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LP87702 Arkusz danych(PDF) 1 Page - Texas Instruments |
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LP87702 Arkusz danych(HTML) 1 Page - Texas Instruments |
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1 / 98 page  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) • I2C-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 NUMBER PACKAGE BODY SIZE (NOM) LP87702 VQFN (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_B0 VIN_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) WDI WD_RESET SW_BST VOUT_BST VOUT2 LOAD LOAD GPO0 NRST Simplified Schematic Output Current (mA) 1 10 100 1000 5000 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. |
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