FEATURES AND BENEFITS

• Automotive AEC-Q100 qualified

• A2-SIL™ product—device features for safety-critical systems

• 6 to 36 VIN operating range, 40 VIN maximum

• 2.2 MHz synchronous buck pre-regulator (VREG)

• Adjustable synchronous buck regulator

(1.275 V or 1.25 V typ)

• 3.3 V (3V3) and 5 V (V5) internal LDO regulators with

foldback short-circuit protection

• 5 V (V5P1 and V5P2) internal tracking LDO regulator

with foldback short-circuit and short-to-battery protections

• Power-on reset (NPOR) with fixed delay of 15 ms

• Selectable watchdog (single-ended or window timer)

• Active-low watchdog timer enable input (WDENn)

• Dual band gaps for increased reliability: BGVREF, BGFAULT

• Fixed POK5V undervoltage threshold for V5

• Three 2-wire speed (rotational) sensor IOs

• Seven logic level shifter I/F

• Logic enable input (ENB) for microprocessor control

• Ignition enable inputs (ENBAT and VIGN-IN)

• Control and Diagnostic reporting through a serial

peripheral interface (SPI)

• Frequency dithering (SSCG) helps reduce EMI/EMC

• Overvoltage and undervoltage protection for all supply rails

• Thermal shutdown protection

• −40°C to 165°C junction temperature range

APPLICATIONS

• Transmission Control Units (TCU)

• Advanced Braking Systems (ABS)

• Electronic Power Steering (EPS)

DESCRIPTION

The ARG81403 is power management IC that uses a 2.2 MHz

synchronous buck pre-regulator 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 two 5 V / 100 mA tracking/

protected LDOs, a 3.3 V / 150 mA LDO, a 5 V / 300 mA LDO,

and an adjustable output synchronous buck regulator (1.275 V

or 1.25 VTYP / 1600 mA). Designed to supply power for

microprocessors, sensors, and CAN transceivers, the ARG81403

is ideal for underhood applications.

Enable inputs to the ARG81403 include a logic-level (ENB)

input and high-voltage (ENBAT and VIGN-IN) inputs.

Diagnostic outputs from the ARG81403 include a power-onreset output (NPOR) and a fault flag output (FFn) to alert the

microprocessor that a fault has occurred. The microprocessor

can read fault status through a serial peripheral interface (SPI).

Dual band gaps, one for regulation and one for fault checking,

improve safety coverage and fault detection of the ARG81403.

The ARG81403 implements three channels of 2-wire speed

(rotational) sensor IOs with dedicated VIN terminal and seven

channels of level shifter interfaces. The ARG81403 contains

a selectable watchdog (single-ended timer and window timer)

that can be programmed to accept a wide range of clock

frequencies. The watchdog timer has a fixed activation delay

to accommodate processor startup. The watchdog function has

an enable/disable pin (active low, WDENn) to facilitate initial

factory programming or field reflash programming.

Protection features include under- and overvoltage detection

on all five supply rails. In case of a shorted output, all linear

regulators feature foldback overcurrent protection. In addition,

the V5Px output is protected from a short-to-battery event. Both

switching regulators include pulse-by-pulse current limit, hiccup

mode short-circuit protection and LX short-circuit protection.

The ARG81403 is supplied in a 64-lead low-profile quad flat

package (suffix “JB”) with exposed thermal pad.