60V, 500mA, Ultra-Small, High-Efficiency, Synchronous Step-Down DC-DC Converter

The MAX17501 high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operates over a 4.5V to 60V input voltage range. This device is offered in a fixed 3.3V , 5V or adjustable output voltage (0.9V to 92%VIN) while delivering up to 500mA of current. The output voltage is accurate to within ±1.7% over -40°C to +125°C. The MAX17501 is available in a compact TDFN package. Simulation models are available.

The device features peak-current-mode control with pulse-width modulation (PWM). Users can choose devices with either pulse frequency modulation (PFM) or forced PWM scheme. PFM devices skip pulses at light load for higher efficiency, while forced-PWM devices operate with fixed switching frequency at any load for noise sensitive-applications. The low-resistance, on-chip MOSFETs ensure high efficiency at full load and simplify the layout.

A programmable soft-start feature allows users to reduce input inrush current. The device also incorporates an output enable/undervoltage lockout pin (EN/UVLO) that allows the user to turn on the part at the desired input-voltage level. An open-drain active-low RESET pin provides a delayed power-good signal to the system upon achieving successful regulation of the output voltage.

Applications

* Base Station, VOIP, Telecom * Battery-Powered Equipment * General-Purpose Point-of-Load * Home Theater * HVAC and Building Control * Industrial Process Control

* Eliminates External Components and Reduce Total Cost

* No Schottky-Synchronous Operation for High Efficiency and Reduced Cost

* Internal Compensation and Feedback Divider for 3.3V and 5V Fixed Outputs

* All-Ceramic Capacitors, Ultra-Compact Layout

* Reduces Number of DC-DC Regulators to Stock

* Wide 4.5V to 60V Input Voltage Range

* 0.9V to 92%VIN Adjustable Output Voltage

* Delivers up to 500mA

* 600kHz and 300kHz Switching Frequency Options

* Available in a 10-Pin, 3mm x 2mm TDFN Package

* Reduces Power Dissipation

* Peak Efficiency > 90%

* PFM Feature for High Light-Load Efficiency

* Shutdown Current = 0.9µA (typ)

* Operates Reliably in Adverse Industrial Environments

* Hiccup-Mode Current Limit, Sink Current Limit, and Autoretry Startup

* Built-In Output-Voltage Monitoring (Open-Drain Active-Low RESET Pin)

* Resistor-Programmable EN/UVLO Threshold

* Adjustable Soft-Start and Prebiased Power-Up

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