Intersil公司的 ISL62386是高效四输出笔记本电脑电源控制器,包括有两个PWM控制器,可调电压从0.6V到5.5V和两个线性调整器LDO5和LDO3,输出电压分别是固定的5V和3.3V.每个输出能提供100mA电流,在 -10°C 到+100°C范围内输出电压精度为±1%.适用于以电池供电的设备如笔记本电脑和亚小型笔记本电脑,PDA和移动通信设备,以及通用开关降压电源.本文介绍了ISL62386的主要特性和方框图,以及采用电感DCR电流检测与电阻电流检测的典型应用电路图.
ISL62386: High-Efficiency, Quad Output SystemPower Supply Controller for Notebook
Computers
The ISL62386 controller generates supply voltages for battery-powered systems. The ISL62386 includes two pulse-width modulation (PWM) controllers, adjustable from 0.6V to 5.5V, and two linear regulators, LDO5 and LDO3, that generate a fixed 5V output and a fixed 3.3V output respectively. Each can deliver up to 100mA. The Channel 2 switching regulator will automatically take over the LDO5 load when programmed to 5V output. This provides a large power saving and boosts efficiency. The ISL62386 includes on-board power-up sequencing, one power-good (PGOOD) output, digital soft-start, and an internal soft-stop output discharge that prevents negative voltages on shutdown.
The patented R3 PWM control scheme provides a low jitter system with fast response to load transients. Light-load efficiency is improved with period-stretching discontinuous conduction mode (DCM) operation. To eliminate noise in audio frequency applications, an ultrasonic DCM mode is included, which limits the minimum switching frequency to approximately 28kHz.
The ISL62386 is available in a 32 Ld 5x5 TQFN package, and can operate over the extended temperature range (-10°C to +100°C).
ISL62386主要特性:
High Performance R3 Technology
Fast Transient Response
±1% Output Voltage Accuracy: -10°C to +100°C
Two Fully Programmable Switch-Mode Power Supplies with Independent Operation
Programmable Switching Frequency
Integrated MOSFET Drivers and Bootstrap Diode
Fixed +3.3V LDO Output with Enable Control
Fixed +5V LDO with Automatic Switchover to SMPS2
Internal Soft-Start and Soft-Stop Output Discharge
Wide Input Voltage Range: +5.5V to +25V
Full and Ultrasonic Pulse-Skipping Mode
Power-Good Indicator
Overvoltage, Undervoltage and Overcurrent Protection
Thermal Monitor and Protection
Pb-Free (RoHS Compliant)
ISL62386应用:
Notebook and Sub-Notebook Computers
PDAs and Mobile Communication Devices
3-Cell and 4-Cell Li+ Battery-Powered Devices
General Purpose Switching Buck Regulators
图1.ISL62386方框图
图2.ISL62386典型应用电路图(电感DCR电流检测)
图3.ISL62386典型应用电路图(电阻电流检测)
图4.ISL62386典型应用电路图(电感DCR电流检测)
图5.ISL62386典型应用电路图(电阻电流检测和VCC用作使能电源)
