本文介绍了ADP1882/ADP1883主要特性,方框图,典型应用电图,大电流评估板电路图和PCB布局图以及15A,20A输出等多种应用电路。ADI 公司的ADP1882/ADP1883是电流模式同步降压电源控制器,具有优异的瞬态响应,最佳的稳定性以及限流保护,可驱多个N沟功率级,降低输出电压低至0.8V。电源输入电压2.75V-20V,偏压电源为2.75V-5.5V,0.8V基准电压有±1.0%精度,工作频率可选择为300kHz,600kHz和1.0MHz,主要用在通信和网络设备,中高端服务器,STB和DSP核电源。
ADP1882/ADP1883主要特性:
Power input voltage as low as 2.75 V to 20 V
Bias supply voltage range: 2.75 V to 5.5 V
Minimum output voltage: 0.8 V
0.8 V reference voltage with ±1.0% accuracy
Supports all N-channel MOSFET power stages
Available in 300 kHz, 600 kHz, and 1.0 MHz opTIons
No current-sense resistor required
Power saving mode (PSM) for light loads (ADP1883 only)
Resistor-programmable current-sense gain
Thermal overload protecTIon
Short-circuit protecTIon
Precision enable input
Integrated bootstrap diode for high-side drive
140 μA shutdown supply current
Starts into a precharged load
Small, 10-lead MSOP package
ADP1882/ADP1883应用:
Telecom and networking systems
Mid to high end servers
Set-top boxes
DSP core power supplies
图1。ADP1882/ADP1883方框图
图2。ADP1882/ADP1883典型应用电图
图3。ADP1882大电流评估板电路图(蓝色为大电流通路)
图4。ADP1882大电流评估板PCB布局图
图5。ADP1882 应用电路:12V输入,1.8V/15A输出,300kHz
图6。ADP1882 应用电路:5.5V输入,2.5V/15A输出,600kHz
图7。ADP1882 应用电路:13V输入,1.8V/20A输出,300kHz