LD1085XX25 [STMICROELECTRONICS]
3 A low drop positive voltage regulator adjustable and fixed; 3低压降正电压调节器可调节和固定
| 型号： | LD1085XX25 |
| 厂家： | 
ST |
| 描述： | 3 A low drop positive voltage regulator adjustable and fixed |
| 文件： | 总27页 (文件大小：942K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LD1085xx
3 A low drop positive voltage regulator adjustable and fixed
Features
■ Typical dropout 1.3 V (at 3 A)
■ Three terminal adjustable or fixed output
voltage 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5 V.
■ Guaranteed output current up to 3 A
■ Output tolerance 1ꢀ at 25 °C and 2ꢀ in full
TO-220
TO-220FP
temperature range
■ Internal power and thermal limit
■ Wide operating temperature range -40 °C to
125 °C
■ Package available: TO-220, TO-220FP,
D2PAK
D2PAK/A
2
2
DPAK
DPAK, D PAK, D PAK/A
■ Pinout compatibility with standard adjustable
VREG
The device is supplied in TO-220, TO-220FP,
2
2
DPAK, D PAK and D PAK/A. On chip trimming
allows the regulator to reach a very tight output
voltage tolerance, within 1ꢀ at 25 °C.
Description
The LD1085xx is a low drop voltage regulator
able to provide up to 3 A of output current.
Dropout is guaranteed at a maximum of 1.2 V at
the maximum output current, decreasing at lower
loads. The LD1085xx 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 LD1085xx quiescent current flows
into the load, so increase efficiency. Only a 10 µF
minimum capacitor is need for stability.
Table 1.
Device summary
Part number
LD1085XX
LD1085XX15
LD1085XX18
LD1085XX25
LD1085XX33
LD1085XX50
December 2007
Rev 19
1/27
www.st.com
27
Contents
LD1085xx
Contents
1
2
3
4
5
6
7
8
9
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2/27
LD1085xx
1
Diagram
Diagram
Figure 1.
Schematic diagram
3/27
Pin configuration
LD1085xx
2
Pin configuration
Figure 2.
Pin connections (top view)
TO-220
TO-220FP
D2PAK
D2PAK/A
DPAK
4/27
LD1085xx
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
D2PAK
Parameter
TO-220
DPAK
Unit
D2PAK/A
RthJC
RthJA
Thermal resistance junction-case
Thermal resistance junction-ambient
3
8
3
°C/W
°C/W
50
100
62.5
5/27
Schematic application
LD1085xx
4
Schematic application
Figure 3.
Application circuit
R2
1 + ------
R1
⎛
⎝
⎞
⎠
VO = VREF
⋅
6/27
LD1085xx
Electrical characteristics
5
Electrical characteristics
Table 4.
Symbol
Electrical characteristics of LD1085#15
(V = 4.5 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
1.485
1.47
1.5
1.5
0.2
0.4
2
1.515
1.53
4
V
V
VO
Output voltage (1)
Line regulation
Load regulation
IO = 0 to 3A, VI = 3.1 to 30V
I
O = 0 mA, VI = 3.1 to 18V, TJ = 25°C
IO = 0 mA, VI = 3.1 to 15V
mV
mV
mV
mV
V
ΔVO
ΔVO
4
I
I
O = 0 to 3A, TJ = 25°C
O = 0 to 3A
10
4
20
Vd
Iq
Dropout voltage
IO =3 A
1.3
5
1.5
10
Quiescent current
VI ≤30V
mA
A
VI - VO = 5V
VI - VO = 25V
TA = 25°C, 30ms pulse
3.2
0.2
4.5
0.5
Isc
Short circuit current
Thermal regulation
A
0.008 0.04
72
ꢀ/W
f = 120 Hz, CO = 25µF, IO = 3A
VI = 7.5 3V
SVR
eN
Supply voltage rejection
60
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.
7/27
Electrical characteristics
LD1085xx
Table 5.
Electrical characteristics of LD1085#18
(V = 4.8 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
1.782
1.764
1.8
1.8
0.2
0.4
2
1.818
1.836
4
V
V
VO
Output voltage (1)
Line regulation
Load regulation
IO = 0 to 3A, VI = 3.4 to 30V
I
I
I
O = 0 mA, VI = 3.4 to 18V TJ = 25°C
O = 0 mA, VI = 3.4 to 15V
O = 0 to 3A, TJ = 25°C
mV
mV
mV
mV
V
ΔVO
ΔVO
4
10
IO = 0 to 3A
IO = 3 A
4
20
Vd
Iq
Dropout voltage
1.3
5
1.5
10
Quiescent current
VI ≤30V
mA
A
VI - VO = 5V
VI - VO = 25V
TA = 25°C, 30ms pulse
3.2
0.2
4.5
0.5
Isc
Short circuit current
Thermal regulation
A
0.008 0.04
72
ꢀ/W
f = 120 Hz, CO = 25µF, IO = 3A
VI = 7.5 3V
SVR
eN
Supply voltage rejection
60
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.
8/27
LD1085xx
Electrical characteristics
Table 6.
Symbol
Electrical characteristics of LD1085#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
0.2
0.4
2
2.525
2.55
4
V
V
VO
Output voltage (1)
Line regulation
Load regulation
IO = 0 to 3A, VI = 4.1 to 30V
I
I
I
O = 0 mA, VI = 4.1 to 18V, TJ = 25°C
O = 0 mA, VI = 4.1 to 18V
O = 0 to 3A, TJ = 25°C
mV
mV
mV
mV
V
ΔVO
ΔVO
4
10
IO = 0 to 3A
IO = 3A
4
20
Vd
Iq
Dropout voltage
1.3
5
1.5
10
Quiescent current
VI ≤30V
mA
A
VI - VO = 5V
VI - VO = 25V
TA = 25°C, 30ms pulse
3.2
0.2
4.5
0.5
Isc
Short circuit current
Thermal regulation
A
0.008 0.04
72
ꢀ/W
f = 120 Hz, CO = 25µF, IO = 3A
VI = 7.5 3V
SVR
eN
Supply voltage rejection
60
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.
9/27
Electrical characteristics
LD1085xx
Table 7.
Electrical characteristics of LD1085#33
(V = 6.3 V, C = C =10 µF, T = -40 to 125 °C, unless otherwise specified).
I
I
O
A
Symbol
Parameter
Test condition
Min.
Typ. Max.
3.3 3.333
3.35 3.366
Unit
IO = 0 mA, TJ = 25°C
3.267
3.234
V
V
VO
Output voltage (1)
Line regulation
Load regulation
IO = 0 to 3A, VI = 4.9 to 30V
I
I
I
O = 0 mA, VI = 4.9 to 18V, TJ = 25°C
O = 0 mA, VI = 4.9 to 18V
O = 0 to 3A, TJ = 25°C
0.5
1
6
6
mV
mV
mV
mV
V
ΔVO
ΔVO
3
15
20
1.5
10
IO = 0 to 3A
IO = 3A
7
Vd
Iq
Dropout voltage
1.3
5
Quiescent current
VI ≤30V
mA
A
VI - VO = 5V
VI - VO = 25V
TA = 25°C, 30ms pulse
3.2
0.2
4.5
0.5
Isc
Short circuit current
Thermal regulation
A
0.008 0.04
72
ꢀ/W
f = 120 Hz, CO = 25µF, IO = 3A
VI = 8.3 3V
SVR
eN
Supply voltage rejection
60
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.
10/27
LD1085xx
Electrical characteristics
Table 8.
Symbol
Electrical characteristics of LD1085#50
(V = 8 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
4.95
4.9
5
5
5.05
5.1
10
V
V
VO
Output voltage (1)
Line regulation
Load regulation
IO = 0 to 3A, 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 3A, TJ = 25°C
0.5
1
mV
mV
mV
mV
V
ΔVO
ΔVO
10
5
10
IO = 0 to 3A
IO = 3A
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
3.2
0.2
4.5
0.5
Isc
Short circuit current
A
Thermal regulation
0.008 0.04
72
ꢀ/W
f = 120 Hz, CO = 25µF, IO = 3A
VI = 10 3V
SVR
eN
Supply voltage rejection
60
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.
11/27
Electrical characteristics
LD1085xx
Table 9.
Electrical characteristics of LD1085#
(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 3A, TJ = 25°C
O = 0 to 3A
ΔVO
Load regulation
Dropout voltage
Vd
IO = 3A
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 = 3A, 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 3A, 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.
12/27
LD1085xx
Typical application
6
Typical application
(Unless otherwise specified T = 25 °C, C = C = 10 µF)
J
I
O
Figure 4.
Output voltage vs temperature
Figure 5.
Output voltage vs temperature
Figure 6.
Output voltage vs temperature
Figure 7.
Short circuit current vs dropout
voltage
Figure 8.
Line regulation vs temperature
Figure 9.
Load regulation vs temperature
13/27
Typical application
LD1085xx
Figure 10. Dropout voltage vs temperature
Figure 11. Dropout voltage vs output current
Figure 12. Adjust pin current vs temperature Figure 13. Quiescent current vs temperature
Figure 14. Line regulation vs temperature
Figure 15. Supply voltage rejection vs output
current
14/27
LD1085xx
Typical application
Figure 16. Supply voltage rejection vs
frequency
Figure 17. Supply voltage rejection vs
temperature
Figure 18. Minimum load current vs
temperature
Figure 19. Stability
Figure 20. Stability
Figure 21. Line transient
VI=12 to 13V, IO=200mA, CI = 1µF(tant), CO=10µF(tant),
CADJ=1µF
15/27
Typical application
LD1085xx
Figure 22. Line transient
Figure 23. Load transient
VI=12 to 13V, IO=200mA, CI = 1µF(tant), CO=10µF(tant),
CADJ=1µF
VI=12V, IO=0.12 to 3A, CI = 1µF(tant), CO=10µF(tant),
CADJ=1µF
Figure 24. Load transient
VI=12V, IO=0.12 to 3A, CI = 1µF(tant), CO=10µF(tant),
CADJ=1µF
16/27
LD1085xx
Package mechanical data
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.
17/27
Package mechanical data
LD1085xx
TO-220 mechanical data
mm.
inch.
Typ.
Dim.
Min.
Typ.
Max.
4.60
1.32
2.72
Min.
0.173
0.048
0.094
Max.
0.181
0.051
0.107
A
C
4.40
1.23
2.40
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
18/27
LD1085xx
Package mechanical data
TO-220FP mechanical data
mm.
inch.
Dim.
Min.
4.40
2.5
Typ
Max.
4.60
2.7
Min.
Typ.
Max.
0.181
0.106
0.108
0.027
0.039
0.059
0.059
0.204
0.106
0.409
A
B
0.173
0.098
0.098
0.017
0.030
0.045
0.045
0.194
0.094
0.393
D
2.5
2.75
0.70
1
E
0.45
0.75
1.15
1.15
4.95
2.4
F
F1
F2
G
1.50
1.50
5.2
G1
H
2.7
10.0
10.40
L2
L3
L4
L5
L6
L7
DIA.
16
0.630
28.6
9.8
2.9
15.9
9
30.6
10.6
3.6
1.126
0.385
0.114
0.626
0.354
0.118
1.204
0.417
0.142
0.645
0.366
0.126
16.4
9.3
3
3.2
7012510A-H
19/27
Package mechanical data
LD1085xx
DPAK mechanical data
mm.
inch.
Typ.
Dim.
Min.
Typ.
Max.
Min.
Max.
A
A1
A2
B
2.2
0.9
2.4
1.1
0.23
0.9
5.4
0.6
0.6
6.2
0.086
0.035
0.001
0.025
0.204
0.017
0.019
0.236
0.094
0.043
0.009
0.035
0.212
0.023
0.023
0.244
0.03
0.64
5.2
b4
C
0.45
0.48
6
C2
D
D1
E
5.1
0.200
6.4
6.6
0.252
0.260
E1
e
4.7
0.185
0.090
2.28
e1
H
4.4
9.35
1
4.6
0.173
0.368
0.039
0.181
0.397
10.1
L
(L1)
L2
L4
R
2.8
0.8
0.110
0.031
0.6
0°
1
0.023
0.039
8°
0.2
0.008
V2
8°
0°
0068772-F
20/27
LD1085xx
Package mechanical data
D2PAK mechanical data
mm.
inch.
Dim.
Min.
Typ.
Max.
Min.
Typ.
Max.
A
A1
A2
B
4.4
4.6
2.69
0.23
0.93
1.7
0.173
0.098
0.001
0.027
0.044
0.017
0.048
0.352
0.181
0.106
0.009
0.036
0.067
0.023
0.053
0.368
2.49
0.03
0.7
B2
C
1.14
0.45
1.23
8.95
0.6
C2
D
1.36
9.35
D1
E
8
0.315
0.335
10
10.4
0.393
0.409
E1
G
8.5
4.88
15
5.28
15.85
1.4
0.192
0.590
0.050
0.055
0.094
0.208
0.624
0.055
0.068
0.126
L
L2
L3
M
1.27
1.4
1.75
3.2
2.4
R
0.4
0.016
V2
0°
8°
0°
8°
P011P6G
21/27
Package mechanical data
LD1085xx
D2PAK/A mechanical data
mm.
inch.
Typ.
Dim.
Min.
Typ.
Max.
Min.
Max.
A
A1
A2
B
4.40
2.49
0.03
0.7
4.60
2.69
0.23
0.93
1.3
0.173
0.098
0.001
0.028
0.031
0.045
0.018
0.048
0.352
0.181
0.106
0.009
0.037
0.051
0.067
0.024
0.054
0.368
B1
B2
C
0.8
1.14
0.45
1.23
8.95
1.7
0.60
1.36
9.35
C2
D
D1
E
8
0.315
0.335
10
10.4
0.394
0.409
E1
G
8.5
4.88
15
5.28
15.85
1.4
0.192
0.591
0.050
0.094
0.208
0.624
0.055
0.126
L
L2
M
1.27
2.4
3.2
R
0.4
0.016
V2
0°
8°
0°
8°
7106164/D
22/27
LD1085xx
Package mechanical data
Tape & reel DPAK-PPAK mechanical data
mm.
Typ.
inch.
Typ.
Dim.
Min.
Max.
330
Min.
Max.
12.992
0.519
A
C
12.8
20.2
60
13.0
13.2
0.504
0.795
2.362
0.512
D
N
T
22.4
7.00
10.60
2.75
4.1
0.882
0.2.76
0.417
0.105
0.161
0.319
Ao
Bo
Ko
Po
P
6.80
10.40
2.55
3.9
6.90
10.50
2.65
4.0
0.268
0.409
0.100
0.153
0.311
0.272
0.413
0.104
0.157
0.315
7.9
8.0
8.1
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Package mechanical data
LD1085xx
Tape & reel D2PAK-P2PAK-D2PAK/A-P2PAK/A mechanical data
mm.
Typ.
inch.
Typ.
Dim.
Min.
Max.
180
Min.
Max.
7.086
0.519
A
C
D
12.8
20.2
60
13.0
13.2
0.504
0.795
2.362
0.512
N
T
14.4
10.70
15.90
5.00
4.1
0.567
0.421
0.626
0.197
0.161
0.476
Ao
Bo
Ko
Po
P
10.50
15.70
4.80
3.9
10.6
15.80
4.90
4.0
0.413
0.618
0.189
0.153
0.468
0.417
0.622
0.193
0.157
0.472
11.9
12.0
12.1
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LD1085xx
Order codes
8
Order codes
Table 10. Order codes
Packages
Output
voltage
TO-220
TO-220FP
D2PAK
DPAK (T&R)
LD1085DT15R
D2PAK/A
D2PAK/A (T&R)
1.5 V
1.8 V
2.5 V
3.3 V
5.0 V
ADJ
LD1085V18
LD1085V25
LD1085V33
LD1085V50
LD1085V
LD1085D2T18R LD1085DT18R
LD1085DT25R
LD1085D2M18R
LD1085D2M25R
LD1085D2M33R
LD1085D2T33R LD1085DT33R
LD1085P
LD1085D2T-R
LD1085D2M
LD1085D2M-R
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Revision history
LD1085xx
9
Revision history
Table 11. Document revision history
Date
Revision
Changes
07-Oct-2004
08-Feb-2005
01-Mar-2005
22-May-2006
10-Nov-2006
04-Apr-2007
07-Jun-2007
05-Dec-2007
12
13
14
15
16
17
18
19
Mistake order codes - Table 1.
Mistake U.M. load regulation - V ==> mV.
Version 1.2 V removed.
Order codes updated.
Add package DPAK, typo on VO test value in tables 3, 4 and 11.
Order codes updated.
Order codes updated.
Modified: Table 10.
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LD1085xx
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