The LTC1873 is a dual switching regulator controller optimized for high efficiency with low input voltages. It includes two complete, 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 component size and cost and optimizes load transient performance. The synchronous buck architecture automatically shifts to discontinuous and then to Burst Mode™ 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 combinations 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. Applications * Microprocessor Core and I/O Supplies * Multiple Logic Supply Generator * High Efficiency Power Conversion * Chipset Power Supply * Two Independent PWM Controllers in One Package * Side 1 Output Is Compliant with Intel Desktop VRM 8.4 Specifications (Includes 5-Bit VID DAC) * 1.3V to 3.5V Output Voltage with 50mV/100mV 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 * 550kHz Switching Frequency Minimizes External Component Size * Very Fast Transient Response * Up to 25A Output Current per Channel * Low Shutdown Current: < 100µA * Small 28-Pin SSOP Package https://elecena.pl/product/253571/dual-550khz-synchronous-2-phase-switching-regulator-controller-with-5-bit-vid 2007-03-03 https://elecena.pl/product/253571/dual-550khz-synchronous-2-phase-switching-regulator-controller-with-5-bit-vid 2016-04-27 https://elecena.pl/product/253571/dual-550khz-synchronous-2-phase-switching-regulator-controller-with-5-bit-vid 2025-01-18