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
| Marke: | Texas Instruments |
| Kategorie: | Nicht kategorisiert |
| Modell: | LP87702 |
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