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LD1084D2T33RSTN/a6000avaiLOW DROP POSITIVE VOLTAGE REGULATOR ADJUSTABLE AND FIXED
LD1084D2T-R |LD1084D2TRSTN/a53980avaiLOW DROP POSITIVE VOLTAGE REGULATOR ADJUSTABLE AND FIXED


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LD1084D2T33R-LD1084D2T-R
LOW DROP POSITIVE VOLTAGE REGULATOR ADJUSTABLE AND FIXED
1/20February 2005 TYPICAL DROPOUT 1.3V (AT 5A) THREE TERMINAL ADJUSTABLE OR FIXED
OUTPUT VOLTAGE 1.5, 1.8V, 2.5V, 2.85V,
3.3V, 3.6V, 5V, 8V, 9V, 12V. GUARANTEED OUTPUT CURRENT UP TO OUPUT TOLERANCE ±1% AT 25°C AND
±2% IN FULL TEMPERATURE RANGE INTERNAL POWER AND THERMAL LIMIT WIDE OPERATING TEMPERATURE RANGE
-40°C TO 125°C PACKAGE AVAILABLE: TO-220, D2 PAK, 2 PAK/A PINOUT COMPATIBILITY WITH STANDARD
ADJUSTABLE VREG
DESCRIPTION

The LD1084 is a LOW DROP Voltage Regulator
able to provide up to 5A of Output Current.
Dropout is guaranteed at a maximum of 1.5V at
the maximum output current, decreasing at lower
loads. The LD1084 is pin to pin compatible with
the older 3-terminal adjustable regulators, but has
better performances in term of drop and output
tolerance.
A 2.85V output version is suitable for SCSI-2
active termination. Unlike PNP regulators, where
a part of the output current is wasted as quiescent
current, the LD1084 quiescent current flows into
the load, so increase efficiency. Only a 10µF
minimum capacitor is need for stability.
The device is supplied in TO-220, D2 PAK and2 PAK/A. On chip trimming allows the regulator to
reach a very tight output voltage tolerance, within
±1% at 25°C.
LD1084
SERIES

5A LOW DROP POSITIVE VOLTAGE
REGULATOR ADJUSTABLE AND FIXED
Figure 1: Schematic Diagram

Rev. 4
LD1084 SERIES
2/20
Figure 2: Application Circuits
Figure 3: Pin Connection (top view)
Table 1: Order Codes

(*) Available in Tape & Reel with the suffix "R" for fixed versions and "-R" for adjustable version
LD1084 SERIES
3/20
Table 2: Absolute Maximum Ratings

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
Table 3: Thermal Data
Table 4: Electrical Characteristics Of LD1084#15 (V
I =4.5V, CI = CO =10µF, TA = -40 to 125°C, unless
otherwise specified.)
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
LD1084 SERIES
4/20
Table 5: Electrical Characteristics Of LD1084#18 (V
I =4.8V, CI = CO =10µF, TA = -40 to 125°C, unless
otherwise specified.)
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
Table 6: Electrical Characteristics Of LD1084#25 (VI=5.5V, CI = CO =10µF, TA = -40 to 125°C, unless

otherwise specified.)
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
LD1084 SERIES
5/20
Table 7: Electrical Characteristics Of LD1084#285 (V
I =5.85V, CI = CO =10µF, TA = -40 to 125°C,
unless otherwise specified.)
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
Table 8: Electrical Characteristics Of LD1084#33 (VI=6.3V, CI = CO =10µF, TA = -40 to 125°C, unless

otherwise specified.)
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
LD1084 SERIES
6/20
Table 9: Electrical Characteristics Of LD1084#36 (V
I =6.6V, CI = CO =10µF, TA = -40 to 125°C, unless
otherwise specified.)
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
Table 10: Electrical Characteristics Of LD1084#5 (VI=8V, CI = CO =10µF, TA = -40 to 125°C, unless

otherwise specified.)
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
LD1084 SERIES
7/20
Table 11: Electrical Characteristics Of LD1084#8 (V
I =11V, CI = CO =10µF, TA = -40 to 125°C, unless
otherwise specified.)
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
Table 12: Electrical Characteristics Of LD1084#9 (VI=12V, CI = CO =10µF, TA = -40 to 125°C, unless

otherwise specified.)
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
LD1084 SERIES
8/20
Table 13: Electrical Characteristics Of LD1084#12 (V
I =15V, CI = CO =10µF, TA = -40 to 125°C, unless
otherwise specified.)
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
LD1084 SERIES
9/20
Table 14: Electrical Characteristics Of LD1084 (V
I =4.25V, CI = CO =10µF, TA = -40 to 125°C, unless
otherwise specified.)
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
LD1084 SERIES
10/20
TYPICAL CHARACTERISTICS (unless otherwise specified T
j = 25°C, CI =10µF (tant.), CO =22µF (tant.)
Figure 4: Short Circuit Current vs Dropout

Voltage
Figure 5: Line Regulation vs Temperature


Figure 6: Quiescent Current vs Temperature


Figure 7: Output Voltage vs Temperature


Figure 8: Load Regulation vs Temperature


Figure 9: Quiescent Current vs Output Voltage


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