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

A4405

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.

View Datasheet

Product Details

Top Features

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)