DESCRIPTION

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.

FEATURES

 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

 Frequency Synchronization

 Clock Output for 4- or 8-Phase Operation

 Spread Spectrum Frequency Modulation (SSFM) for

EMI Reduction

 Available in a 3mm × 4mm 20-Lead Side Solderable

QFN Package

 AEC-Q100 Qualified for Automotive Applications

APPLICATIONS

 Automotive, Telecom, and Industrial Power Supplies