TPS54540-Q1

• Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results:
  • Device Temperature Grade 1: –40°C to 125°C
    Ambient Operating Temperature Range
  • Device HBM ESD Classification Level H1C
  • Device CDM ESD Classification Level C3B
• High-Efficiency at Light Loads With Pulse-
  Skipping Eco-mode™
• 92-mΩ High-Side MOSFET
• 146-µA Operating Quiescent Current and 2-µA
  Shutdown Current
• 100-kHz to 2.5-MHz Adjustable Switching
  Frequency
• Synchronizes to External Clock
• Low Dropout at Light Loads With Integrated
  BOOT Recharge FET
• Adjustable UVLO Voltage and Hysteresis
• 0.8-V 1% Internal Voltage Reference
• 8-Pin HSOP PowerPAD™ Package
• –40°C to 150°C T_J Operating Range
• Supported by WEBENCH^® Software Tool

The TPS54540-Q1 device is a 42-V, 5-A, step-down regulator with an integrated high-side MOSFET. The device survives load-dump pulses up to 65 V per ISO 7637. Current mode control provides simple external compensation and flexible component selection. A low-ripple pulse-skip mode reduces the no load supply current to 146 µA. Shutdown supply current is reduced to 2 µA when the enable pin is pulled low.

Undervoltage lockout is internally set at 4.3 V but can be increased using an external resistor divider at the enable pin. The output voltage start-up ramp is internally controlled to provide a controlled start-up and eliminate overshoot.

A wide adjustable frequency range allows either efficiency or external component size to be optimized. Output current is limited cycle-by-cycle. Frequency foldback and thermal shutdown protect internal and external components during an overload condition.

The TPS54540-Q1 is available in an 8-pin thermally-enhanced HSOP PowerPAD package.