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2.2 MHz Automotive Buck Pre-Regulator with Multiple LDOs, Watchdog, and SPI
A4407
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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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.