4.5V–60V, 3A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation

The MAX17574, 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 3A current. Output voltage is programmable from 0.9V up to 90%VIN. The feedback voltage regulation accuracy over -40°C to +125°C is ±0.9%.

The MAX17574 features a peak-current-mode control architecture. The device can be operated in the pulse-width modulation (PWM), pulse-frequency modulation (PFM) or discontinuous-conduction mode (DCM) control schemes. 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.

The MAX17574 is available in a 24-pin (4mm x 5mm) TQFN package. Simulation models are available.

Design Solution: Design 20W–30W Power Supplies with Over 90% Efficiency for 24V+ Industrial Automation Systems ›

Applications

* Base Station 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 for Any Output Voltage

* All-Ceramic Capacitors, Compact Layout

* Reduces Number of DC-DC Regulators to Stock

* Wide 4.5V to 60V Input

* Adjustable Output Voltage Range from 0.9V up to 90% of VIN

* Delivers up to 3A Current Over Temperature

* 100kHz to 2.2MHz Adjustable Switching Frequency with External Synchronization

* Reduces Power Dissipation

* Peak Efficiency > 90%

* PFM and DCM Modes Enable Enhanced Light-Load Efficiency

* Auxiliary Bootstrap LDO for Improved Efficiency

* 2.8μA Shutdown Current

* Operates Reliably in Adverse Industrial Environments

* Hiccup Mode Overload Protection

* 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