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ISL80101IR08Z-T Datasheet(PDF) 7 Page - Intersil Corporation

Part # ISL80101IR08Z-T
Description  High Performance 1A LDO
Download  15 Pages
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL80101IR08Z-T Datasheet(HTML) 7 Page - Intersil Corporation

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7
FN6931.0
December 21, 2009
Functional Description
Enable Operation
The Enable turn-on threshold is typically 0.8V with a
hysteresis of 80mV. The Enable pin doesn't have an
internal pull-up or pull-down resistor. As a result, this pin
must not be left floating. This pin must be tied to VIN if it
is not used. A pull-up resistor (typically 1kΩ to 10kΩ) will
be required for applications that use open collector or
open drain outputs to control the Enable pin. The Enable
pin may be connected directly to VIN for applications that
are always on.
Soft-Start Operation
The soft-start circuit controls the rate at which the output
voltage comes up to regulation at power-up or coming
out of a chip disable. A constant current charges an
external soft-start capacitor. The external capacitor
always gets discharged to 0V at start-up of after coming
out of a chip disable. The discharge rate is the RC time
constant of an internal resistance and CSS. The soft-start
function effectively limits the amount of in-rush current
below the programmed current limit during start-up or
an enable sequence to avoid an overcurrent fault
condition. This can be an issue for applications that
require large, external bulk capacitances on VOUT where
high levels of charging current can be seen for a
significant period of time. High in-rush currents can
cause VIN to drop below minimum which could cause
VOUT to shutdown. Equation 3 can be used to calculate
CSS for a desired in-rush current. Where VOUT is the
output voltage, COUT is the total capacitance on the
output and IINRUSH is the desired in-rush current.
The following scope in Figure 3 captures the response for
the soft-start function.The output voltage is set to 1.8V.
Also
The rise time of the regulator output voltage for a given
CSS value can be calculated using Equation 2.
Power-Good Operation
The PGOOD circuit monitors VOUT and signals a fault
condition when VOUT is below 85% of the nominal output
voltage. The PGOOD flag is an open-drain NMOS that can
sink 10mA during a fault condition. The PGOOD pin
requires an external pull up resistor which is typically
connected to the VOUT pin. The PGOOD pin should not
be pulled up to a voltage source greater than VIN. During
a fault condition, the PGOOD output is pulled low. The
PGOOD fault can be caused by the current limit fault or
low input voltage. The PGOOD does not function during
thermal shutdown and when the part is disabled.
C
SS
V
OUT xCOUTx2μA )
()
I
INRUSH x0.5 V
-----------------------------------------------------------
=
(EQ. 1)
FIGURE 3. IN-RUSH CURRENT WITH NO CSS,
COUT = 1000µF, IN-RUSH CURRENT = 1.8A
FIGURE 4. IN-RUSH CURRENT WITH CSS = 15nF,
COUT = 1000µF, IN-RUSH CURRENT = 0.5A
FIGURE 5. IN-RUSH CURRENT WITH CSS = 33nF,
COUT = 1000µF, IN-RUSH CURRENT = 0.2A
t
RAMP
C
SSx0.5V
2
μA
----------------------------
=
(EQ. 2)
ISL80101


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