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UCC383TD-5 Datasheet(PDF) 7 Page - Texas Instruments

Part # UCC383TD-5
Description  LOW-DROPOUT 3-A LINEAR REGULATOR FAMILY
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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UCC383TD-5 Datasheet(HTML) 7 Page - Texas Instruments

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UCC283-3, UCC283-5, UCC283-ADJ, UCC383-3, UCC383-5, UCC383-ADJ
LOW DROPOUT 3A LINEAR REGULATOR FAMILY
SLUS215B − OCTOBER 1998 − REVISED FEBRUARY 2004
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
dropout performance
Referring to the Block Diagram, the dropout voltage of the UCC383 is equal to the minimum voltage drop (VIN
to VOUT) across the N-channel MOSFET. The dropout voltage is dependent on operating conditions such as
load current, input and load voltages, as well as temperature. The UCC383 achieves a low Rds(on) through the
use of an internal charge-pump (VPUMP) that drives the MOSFET gate. Figure 2 depicts typical dropout voltages
versus load current for the 3.3-V and 5-V versions of the part, as well as the adjustable version programmed
to 3.0 V.
Figure 3 depicts the typical dropout performance of the adjustable version with various output voltages and load
currents.
Operating temperatures also affect the Rds(on) and dropout voltage of the UCC383. Figure 4 graphs the typical
dropout for the 3.3-V and 5-V versions with a 3-A load over temperature.
Figure 2
0
0.1
0.2
0.3
0.4
0.5
1
1.5
2
2.5
3
IOUT (A)
TYPICAL DROPOUT VOLTAGE
vs.
LOAD CURRENT
VOUT = 3.3 V
VOUT = 5 V
VOUT = 3 V
Figure 3
TYPICAL DROPOUT VOLTAGE
vs.
IOUT AND VOUT
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
3
3.5
4
4.5
5
IOUT= 3 A
IOUT= 1.5 A
IOUT= 1 A
VOUT (V)


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