Datasheet | Linear Technology

LTC1873 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 Two Independent PWM Controllers in One Package Side 1 Output Is pliant with Intel Desktop VRM 8.4 Specifications (Includes 5-Bit VID DAC) 1.3V to 3.5V Output Voltage with 50m V/100m V Steps Two Sides Run Out-of-Phase to Minimize CIN All N-Channel External MOSFET Architecture No External Current Sense Resistors Required Precison 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 U APPLICATIO S s s s s Microprocessor Core and I/O Supplies Multiple Logic Supply Generator High Efficiency Power Conversion Chipset Power Supply The LTC®1873 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 MOSFETs in a voltage mode feedback, synchronous buck configuration. The LTC1873 includes digital output voltage adjustment on side 1 that conforms to the Intel Desktop VID specification. A constant-frequency, true PWM design minimizes external ponent size and cost and optimizes 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 LTC1873 Features an onboard reference trimmed to 1% and delivers better than 1.5% regulation at the converter outputs over all binations of line, load and temperature. Each channel can be enabled independently; with both channels disabled, the LTC1873 shuts down and supply current drops below 100µA. , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear...