General Description

The MAX17761, high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operates over a 4.5V to 76V input. The converter can deliver up to 1A current. Output voltage is programmable from 0.8V up to 90 of VIN. The feedback voltage regulation accuracy over -40°C to +125°C is ±1.5.

Benefits and Features

● Reduces External Components and Total Cost

    • No Schottky—Synchronous Operation

    • Internal Compensation Components

    • All-Ceramic Capacitors, Compact Layout

● Reduces Number of DC-DC Regulators to Stock

    • Wide 4.5V to 76V Input

    • Output Adjustable from 0.8V up to 90 of VIN

    • Delivers up to 1A Over Temperature

    • 200kHz to 600kHz Adjustable Frequency with External Clock Synchronization

    • Programmable Current Limit

● Reduces Power Dissipation

    • Peak Efficiency > 90

    • PFM Mode Enables Enhanced Light-Load Efficiency

    • Auxiliary Bootstrap LDO for Improved Efficiency

    • 5μA Shutdown Current

● Operates Reliably in Adverse Industrial Environments

    • Adjustable Soft-Start and Prebiased Power-Up

    • Built-in Output-Voltage Monitoring with RESET

    • Programmable EN/UVLO Threshold

    • Monotonic Startup into Prebiased Load

    • Overtemperature Protection

    • High Industrial -40°C to +125°C Ambient Operating Temperature Range/-40°C to +150°C Junction Temperature Range

Applications

● Industrial Control Power Supplies

● General-Purpose Point-of-Load

● Distributed Supply Regulation

● Basestation Power Supplies

● Wall Transformer Regulation

● High-Voltage, Single-Board Systems