Analog Devices LT8277

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

Typical applications

More information

• Datasheet
• IC product information