Constant On-Time Buck Regulator with One External and One Internal Linear Regulator

A4406

These parts are no longer in production The device should not be purchased for new design applications. Samples are no longer available. The A4406 is an automotive power management IC featuring a high-frequency 5.45V pre-regulator, internal 5V and 3.3V linear regulators for CAN and microprocessor power. It includes comprehensive protection like undervoltage lockout, thermal shutdown, overcurrent protection, and power-on-reset with adjustable delay.

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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
50 V absolute maximum input voltage for surges
Valley current sensing achieves shortest buck on-times
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
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)