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MIC21LV32 Datasheet(PDF) 25 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) 25 Page - Microchip Technology

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DS20006513A-page 25
MIC21LV32
For linearization and fitting the temperature coefficient
of the bottom MOSFET RDSON, a resistance network
from the ILIM pin to AGND, used with an NTC resistor,
is shown in Figure 4-9.
FIGURE 4-9:
Resistance Network Used
with RNTC Resistor for Linearization and Fitting
the Temperature Coefficient of RDSON.
In case a temperature-independent resistor sensing is
used, a simple temperature constant standard
resistance is used on the ILIM pin.
4.5.3
NEGATIVE CURRENT LIMIT
The MIC21LV32 supports a cycle-by-cycle negative
current limit. The absolute value of the negative
current-limiting threshold is 50% of the programmed
current limit. If the negative low-side MOSFET current
is going to trigger a negative current limit, the low-side
MOSFET will be turned off and allow current through
the high-side MOSFET body diode. During this time,
the output voltage tends to rise, because this protection
limits the current to discharge the output capacitor. In
order to prevent a huge reverse current over the short
limit value, the low-side FET turns on after 500 ns,
maintaining negative current at programmed level.
4.5.4
PRECISION ENABLE (EN)
The precision Enable (EN) input is used to control the
regulator. The precision feature allows the simple
sequencing of multiple power supplies with a resistor
divider from another supply. Connecting this pin to
ground, or to a voltage lower than 1.2V (typ.), will turn
off the regulator. In this state, the current drain from the
input supply is 25 µA (typical) at a 12V input voltage.
The EN input has an internal pull-up of about 6 µA.
Therefore, this pin can be left floating or pulled to a volt-
age greater than 1.2V (typical) to turn the regulator on.
The hysteresis on this input is about 65 mV (typical)
below the 1.2V (typical) threshold. When driving the
enable input, the voltage must never exceed the abso-
lute maximum specification for this pin. Although an
internal pull-up is provided on the EN pin, it is a good
practice to pull the input high when this feature is not
used, especially in noisy environments. This can be
done easily by connecting a high-value resistor (1 MΩ)
between the VIN and EN pins. The MIC21LV32 device
also incorporates an internal input Undervoltage Lock-
out (UVLO) feature. This prevents the regulator from
turning on when the input voltage is not high enough to
properly bias the internal circuitry. The rising threshold
is 4.3V (typ.) while the falling threshold is 3.9V (typ). In
some cases, these thresholds may be too low to
provide good system performance. The solution is to
use the EN input as an external programmable input
UVLO to disable the part when the input voltage falls
below a target lower threshold. This is often used to
prevent excessive battery discharge or early turn-on
during start-up. This method is also recommended to
prevent abnormal device operation in applications
where the input voltage falls below the minimum of 4.5V.
Figure 4-10 shows the connections to implement this
method of UVLO. Equation 4-17 and Equation 4-18
can be used to determine the correct resistor values.
EQUATION 4-17:
EQUATION 4-18:
Due to the 6 µA pull-up, the current in the divider should
be much higher than this. A value of 20 kΩ for RBOT is
a good first choice.
Where:
RTOP = Top Resistor of the VIN Voltage Resistor
Divider
RBOT = Bottom Resistor of the VIN Voltage Resistor
Divider
VOFF = Target VIN Voltage Below which the
Regulator Turns Off
VENTH = Device Enable Upper Threshold Voltage
VENHYS = Enable Threshold Hysteresis
RTOP = RBOT ×
VOFF
VENTH – VENHYS
– 1
Where:
VOFF = Input Voltage where the Regulator
Shuts Off
VON = Input Voltage where the Regulator Turns On
VENHYST = Enable Threshold Hysteresis
VENTH = Enable Upper Threshold Voltage
VON = VOFF ×
VENTH
VENTH – VENHYS


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