Renesas Electronics RAA271082 PMIC for cars

Renesas Electronics RAA271082 Automotive PMIC is an adaptive multi-track power supply IC consisting of one primary side high voltage synchronous step-down regulator, two secondary side low voltage synchronous step-down regulators and one LDO regulator. The RAA271082 features four overvoltage and undervoltage monitors, I2C communications, a universal I/O pin, and a dedicated reset output/failure indicator.

The Renesas RAA271082 Automotive class PMIC demonstrates the ASIL-D ISO-26262 development process, designed to meet the ASIL-B device specifications. The RAA271082 includes a second bandgap reference voltage source for the OV/UV monitor, built-in self-check at power-on, independent OV/UV monitoring, and continuous CRC error checking on internal registers and I2C communications.

The device provides a high-density power solution with few external components and minimal board space. PMIC has various features and is configured using internal disposable programmable (OTP) memory. Almost all device options (such as each output voltage selection, power ordering, and OV/UV threshold) are configured internally and can be selected without external components. The regulator also provides internal compensation. The step-down regulator performs synchronously with high efficiency and can operate in harsh environments requiring high ambient temperatures.

The RAA271082 comes in a 4mm × 4mm 24 lead-in cut QFN (SCQFN) package with an exposed pad for improved heat dissipation. The device complies with AEC-Q100 standard Class 1, with ambient temperatures ranging from -40°C to 125°C and electrical junction temperature ratings ranging from -40°C to 150°C.

Features

● ASIL-D ISO26262 Development process
● VIN operating voltage range: 4.0V to 42V, starting voltage range: 4.5V to 42V
● Fixed switching frequency: 2.2MHz, optional pseudo-random spread spectrum
● Three synchronous step-down regulators (with internal compensation) and one LDO

- Buck1 output range: 2.8V to 5.05V, up to 1A
- Buck2/3 output range: 0.85V to 3.3V, up to 1A
- LDO4 output range: 2.7V to 3.4V, up to 300mA

● OTP UV/OV thresholds: ±4%, ±6%, ±8% and ±12%
● OTP power-on/power-off sequence and delay
● Optional output discharges on step-down converter 2, step-down converter 3, and LDO4. ● Optional output discharges on step-down converter 2, step-down Converter 3, and ldo4
● GPIO pins can be configured
● Double EN pins
● Comply with AEC-Q100 Level 1, temperature range: -40°C to +125°C (TJ = 150°C)
● Protection

-   Input voltage UVLO
-   Output OV/UV
-   Overcurrent protection on internal and output Ldos
-   Superheat shut-off

● Functional safety

- Built-in self-check on power-on (BIST)
- Double band gap/reference chain
- Independent UV/OV detection path for Buck1 output
- Configurable Window Watchdog Timer (WWDT)
- Continuous CRC check of the OTP shadow register
- CRC protects I2C communication
- The fault manager can be configured

Applications

● Driver surveillance camera
● Car rear-view and round-view HD cameras
● Microcontroller PMIC for battery management systems
● Microcontroller PMIC for area and domain controllers
● Microcontroller PMIC for gateway unit