原标题：On Semi NCV8855多输出电源控制解决方案

　　On Semi公司的NCV8855是集成了高边负载开关的多输出电源控制器/稳压器,能满足汽车无线系统和仪表盘电源的要求. NCV8855还集成了开关电源(SMPS)降压控制器,2.5A SMPS降压稳压器和两个低压降(LDO)线性稳压器控制器,和超低静态电流的NCV861x一起能组成8输出的无线系统或仪表盘电源解决方案.器件满足ES−XW7T−1A278−AB测试脉冲G负载条件,VIN工作电压9.0V-18.0V.本文介绍了NCV8855主要特性, 应用电路/方框图, 汽车无线电系统框图以及NCV8855评估板电路图与材料清单.

　　The NCV8855 is a multiple output controller / regulator IC with an integrated high−side load switch. The NCV8855 addresses automotive radio system and instrument cluster power supply requirements. In addition to the high−side load switch, the NCV8855 includes a switch−mode power supply (SMPS) buck controller, a 2.5 A SMPS buck regulator and two low dropout (LDO) linear regulator controllers. The NCV8855 in combination with the ultra−low quiescent current NCV861x IC forms an eight−output automotive radio or instrument cluster power solution. The NCV8855 has an internally set switching frequency of 170 kHz, with a SYNC pin for external frequency synchronization.

　　The NCV8855 is intended to supply power to various loads, such as a tuner, CD logic, audio processor and CD / tape control within a car radio. The high−side switch can be used for a CD / tape mechanism or switching an electrically−powered antenna or display unit. In an instrument cluster application, the NCV8855 can be used to power graphics display, flash memory and CAN transceivers. In addition, the high−side switch can be used to limit power to a TFT display during a battery over−voltage condition.

　　NCV8855主要特性:

　　• < 1 uA Shutdown Current

　　• Meets ES−XW7T−1A278−AB Test Pulse G – Loaded Conditions

　　• VIN Operating Range 9.0 to 18.0 V

　　• 1 SMPS Controller with Adjustable Current Limit

　　• 1 SMPS Regulator with Internal 300 m NMOS Switch

　　• 2 LDO Controllers with Current Limit and Short Circuit Protection

　　• 1 High−side Load Switch with Internal 300 m NMOS FET

　　• Adjustable Output Voltage for All Controllers / Regulators

　　• 800 mV, +/-1% Reference Voltage

　　• System Enable Pin

　　• Single Enable Pin for Both LDO Controllers

　　• Independent Enable for High−side Load Switch

　　• Thermal Shutdown with Thermal Warning Indicator

　　• This is a Pb−Free Device

　　NCV8855应用:

　　• Automotive Radio

　　• Instrument Cluster, Driver Information System (DIS)

　　图1. NCV8855应用电路/方框图

　　图2. NCV8855和NCV8612汽车无线电系统框图

　　NCV8855评估板

　　图3.评估板NCV8855BMNR2GEV外形图

　　评估板NCV8855BMNR2GEV材料清单: