Texas Instruments LP87702 Bedienungsanleitung

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

1 Features

•FMEDA and Functional Safety Manual Available

to Support System-Level Functional Safety

Requirements up to SIL-2 (IEC 61508)

•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 600 mA Boost Converter

•Two Inputs for External Voltage Monitoring

•Two Programmable Power-Good Signals

•Dedicated Reference Voltage for Diagnostics

•Window Watchdog with Reset Output

•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

•Interrupt Function with Programmable Masking

•Output Short-Circuit and Overload Protection

•Overtemperature Warning and Protection

•Overvoltage Protection (OVP) and Undervoltage

Lockout (UVLO)

2 Applications

•Building Automation:

–Automated Doors and Gates

–Motion Detector (PIR/Motion Sensor)

–Video Surveillance:

•Occupancy Detection (People Tracking,

People Counting)

•Factory Automation:

–Industrial Robot – Safety Area Scanner

–Autonomous Guided Vehicle (AGV)

–Level Transmitter – Sensing

•Industrial Transport:

–Traffic Enforcement

–Intersection Monitoring

–Road-Railway Sensors

–Intelligent Lighting Sensors

•Appliances:

–AC Control

–Appliances User Interface and Connectivity

Modules

3 Description

The LP87702 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.

This device contains one-time-programmable (OTP)

memory. Each orderable part number has specific

OTP settings for a given application. Details of the

default OTP configuration for each orderable part

number is found in the technical reference manual.

Device Information

(1)

PART NUMBERPACKAGEBODY SIZE (NOM)

LP87702VQFN (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

SNVSBU3 – MARCH 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