A81407: Fully Integrated PMIC for Safety-Related Systems with Buck or Buck-Boost Pre-Regulator, 4× Linear Regulators, 4× Gate Drivers, and SPI

Description

The A81407 is a power management IC that integrates a buck or buck/boost pre-regulator, four LDOs, and four floating gate drivers. The pre-regulator uses a buck or buck/boost topology to efficiently convert automotive battery voltages into a tightly regulated intermediate voltage complete with control, diagnostics, and protections.

The output of the pre-regulator supplies a 3.3 V / 375 mA linear regulator, a 5 V / 150 mA linear regulator, and two 5 V / 120 mA linear regulators that are protected from high voltage. Designed to supply power for microprocessors, sensors, and CAN transceivers, the A81407 is ideal for under-hood applications.

The independent floating gate drivers have the capability of controlling N-channel MOSFETs through SPI. These MOSFETs can be configured as 3× phase and 1× battery isolation device in high current motor applications. An integrated charge pump allows the driver outputs to maintain the power MOSFETs in the on state over the full supply range with high phase-voltage slew rates.

Enable inputs to the A81407 include a logic level (ENB) and a high voltage (ENBAT). The A81407 has the capability to disable individual output rails through its serial peripheral interface (SPI).

Diagnostic outputs from the A81407 include a Watchdog Fault (WD_Fn), power-on reset (NPOR), and a fault flag (FFn) to alert the microprocessor that a fault has occurred. The microprocessor can read fault registers through SPI and operational status via an analog multiplexor. Dual bandgaps, one for regulation and one for fault checking, improve safety coverage and fault detection of the A81407.

The A81407 contains three types of watchdog timers: Pulse Width Watchdog (PWWD), Window Watchdog (WWD), and Q & A Watchdog (QAWD). The watchdog timers can be put into various operating states via secure SPI commands.

The A81407 is supplied in a 38-lead eTSSOP package (suffix “LV”) with exposed power pad.

Top Features

  • A2-SIL™ pending—device features for safety-critical systems
  • Automotive AEC-Q100 qualified
  • Wide input voltage range, 3.8 to 36 VIN operating range,40 VIN maximum
  • 2.2 MHz buck or buck/boost pre-regulator (VREG: 5.35 V)
  • Four internal linear regulators with foldback short-circuit protection
    • VUC: selectable output (3.3 V / 5.0 V) regulator for microcontroller
    • V5A: 5 V general purpose LDO regulator
    • V5P1 and V5P2: two LDO regulators with short-to-battery protection for remote sensors
  • Pulse Width Watchdog (PWWD), Window Watchdog (WWD), and Q&A Watchdog (QAWD)

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check Stock
APEK81407KLV-01-MH DEMO BOARD -20°C to 85°C No -- New Contact your
local sales rep
Check
Distributor Stock
APEK81407KLV-01-MH-1 DEMO BOARD -20°C to 85°C No -- New Contact your
local sales rep
Check
Distributor Stock
A81407KLVATR 38-lead TSSOP -40°C to 150°C Yes View Data New Contact your
local sales rep
Check
Distributor Stock
A81407KLVATR-1 38-lead TSSOP -40°C to 150°C Yes View Data New Contact your
local sales rep
Check
Distributor 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.

Allegro LV Package Image

Packaging

38-Pin eTSSOP (suffix LV)