Micrel MIC22950 10A降压开关电源稳压方案

Micrel 公司的MIC22950 是高效率10A开关电源同步降压稳压器,开关频率从400kHz 到 2MHz可编程, 2MHz开关频率时宽负载范围内的效率超过95%. MIC22950工作电压2.6V到5.5V,可调整输出电压到0.7V,输出电流高达10A,主要用于高功率密度点负载转换,基站,服务器和路由器,蓝光播放器,DVD刻录机,计算机外设以及FPGA, DSP和低压ASIC电源.本文介绍MIC22950主要特性, 功能方框图, 10A 同步 DC/DC转换器以及应用电路图和材料清单.
The Micrel MIC22950 is a high efficiency 10A integrated switch synchronous buck (step-down) regulator. The MIC22950 switching frequency is programmable from 400kHz to 2MHz, allowing the customer to optimize designing either for efficiency or for the smallest footprint. The MIC22950 achieves over 95% efficiency while still switching at 2MHz over a broad load range.
The ultra-high speed control loop keeps the output voltage within regulation, even under extreme transient load swings commonly found in FPGAs and low voltage ASICs.
The output voltage can be adjusted down to 0.7V in order to address all low voltage power needs. The MIC22950 features a full range of sequencing andtracking options. The enable and the delay pins, combined with the power good pin, allow multiple outputs to be sequenced in several ways during turn on and turn off. The RC (Ramp Control™) pin allows the device to be connected to any another device in the MIC22x00 family of products, to keep the output voltages within a certain delta V during start up.
The MIC22950 is available in a 32-pin 5mm x 5mm MLF® with a junction operating range from -40℃ to +125℃
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MIC22950主要特性:
• 2.6V to 5.5V supply voltage
• Fully integrated MOSFET switches
• Adjustable output voltage option down to 0.7V
• Output load current up to 10A
• Full sequencing and tracking capability
• Power On Reset
• Efficiency > 95% across a broad load range
• Operating frequency programmable: 400kHz to 2MHz
• Ultra-fast transient response
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