LP8774x-Q1 Three Buck Converters and 5-V Boost for AWR and IWR Radar Sensors

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: 3.3V nominal (3V to 4V range)

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

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

0.82V (BUCK3)

– Maximum output current: 3A/ 3A/ 3A

– Switching frequency: 4.4MHz, 8.8MHz, and

17.6MHz

• 5V boost converter

– Maximum output current: 350mA

• 150mA LDO

– Output voltage 1.8V or 3.3V

• 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 LP8774x-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 5V boost converter and a 1.8V or

3.3V 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

4.4MHz,

8.8MHz, or 17.6MHz. High switching frequency and

low noise across wide frequency range enable LDO-

free power solution with minimal or no passive

filtering. The high switching frequency 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-of-

load (POL) which improves the accuracy of the output

voltage.

Package Information

PART

NUMBER(1)

PACKAGE

PACKAGE

SIZE(2)

BODY SIZE

(NOM)

LP8774x-Q1

RXV (VQFN-

HR, 28)

4.50mm ×

5.00mm

4.50mm ×

5.00mm

(1)

For all available packages, see the orderable addendum at

the end of the data sheet.

(2)

The package size (length × width) is a nominal value and

includes pins, where applicable.

SW_B1

PVIN_B1

PVIN_B2

VCCA

VIN

FB_B1

VOUT1

LOAD

CS_SPI/WD_DIS

SCK_SPI

nINT

SYNCCLKIN

GNDs

ENABLE

SW_B2

FB_B2

VOUT2

VMON1/GPO1

nERR/GPO2

SW_BST

VOUT_BST

VOUT4

LOAD

LOAD

SW_B3

FB_B3

VOUT3

LOAD

PVIN_B3

SDO_SPI

SDI_SPI

nRSTOUT

VOUT_VLDO

SPI interface

VIO_LDO

VOUT5

Simplified Application

LP87743-Q1, LP87744-Q1, LP87745-Q1

SNVSC48B – OCTOBER 2021 – REVISED JUNE 2024

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.