The A4407 is a carPower management ICsIt powers a 5 V linear regulator, a 5 V track/protection linear regulator, a 3.3 V linear field effect transistor (FET) controller/driver, and a 1.2 V/1.5 V/1.8 V linear field effect transistor (FET) controller/driver using a 2.2 MHz constant on-time (COT) buck preregulator. The A4407 has a pin that sets the main reference of the 5 V tracking regulator to a 3.3 V or 5 V output. The buck on-time is internally adjusted by VIN's function to maintain a 2.2 MHz switching frequency. Efficient operation can be achieved by using a buck preregulator to reduce the input voltage before powering the linear regulator. Designed to power CAN and microprocessor power in high-temperature environments, the A4407 is ideal for under-the-hood applications.
The switching regulator is designed to operate at a nominal switching frequency of 2.2 MHz. The high switching frequency enables customers to select low-value inductors and ceramic capacitors while avoiding electromagnetic interference (EMI) in the AM band. Protection features include undervoltage lockout, pulse-by-pulse current limit, LX short-circuit protection, and thermal shutdown. In the event of a load short circuit, all linear regulators initiate foldback overcurrent protection. In addition, the V5P output is protected from short battery circuits. The A4407 has a logic level and high voltage (current limit, limit) allowed inputs. The A4407 also features a power-on reset (NPOR) output with adjustable delay for microprocessor control.
The A4407 is available in a small (1.1 mm) 24-pin TSSOP package with an exposed heatsink mounted for enhanced thermal functionality (suffix LP). The package is lead (Pb) free and features 100% matte tin leadframe plating.
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Automotive control modules such as:
- Electronic Power Steering (EPS)
- Transmission Control (TCU)
- Anti-Lock Braking System (ABS)
- Emission control
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- AEC Q100 Class 0 compliant
- A built-in buck preregulator followed by a low dropout (LDO) output
- 5.5 to 36 V VIN operating range (max. 50 V); For start/stop, cold start, and load dump requirements
- Constant on-time (COT) buck preregulator
- Valley current sensing achieves the shortest buck on-time
- 2.2 MHz（VIN - adjusted) switching frequency
- 5 V built-in low-dropout tracking linear regulator with foldback short-circuit and short-to-battery protection
- 5 V built-in low dropout linear regulator with foldback short-circuit protection
- 3.3 V external field-effect transistor (FET) controller/driver with programmable current limit and foldback short-circuit protection
- 1.2 V/1.5 V/1.8 V external field-effect transistor (FET) controller/driver with programmable current limit and foldback protection
- Power-on reset (NPOR) with adjustable rise delay
- Logic Allow Input for Microprocessor Control (ENB)
- Ignition start input for remote start (ENBAT)
- Ignition status indicator (ENBATS) output
- Buck-pulse-by-pulse overcurrent protection
- Buck LX short-circuit protection (lockout)
- Lack of asynchronous diode protection (locking)
- VIN, charge pump, and undervoltage lockout (UVLO) on the inner rail
- Thermal shutdown protection
- −40ºC to 150ºC junction temperature range