4.5V to 76V, 1A, High-Efficiency, Synchronous Step-Down DC-DC Converter

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%.

The device features a peak-current-mode control architecture and can be operated in either the pulse-width modulation (PWM) or pulse-frequency modulation (PFM) control schemes.

The MAX17761 is available in a 12-pin (3mm x 3mm) TDFN package. Simulation models are available.

Applications

* Basestation Power Supplies * Distributed Supply Regulation * General-Purpose Point-of-Load * High-Voltage, Single-Board Systems * Industrial Control Power Supplies * Wall Transformer Regulation

* 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 Active-low 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