LTC3126IUFD#PBF

直流/直流开关同步降压稳压器, 可调, 2.4V-42V输入, 818mV-42V输出, 2.5A, PQFN-28

The is a synchronous step down regulator with no loss input PowerPath in 28 pin QFN package. It is a high efficiency buck converter with an internal no-loss PowerPath supporting seamless operation from two separate input power sources. Pin selectable ideal diode-OR and priority input modes with user programmable undervoltage lockout thresholds provide full control over the transition between the input power sources. The fast, automatic switchover provided by internal PowerPath eliminates need for hold-up capacitors and minimizes disturbances on the output rail. A wide 2.4V to 42V input voltage range, 2.5A output current capability and 2µA burst mode operation quiescent current facilitate use of LTC3126 with a wide variety of power sources including super capacitors, automotive batteries, unregulated wall adapters and single to multicell stacks of most battery chemistries. It is used in communications, test equipment and back-up power uninterruptible power supplies.

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Seamless, automatic transition between two input power sources

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Wide output voltage range from 0.818V to VIN and 200KHz to 2.2MHz fixed frequency PWM

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Burst mode operation IQ = 2µA, programmable input UVLO thresholds

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Active input channel indicator, independent input and output power good signals

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95% efficiency at 1A, VIN = 12V, VOUT = 5V

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1µA current in shutdown and synchronizable to an external clock

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Input valid, priority channel and PGOOD indicators

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Internal soft start and thermal protection

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Current mode control with 60ns minimum on-time, minimal external components

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Operating temperature range from -40°C to 125°C