NCV8881中文资料Switcher with watchdog and reset数据手册ONSEMI规格书

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

应用 Application

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

简介

NCV8881属于集成电路（IC）的线性稳压器控制器。由制造生产的NCV8881稳压器 - 线性 + 开关此产品族中的产品用于构建执行 DC-DC 转换或电压调节功能的电路，采用的是开关模式和线性稳压器功能的组合。虽然具体的拓扑各不相同，但此类产品的主要目的是将开关模式技术的效率优势与线性稳压技术的低噪声特性结合在一起。