Datasheet > A81407KLVATR-1

A81407KLVATR-1

更新时间： 2024-11-26 02:51:59

品牌	Logo	应用领域
急速微 - ALLEGRO		/
页数	文件大小	规格书
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描述
Multi-Output Regulator with Buck or Buck-Boost Pre-Regulator

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A81407KLVATR-1 数据手册

A81407

Multi-Output Regulator with Buck or Buck-Boost Pre-Regulator,

4× LDO Outputs, Watchdog, 4× Gate Drivers, and SPI

DESCRIPTION

FEATURES AND BENEFITS

• A²-SIL™ pending—device features for safety-critical

systems

The A81407 is ideal for both automotive and industrial

applications, where high temperature operation, a high level

of integration, and robust solutions are required.

• Automotive AEC-Q100 qualified

• Wide input voltage range, 3.8 to 36 V_INoperating range,

40 V_INmaximum

• 2.2 MHz buck or buck/boost pre-regulator (VREG: 5.35 V)

with low EMI frequency dithering

• Frequency dithering and controlled slew rate help reduce

EMI/EMC

• Four internal linear regulators with foldback short-circuit

protection

The IC 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 input voltages into a

tightly regulated intermediate voltage. Frequency dithering and

slew control help reduce EMI. The output of the pre-regulator

supplies a 3.3 V / 375 mA linear regulator, a 5 V / 150 mA linear

regulator,andtwo5V/120mAlinearregulators.Alloftheoutputs

are protected against short circuits, and two are further protected

from short-to-supply voltage in case they are used remotely.

□ VUC: selectable output (3.3 V / 5.0 V) regulator for

microcontroller

The independent floating gate drivers can be used for input

supply disconnect or reverse-supply protection. They can

also be used for switched loads such as motor phases, solid

state relays, and solenoid valves. They have the capability of

controlling N-channel MOSFETs through SPI. 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.

□ V5A: 5 V general purpose LDO regulator

□ V5P1 and V5P2: two LDO regulators with short-to-

battery protection for remote sensors

• OV and UV protection for all output rails provides ability

to monitor health of outputs

• Pulse Width Watchdog (PWWD), Window Watchdog

(WWD), and Q&A Watchdog (QAWD)

• Floating gate drivers (with charge pumps) for external

switched load control

• Analog multiplexor (AMUX) reports operational values

of multiple important parameters

• Safety signal (POE) can disable a separate function (e.g.,

motor driver) due to a Watchdog Failure

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.

Continued on next page...

APPLICATIONS

PACKAGE

38-Pin eTSSOP (suffix LV)

Provides system power (for microcontroller/DSP, CAN,

sensors, etc.) and high-side gate driver control (for motor

phases and other switched loads such as solenoid valves and

SS relays) in:

• Industrial applications

• Electronic power steering (EPS)

Not to scale

• Advanced braking systems (ABS)

• Transmission control units (TCU)

• Emissions control modules

(pending)

• Other automotive applications

5.35 V

(VREG)

Buck-Boost

Pre-regulator

3.3 V / 5 V

5 V LDO (V5P1)

with Foldback &

Short to V_BAT

Protection

5 LDO (V5P2)

with Foldback &

Short to V_BAT

Protection

5 V LDO (V5A)

with Foldback

Protection

LDO (VUC)

with Foldback

Protection

4ch

Floating

Gate

NPOR,

Pulse-Width,

Window, and

Q&A

Drivers

Thermal

Shutdown

(TSD)

Analog MUX

Output for

Status Monitor

Serial

Interface

(SPI)

WD_Fn,

POE,

FFn

Charge

Pump

Dual

Bandgap

Watchdogs

A81407 Simpliﬁed Block Diagram

A81407-DS, Rev. 2

MCO-0000748

December 1, 2020

12 3 4 5 6 7...58

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