STMICROELECTRONICS LD1085D2T18R

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 ±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, TO-220FP,
DPAK, D2PAK, D2PAK/A
■
DPAK
Pinout compatibility with standard adjustable
VREG
TO-220FP
TO-220
D2PAK
D2PAK/A
The device is supplied in TO-220, TO-220FP,
DPAK, D2PAK and D2PAK/A. On chip trimming
allows the regulator to reach a very tight output
voltage tolerance, within ±1% 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
December 2007
LD1085XX
LD1085XX25
LD1085XX15
LD1085XX33
LD1085XX18
LD1085XX50
Rev 19
1/27
www.st.com
27
Contents
LD1085xx
Contents
1
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8
Order codes
9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2/27
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
LD1085xx
Diagram
1
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
Maximum ratings
3
Maximum ratings
Table 2.
Absolute maximum ratings
Symbol
Parameter
Value
Unit
30
V
VI
DC input voltage
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
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.
Thermal data
Symbol
Parameter
TO-220
DPAK
D2PAK
D2PAK/A
Unit
RthJC
Thermal resistance junction-case
3
8
3
°C/W
RthJA
Thermal resistance junction-ambient
50
100
62.5
°C/W
5/27
Schematic application
4
Schematic application
Figure 3.
Application circuit
LD1085xx
R
V O = V REF ⋅ ⎛ 1 + ------2-⎞
⎝
R ⎠
1
6/27
LD1085xx
Electrical characteristics
5
Electrical characteristics
Table 4.
Electrical characteristics of LD1085#15
(VI = 4.5 V, CI = CO =10 µF, TA = -40 to 125 °C, unless otherwise specified).
Symbol
Parameter
Test condition
Min.
Typ.
Max.
Unit
IO = 0 mA, TJ = 25°C
1.485
1.5
1.515
V
IO = 0 to 3A, VI = 3.1 to 30V
1.47
1.5
1.53
V
IO = 0 mA, VI = 3.1 to 18V, TJ = 25°C
0.2
4
mV
IO = 0 mA, VI = 3.1 to 15V
0.4
4
mV
IO = 0 to 3A, TJ = 25°C
2
10
mV
IO = 0 to 3A
4
20
mV
VO
Output voltage (1)
ΔVO
Line regulation
ΔVO
Load regulation
Vd
Dropout voltage
IO =3 A
1.3
1.5
V
Iq
Quiescent current
VI ≤30V
5
10
mA
Isc
Short circuit current
SVR
eN
VI - VO = 5V
3.2
4.5
A
VI - VO = 25V
0.2
0.5
A
Thermal regulation
TA = 25°C, 30ms pulse
Supply voltage rejection
f = 120 Hz, CO = 25µF, IO = 3A
VI = 7.5 ± 3V
RMS output noise voltage (% of
TA = 25°C, f =10Hz to 10kHz
VO)
S
Temperature stability
S
Long term stability
TA = 125°C, 1000Hrs
0.008
60
0.04
%/W
72
dB
0.003
%
0.5
%
0.5
%
1. See short-circuit current curve for available output current at fixed dropout.
7/27
Electrical characteristics
Table 5.
Symbol
LD1085xx
Electrical characteristics of LD1085#18
(VI = 4.8 V, CI = CO =10 µF, TA = -40 to 125 °C, unless otherwise specified).
Parameter
Test condition
Min.
Typ.
Max.
Unit
IO = 0 mA, TJ = 25°C
1.782
1.8
1.818
V
IO = 0 to 3A, VI = 3.4 to 30V
1.764
1.8
1.836
V
IO = 0 mA, VI = 3.4 to 18V TJ = 25°C
0.2
4
mV
IO = 0 mA, VI = 3.4 to 15V
0.4
4
mV
IO = 0 to 3A, TJ = 25°C
2
10
mV
IO = 0 to 3A
4
20
mV
VO
Output voltage (1)
ΔVO
Line regulation
ΔVO
Load regulation
Vd
Dropout voltage
IO = 3 A
1.3
1.5
V
Iq
Quiescent current
VI ≤30V
5
10
mA
Isc
Short circuit current
SVR
eN
VI - VO = 5V
3.2
4.5
A
VI - VO = 25V
0.2
0.5
A
Thermal regulation
TA = 25°C, 30ms pulse
Supply voltage rejection
f = 120 Hz, CO = 25µF, IO = 3A
VI = 7.5 ± 3V
RMS output noise voltage (% of
TA = 25°C, f =10Hz to 10kHz
VO)
S
Temperature stability
S
Long term stability
TA = 125°C, 1000Hrs
1. See short-circuit current curve for available output current at fixed dropout.
8/27
0.008
60
0.04
%/W
72
dB
0.003
%
0.5
%
0.5
%
LD1085xx
Table 6.
Symbol
Electrical characteristics
Electrical characteristics of LD1085#25
(VI = 5.5 V, CI = CO =10 µF, TA = -40 to 125 °C, unless otherwise specified).
Parameter
Test condition
Min.
Typ.
Max.
Unit
IO = 0 mA, TJ = 25°C
2.475
2.5
2.525
V
IO = 0 to 3A, VI = 4.1 to 30V
2.45
2.5
2.55
V
IO = 0 mA, VI = 4.1 to 18V, TJ = 25°C
0.2
4
mV
IO = 0 mA, VI = 4.1 to 18V
0.4
4
mV
IO = 0 to 3A, TJ = 25°C
2
10
mV
IO = 0 to 3A
4
20
mV
VO
Output voltage (1)
ΔVO
Line regulation
ΔVO
Load regulation
Vd
Dropout voltage
IO = 3A
1.3
1.5
V
Iq
Quiescent current
VI ≤30V
5
10
mA
Isc
Short circuit current
SVR
eN
VI - VO = 5V
3.2
4.5
A
VI - VO = 25V
0.2
0.5
A
Thermal regulation
TA = 25°C, 30ms pulse
Supply voltage rejection
f = 120 Hz, CO = 25µF, IO = 3A
VI = 7.5 ± 3V
RMS output noise voltage (% of
TA = 25°C, f =10Hz to 10kHz
VO)
S
Temperature stability
S
Long term stability
TA = 125°C, 1000Hrs
0.008
60
0.04
%/W
72
dB
0.003
%
0.5
%
0.5
%
1. See short-circuit current curve for available output current at fixed dropout.
9/27
Electrical characteristics
Table 7.
Symbol
LD1085xx
Electrical characteristics of LD1085#33
(VI = 6.3 V, CI = CO =10 µF, TA = -40 to 125 °C, unless otherwise specified).
Parameter
Test condition
Min.
Typ.
Max.
Unit
IO = 0 mA, TJ = 25°C
3.267
3.3
3.333
V
IO = 0 to 3A, VI = 4.9 to 30V
3.234
3.35
3.366
V
0.5
6
mV
IO = 0 mA, VI = 4.9 to 18V
1
6
mV
IO = 0 to 3A, TJ = 25°C
3
15
mV
IO = 0 to 3A
7
20
mV
VO
Output voltage (1)
ΔVO
Line regulation
ΔVO
Load regulation
Vd
Dropout voltage
IO = 3A
1.3
1.5
V
Iq
Quiescent current
VI ≤30V
5
10
mA
Isc
Short circuit current
SVR
eN
IO = 0 mA, VI = 4.9 to 18V, TJ = 25°C
VI - VO = 5V
3.2
4.5
A
VI - VO = 25V
0.2
0.5
A
Thermal regulation
TA = 25°C, 30ms pulse
Supply voltage rejection
f = 120 Hz, CO = 25µF, IO = 3A
VI = 8.3 ± 3V
RMS output noise voltage (% of
TA = 25°C, f =10Hz to 10kHz
VO)
S
Temperature stability
S
Long term stability
TA = 125°C, 1000Hrs
1. See short-circuit current curve for available output current at fixed dropout.
10/27
0.008
60
0.04
%/W
72
dB
0.003
%
0.5
%
0.5
%
LD1085xx
Table 8.
Symbol
Electrical characteristics
Electrical characteristics of LD1085#50
(VI = 8 V, CI = CO =10 µF, TA = -40 to 125 °C, unless otherwise specified).
Parameter
Test condition
Min.
Typ.
Max.
Unit
IO = 0 mA, TJ = 25°C
4.95
5
5.05
V
IO = 0 to 3A, VI = 6.6 to 30V
4.9
5
5.1
V
0.5
10
mV
IO = 0 mA, VI = 6.6 to 20V
1
10
mV
IO = 0 to 3A, TJ = 25°C
5
10
mV
IO = 0 to 3A
10
35
mV
VO
Output voltage (1)
ΔVO
Line regulation
ΔVO
Load regulation
Vd
Dropout voltage
IO = 3A
1.3
1.5
V
Iq
Quiescent current
VI ≤30V
5
10
mA
Isc
Short circuit current
SVR
eN
IO = 0 mA, VI = 6.6 to 20V, TJ = 25°C
VI - VO = 5V
3.2
4.5
A
VI - VO = 25V
0.2
0.5
A
Thermal regulation
TA = 25°C, 30ms pulse
Supply voltage rejection
f = 120 Hz, CO = 25µF, IO = 3A
VI = 10 ± 3V
RMS output noise voltage (% of
TA = 25°C, f =10Hz to 10kHz
VO)
S
Temperature stability
S
Long term stability
TA = 125°C, 1000Hrs
0.008
60
0.04
%/W
72
dB
0.003
%
0.5
%
0.5
%
1. See short-circuit current curve for available output current at fixed dropout.
11/27
Electrical characteristics
Table 9.
Symbol
VO
ΔVO
LD1085xx
Electrical characteristics of LD1085#
(VI = 4.25 V, CI = CO =10 µF, TA = -40 to 125 °C, unless otherwise specified).
Parameter
Test condition
Output voltage (1)
Line regulation
Min.
Typ.
Max.
Unit
IO = 10mA TJ = 25°C
1.237
1.25
1.263
V
IO = 10mA to 3A, VI = 2.85 to 30V
1.225
1.25
1.275
V
IO = 10mA, VI = 2.85 to 16.5V,
TJ = 25°C
0.015
0.2
%
IO = 10mA, VI = 2.85 to 16.5V
0.035
0.2
%
IO = 10mA to 3A, TJ = 25°C
0.1
0.3
%
IO = 0 to 3A
0.2
0.4
%
ΔVO
Load regulation
Vd
Dropout voltage
IO = 3A
1.3
1.5
V
Minimum load current
VI = 30V
3
10
mA
IO(min)
Isc
Short circuit current
VI - VO = 5V
5.5
6.5
A
VI - VO = 25V
0.5
0.7
A
Thermal regulation
TA = 25°C, 30ms pulse
SVR
Supply voltage rejection
f = 120 Hz, CO = 25µF,CADJ = 25 µF,
IO = 3A, VI = 6.25 ± 3V
IADJ
Adjust pin current
ΔIADJ
eN
Adjust pin current change
(1)
Temperature stability
S
Long term stability
72
dB
55
120
μA
IO = 10mA to 3A, VI = 2.85 to 16.5V
0.2
5
μA
TA = 125°C, 1000Hrs
1. See short-circuit current curve for available output current at fixed dropout.
12/27
60
%/W
VI = 4.25V, IO = 10 mA
RMS output noise voltage (% of
TA = 25°C, f =10Hz to 10kHz
VO)
S
0.003 0.015
0.003
%
0.5
%
0.5
%
LD1085xx
Typical application
6
Typical application
Figure 4.
(Unless otherwise specified TJ = 25 °C, CI = CO = 10 µF)
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
7
Package mechanical data
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
Dim.
mm.
Min.
Typ.
inch.
Max.
Min.
Typ.
Max.
A
4.40
4.60
0.173
0.181
C
1.23
1.32
0.048
0.051
D
2.40
2.72
0.094
0.107
0.70
0.019
0.027
D1
E
1.27
0.49
0.050
F
0.61
0.88
0.024
0.034
F1
1.14
1.70
0.044
0.067
F2
1.14
1.70
0.044
0.067
G
4.95
5.15
0.194
0.203
G1
2.4
2.7
0.094
0.106
H2
10.0
10.40
0.393
0.409
L2
16.4
0.645
L4
13.0
14.0
0.511
0.551
L5
2.65
2.95
0.104
0.116
L6
15.25
15.75
0.600
0.620
L7
6.2
6.6
0.244
0.260
L9
3.5
3.93
0.137
0.154
DIA.
3.75
3.85
0.147
0.151
P011C
18/27
LD1085xx
Package mechanical data
TO-220FP mechanical data
Dim.
mm.
Min.
Max.
Min.
A
4.40
4.60
0.173
0.181
B
2.5
2.7
0.098
0.106
D
2.5
2.75
0.098
0.108
E
0.45
0.70
0.017
0.027
F
0.75
1
0.030
0.039
F1
1.15
1.50
0.045
0.059
F2
1.15
1.50
0.045
0.059
G
4.95
5.2
0.194
0.204
G1
2.4
2.7
0.094
0.106
H
10.0
10.40
0.393
0.409
L2
Typ
inch.
16
Typ.
Max.
0.630
L3
28.6
30.6
1.126
1.204
L4
9.8
10.6
0.385
0.417
L5
2.9
3.6
0.114
0.142
L6
15.9
16.4
0.626
0.645
L7
9
9.3
0.354
0.366
DIA.
3
3.2
0.118
0.126
7012510A-H
19/27
Package mechanical data
LD1085xx
DPAK mechanical data
mm.
inch.
Dim.
Min.
A
A1
A2
B
b4
C
C2
D
D1
E
E1
e
e1
H
L
(L1)
L2
L4
R
V2
Typ.
2.2
0.9
0.03
0.64
5.2
0.45
0.48
6
Max.
Min.
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
6.6
0.252
5.1
6.4
0.260
0.173
0.368
0.039
2.8
0.8
0.181
0.397
0.110
0.031
1
0.023
0.2
0°
0.094
0.043
0.009
0.035
0.212
0.023
0.023
0.244
0.185
0.090
4.6
10.1
0.6
Max.
0.200
4.7
2.28
4.4
9.35
1
Typ.
0.039
0.008
8°
0°
8°
0068772-F
20/27
LD1085xx
Package mechanical data
D2PAK mechanical data
mm.
inch.
Dim.
Min.
Typ.
Max.
Min.
Typ.
Max.
A
4.4
4.6
0.173
0.181
A1
2.49
2.69
0.098
0.106
A2
0.03
0.23
0.001
0.009
B
0.7
0.93
0.027
0.036
B2
1.14
1.7
0.044
0.067
C
0.45
0.6
0.017
0.023
C2
1.23
1.36
0.048
0.053
D
8.95
9.35
0.352
0.368
10.4
0.393
D1
E
8
10
E1
0.315
8.5
0.409
0.335
G
4.88
5.28
0.192
0.208
L
15
15.85
0.590
0.624
L2
1.27
1.4
0.050
0.055
L3
1.4
1.75
0.055
0.068
M
2.4
3.2
0.094
R
V2
0.4
0°
0.126
0.016
8°
0°
8°
P011P6G
21/27
Package mechanical data
LD1085xx
D2PAK/A mechanical data
mm.
inch.
Dim.
Min.
Typ.
Max.
Min.
Typ.
Max.
A
4.40
4.60
0.173
0.181
A1
2.49
2.69
0.098
0.106
A2
0.03
0.23
0.001
0.009
B
0.7
0.93
0.028
0.037
B1
0.8
1.3
0.031
0.051
B2
1.14
1.7
0.045
0.067
C
0.45
0.60
0.018
0.024
C2
1.23
1.36
0.048
0.054
D
8.95
9.35
0.352
0.368
10.4
0.394
D1
E
8
10
E1
0.315
8.5
0.409
0.335
G
4.88
5.28
0.192
0.208
L
15
15.85
0.591
0.624
L2
1.27
1.4
0.050
0.055
M
2.4
3.2
0.094
R
V2
0.4
0°
0.126
0.016
8°
0°
8°
7106164/D
22/27
LD1085xx
Package mechanical data
Tape & reel DPAK-PPAK mechanical data
mm.
inch.
Dim.
Min.
Typ.
A
Max.
Min.
Typ.
330
13.0
12.992
C
12.8
D
20.2
0.795
N
60
2.362
T
13.2
Max.
0.504
0.512
22.4
0.519
0.882
Ao
6.80
6.90
7.00
0.268
0.272
0.2.76
Bo
10.40
10.50
10.60
0.409
0.413
0.417
Ko
2.55
2.65
2.75
0.100
0.104
0.105
Po
3.9
4.0
4.1
0.153
0.157
0.161
P
7.9
8.0
8.1
0.311
0.315
0.319
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Package mechanical data
LD1085xx
Tape & reel D2PAK-P2PAK-D2PAK/A-P2PAK/A mechanical data
mm.
inch.
Dim.
Min.
Typ.
A
Min.
Typ.
180
13.0
13.2
Max.
7.086
C
12.8
D
20.2
0.795
N
60
2.362
T
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Max.
0.504
0.512
14.4
0.519
0.567
Ao
10.50
10.6
10.70
0.413
0.417
0.421
Bo
15.70
15.80
15.90
0.618
0.622
0.626
Ko
4.80
4.90
5.00
0.189
0.193
0.197
Po
3.9
4.0
4.1
0.153
0.157
0.161
P
11.9
12.0
12.1
0.468
0.472
0.476
LD1085xx
Order codes
8
Order codes
Table 10.
Order codes
Packages
TO-220
TO-220FP
D2
PAK
DPAK (T&R)
2
D PAK/A
2
D PAK/A (T&R)
LD1085DT15R
LD1085V18
LD1085D2T18R
LD1085V25
LD1085V33
LD1085D2T33R
1.5 V
LD1085DT18R
LD1085D2M18R
1.8 V
LD1085DT25R
LD1085D2M25R
2.5 V
LD1085DT33R
LD1085D2M33R
3.3 V
LD1085V50
LD1085V
Output
voltage
5.0 V
LD1085P
LD1085D2T-R
LD1085D2M
LD1085D2M-R
ADJ
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Revision history
LD1085xx
9
Revision history
Table 11.
Document revision history
Date
Revision
07-Oct-2004
12
Mistake order codes - Table 1.
08-Feb-2005
13
Mistake U.M. load regulation - V ==> mV.
01-Mar-2005
14
Version 1.2 V removed.
22-May-2006
15
Order codes updated.
10-Nov-2006
16
Add package DPAK, typo on VO test value in tables 3, 4 and 11.
04-Apr-2007
17
Order codes updated.
07-Jun-2007
18
Order codes updated.
05-Dec-2007
19
Modified: Table 10.
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Changes
LD1085xx
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