60V, 1A, Dual-Output, High-Efficiency, Synchronous Step-Down DC-DC Converter

The MAX17521 dual-output, high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operates over a 4.5V to 60V input. The converter can deliver up to 1A at each output. Each output is programmable from 0.9V to 92%VIN. The feedback voltage regulation accuracy over -40°C to +125°C is ±1.7%.

The MAX17521 uses peak-current-mode control. Each output can be operated in the pulse-width modulation (PWM) or pulse-frequency modulation (PFM) control schemes.

The MAX17521 is available in a 24-pin (4mm x 5mm) TQFN package. Simulation models are available.

Applications

* CPU, DSP, or FPGA Power * Distributed Supply Regulation * General-Purpose Point of Load * Industrial Control Power Supplies

* Reduces External Components and Total Cost

* No Schottky—Synchronous Operation

* All-Ceramic Capacitors, Compact Layout

* Reduces Number of DC-DC Regulators to Stock

* Wide 4.5V to 60V Input

* Each Output Adjustable From 0.9V to 92%VIN

* Pin-Selectable 560kHz or 300kHz Switching Frequency

* Independent Input Voltage Pin for Each Output

* Reduces Power Dissipation

* Peak Efficiency > 90%

* PFM Mode Enables Enhanced Light-Load Efficiency

* 1μA Shutdown Current

* Operates Reliably in Adverse Industrial Environments

* Hiccup Mode Overload Protection

* Adjustable Soft-Start Pin for Each Output

* Built-In Output Voltage Monitoring with Active-Low RESET for Each Output

* Adjustable EN/UVLO Threshold for Each Output

* 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