A4412: Buck or Buck/Boost Pre-Regulator with a Synchronous Buck, 5 Internal Linear Regulators, Pulse-Width Watchdog Timer, and SPI

The A4412 is a power management IC that uses a buck or buck/boost pre-regulator to efficiently convert automotive battery voltages into a tightly regulated intermediate voltage complete with control, diagnostics and protections. The output of the preregulator supplies a 5 V / 100 mA protected linear regulator, a 3.3 V / 90 mA linear regulator, a 5 V / 200 mA linear regulator, a 5 V / 55 mA linear regulator, a 5 V / 30 mA linear regulator and an adjustable 400 mA synchronous buck regulator. Designed to supply CAN transceiver, sensor, and microprocessor power supplies in high-temperature environments, the A4412 is ideal for under-hood applications.

Enable inputs to the A4412 include a logic level (ENB) and a high-voltage (ENBAT). The A4412 also provides flexibility with disable function of the individual 5 V rails through a serial  peripheral interface (SPI).

Diagnostic outputs from the A4412 include a power-on-reset output (NPOR), an ENBAT status output, and a fault flag output to alert the microprocessor that a fault has occurred. The microprocessor can read fault status through SPI. Dual bandgaps, one for regulation and one for fault checking, improve safety coverage and fault detection of the A4412.

The A4412 contains a Window Watchdog timer with a detect period of 2 ms. The watchdog timer is activated once it receives valid 2 ms pulses from the processor. The watchdog can be put into flash mode or be reset via secure SPI commands.

Protection features include undervoltage and overvoltage on all output rails. In case of a shorted output, all linear regulators feature foldback overcurrent protection. In addition, the V5P output is protected from a short-to-battery event. Both switching regulators include pulse-by-pulse current limit, hiccup mode short-circuit protection, LX short-circuit protection, missing asynchronous diode protection (VREG only) and thermal shutdown.

The A4412 is supplied in a low-profile (1.2 mm maximum height) 38-lead eTSSOP package (suffix “LV”) with exposed power pad.

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Astrorep Inc. (Allegro and Sanken Semiconductors, Sanken Power Supplies)
141 John Street, Suite 300
Babylon, NY 11702
Phone: (631)422-2500
Fax: (631)422-2504
Web: www.astrorepinc.com
Email: donna.tweedy@astrorepinc.com

If this is not your local representative, find your local sales rep here.

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  • A2-SIL™ product—device features for safety critical systems
  • Automotive AEC-Q100 qualified
  • Wide input voltage range, 3.8 to 40 VIN operating range, 50 VIN maximum
  • Buck or buck/boost pre-regulator (VREG)
  • Adjustable 1.3 to 3.3 V, 400 mA synchronous buck.
  • Four internal linear regulators with foldback short-circuit protection, 3.3 V (3V3) and three 5 V (V5CAN, V5A, and V5B)
  • One internal 5 V linear regulator (V5P) with foldback short-circuit and short-to-battery protection
  • Power-on reset signal indicating a fault on the synchronous buck, 3V3 or V5A regulator outputs (NPOR)
  • Window watchdog timer with fail-safe features
  • Dual bandgaps for increased safety coverage and fault detection, BGVREF, BGFAULT
  • Control and diagnostic reporting through a serial peripheral interface (SPI)
  • Logic enable input (ENB) for microprocessor control
  • Ignition enable input (ENBAT) with status indicator output
  • Frequency dithering and controlled slew rate helps reduce EMI/EMC
  • OV and UV protection for all output rails
  • Pin-to-pin and pin-to-ground tolerant at every pin
A4412 Packages

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A4412 Product Image A4412 Block Diagram

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A4412KLVTR-T 38-lead TSSOP -40°C to 125°C Yes View Data Contact your
local sales rep
Check Stock
APEK4412KLV-01-MH DEMO BOARD -40°C to 125°C No -- Contact your
local sales rep
Check Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

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