LP877451A1RXVRQ1中文资料德州仪器数据手册PDF规格书

1 Features

• AEC-Q100 qualified with the following results:

– Device temperature grade 1: –40°C to +125°C

ambient operating temperature

• Functional safety-compliant device

– Developed for functional safety applications

– Documentation available to aid ISO 26262

functional safety system design up to ASIL-C/

SIL-2

– Input supply overvoltage and undervoltage

monitoring

– Regulator output overvoltage and undervoltage

monitoring

– Overvoltage and undervoltage monitoring for

one external rail

– Q&A watchdog

– Level or PWM error signal monitor (ESM)

– BIST and CRC

• Input voltage: 3.3 V nominal (3 V to 4 V range)

• Three low-noise step-down DC/DC converters:

– Output voltage: 0.9 V to 1.9 V, 0.8 V (BUCK3),

0.82 V (BUCK3)

– Maximum output current: 3 A/ 3 A/ 3 A

– Switching frequency: 4.4 MHz, 8.8 MHz, and

17.6 MHz

• 5 V boost converter

– Maximum output current: 350 mA

• 150 mA LDO

– Output voltage 1.8 V or 3.3 V

• Output short-circuit and overload protection

• Input overvoltage protection (OVP) and

undervoltage lockout (UVLO)

• Overtemperature warning and protection

• Serial peripheral interface (SPI)

2 Applications

• Short and medium range corner radar

• Long range front radar

• Ultra-short range radar

• Low ripple, low noise applications

3 Description

The LP87745-Q1 device is designed to meet the

power management requirements of the AWR and

IWR MMICs in various automotive and industrial radar

applications. The device has three step-down DC/DC

converters, a 5-V boost converter and a 1.8 V or 3.3

V LDO. The LDO is powered from the boost and

intended for xWR I/O supply. An SPI serial interface

and enable signals control the device.

The step-down DC/DC converters support

programmable switching frequency of 4.4 MHz, 8.8

MHz, or 17.6 MHz. High switching frequency and low

noise across wide frequency range enable LDO-free

power solution with minimal or no passive filtering.

This improves thermals and transient settling for the

MMIC RF rails. The device forces the switching clock

into PWM mode for optimal RF performance and can

also be synchronized to an external clock. The device

supports remote voltage sensing to compensate IR

drop between the regulator output and the point-ofload

(POL) which improves the accuracy of the output

voltage.