LD1084V12 [STMICROELECTRONICS]
5 A low drop positive voltage regulator adjustable and fixed; 5低压降正稳压器可调和固定
| 型号： | LD1084V12 |
| 厂家： | 
ST |
| 描述： | 5 A low drop positive voltage regulator adjustable and fixed |
| 文件： | 总19页 (文件大小：782K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LD1084xx
5 A low drop positive voltage regulator adjustable and fixed
Features
■ Typical dropout 1.3 V (at 5 A)
■ Three terminal adjustable or fixed output
voltage 2.5 V, 5 V, 12 V.
■ Guaranteed output current up to 5 A
■ Output 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
TO-220
■ Package available: TO-220
■ Pinout compatibility with standard adjustable
VREG
The device is supplied in TO-220. On chip
trimming allows the regulator to reach a very tight
output voltage tolerance, within 1 % at 25 °C.
Description
The LD1084xx is a low drop voltage regulator
able to provide up to 5 A of output current.
Dropout is guaranteed at a maximum of 1.5 V at
the maximum output current, decreasing at lower
loads. The LD1084xx is pin to pin compatible with
the older 3-terminal adjustable regulators, but has
better performances in term of drop and output
tolerance.
A 2.85 V 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 LD1084xx quiescent current flows
into the load, so increase efficiency. Only a 10 µF
minimum capacitor is need for stability.
Table 1.
Device summary
Part numbers
Order codes
Output voltage
LD1084XX12
LD1084XX25
LD1084XX50
LD1084XX
LD1084V12
LD1084V25
LD1084V50
LD1084V
12 V
2.5 V
5.0 V
Adjustable
April 2008
Rev 8
1/19
www.st.com
19
Contents
LD1084xx
Contents
1
2
3
4
5
6
7
8
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2/19
LD1084xx
1
Diagram
Diagram
Figure 1.
Schematic diagram
3/19
Pin configuration
LD1084xx
2
Pin configuration
Figure 2.
Pin connections (top view)
4/19
LD1084xx
3
Maximum ratings
Maximum ratings
Table 2.
Absolute maximum ratings
Symbol
Parameter
Value
Unit
VI
IO
DC input voltage
30
V
Output current
Internally limited
Internally limited
-55 to +150
mA
mW
°C
PD
Power dissipation
TSTG
TOP
Storage temperature range
Operating junction temperature range
-40 to +125
°C
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied
Table 3.
Symbol
Thermal data
Parameter
Thermal resistance junction-case
Thermal resistance junction-ambient
TO-220
Unit
RthJC
RthJA
3
°C/W
°C/W
50
5/19
Schematic application
LD1084xx
4
Schematic application
Figure 3.
Application circuit
R2
⎛
⎞
⎠
VO = VREF ⋅ 1 + ------
⎝
R1
6/19
LD1084xx
Electrical characteristics
5
Electrical characteristics
Table 4.
Symbol
Electrical characteristics of LD1084#25
(V = 5.5 V, C = C = 10 µF, T = -40 to 125 °C, unless otherwise specified).
I
I
O
A
Parameter
Test condition
Min.
Typ. Max.
Unit
IO = 0 mA, TJ = 25°C
2.475
2.45
2.5
2.5
0.5
0.1
3
2.525
2.55
6
V
V
VO
Output voltage (1)
Line regulation
Load regulation
IO = 0 to 5A, VI = 4.1 to 30V
I
O = 0 mA, VI = 4.1 to 18V, TJ = 25°C
IO = 0 mA, VI = 4.1 to 18V
mV
mV
mV
mV
V
ΔVO
ΔVO
6
I
I
O = 0 to 5A, TJ = 25°C
O = 0 to 5A
15
7
20
Vd
Iq
Dropout voltage
IO = 5A
1.3
5
1.5
10
Quiescent current
VI ≤ 30V
mA
A
VI - VO = 5V
VI - VO = 25V
TA = 25°C, 30ms pulse
5.5
0.5
6.5
0.7
Isc
Short circuit current
Thermal regulation
A
0.003 0.015 %/W
f = 120 Hz, CO = 25µF, IO = 5A
VI = 7.5 ± ±3V
SVR
eN
Supply voltage rejection
60
72
dB
%
RMS output noise voltage
(% of VO)
TA = 25°C, f = 10Hz to 10kHz
0.003
S
S
Temperature stability
Long term stability
0.5
0.5
%
%
TA = 125°C, 1000Hrs
1. See short-circuit current curve for available output current at fixed dropout.
7/19
Electrical characteristics
LD1084xx
Table 5.
Electrical characteristics of LD1084#50
(V = 8 V, C = C = 10 µF, T = -40 to 125 °C, unless otherwise specified).
I
I
O
A
Symbol
Parameter
Test condition
Min.
Typ. Max.
Unit
IO = 0 mA, TJ = 25°C
4.95
4.9
5
5
5.05
5.1
10
V
V
VO
Output voltage (1)
Line regulation
Load regulation
IO = 0 to 5A, VI = 6.6 to 30V
I
I
I
O = 0 mA, VI = 6.6 to 20V, TJ = 25°C
O = 0 mA, VI = 6.6 to 20V
O = 0 to 5A, TJ = 25°C
0.5
1
mV
mV
mV
mV
V
ΔVO
ΔVO
10
5
20
IO = 0 to 5A
IO = 5A
10
1.3
5
35
Vd
Iq
Dropout voltage
1.5
10
Quiescent current
VI ≤ 30V
mA
A
VI - VO = 5V
VI - VO = 25V
TA = 25°C, 30ms pulse
5.5
0.5
6.5
0.7
Isc
Short circuit current
A
Thermal regulation
0.003 0.015 %/W
f = 120 Hz, CO = 25µF, IO = 5A
VI = 10 ± ±3V
SVR
eN
Supply voltage rejection
60
72
dB
%
RMS output noise voltage
(% of VO)
TA = 25°C, f =10Hz to 10kHz
0.003
S
S
Temperature stability
Long term stability
0.5
0.5
%
%
TA = 125°C, 1000Hrs
1. See short-circuit current curve for available output current at fixed dropout.
8/19
LD1084xx
Electrical characteristics
Table 6.
Symbol
Electrical characteristics of LD1084#12
(V = 15 V, C = C = 10 µF, T = -40 to 125 °C, unless otherwise specified).
I
I
O
A
Parameter
Test condition
Min.
Typ. Max.
Unit
IO = 0 mA, TJ = 25°C
11.88
11.76
12
12
12.12
12.24
V
V
VO
Output voltage (1)
Line regulation
Load regulation
IO = 0 to 5A, VI = 13.6 to 30V
IO = 0 mA, VI = 13.6 to 25V,
TJ = 25°C
2
25
mV
ΔVO
ΔVO
IO = 0 mA, VI = 13.6 to 25V
4
25
36
72
1.5
10
mV
mV
mV
V
I
I
O = 0 to 5A, TJ = 25°C
O = 0 to 5A
12
24
1.3
5
Vd
Iq
Dropout voltage
IO = 5A
Quiescent current
VI ≤ 30V
mA
A
VI - VO = 5V
VI - VO = 25V
TA = 25°C, 30ms pulse
5.5
0.5
6.5
0.7
Isc
Short circuit current
Thermal regulation
A
0.003 0.015 %/W
f = 120 Hz, CO = 25µF, IO = 5A
VI = 17 ± ±3V
SVR
eN
Supply voltage rejection
54
66
dB
%
RMS output noise voltage
(% of VO)
TA = 25°C, f =10Hz to 10kHz
0.003
S
S
Temperature stability
Long term stability
0.5
0.5
%
%
TA = 125°C, 1000Hrs
1. See short-circuit current curve for available output current at fixed dropout.
9/19
Electrical characteristics
LD1084xx
Table 7.
Electrical characteristics of LD1084
(V = 4.25 V, C = C =10 µF, T = -40 to 125 °C, unless otherwise specified).
I
I
O
A
Symbol
Parameter
Test condition
Min.
Typ. Max.
Unit
IO = 10mA TJ = 25°C
1.237
1.225
1.25 1.263
1.25 1.275
V
V
VO
Output voltage (1)
Line regulation
IO = 10mA to 3A, VI = 2.85 to 30V
IO = 10mA, VI = 2.85 to 16.5V,
TJ = 25°C
0.015
0.2
%
ΔVO
IO = 10mA, VI = 2.85 to 16.5V
0.035
0.1
0.2
1.3
3
0.2
0.3
0.4
1.5
10
%
%
%
V
I
I
O = 10mA to 5A, TJ = 25°C
O = 0 to 5A
ΔVO
Load regulation
Dropout voltage
Vd
IO = 5A
IO(min) Minimum load current
VI = 30V
mA
A
VI - VO = 5V
VI - VO = 25V
TA = 25°C, 30ms pulse
5.5
0.5
6.5
0.7
Isc
Short circuit current
A
Thermal regulation
Supply voltage rejection
Adjust pin current
0.003 0.015 %/W
f = 120 Hz, CO = 25µF,CADJ = 25 µF,
IO = 5A, VI = 6.25 ± ±3V
SVR
IADJ
60
72
dB
VI = 4.25V, IO = 10 mA
55
120
5
μA
μA
ΔIADJ Adjust pin current change (1)
IO = 10mA to 5A, VI = 2.85 to 16.5V
0.2
RMS output noise voltage
(% of VO)
eN
TA = 25°C, f =10Hz to 10kHz
0.003
%
S
S
Temperature stability
Long term stability
0.5
0.5
%
%
TA = 125°C, 1000Hrs
1. See short-circuit current curve for available output current at fixed dropout.
10/19
LD1084xx
Typical application
6
Typical application
Unless otherwise specified T = 25°C, C = 10µF (tant.), C = 22µF (tant.)
J
Short circuit current vs dropout
voltage
I
O
Figure 4.
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
11/19
Typical application
LD1084xx
Figure 10. Quiescent current vs input voltage Figure 11. Dropout voltage vs output current
Figure 12. Supply voltage rejection vs output Figure 13. Dropout voltage vs temperature
current
Figure 14. Supply voltage rejection vs
temperature
Figure 15. Supply voltage rejection vs
frequency
12/19
LD1084xx
Typical application
Figure 16. Adjust pin current vs output
current
Figure 17. Reference voltage vs temperature
Figure 18. Load regulation vs temperature
Figure 19. Adjust pin current vs temperature
Figure 20. Line regulation vs temperature
Figure 21. Minimum load current vs
temperature
13/19
Typical application
LD1084xx
Figure 22. Supply voltage rejection vs
temperature
Figure 23. Supply voltage rejection vs
frequency
Figure 24. Stability
Figure 25. Supply voltage rejection vs output
current
Figure 26. Stability
Figure 27. Line transient
VI=14 to 15V, IO=200mA,CI = 1µF(tant), CO=10µF(tant),
ts=tf=5ms
14/19
LD1084xx
Typical application
Figure 28. Line transient
Figure 29. Load transient
VI=15 V, IO=0.1 to 5 A, CI = 1µF(tant), CO=10µF(tant)
VI=12 to 13V, IO=200mA, CI = 1µF(tant), CO=10µF(tant), No
CADJ ts=tf=5μs
Figure 30. Load transient
Figure 31. Line transient
VI=12 to 13V, IO=200mA, CI = 1µF(tant), CO=10µF(tant),
VI=15 V, IO=0.1 to 5 A, CI = 1µF(tant), CO=10µF(tant), No
CADJ
C
ADJ = 1μF ts=tf=5μs
Figure 32. Load Transient
VI=13 V, IO=0.1 to 5 A, CI = 1µF(tant), CO=10µF(tant)
15/19
Package mechanical data
LD1084xx
7
Package mechanical data
®
In order to meet environmental requirements, ST offers these devices in ECOPACK
packages. These packages have a lead-free second level interconnect. The category of
second Level Interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.
16/19
LD1084xx
Package mechanical data
TO-220 mechanical data
mm.
inch.
Dim.
Min.
4.40
1.23
2.40
Typ.
Max.
4.60
1.32
2.72
Min.
0.173
0.048
0.094
Typ.
Max.
0.181
0.051
0.107
A
C
D
D1
E
1.27
0.050
0.49
0.61
1.14
1.14
4.95
2.4
0.70
0.88
1.70
1.70
5.15
2.7
0.019
0.024
0.044
0.044
0.194
0.094
0.393
0.027
0.034
0.067
0.067
0.203
0.106
0.409
F
F1
F2
G
G1
H2
L2
L4
L5
L6
L7
L9
DIA.
10.0
10.40
16.4
0.645
13.0
2.65
15.25
6.2
14.0
2.95
15.75
6.6
0.511
0.104
0.600
0.244
0.137
0.147
0.551
0.116
0.620
0.260
0.154
0.151
3.5
3.93
3.85
3.75
P011C
17/19
Revision history
LD1084xx
8
Revision history
Table 8.
Document revision history
Revision
Date
Changes
07-Oct-2004
08-Feb-2005
16-Jun-2005
04-Apr-2007
07-Jun-2007
3
4
5
6
7
Mistake order codes - Table 1.
Mistake U.M. Load Regulation - V ==> mV.
Order codes updated.
Order code updated.
Order codes updated.
Modified: Table 1 on page 1. Removed: packages D²PAK, D²PAK/A and
mechanical data.
08-Apr-2008
8
18/19
LD1084xx
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