Analog Devices MAX17543 Product Info

• Reduces External Components and Total Cost
  • No Schottky—Synchronous Operation
  • Internal Compensation for Any Output Voltage
  • Built-In Soft-Start
  • All-Ceramic Capacitors, Compact Layout
• Reduces Number of DC-DC Regulators to Stock
  • Wide 4.5V to 42V Input
  • Adjustable 0.9V to 0.9 x V_IN Output
  • 100kHz to 2.2MHz Adjustable Switching Frequency with External Synchronization
• Reduces Power Dissipation
  • Peak Efficiency >90%
  • PFM/DCM Enables Enhanced Light-Load Efficiency
  • 2.8µA Shutdown Current
• Operates Reliably in Adverse Industrial Environments
  • Peak Current-Limit Protection
  • 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 MAX17543 high-efficiency, high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs operates over a 4.5V to 42V input. The converter can deliver up to 2.5A and generates output voltages from 0.9V up to 0.9 x V_IN. The feedback (FB) voltage is accurate to within ±1.1% over -40°C to +125°C.

The MAX17543 uses peak current-mode control. The device can be operated in the pulse-width modulation (PWM), pulse-frequency modulation (PFM), or discontinuous conduction mode (DCM) control schemes.

The device is available in a 20-pin (4mm × 4mm) TQFN package. Simulation models are available.

Applications

• Base Station Power Supply
• Distributed Supply Regulation
• General-Purpose Point-of-Load
• High-Voltage Single-Board Systems
• Industrial Power Supplies