Texas Instruments LP87702-Q1 Bedienungsanleitung

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LP87702-Q1 Dual Buck Converter and 5-V Boost With Diagnostic Functions

1 Features

•AEC-Q100 Qualified for Automotive Applications:

–Device Temperature Grade 1: –40°C to

+125°C, T

A

•Functional Safety Quality-Managed

–Documentation Available to Aid Functional

Safety System Design

–Two Inputs for External Voltage Monitoring

–Two Programmable Power-Good Signals

–Dedicated Reference Voltage for Diagnostics

–Window Watchdog with Reset Output

–Output Short-Circuit and Overload Protection

–Overtemperature Warning and Protection

–Overvoltage Protection (OVP) and

Undervoltage Lockout (UVLO)

•Two High-Efficiency Step-Down DC/DC

converters:

–Maximum Output Current 3.5 A

–2-MHz, 3-MHz, or 4-MHz Switching Frequency

–Auto PWM/PFM and Forced-PWM Operations

–Output Voltage = 0.7 V to 3.36 V

•5-V Boost Converter

–Maximum Output Current 600 mA

•External Clock Input to Synchronize Switching

•Spread-Spectrum Modulation

•Programmable Start-up and Shutdown Delays and

Sequencing with Enable Signal

•Configurable General Purpose Outputs (GPOs)

•I

2

C-Compatible Interface Supporting Standard

(100 kHz), Fast (400 kHz), Fast+ (1 MHz), and

High-Speed (3.4 MHz) Modes

•Interrupt Function with Programmable Masking

2 Applications

•Automotive Radar

•Automotive Camera

•Automotive Sensor Fusion

•Industrial Radar

•Building Automation

3 Description

The LP87702-Q1 helps meet the power management

requirements of the latest platforms, particularly in

automotive radar and camera and industrial radar

applications. The device contains two step-down

DC/DC converters, and a 5-V boost converter

to support safety critical applications. The device

integrates two voltage monitoring inputs for external

power supplies and a window watchdog.

The automatic PWM/PFM (AUTO mode) operation

gives high efficiency over a wide output current range

for buck converters. The LP87702-Q1 uses remote

voltage sensing to compensate IR drop between the

converter output and the point-of-load, thus improving

the accuracy of the output voltage.

Device Information

(1)

PART NUMBERPACKAGEBODY SIZE (NOM)

LP87702-Q1VQFN (32)5.00 mm × 5.00 mm

(1)See the orderable addendum at the end of the data sheet for

all available packages.

Copyright © 2017, Texas Instruments Incorporated

SW_B0VIN_B0

VIN_B1

VANA

VIN

FB_B0

VOUT0

LOAD

SDA (EN3)

SCL (EN2)

nINT

CLKIN (GPO2/WD_DIS)

GNDs

EN1

SW_B1

FB_B1

VOUT1

PG0

VMON1

VMON2

PG1 (GPO1)

WDIWD_RESET

SW_BST

VOUT_BST

VOUT2

LOAD

LOAD

GPO0

NRST

Simplified Schematic

Output Current (mA)

Efficiency (%)

11010010005000

50

60

70

80

90

100

Exce

VIN=3.3V, VOUT=1.2V

VIN=3.3V, VOUT=1.8V

VIN=3.3V, VOUT=2.3V

Buck Efficiency vs Output Current

LP87702-Q1

SNVSAL1C – DECEMBER 2017 – REVISED JUNE 2021

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.

Produktspezifikationen