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UCC381DP-ADJ Datasheet(PDF) 4 Page - Texas Instruments

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Part # UCC381DP-ADJ
Description  Low Dropout 1 Ampere Linear Regulator Family
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC381DP-ADJ Datasheet(HTML) 4 Page - Texas Instruments

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4
UCC281-3/-5/-ADJ
UCC381-3/-5/-ADJ
PIN DESCRIPTIONS
CT: For UCC381-3 and UCC381-5 versions, this is the
shutdown pin which, when pulled low, turns off the regu-
lator output and puts the device in a low current state.
For the UCC381-ADJ version, a capacitor is required be-
tween the CT pin and GND to set the TON time during
overcurrent according to the following (typical) equation:
TC
ON
CT
=•
660 000
,
GND: All voltages are measured with respect to this pin.
This is the low noise ground reference input for regula-
tion. The output decoupling capacitor should be tied to
PIN 7.
VIN: Positive supply input for the regulator. Bypass this
pin to GND with at least 1
µF of low ESR, ESL capaci-
tance if the source is located further than 1 inch from the
device.
VOUT: Output for regulator. The regulator does not re-
quire a minimum output capacitor for stability. Choose
the appropriate size capacitor for the application with re-
spect to the required transient loading. For example, if
the load is very dynamic, a large capacitor will smooth
out the response to load steps.
VOUTS: Feedback for regulator sensing of the output
voltage. For loads which are a considerable resistive dis-
tance from the VOUT pin, the VOUTS pin can be used to
move the resistance into the control loop of the regulator,
thereby effectively canceling the IR drop associated with
the load path. For local regulation, merely connect this
pin directly to the VOUT pin. For the UCC381-ADJ ver-
sion, the output voltage can be set by two external resi-
tors according to the following relationship:
V
R
R
OUT =•
+
125
1
2
1
.
where R1 is a resistor connected between VOUT and
VOUTS and R2 is a resistor connected between VOUTS
and GND.
7
6
3
2
8
5
4
1
1.0
µF
R
1
NOTE 1
R
2
NOTE 1
C
T
NOTE 2
SHUTDOWN
V
IN
CT
VIN
GND
GND
GND
GND
VOUTS
VOUT
OUTPUT
C
OUT
UCC381
TYPICAL APPLICATION CIRCUIT
Note 1: R1 and R2 for adjustable version only. For 3.3V and 5V versions connect VOUT to VOUTS. See Pin Descriptions.
Note 2: C
T timing capacitor is for adjustable version only. For 3.3V and 5V versions, the CT pin is used to enable or shutdown
the part. See Pin Descriptions.
UDG-98148


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