Constant On-Time Buck Regulator with Integrated 5V Regulators and 3.3V DMOS Driver

A4405

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The A4405 simplifies power management in automotive applications by integrating a 2.2 MHz buck pre-regulator, two 5V linear regulators, and a 3.3V DMOS driver. This highly integrated solution offers a wide input voltage range, short-to-battery protection, and robust fault protection for reliable performance in underhood environments.

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Top Features

Packaging

  • AEC-Q100 Grade 0 qualified
  • Internal buck pre-regulator followed by LDO outputs
  • 5.5 to 36 V VIN operating range (50 V maximum); for start/stop, cold crank, and load dump requirements
  • 2.2 MHz constant on-time buck regulator
  • Valley current sensing achieves shortest buck on-times
  • 50 V absolute maximum input voltage for surges
  • 5.5 to 46 V input voltage range
  • 40ºC to 150ºC junction temperature range
  • Power-on reset (NPOR pin) with adjustable rising delay
  • 5 V (V5P pin) internal low dropout tracking linear regulator with both overcurrent foldback and short-to-battery protection
  • 5 V (V5 pin) internal low dropout linear regulator with overcurrent foldback protection
  • 3.3 V (V33 pin) external linear regulator DMOS driver with a programmable current limit (up to 500 mA) and overcurrent foldback protection
  • Logic enable input (ENB pin)
  • Ignition enable input (ENBAT pin)
  • Ignition status indicator (ENBATS pin)
  • Buck pulse-by-pulse overcurrent protection
  • Buck LX short circuit protection (latched)
  • Missing asynchronous diode protection (latched)
  • Switcher (VREG pin), 3.3 V (V33 pin), and charge pump
  • (VCP pin) undervoltage lockout protection (UVLO)
  • Thermal shutdown protection (TSD)

The A4405 is supplied in a low profile (1.2 mm max) 20-pin TSSOP package with exposed thermal pad (suffix LP). The package is lead (Pb) free with 100% matte-tin leadframe plating.

LP Package Documentation

Part Number Specifications and Availability