原标题：IR IR3870M 10A高效高集成DC稳压方案

　　IR 公司的IR3870M是10A高效高集成DC/DC电压稳压器,具有可编程开关频率,软起动和超温保护等特性.输入电压从3V到26V, 输出电压从0.5V到12V,可连续输出10A电流,主要用在笔记本和台式电脑,游戏机,消费类电子如STB,LCD TV,打印机以及通用的POL DC/DC转换器.本文介绍IR3870M主要特性,方框图, 笔记本电脑应用方框图和用作电荷泵的应用电路图以及评估板IRDC3870主要特性,电路图和材料清单(B)M).

　　The IR3870M SupIRBuckTM is an easy-to-use, fully integrated and highly efficient DC/DC voltage regulator. The onboard constant on time hysteretic controller and MOSFETs make IR3870 a space-efficient solution that delivers up to 10A of precisely controlled output voltage in 60°C ambient temperature applications without airflow.Programmable switching frequency, soft start, and over current protection allows for a very flexible solution suitable for many different applications. The combination of the gate drive charge pump option and constant on time control allow efficiency optimization in the whole output current range, making this device an ideal choice for battery powered applications.

　　Additional features include pre-bias startup, very precise 0.5V reference, over/under voltage shut down, power good output, and enable input with voltage monitoring capability.

　　IR3870M主要特性:

　　• Input Voltage Range: 3V to 26V

　　• Output Voltage Range: 0.5V to 12V

　　• Continuous 10A Load Capability

　　• Constant On-Time control

　　• Excellent Efficiency at very low output current levels

　　• Gate drive charge pump option to maximize efficiency at higher output current levels

　　• Compensation Loop not Required

　　• Programmable switching frequency, soft start, and over current protection

　　• Power Good Output

　　• Precision Voltage Reference (0.5V, +/-1%)

　　• Enable Input with Voltage Monitoring Capability

　　• Pre-bias Start Up

　　• Under/Over Voltage Fault Protection

　　• Ultra small, low profile 5 x 6mm QFN Package

　　IR3870M 应用:

　　• Notebook and desktop computers

　　• Game consoles

　　• Consumer electronics - STB, LCD TV, Printers

　　• General purpose POL DC-DC Converters

　　图1.IR3870M方框图

　　图2.IR3870M笔记本电脑应用方框图

　　图3.IR3870M用作电荷泵的应用电路图

　　Application Circuit with Charge Pump used to boost Sync FET gate drive voltage from 5V to ~7V, resulting in improved efficiency at higher output current levels

　　F = 500kHz, VOUT = 1.1V

　　IR3870M评估板IRDC3870

　　主要特性:

　　•Vin= +12V Typical ( 8-19V input Voltage range. see note below)

　　•PVcc= +5.0V

　　•Vcc=+3.3V

　　•Vout = +1.1V @ 0-10A

　　•Fs = 500kHz @ 10A

　　•L = 0.56uH

　　•Cin= 1x10uF (ceramic 1210) + 1x68uF (electrolytic)

　　•Cout= 2x10uF (ceramic 0805) + 1x150uF(SP Cap)

　　图4.评估板IRDC3870外形图

　　评估板IRDC3870材料清单(BOM):

　　采用全陶瓷电容的评估板IRDC3870材料清单(BOM):