Analog Devices / Maxim Integrated MAX1767x 4V-60V Step-Down DC-DC Converters

Analog Devices MAX1767x DC-DC Converters have dual-output regulators and integrate a 4V to 60V high-efficiency synchronous step-down converter. The MAX1767x combines the converter with internal MOSFETs and a high-PSRR, low-noise, 2.35V to 5V, 50mA linear regulator, making it ideal for high-voltage linear regulator replacement. Fixed step-down converter output voltages of 3.3V and 5V are provided in the order given by the Analog Devices MAX17670 and MAX17671, with the MAX17672 being adjustable.

A feedback-voltage regulation accuracy for the linear regulator is ±1.3% and for the step-down converter is ±2% at a temperature range of -40°C to +125°C. The device reduces external components and costs with internal compensation, built-in soft start, and protection against inductive short at the step-down converter output.

Features

Reduces external components and total cost
- No Schottky-synchronous operation
- Internal compensation
- Built-in soft-start
- All-ceramic capacitors, compact layout
- Protection against inductive short at the step-down converter output
Reduces the number of DC-DC regulators to stock
- Wide 4V to 60V input range for the step-down converter regulator
- Up to 98% duty-cycle step-down operation
- 200kHz to 2.2MHz adjustable switching frequency with external synchronization for step-down converter
- 2.35V to 5V input range for the linear regulator
- Linear regulator with up to 50mA load current capability

Reduces power dissipation
- 50μA no-load supply current
- PFM enables enhanced light-load efficiency
- 2.5μA shutdown current
- Bootstrap bias input for improved efficiency
Reliable operation in adverse environments
- Peak current-limit protection
- Built-in output-voltage monitoring with RESET
- Resistor programmable EN/UVLO threshold
- Monotonic startup into pre-biased load
- Overtemperature protection
- High industrial -40°C to +125°C ambient operating temperature range/-40°C to +150°C junction temperature range