Analog Devices MAX17574 Product Info

• 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 V_IN
  • 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

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%V_IN. 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