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LP8772x-Q1 Three Buck Converters, One Linear Regulator and One Load Switch for

mmWave 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 to aid ISO 26262 functional

safety system design up to ASIL-B

–BUCK, LDO and load switch output and

Input supply overvoltage and undervoltage

monitoring

–Q&A Watchdog

–Level or PWM error signal monitor (ESM)

–ABIST and CRC

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

•3 high-efficiency, low noise, high frequency step-

down DC/DC converters:

–Output voltage: 0.8 V, 0.82 V, 0.9 V to 1.9 V

with 20 mV output voltage step

–Maximum output current: 3.5 A

–Switching frequency: 4.4 MHz, 8.8 MHz, and

17.6 MHz

•600 mA linear regulator with bypass \ load switch

mode (LDO_LS1)

–Input voltage, LDO mode: 1.2 V to 4 V

–Output voltage: 0.6 V to 3.4 V with 50 mV

output voltage step

–Input voltage, bypass \ load switch mode: 1.6 V

to 3.4 V

•400 mA load switch (LS2)

–Input voltage range: 1.6 V to 3.6 V

–On resistance 3.3-V input, 200 mA: 75 mΩ -typ

•Output short-circuit and overload protection

•Regulator output dynamic voltage scaling (DVS)

through I2C interface

•Input overvoltage protection (OVP) and

undervoltage lockout (UVLO)

•Two general purpose voltage monitors shared with

LDO_LS1 and LS2 output

•Overtemperature warning and protection

•I2C interface supporting standard, fast mode, fast-

mode+ and optional I2C address selection

2 Applications

•Satellite radar

•Short and medium range corner radar

•Ultra-short range radar

•Long range front radar

•Low ripple, low noise applications

3 Description

The LP8772x-Q1 device is designed to meet the

power management requirements of the AWR, IWR,

and other MMICs in various automotive and industrial

radar applications. The device has three step-down

DC/DC converters, a LDO regulator, and a load

switch. The LDO is powered externally and intended

for supplying Ethernet device or any other device in

the system. The load switch is intended to cut off the

3.3 V IO supply during the sensor sleep mode. The

device is controlled by I2C communication interface

and by enable signals.

The low noise step-down DC/DC converters support

factory programmed switching frequency of 17.6 MHz

or 8.8 MHz or 4.4 MHz. High switching frequency

and low noise across wide frequency range, enables

LDO-free power solution which helps to reduce the

solution cost and improve thermal performance. The

switching clock is forced to PWM mode for excellent

RF performance and can also be synchronized to

an external clock. The LP8772x-Q1 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 NUMBERPACKAGE

(1)

PACKAGE SIZE

(2)

LP8772x-Q1RAG (VQFN-HR, 24)4.00 mm × 4.00 mm

(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

V

IN

FB_B1

VOUT1

LOAD

PVIN_LS2/

nINT/GPIO

GNDs

ENABLE

SW_B2

FB_B2

VOUT2

nERR/WD_DIS

VOUT_LDO_LS1

/VMON1

VOUT4

LOAD

LOAD

SW_B3

FB_B3

VOUT3

LOAD

PVIN_B3

SCL

SDA

nRSTOUT

VOUT_VLDO

VOUT_LS2

/VMON2

/SYNCCLK

VOUT5

LOAD

PVIN_LDO_LS1

V

IN

VOUT3

Simplified Schematic

LP87725-Q1

SNVSCC5 – DECEMBER 2023

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.

Produktspecifikationer