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SPX2920M3-5-0 Datasheet(PDF) 5 Page - Sipex Corporation

Part # SPX2920M3-5-0
Description  400mA Low Drop Out Voltage Regulator with Shutdown
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SPX2920M3-5-0 Datasheet(HTML) 5 Page - Sipex Corporation

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Date: 03/02/06
SPX2920 400mA Low Drop Out Voltage Regulator with Shutdown
©Copyright 2006 Sipex Corporation
Error Detection Comparator Output
The Comparator produces a logic low output
whenever the SPX2920 output falls out of
regulation by more than about 5%. This is
around 60mV offset divided by the 1.235
reference voltage. This trip level remains 5%
below normal regardless of the programmed
output voltage of the regulator. Figure 1
shows the timing diagram depicting the ER-
ROR signal and the regulator output voltage
as the SPX2920 input is ramped up and
down. The ERROR signal becomes low at
around 1.3V input, and goes high around 5V
input (input voltage at which V
OUT = 4.75V).
Since the SPX2920’s dropout voltage is
load dependent, the input voltage trip point
(around 5V) will vary with the load current.
The output voltage trip point (approximately
4.75V) does not vary with load.
The error comparator has an open-col-
lector output, which requires an external
pull-up resistor. Depending on the system
requirements the resistor may be returned
to 5V output or other supply voltage. In
determining the value of this resistor, note
that the output is rated to sink 400µA; this
value adds to battery drain in a low battery
condition. Suggested values range from
100K to 1MΩ. If the output is unused this
resistor is not required.
Programming the Output Voltage of
SPX2920
The SPX2920 may be pin-strapped for 5V
or 3.3V using its internal voltage divider by
tying Pin 1 (output) to Pin 2 (sense) and Pin
7 (feedback) to Pin 6 (5V/3.3V Tap).
Also, it may be programmed for any output
voltage between its 1.235V reference and
its 20V maximum rating. As seen on the
front page, an external pair of resistors is
required.
Refer to the equation below for the program-
ming of the output voltage:
V
OUT = VREF x ( 1 + R1/ R2 )+ IFBR1
The V
REF is 1.235 and IFB is the feedback
bias current, nominally -20nA. The minimum
recommended load current of 1µA forces an
upper limit of 1.2MΩ on the value of R
2. If no
load is presented, the I
FB produces an error
of typically 2% in V
OUT, which may be elimi-
nated at room temperature by trimming R
1.
To improve the accuracy choose the value of
R
2 = 100kΩ; this reduces the error by 0.17%
and increases the resistor program current
by 12µA. Since the SPX2920 typically draws
60µA at no load with Pin 2 open-circuited,
this is a small price to pay.
Reducing Output Noise
It may be an advantage to reduce the AC
noise present at the output. One way is to
reduce the regulator bandwidth by increas-
ing the size of the output capacitor. This
is the only way that noise can be reduced
on the 3 lead SPX2920 but it is relatively
inefficient; as increasing the capacitor from
1µF to 220µF only decreases the noise
from 430µV to 160µV Vrms for a 100kHz
bandwidth at 5V output.
Noise could also be reduced fourfold by
a bypass capacitor across R
1, since it re-
duces the high frequency gain from 4 to
unity. Pick
C
BYPASS ≅1 / 2πR1 x 200 Hz
or choose 0.01µF. When doing this, the
output capacitor must be increased to 3.3µF
to maintain stability. These changes reduce
the output noise from 430µV to 100µV Vrms
for a 100kHz bandwidth at 5V output. With
the bypass capacitor added, noise no longer
scales with output voltage so that improve-
ments are more dramatic at higher output
+
+
+
+
4.75V
OUTPUT
VOLTAGE
ERROR*
_______
INPUT
VOLTAGE
1.3V
5.0V
* See Application Info.
Figure 1. ERROR Output Timing


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