Conv DC-DC Single Step Down 4.5V to 42V 20-Pin TQFN EP T/R

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 VIN. 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 x 4mm) TQFN package. Simulation models are available.

• 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 Frequencywith External Synchronization

Reduces Power Dissipation

• Peak Efficiency >90%
• PFM/DCM Enables Enhanced Light-LoadEfficiency
• 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
• -40°C to +125°C Operation