max761, max762 高效率、12v/15v或可调、低iq、升压型dc-dc转换器
max761, max762概述
the max761/max762 step-up switching regulators provide high efficiency over a wide range of load currents, delivering up to 150ma. a unique, current-limited pulse-frequency-modulated (pfm) control scheme gives the devices the benefits of pulse-width-modulated (pwm) converters (high efficiency with heavy loads), while using less than 110µa of supply current (vs. 2ma to 10ma for pwm converters). the result is high efficiency over a wide range of loads.
the max761/max762 input voltage range is 2v to 16.5v. output voltages are preset to 12v (max761) and 15v (max762), or they can be set with two external resistors. with a 5v input, the max761 guarantees a 12v, 150ma output. its high efficiency, low supply current, fast start-up time, shdn controlling capability, and small size make the max761 ideal for powering flash memory.
the max761/max762 have an internal 1a power mosfet, making them ideal for minimum-component, low- and medium-power applications. these devices use tiny external components, and their high switching frequencies (up to 300khz) allow for small surface-mount magnetics.
for increased output drive capability or higher output voltages, use the max770-max773, which are similar in design to the max761/max762, but drive external power mosfets. for stepping up to 5v, see the max756/max757 and max856-max859 data sheets.
关键特性
high efficiency for a wide range of load currents
12v/150ma flash memory programming supply
110µa max supply current
5µa max shutdown supply current
2v to 16.5v input voltage range
12v (max761), 15v (max762) or adjustable output
current-limited pfm control scheme
300khz switching frequency
internal, 1a, n-channel power fet
lbi/lbo low-battery comparator
应用/使用
电池供电应用
闪存编程
高效dc-dc转换器
pcmcia卡
max761, max762应用电路
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MAX761, MAX762 高效率、12V/15V或可调、
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