MIC2133 datasheet(28/50 Pages) MICROCHIP

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DS20006653B-page 28

MIC2133

FIGURE 4-15:

EN Pin Sequencing.

When the EN pin voltage is below the lower EN thresh-

old, the MIC2133 goes into Shutdown mode. When in

Shutdown mode, the MIC2133 stops switching and all

internal control circuitry switches off to reduce the qui-

escent current. The EN pin, along with the PG pin, can

be used for sequencing multiple MIC2133 devices. It is

recommended that the VIN be powered up before the

EN signal.

4.5.11

ADAPTIVE VOLTAGE POSITIONING

(AVP), ALSO KNOWN AS DROOP

FUNCTION (RECOMMENDED FOR

CCM ONLY)

In some high-current applications, a requirement on a

precisely controlled output impedance is imposed. This

dependence of output voltage on load current is often

termed, “droop”, “load line” regulation or Adaptive

Voltage Positioning (AVP).

The basic functionality of the AVP function is to achieve

a controlled output resistance for the buck regulator so

that at 0A load, the output is +Ɛ% higher than the nom-

inal voltage and, at maximum load, the output is -Ɛ%

related to the nominal output value, as shown in the fol-

lowing figure.

FIGURE 4-16:

AVP Ideal Output Resistive

Characteristic.

It is necessary to achieve the resistive characteristic

above over the full frequency range of output loads.

FIGURE 4-17:

VOUT Load Transient Error

without AVP/DROOP.

FIGURE 4-18:

VOUT Load Transient Error

with AVP/DROOP.

PVDD/VDD

UVLO

Bias ready

Vout

Bypass

VI N

VOUT

OUTPUT CURRENT (A)

IOUT(MAX)

VOUT=VOUT×2

VOUT(DC)

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