描述 Description

The NCV8881 consists of a Buck switching regulator (SMPS) with a combination SMPS output undervoltage monitor and CPU watchdog circuit. In addition, two fixed-voltage low dropout regulator outputs are provided, and share an LDO output voltage status output. Once enabled, regulator operation continues until the Watchdog signal is no longer present. The NCV8881 is intended for Automotive, battery-connected applications that must withstand a 40 V load dump. The switching regulator is capable of converting the typical 9 V to 19 V automotive input voltage range to outputs from 3.3 V to 8 V at a constant switching frequency, which can be resistor programmed or synchronized to an external clock signal. Enable input threshold and hysteresis are programmable, with the enable input state replicated at an open drain Ignition Buffer output. The regulators are protected by current limiting, input overvoltage and overtemperature shutdown, as well as SMPS short circuit shutdown.

特性 Features

? 1.5 A Switching Regulator (internal power switch)
? 100 mA, 5 V LDO Output
? 40 mA, 8.5 V LDO Output
? Operating Range 5 V to 19 V
? Programmable SMPS Frequency
? SMPS can be Synchronized to an External Clock
? Programmable SMPS Output Voltage Down to 0.8 V
? ±2% Reference Voltage Tolerance
? Internal SMPS Soft-Start
? Voltage-mode SMPS Control
? SMPS Cycle-by-Cycle Current Limit and Short-Circuit Protection
? Internal Bootstrap Diode
? Logic level Enable Input
? Enable Input Hysteresis Programmable by External Resistor Divider
? Enable Input State is Replicated at an Open Drain Output
? CPU Watchdog with Resistor Programmable Delays
? Watchdog Reset Output also Indicates SMPS Output Out of Regulation
? Battery Input Withstands Load Dump to 40 V
? Low Standby Current
? Thermal Shutdown (TSD)
? NCV Prefix for Automotive and Other Applications Requiring Site and Change Controls
? These are Pb-Free Devices

應用 Application

? Audio
? Infotainment
? Safety - Vision Systems
? Instrumentation
? Automotive Systems

簡介

NCV8881屬于集成電路（IC）的線性穩(wěn)壓器控制器。由制造生產(chǎn)的NCV8881穩(wěn)壓器 - 線性 + 開關(guān)此產(chǎn)品族中的產(chǎn)品用于構(gòu)建執(zhí)行 DC-DC 轉(zhuǎn)換或電壓調(diào)節(jié)功能的電路，采用的是開關(guān)模式和線性穩(wěn)壓器功能的組合。雖然具體的拓撲各不相同，但此類產(chǎn)品的主要目的是將開關(guān)模式技術(shù)的效率優(yōu)勢與線性穩(wěn)壓技術(shù)的低噪聲特性結(jié)合在一起。