MAX1651ESA+

MAXIM INTEGRATED PRODUCTS  MAX1651ESA+  芯片, 降压直流/直流控制器, 双路模式

The is a 3.3V or adjustable, high efficiency, low dropout, step down DC to DC controller in 8 pin NSOIC package. The BiCMOS, step down, DC to DC switching controller provides high efficiency over loads ranging from 1mA to more than 2.5A. A unique, current limited pulse-frequency-modulated PFM control scheme gives this device the benefits of pulse width modulation PWM converter high efficiency at heavy loads while using only 100µA of supply current. Dropout performance down to 300mV is provided by a high switch duty cycle 96.5% and a low current-sense threshold of 110mV. A high switching frequency up to 300KHz allows this device to use miniature external components. It has a dropout voltage less than 0.3V at 500mA and accepts input voltages up to 16V. The step-down controllers drive external P-channel MOSFETs at loads greater than 12.5W. If less power is required, use the MAX639/MAX640/MAX653 step-down converters with on-chip FETs which allow up to 225mA load current.

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Supply voltage range is 3V to 16V

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Operating temperature range from -40°C to 85°C

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More than 90% efficiency 10mA to 1.5A loads

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Output power is 12.5W

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Maximum shutdown supply current is 5µA

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Current limited control scheme

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Switching frequency is up to 300KHz