The LT8277 is a 2-phase constant frequency, current mode boost and SEPIC controller that drives N-channel power MOSFETs. The 2-phase interleaved operation reduces system filtering capacitance requirements. An internal LDO regulator draws power from VIN or VOUT to provide a 5V supply for the gate drivers. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages. The operating frequency of the LT8277 can be set over a 100kHz to 2MHz range with an external resistor or can be synchronized to an external clock using the SYNC pin. The CLKOUT and SYNC pins allow multiple LT8277 devices to work together, enabling 4- or 8-phase operation. The LT8277 output voltage ranges from 9V to 60V, which can be set through the SPI interface. A window comparator on the VOUT pin reports via the PGOOD pin, providing an output voltage status indication. The device is available in a 20-Lead 3mm × 4mm side-solderable QFN package. Applications * Automotive, Telecom, and Industrial Power Supplies * Wide Input Voltage Range: 3V to 40V * 2-Phase Interleaved Operation Reduces Input and Output Capacitance Requirements * SPI Interface for Output Voltage Adjustment * Low Shutdown Current < 1μA * Internal 5V Low Dropout Voltage Regulator Supplied from VIN or VOUT * PGOOD Output Status Reporting Pin * Programmable Internal Frequency: 100kHz to 2MHz