Datasheet > RAA271041

RAA271041

更新时间： 2024-12-01 14:57:43

品牌	Logo	应用领域
瑞萨 - RENESAS		/
页数	文件大小	规格书
10页	370K
描述
Cold Crank Boost and Buck Controller with Drivers for ASIL-D Automotive Applications

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RAA271041 数据手册

Short-Form Datasheet

RAA271041

Cold Crank Boost and Buck Controller with Drivers for ASIL-D Automotive Applications

The RAA271041 is a controller for a dual regulator

system capable of supporting ASIL-D automotive

systems that must operate during battery dropout

Features

▪ ASIL-D Functional Safety

▪ 40V Boost and Buck integrated driver controller

▪ FET drivers support source/sink current of 2A/3A

conditions. The Channel 2 Boost regulator maintains

the voltage rail supplying the downstream Channel 1

Buck regulator, allowing the Buck output to maintain

regulation during a battery dropout event such as cold

cranking.

▪ Low I with ECM mode of 6µA typical

▪ Separate Wake (Enable) inputs for each channel

▪ Minimized FET ON and OFF times (20ns

For cold crank applications, the Channel 2 Boost has

and 50ns)

an adjustable output and is active when the V

BAT

▪ Optional pseudo-random spread spectrum clocking

▪ Buck frequency options 400kHz or 2.2MHz

input voltage falls below a user-programmable

threshold. If the V input is above the

BAT

user-programmed threshold, the Boost controller

offers a Boost Bypass mode in which the high-side

MOSFET of the Boost channel is held on and the

▪ Boost frequency options 400kHz or 2.2MHz

(2.2MHz requires Buck frequency at 2.2MHz)

▪ VBATS sense for boost enable during cold crank

▪ Boost Bypass mode (with buck in CCM)

▪ External synchronization via SYNC pin

▪ Dual over-temperature protection monitors

▪ 6x6mm 36Ld SC-QFN package

input voltage is passed directly to the Boost

BAT

output. The Boost channel can also be configured as

a standalone Boost, which is always on.

The Boost output from Channel 2 supplies the input

for Channel 1 buck. The Buck can be configured

either as fixed 5V or fixed 3.3V output or as an

adjustable output from 0.8V to 12V using a resistor

divider from VOUT1 to FB1 to ground.

▪ AEC-Q100 grade 1 qualified

Functional Safety Features

▪ Built-In Self Test (BIST) at power up

The RAA271041 requires a minimum input voltage of

6V for start-up. The Channel 2 Boost has an input

range from 2.2V to 42V, while the Channel 1 Buck has

an input range from 3.5V to 42V.

▪ Recurring checks: internal references, PWM clock,

system clock, PGND/AGND connection, dual

over-temperature monitor, ECM exit delay, VCC

supply.

The RAA271041 Buck channel can operate in Energy

▪ Independent references and feedback sense paths

Conservation Mode (ECM) to provide a low I mode by

for Buck and Boost OV/UV detection

reducing quiescent current draw to 6µA (typical) when

no external load is applied. The Buck and Boost

switching frequencies are factory programmed to

400kHz or 2.2MHz. Optional spread spectrum

operation allows for a reduction of EMI and noise

levels.

▪ Independent fault indicators for Buck and Boost

▪ Fail-safe output, logic high indicates a trusted

device state with all safety monitors active.

Applications

• Automotive battery supplied applications

• In cabin systems

• ADAS: Advanced Driver Assist Systems

• Start-stop protected systems (such as head unit,

cluster, e-Mirror)

R33DO0006EU0100 Rev.1.00

Sep 28, 2021

Page 1

12 3 4 5 6 7...10

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