MAX1623EAP+
数据手册.pdfMAXIM INTEGRATED PRODUCTS MAX1623EAP+ 直流-直流开关同步降压稳压器, 可调, 4.5V-5.5V输入, 2.5V-3.3V/3A输出, 350 kHz, SSOP-20
The is a 3A, low voltage, step-down regulator with synchronous rectification and internal switches in 20 pin SSOP package. This switch-mode buck regulator with synchronous rectification provides local CPU and bus-termination power in notebook and desktop computers. An internal 55Mohm typ, 3A PMOS power switch and 60Mohm typ, 3A NMOS synchronous-rectifier switch deliver continuous load currents up to 3A from a 5V supply with 95% typical efficiency. Output accuracy is ±1%, including line and load regulation. It features constant-off-time, current-mode pulse-width-modulation PWM control with switching frequencies as high as 350KHz. An external resistor at TOFF pin sets off-time allowing optimum design flexibility in terms of switching frequency, output switching noise and inductor size. It is used in CPU daughter card supply, DSP supply and desktop computer bus-termination supply.
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- Input voltage range from 4.5V to 5.5V
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- Operating temperature range from -40°C to +85°C
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- Minimal external components
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- Pin-selectable fixed 3.3V and 2.5V output voltage
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- Typical supply current is 400µA
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- Shutdown supply current is < 1µA
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- Constant-off-time PWM operation
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- Idle Mode operation at light loads
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- Thermal shutdown protection