MIC5166 datasheet(16/36 Pages) MICROCHIP

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MIC5166

DS20006085B-page 16

 2018 - 2019 Microchip Technology Inc.

FIGURE 4-2:

Power Good Threshold.

The PG has an open-drain output. A pull-up resistor

must be connected to VBIAS, VIN, or an external source.

The external source voltage must not exceed the

maximum rating of the pin. The PG pin can be

connected to another regulator’s enable pin for

sequencing of the outputs.

4.6

VBIAS Requirement

A 1 µF ceramic input capacitor is required on the VBIAS

pin. To achieve the ultra-fast transient response, the

MIC5166 uses an all N-channel power output stage as

shown in the Functional Block Diagram. The high-side

N-channel MOSFET requires the VBIAS voltage to be

2.2V higher than the VTT to be able to fully enhance the

high-side MOSFET.

4.7

VIN Requirement

VIN is used to supply the rail voltage for the high-side

N-channel power output stage. It is normally connected

to VDDQ, but it can be connected to a lower voltage to

reduce power dissipation. In this case, the input voltage

must be higher than the VTT voltage to ensure that the

output stage is not operating in dropout.

REF

0.90*VREF

0.88*VREF

1.10*VREF

1.08*VREF

MIC5166 データシート(PDF) 16 Page - Microchip Technology