2.2 MHz Automotive Buck Pre-Regulator with Multiple LDOs, Watchdog, and SPI

A4407

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The A4407 integrates a 2.2 MHz buck pre-regulator, multiple LDO regulators, a configurable watchdog timer, and SPI control for flexible power management in automotive applications. Its wide input voltage range, fault protection, and diagnostic capabilities ensure robust performance in demanding environments.

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Top Features

Packaging

Typical Applications

  • 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
  • Constant on-time (COT) buck pre-regulator
  • Valley current sensing achieves shortest buck on-times
  • 2.2 MHz (VIN - adjusted) switching frequency
  • 5 V internal low-dropout tracking linear regulator with foldback short circuit and short-to-battery protections
  • 5 V internal low-dropout linear regulator with foldback short circuit protection
  • 3.3 V external FET controller/driver with programmable current limit and foldback short circuit protection
  • 1.2 V/1.5 V/1.8 V external FET controller/driver with programmable current limit and foldback protection
  • Power-on reset (NPOR) with adjustable rising delay
  • Logic enable input (ENB) for microprocessor control
  • Ignition enable input (ENBAT) for remote startup
  • Ignition status indicator (ENBATS) output
  • Buck pulse-by-pulse overcurrent protection
  • Buck LX short circuit protection (latched)
  • Missing asynchronous diode protection (latched)
  • UVLO for VIN, charge pump, and the internal rail
  • Thermal shutdown protection
  • −40ºC to 150ºC junction temperature range

The A4407 is supplied in a low profile (1.1 mm) 24-lead TSSOP package with exposed pad for enhanced thermal dissipation (suffix LP). The package is lead (Pb) free with 100% matte-tin leadframe plating.

LP Package Documentation

Automotive Control Modules, such as:

Part Number Specifications and Availability