LT3957AEUHE#PBF

LINEAR TECHNOLOGY  LT3957AEUHE#PBF  直流-直流开关升压, 反相, SEPIC稳压器, 可调, 3V-40V输入, 600mA输出, 1.2MHz, QFN-36

The is a current-mode DC-to-DC Converter which is capable of generating either positive or negative output voltage. It can be configured as either a boost, flyback, SEPIC or inverting converter. It features an internal low side N-channel power MOSFET rated for 40V at 5A and driven from an internal regulated 5.2V supply. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages. The operating frequency of LT3957A can be set with an external resistor over a 100kHz to 1MHz range and can be synchronized to an external clock using the SYNC pin. A minimum operating supply voltage of 3V and a low shutdown quiescent current of less than 1µA, make the LT3957A ideally suited for battery-powered systems. The LT3957A features soft-start and frequency foldback functions to limit inductor current during start-up. The LT3957A has improved load transient performance compared to the LT3957.

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Single feedback pin for positive or negative output voltage

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Current-mode control provides excellent transient response

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Synchronizable to an external clock

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Programmable input undervoltage lockout with hysteresis

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Programmable soft-start

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Internal 5.2V low dropout voltage regulator