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MIC21LV32 Datasheet(PDF) 27 Page - Microchip Technology

Part No. MIC21LV32
Description  36V Dual Phase, Advanced COT Buck Controller Stackable for Multiphase Operation
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MIC21LV32 Datasheet(HTML) 27 Page - Microchip Technology

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DS20006513A-page 27
MIC21LV32
FIGURE 4-12:
EN Pin Sequencing.
When the EN pin voltage is below the lower EN thresh-
old, the MIC21LV32 goes into Shutdown mode. When
in Shutdown mode, the MIC21LV32 stops switching
and all internal control circuitry switches off to reduce
the quiescent current. The EN pin, along with the
PGOOD pin, can be used for sequencing multiple
MIC21LV32 devices. It is recommended to power up
VIN before the EN signal.
4.5.9
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 nominal output value, as shown in
Figure 4-13.
FIGURE 4-13:
AVP Ideal Output Resistive
Characteristic.
It is necessary to achieve the resistive characteristic
above over the full frequency range of output loads.
FIGURE 4-14:
VOUT Load Transient Error
without AVP/DROOP.
FIGURE 4-15:
VOUT Load Transient Error
with AVP/DROOP.
Figure 4-14 and Figure 4-15 explain how the AVP
design window of ±Ɛ can be used to reduce the amount
of the output capacitor necessary to sustain the load
transient. Alternatively, the AVP can be used to improve
the error of the load transient if it is decided to keep the
same output capacitor.
The DROOP pin is an analog output, which provides a
voltage proportional to the output current in CCM
according to the formula in Equation 4-20.
EQUATION 4-20:
EN
PVDD/VDD
UVLO
Bias ready
Vout
5V
Bypass
VI N
VOUT
VOUT(DC)
VOUT(DC)
Where:
VCSH = Voltage at CSH Pin in CCM
RSENSE = Current Sensing Resistance
IL = Inductor Current per Phase
VDROOP = VCSH – 1.2V = 8 × RSENSE × IL


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