Integrated 4V-60V, 150mA, High-Efficiency, Synchronous Step-Down DC-DC Converter with 50mA Linear Regulator

The Himalaya series of voltage regulator ICs, power modules, and chargers enable cooler, smaller, and simpler power-supply solutions. MAX17670, MAX17671, and MAX17672 are dual-output regulators integrating a 4V to 60V, 150mA high-voltage, high-efficiency, Himalaya synchronous step-down converter with internal MOSFETs and a high-PSRR, low-noise, 2.35V to 5.5V, 50mA linear regulator. The MAX17670 and MAX17671 provide fixed step-down converter output voltages of 3.3V and 5V, respectively. The output voltage of the MAX17672 step-down converter is adjustable (0.8V up to 90% of VIN). 3.3V (MAX17671 and MAX17672 only), 3.0V, 2.5V, 1.8V, 1.5V, and 1.2V linear regulator output voltage options are supported.

The feedback-voltage regulation accuracy over -40°C to +125°C temperature range for the linear regulator is ±1.3% and for the step-down converter is ±2%. The devices are available in a compact 10-pin (3mm x 3mm) TDFN package. Simulation models are available.

Applications

* Battery-Powered Equipment * High-Voltage Linear Regulator Replacement * HVAC and Building Control * Industrial Sensors and Process Control

* 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 Step-Down Converter Output

* Reduces 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 5.5V 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 active-low RESET* Resistor 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