LD1084
SERIES
5A LOW DROP POSITIVE VOLTAGE REGULATOR ADJUSTABLE AND FIXED
■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 5A
■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, D2PAK, D2PAK/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 .
D2PAK
TO-220
D2PAK/A
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, D2PAK and D2PAK/A. On chip trimming allows the regulator to reach a very tight output voltage tolerance, within ±1% at 25°C.
SCHEMATIC DIAGRAM
May 2003 |
1/18 |
LD1084 SERIES
ABSOLUTE MAXIMUM RATINGS
Symbol |
Parameter² |
Value |
Unit |
|
|
|
|
VI |
DC Input Voltage |
30 |
V |
IO |
Output Current |
Internally Limited |
mA |
PD |
Power Dissipation |
Internally Limited |
mW |
Tstg |
Storage Temperature Range |
-55 to +150 |
°C |
Top |
Operating Junction Temperature Range |
-40 to +125 |
°C |
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
THERMAL DATA
Symbol |
Parameter |
TO-220 |
D2PAK |
Unit |
Rthj-case |
Thermal Resistance Junction-case |
3 |
3 |
°C/W |
Rthj-amb |
Thermal Resistance Junction-ambient |
50 |
62.5 |
°C/W |
APPLICATION CIRCUITS
R2 |
VO = VREF (1 + ¾¾) |
R1 |
CONNECTION DIAGRAM (top view)
|
TO-220 |
D2PAK |
D2PAK/A |
2/18 |
|
|
|
|
LD1084 SERIES |
ORDERING CODES |
|
|
|
|
|
|
|
TYPE |
D2PAK (*) |
D2PAK/A |
OUTPUT VOLTAGE |
LD1084V15 |
LD1084D2T15 |
LD1084D2M15 |
1.5 V |
|
|
|
|
LD1084V18 |
LD1084D2T18 |
LD1084D2M18 |
1.8 V |
|
|
|
|
LD1084V25 |
LD1084D2T25 |
LD1084D2M25 |
2.5 V |
|
|
|
|
LD1084V28 |
LD1084D2T28 |
LD1084D2M28 |
2.85 V |
|
|
|
|
LD1084V33 |
LD1084D2T33 |
LD1084D2M33 |
3.3 V |
LD1084V36 |
LD1084D2T36 |
LD1084D2M36 |
3.6 V |
|
|
|
|
LD1084V50 |
LD1084D2T50 |
LD1084D2M50 |
5.0 V |
|
|
|
|
LD1084V80 |
LD1084D2T80 |
LD1084D2M80 |
8.0 V |
|
|
|
|
LD1084V90 |
LD1084D2T90 |
LD1084D2M90 |
9.0 V |
|
|
|
|
LD1084V120 |
LD1084D2T120 |
LD1084D2M120 |
12.0 V |
|
|
|
|
LD1084V |
LD1084D2T |
LD1084D2M |
ADJ |
|
|
|
|
(*) Available in Tape & Reel with the suffix "R" for fixed versions and "-R" for adjustable version
LECTRICAL CHARACTERISTICS OF LD1084#15 (VI=4.5V, CI = CO =10μF, TA = -40 to 125°C, unless otherwise specified.)
Symbol |
Parameter |
Test Conditions |
Min. |
Typ. |
Max. |
Unit |
|
|
|
|
|
|
|
|
|
VO |
Output Voltage |
IO = 0 mA |
TJ = 25°C |
1.485 |
1.5 |
1.515 |
V |
|
|
IO = 0 to 5A |
VI = 3.1 to 30V (note 1) |
1.47 |
1.5 |
1.53 |
V |
VO |
Line Regulation |
IO = 0 mA |
VI = 3.1 to 18V TJ = 25°C |
|
0.5 |
6 |
mV |
|
|
IO = 0 mA |
VI = 3.1 to 15V |
|
0.1 |
6 |
mV |
VO |
Load Regulation |
IO = 0 to 5A |
TJ = 25°C |
|
3 |
15 |
mV |
|
|
IO = 0 to 5A |
|
|
7 |
20 |
V |
Vd |
Dropout Voltage |
IO =5 A |
|
|
1.3 |
1.5 |
V |
Iq |
Quiescent Current |
VI ≤ 30V |
|
|
5 |
10 |
mA |
Isc |
Short Circuit Current |
VI - VO = 5V |
|
5.5 |
6.5 |
|
A |
|
|
VI - VO = 25V |
|
0.5 |
0.7 |
|
A |
|
Termal Regulation |
TA = 25°C, 30ms pulse |
|
0.003 |
0.015 |
%/W |
|
SVR |
Supply Voltage Rejection |
f = 120 Hz, |
CO = 25 μF, IO = 5A |
60 |
75 |
|
dB |
|
|
VI = 6.8 ± 3V |
|
|
|
|
|
eN |
RMS Output Noise Voltage |
TA = 25°C f =10Hz to 10KHz |
|
0.003 |
|
% |
|
|
(% of VO) |
|
|
|
|
|
|
S |
Temperature Stability |
|
|
|
0.5 |
|
% |
|
|
|
|
|
|
|
|
S |
Long Term Stability |
TA = 125°C |
1000Hrs |
|
0.5 |
|
% |
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
3/18
LD1084 SERIES
ELECTRICAL CHARACTERISTICS OF LD1084#18 (VI=4.8V, CI = CO =10μF, TA = -40 to 125°C, unless otherwise specified.)
Symbol |
Parameter |
Test Conditions |
Min. |
Typ. |
Max. |
Unit |
|
|
|
|
|
|
|
|
|
VO |
Output Voltage |
IO = 0 mA |
TJ = 25°C |
1.782 |
1.8 |
1.818 |
V |
|
|
IO = 0 to 5A |
VI = 3.4 to 30V (note 1) |
1.764 |
1.8 |
1.836 |
V |
VO |
Line Regulation |
IO = 0 mA |
VI = 3.4 to 18V TJ = 25°C |
|
0.5 |
6 |
mV |
|
|
IO = 0 mA |
VI = 3.4 to 15V |
|
0.1 |
6 |
mV |
VO |
Load Regulation |
IO = 0 to 5A |
TJ = 25°C |
|
3 |
15 |
mV |
|
|
IO = 0 to 5A |
|
|
7 |
20 |
V |
Vd |
Dropout Voltage |
IO =5 A |
|
|
1.3 |
1.5 |
V |
Iq |
Quiescent Current |
VI ≤ 30V |
|
|
5 |
10 |
mA |
Isc |
Short Circuit Current |
VI - VO = 5V |
|
5.5 |
6.5 |
|
A |
|
|
VI - VO = 25V |
|
0.5 |
0.7 |
|
A |
|
Termal Regulation |
TA = 25°C, 30ms pulse |
|
0.003 |
0.015 |
%/W |
|
SVR |
Supply Voltage Rejection |
f = 120 Hz, |
CO = 25 μF, IO = 5A |
60 |
75 |
|
dB |
|
|
VI = 6.8 ± 3V |
|
|
|
|
|
eN |
RMS Output Noise Voltage |
TA = 25°C f =10Hz to 10KHz |
|
0.003 |
|
% |
|
|
(% of VO) |
|
|
|
|
|
|
S |
Temperature Stability |
|
|
|
0.5 |
|
% |
|
|
|
|
|
|
|
|
S |
Long Term Stability |
TA = 125°C |
1000Hrs |
|
0.5 |
|
% |
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
ELECTRICAL CHARACTERISTICS OF LD1084#25 (VI=5.5V, CI = CO =10μF, TA = -40 to 125°C, unless otherwise specified.)
Symbol |
Parameter |
Test Conditions |
Min. |
Typ. |
Max. |
Unit |
|
|
|
|
|
|
|
|
|
VO |
Output Voltage |
IO = 0 mA |
TJ = 25°C |
2.475 |
2.5 |
2.525 |
V |
|
|
IO = 0 to 5A |
VI = 4.1 to 30V (note 1) |
2.45 |
2.5 |
2.55 |
V |
VO |
Line Regulation |
IO = 0 mA |
VI = 4.1 to 18V TJ = 25°C |
|
0.5 |
6 |
mV |
|
|
IO = 0 mA |
VI = 4.1 to 18V |
|
0.1 |
6 |
mV |
VO |
Load Regulation |
IO = 0 to 5A |
TJ = 25°C |
|
3 |
15 |
mV |
|
|
IO = 0 to 5A |
|
|
7 |
20 |
V |
Vd |
Dropout Voltage |
IO =5 A |
|
|
1.3 |
1.5 |
V |
Iq |
Quiescent Current |
VI ≤ 30V |
|
|
5 |
10 |
mA |
Isc |
Short Circuit Current |
VI - VO = 5V |
|
5.5 |
6.5 |
|
A |
|
|
VI - VO = 25V |
|
0.5 |
0.7 |
|
A |
|
Termal Regulation |
TA = 25°C, 30ms pulse |
|
0.003 |
0.015 |
%/W |
|
SVR |
Supply Voltage Rejection |
f = 120 Hz, |
CO = 25 μF, IO = 5A |
60 |
72 |
|
dB |
|
|
VI = 7.5 ± 3V |
|
|
|
|
|
eN |
RMS Output Noise Voltage |
TA = 25°C f =10Hz to 10KHz |
|
0.003 |
|
% |
|
|
(% of VO) |
|
|
|
|
|
|
S |
Temperature Stability |
|
|
|
0.5 |
|
% |
|
|
|
|
|
|
|
|
S |
Long Term Stability |
TA = 125°C |
1000Hrs |
|
0.5 |
|
% |
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
4/18
LD1084 SERIES
ELECTRICAL CHARACTERISTICS OF LD1084#285 (VI=5.85V, CI = CO =10μF, TA = -40 to 125°C, unless otherwise specified.)
Symbol |
Parameter |
|
Test Conditions |
Min. |
Typ. |
Max. |
Unit |
|
|
|
|
|
|
|
|
VO |
Output Voltage |
IO = 0 mA |
TJ = 25°C |
2.821 |
2.85 |
2.879 |
V |
|
|
IO = 0 to 5A |
VI = 4.5 to 30V (note 1) |
2.793 |
2.85 |
2.907 |
V |
VO |
Line Regulation |
IO = 0 mA |
VI = 4.5 to 18V TJ = 25°C |
|
0.5 |
6 |
mV |
|
|
IO = 0 mA |
VI = 4.5 to 18V |
|
0.1 |
6 |
mV |
VO |
Load Regulation |
IO = 0 to 5A |
TJ = 25°C |
|
3 |
15 |
mV |
|
|
IO = 0 to 5A |
|
|
7 |
20 |
V |
Vd |
Dropout Voltage |
IO =5 A |
|
|
1.3 |
1.5 |
V |
Iq |
Quiescent Current |
VI ≤ 30V |
|
|
5 |
10 |
mA |
Isc |
Short Circuit Current |
VI - VO = 5V |
|
5.5 |
6.5 |
|
A |
|
|
VI - VO = 25V |
0.5 |
0.7 |
|
A |
|
|
Termal Regulation |
TA = 25°C, 30ms pulse |
|
0.003 |
0.015 |
%/W |
|
SVR |
Supply Voltage Rejection |
f = 120 Hz, |
CO = 25 μF, IO = 5A |
60 |
72 |
|
dB |
|
|
VI = 7.85 ± 3V |
|
|
|
|
|
eN |
RMS Output Noise Voltage |
TA = 25°C f =10Hz to 10KHz |
|
0.003 |
|
% |
|
|
(% of VO) |
|
|
|
|
|
|
S |
Temperature Stability |
|
|
|
0.5 |
|
% |
|
|
|
|
|
|
|
|
S |
Long Term Stability |
TA = 125°C |
1000Hrs |
|
0.5 |
|
% |
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
ELECTRICAL CHARACTERISTICS OF LD1084#33 (VI=6.3V, CI = CO =10μF, TA = -40 to 125°C, unless otherwise specified.)
Symbol |
Parameter |
Test Conditions |
Min. |
Typ. |
Max. |
Unit |
|
|
|
|
|
|
|
|
|
VO |
Output Voltage |
IO = 0 mA |
TJ = 25°C |
3.267 |
3.3 |
3.333 |
V |
|
|
IO = 0 to 5A |
VI = 4.9 to 30V (note 1) |
3.234 |
3.35 |
3.366 |
V |
VO |
Line Regulation |
IO = 0 mA |
VI = 4.9 to 18V TJ = 25°C |
|
0.5 |
6 |
mV |
|
|
IO = 0 mA |
VI = 4.9 to 18V |
|
0.1 |
6 |
mV |
VO |
Load Regulation |
IO = 0 to 5A |
TJ = 25°C |
|
3 |
15 |
mV |
|
|
IO = 0 to 5A |
|
|
7 |
20 |
V |
Vd |
Dropout Voltage |
IO =5 A |
|
|
1.3 |
1.5 |
V |
Iq |
Quiescent Current |
VI ≤ 30V |
|
|
5 |
10 |
mA |
Isc |
Short Circuit Current |
VI - VO = 5V |
|
5.5 |
6.5 |
|
A |
|
|
VI - VO = 25V |
|
0.5 |
0.7 |
|
A |
|
Termal Regulation |
TA = 25°C, 30ms pulse |
|
0.003 |
0.015 |
%/W |
|
SVR |
Supply Voltage Rejection |
f = 120 Hz, |
CO = 25 μF, IO = 5A |
60 |
72 |
|
dB |
|
|
VI = 8.3 ± 3V |
|
|
|
|
|
eN |
RMS Output Noise Voltage |
TA = 25°C f =10Hz to 10KHz |
|
0.003 |
|
% |
|
|
(% of VO) |
|
|
|
|
|
|
S |
Temperature Stability |
|
|
|
0.5 |
|
% |
|
|
|
|
|
|
|
|
S |
Long Term Stability |
TA = 125°C |
1000Hrs |
|
0.5 |
|
% |
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
5/18
LD1084 SERIES
ELECTRICAL CHARACTERISTICS OF LD1084#36 (VI=6.6V, CI = CO =10μF, TA = -40 to 125°C, unless otherwise specified.)
Symbol |
Parameter |
Test Conditions |
Min. |
Typ. |
Max. |
Unit |
|
|
|
|
|
|
|
|
|
VO |
Output Voltage |
IO = 0 mA |
TJ = 25°C |
3.564 |
3.6 |
3.636 |
V |
|
|
IO = 0 to 5A |
VI = 5.2 to 30V (note 1) |
3.528 |
3.6 |
3.672 |
V |
VO |
Line Regulation |
IO = 0 mA |
VI = 5.2 to 18V TJ = 25°C |
|
0.5 |
10 |
mV |
|
|
IO = 0 mA |
VI = 5.2 to 18V |
|
0.1 |
10 |
mV |
VO |
Load Regulation |
IO = 0 to 5A |
TJ = 25°C |
|
3 |
15 |
mV |
|
|
IO = 0 to 5A |
|
|
7 |
20 |
V |
Vd |
Dropout Voltage |
IO =5 A |
|
|
1.3 |
1.5 |
V |
Iq |
Quiescent Current |
VI ≤ 30V |
|
|
5 |
10 |
mA |
Isc |
Short Circuit Current |
VI - VO = 5V |
|
5.5 |
6.5 |
|
A |
|
|
VI - VO = 25V |
|
0.5 |
0.7 |
|
A |
|
Termal Regulation |
TA = 25°C, 30ms pulse |
|
0.003 |
0.015 |
%/W |
|
SVR |
Supply Voltage Rejection |
f = 120 Hz, |
CO = 25 μF, IO = 5A |
60 |
72 |
|
dB |
|
|
VI = 8.6 ± 3V |
|
|
|
|
|
eN |
RMS Output Noise Voltage |
TA = 25°C f =10Hz to 10KHz |
|
0.003 |
|
% |
|
|
(% of VO) |
|
|
|
|
|
|
S |
Temperature Stability |
|
|
|
0.5 |
|
% |
|
|
|
|
|
|
|
|
S |
Long Term Stability |
TA = 125°C |
1000Hrs |
|
0.5 |
|
% |
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
ELECTRICAL CHARACTERISTICS OF LD1084#5 (VI=8V, CI = CO =10μF, TA = -40 to 125°C, unless otherwise specified.)
Symbol |
Parameter |
|
Test Conditions |
Min. |
Typ. |
Max. |
Unit |
|
|
|
|
|
|
|
|
VO |
Output Voltage |
IO = 0 mA |
TJ = 25°C |
4.95 |
5 |
5.05 |
V |
|
|
IO = 0 to 5A |
VI = 6.6 to 30V (note 1) |
4.9 |
5 |
5.1 |
V |
VO |
Line Regulation |
IO = 0 mA |
VI = 6.6 to 20V TJ = 25°C |
|
0.5 |
10 |
mV |
|
|
IO = 0 mA |
VI = 6.6 to 20V |
|
1 |
10 |
mV |
VO |
Load Regulation |
IO = 0 to 5A |
TJ = 25°C |
|
5 |
20 |
mV |
|
|
IO = 0 to 5A |
|
|
10 |
35 |
V |
Vd |
Dropout Voltage |
IO =5 A |
|
|
1.3 |
1.5 |
V |
Iq |
Quiescent Current |
VI ≤ 30V |
|
|
5 |
10 |
mA |
Isc |
Short Circuit Current |
VI - VO = 5V |
|
5.5 |
6.5 |
|
A |
|
|
VI - VO = 25V |
0.5 |
0.7 |
|
A |
|
|
Termal Regulation |
TA = 25°C, 30ms pulse |
|
0.003 |
0.015 |
%/W |
|
SVR |
Supply Voltage Rejection |
f = 120 Hz, |
CO = 25 μF, IO = 5A |
60 |
72 |
|
dB |
|
|
VI = 10 ± 3V |
|
|
|
|
|
eN |
RMS Output Noise Voltage |
TA = 25°C f =10Hz to 10KHz |
|
0.003 |
|
% |
|
|
(% of VO) |
|
|
|
|
|
|
S |
Temperature Stability |
|
|
|
0.5 |
|
% |
|
|
|
|
|
|
|
|
S |
Long Term Stability |
TA = 125°C |
1000Hrs |
|
0.5 |
|
% |
NOTE 1: See short-circuit current curve for available output current at fixed dropout.
6/18