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High-Side Switch Using LDO Regulator Controller

Part Number: 2N3906

Abstract:

The Micrel MIC5158 Super LDO™ Voltage Regulator Controller can be used as a high-side switch driver that features a relatively accurate current limit. The part is normally intended for driving the MOSFET pass device of a voltage regulator. It also has constant-current output limiting (see Figure 1, current sensing resistor RS) which becomes active when the drop across RS is approximately 35mV. The similarity that this circuit shares with high-side MOSFET drivers is that it includes a charge-pump for driving N-channel MOSFETs. An advantage is that its current limit is more accurate than that of most high-side drivers.

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Other Part Numbers:

1N4148, 2N3906, IRLZ44, MIC5158

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