MIC2132 datasheet(29/48 Pages) MICROCHIP

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DS20006654B-page 29

MIC2132

This way, if there is a slight difference between

different chips coming up, the secondaries are

ready when the host is waking up after 3 ms.

The logic input pin, NPI (Next Phase In), of each

part in the daisy-chain has a 136 kΩ resistor to

ground externally near the pin in the application.

This way, if the input is floating because of a bad

connection in the production line, it will be

pushed to 0V, which will stop any activity from

the chip to start. Also, NPI is active only on the

rising edge. If it is floating and with no rising

edge detected, the activity will stop.

When in daisy-chain, the logic pin, ONR (On

Request), from the host as output is going in

each secondary ONR pin configured as an

input. In order to accommodate different VDD

rails from different secondaries and not to inject

too much current in one of the secondaries from

the host, the ONR pin as logic output has a 1 kΩ

pull-up resistor inside. This way, the output ONR

is short-protected ~ 5 mA to ground and the

strength of the injection in the VDD rail of each

secondary is 2k = 1k + 1k. Special precautions

are designed inside so that this small injection

will not trigger latch-up.

Only the error amplifier of the host controller

regulates the output and feedback. The

secondaries are only serving the ONR coming

using the logic pins, NPI and APO, in sequence.

The secondaries also inject ripple in the

feedback in order to allow correct phasing and

regulation. All members in the daisy-chain are

sharing the CSH pin to allow correct (equal)

current sharing.

If the droop feature is required in multiphase

operation, connect all the droop setting resistors

from the DROOP pins of all members in the

daisy-chain to the lower bottom feedback

resistor of the host controller to achieve load line

setting as in dual phase operation.

4.5.11

FREQUENCY PROGRAMMING

The switching frequency per phase in CCM in

two-phase

operation

can

programmed

Equation 4-27 below:

EQUATION 4-27:

4.5.12

THERMAL SHUTDOWN

When the junction temperature of the MIC2132

reaches +160°C or above, the buck converter goes into

thermal shutdown. When the junction temperature falls

below +140°C, the MIC2132 buck converter soft starts

again.

Where:

RFREQ = Resistor Connects from FREQ Pin to AGND.

RFREQ =

20.1 ×109

fSW_PH

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