LD1085
3 A low drop positive voltage regulator: adjustable and fixed
Datasheet - production data
Unlike PNP regulators, where a part of the output
current is wasted as quiescent current, the
LD1085 quiescent current flows into the load,
thus increase efficiency. Only a 10 µF minimum
capacitor is need for stability.
TO-220
D²PAK
The device is supplied in TO-220, TO-220FP,
D²PAK and D²PAK/A packages. On-chip trimming
allows the regulator to reach a very tight output
voltage tolerance, within ± 1% at 25 °C.
TO-220FP
D²PAK/A
Features
• Typical dropout 1.3 V (at 3 A)
• Three terminal adjustable or fixed output
voltage 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,
D²PAK, D²PAK/A
• Pinout compatibility with standard adjustable
VREG
Description
The LD1085 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 LD1085 is pin-to-pin compatible with
the older 3-terminal adjustable regulators, but
offers better performance in terms of drop and
output tolerance.
October 2013
This is information on a product in full production.
DocID6738 Rev 27
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www.st.com
27
Contents
LD1085
Contents
1
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6
Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8
Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
9
Order codes
10
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
2/27
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
DocID6738 Rev 27
LD1085
1
Diagram
Diagram
Figure 1. Schematic diagram
DocID6738 Rev 27
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Pin configuration
2
LD1085
Pin configuration
Figure 2. Pin connections (top view)
TO-220
TO-220FP
D²PAK
4/27
D²PAK/A
DocID6738 Rev 27
LD1085
Maximum ratings
3
Maximum ratings
Table 1. 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 2. Thermal data
Symbol
Parameter
TO-220
TO-220FP
D²PAK
D²PAK/A
Unit
RthJC
Thermal resistance junction-case
3
5
3
°C/W
RthJA
Thermal resistance junction-ambient
50
60
62.5
°C/W
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Application schematic
4
LD1085
Application schematic
Figure 3. Application circuit
R2
VO = V REF ⋅ 1 + -------
R 1
6/27
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LD1085
5
Electrical characteristics
Electrical characteristics
VI = 4.8 V, CI = CO =10 µF, TA = -40 to 125 °C, unless otherwise specified.
Table 3. Electrical characteristics of LD1085#18
Symbol
VO
Parameter
Output voltage (1)
Test condition
Min.
Typ.
Max.
Unit
IO = 0 mA, TJ = 25°C
1.782
1.8
1.818
V
IO = 0 to 3 A, VI = 3.4 to 30 V
1.764
1.8
1.836
V
IO = 0 mA, VI = 3.4 to 18 V TJ = 25°C
0.2
4
mV
IO = 0 mA, VI = 3.4 to 15 V
0.4
4
mV
IO = 0 to 3 A, TJ = 25°C
2
10
mV
IO = 0 to 3 A
4
20
mV
ΔVO
Line regulation
ΔVO
Load regulation
Vd
Dropout voltage
IO = 3 A
1.3
1.5
V
Iq
Quiescent current
VI ≤ 30 V
5
10
mA
Isc
Short-circuit current
SVR
VI - VO = 5 V
3.2
4.5
A
VI - VO = 25 V
0.2
0.5
A
Thermal regulation
TA = 25°C, 30 ms pulse
Supply voltage rejection
f = 120 Hz, CO = 25 µF, IO = 3 A
VI = 7.5 ± 3 V
eN
RMS output noise voltage (% of
TA = 25°C, f =10 Hz to 10 kHz
VO)
S
Temperature stability
S
Long term stability
TA = 125°C, 1000 Hrs
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.
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Electrical characteristics
LD1085
VI = 5.5 V, CI = CO =10 µF, TA = -40 to 125 °C, unless otherwise specified.
Table 4. Electrical characteristics of LD1085#25
Symbol
VO
Parameter
Output voltage (1)
Test condition
Min.
Typ.
Max.
Unit
IO = 0 mA, TJ = 25°C
2.475
2.5
2.525
V
IO = 0 to 3 A, VI = 4.1 to 30 V
2.45
2.5
2.55
V
IO = 0 mA, VI = 4.1 to 18 V, TJ = 25°C
0.2
4
mV
IO = 0 mA, VI = 4.1 to 18 V
0.4
4
mV
IO = 0 to 3 A, TJ = 25°C
2
10
mV
IO = 0 to 3 A
4
20
mV
ΔVO
Line regulation
ΔVO
Load regulation
Vd
Dropout voltage
IO = 3 A
1.3
1.5
V
Iq
Quiescent current
VI ≤ 30 V
5
10
mA
Isc
Short-circuit current
VI - VO = 5 V
3.2
4.5
A
VI - VO = 25 V
0.2
0.5
A
Thermal regulation
TA = 25°C, 30ms pulse
Supply voltage rejection
f = 120 Hz, CO = 25µF, IO = 3 A
VI = 7.5 ± 3 V
eN
RMS output noise voltage (%
of VO)
TA = 25°C, f =10 Hz to 10 kHz
S
Temperature stability
S
Long term stability
SVR
TA = 125°C, 1000 Hrs
1. See short-circuit current curve for available output current at fixed dropout.
8/27
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0.008
60
0.04
%/W
72
dB
0.003
%
0.5
%
0.5
%
LD1085
Electrical characteristics
VI = 6.3 V, CI = CO =10 µF, TA = -40 to 125 °C, unless otherwise specified.
Table 5. Electrical characteristics of LD1085#33
Symbol
VO
Parameter
Output voltage (1)
Test condition
Min.
Typ.
Max.
Unit
IO = 0 mA, TJ = 25°C
3.267
3.3
3.333
V
IO = 0 to 3 A, VI = 4.9 to 30 V
3.234
3.35
3.366
V
0.5
6
mV
IO = 0 mA, VI = 4.9 to 18 V
1
6
mV
IO = 0 to 3 A, TJ = 25°C
3
15
mV
IO = 0 to 3 A
7
20
mV
IO = 0 mA, VI = 4.9 to 18 V, TJ = 25°C
ΔVO
Line regulation
ΔVO
Load regulation
Vd
Dropout voltage
IO = 3 A
1.3
1.5
V
Iq
Quiescent current
VI ≤ 30 V
5
10
mA
Isc
Short-circuit current
VI - VO = 5 V
3.2
4.5
A
VI - VO = 25 V
0.2
0.5
A
Thermal regulation
TA = 25°C, 30 ms pulse
Supply voltage rejection
f = 120 Hz, CO = 25 µF, IO = 3 A
VI = 8.3 ± 3 V
eN
RMS output noise voltage (%
of VO)
TA = 25°C, f =10 Hz to 10 kHz
S
Temperature stability
S
Long term stability
SVR
TA = 125°C, 1000 Hrs
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.
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Electrical characteristics
LD1085
VI = 8 V, CI = CO =10 µF, TA = -40 to 125 °C, unless otherwise specified.
Table 6. Electrical characteristics of LD1085#50
Symbol
VO
Parameter
Output voltage (1)
Test condition
Min.
Typ.
Max.
Unit
IO = 0 mA, TJ = 25°C
4.95
5
5.05
V
IO = 0 to 3 A, VI = 6.6 to 30 V
4.9
5
5.1
V
0.5
10
mV
IO = 0 mA, VI = 6.6 to 20 V
1
10
mV
IO = 0 to 3 A, TJ = 25°C
5
10
mV
IO = 0 to 3 A
10
35
mV
IO = 0 mA, VI = 6.6 to 20 V, TJ = 25°C
ΔVO
Line regulation
ΔVO
Load regulation
Vd
Dropout voltage
IO = 3 A
1.3
1.5
V
Iq
Quiescent current
VI ≤ 30 V
5
10
mA
Isc
Short-circuit current
VI - VO = 5 V
3.2
4.5
A
VI - VO = 25 V
0.2
0.5
A
Thermal regulation
TA = 25°C, 30 ms pulse
Supply voltage rejection
f = 120 Hz, CO = 25 µF, IO = 3 A
VI = 10 ± 3 V
eN
RMS output noise voltage (%
of VO)
TA = 25°C, f = 10 Hz to 10 kHz
S
Temperature stability
S
Long term stability
SVR
TA = 125°C, 1000 Hrs
1. See short-circuit current curve for available output current at fixed dropout.
10/27
DocID6738 Rev 27
0.008
60
0.04
%/W
72
dB
0.003
%
0.5
%
0.5
%
LD1085
Electrical characteristics
VI = 4.25 V, CI = CO =10 µF, TA = -40 to 125 °C, unless otherwise specified.
Table 7. Electrical characteristics of LD1085#
Symbol
Vref
ΔVO
Parameter
Reference voltage (1)
Line regulation
Test condition
Min.
Typ.
Max.
Unit
IO = 10 mA TJ = 25°C
1.237
1.25
1.263
V
IO = 10 mA to 3 A, VI = 2.85 to 30 V
1.225
1.25
1.275
V
IO = 10 mA, VI = 2.85 to 16.5 V,
TJ = 25°C
0.015
0.2
%
IO = 10 mA, VI = 2.85 to 16.5 V
0.035
0.2
%
IO = 10 mA to 3 A, TJ = 25°C
0.1
0.3
%
IO = 0 to 3 A
0.2
0.4
%
ΔVO
Load regulation
Vd
Dropout voltage
IO = 3 A
1.3
1.5
V
Minimum load current
VI = 30 V
3
10
mA
IO(min)
Isc
Short-circuit current
VI - VO = 5 V
5.5
6.5
A
VI - VO = 25 V
0.5
0.7
A
Thermal regulation
TA = 25°C, 30ms pulse
SVR
Supply voltage rejection
f = 120 Hz, CO = 25 µF,CADJ = 25 µF,
IO = 3 A, VI = 6.25 ± 3 V
IADJ
Adjust pin current
VI = 4.25 V, IO = 10 mA
55
120
µA
ΔIADJ
Adjust pin current change (1)
IO = 10 mA to 3 A, VI = 2.85 to 16.5 V
0.2
5
µA
eN
RMS output noise voltage (%
of VO)
TA = 25°C, f =10 Hz to 10 kHz
S
Temperature stability
S
Long term stability
TA = 125°C, 1000 Hrs
0.003 0.015
60
72
%/W
dB
0.003
%
0.5
%
0.5
%
1. See short-circuit current curve for available output current at fixed dropout.
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Typical characteristics
6
LD1085
Typical characteristics
Unless otherwise specified TJ = 25 °C, CI = CO = 10 µF.
Figure 4. Output voltage vs. temp. (IO = 3 A)
Figure 5. Output voltage vs. temp. (IO = 0 mA)
Figure 6. Output voltage vs. temp. (IO = 10 mA)
Figure 7. Short-circuit current vs. dropout
voltage
12/27
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LD1085
Typical characteristics
Figure 8. Line regulation vs. temp. (IO = 10 mA)
Figure 9. Load regulation vs. temperature
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
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Typical characteristics
LD1085
Figure 14. Line regulation vs. temperature
(VIN = 15 V)
Figure 15. Supply voltage rejection vs. output
current
Figure 16. Supply voltage rejection vs.
frequency
Figure 17. Supply voltage rejection vs.
temperature
Figure 18. Minimum load current vs.
temperature
Figure 19. Stability, VO = 1.8 V
14/27
DocID6738 Rev 27
LD1085
Typical characteristics
Figure 20. Stability, VO = 12 V
Figure 21. Line transient
VI=12 to 13V, IO=200mA, CI = 1µF(tant),
CO=10µF(tant), CADJ=1µF
Figure 22. Load transient
VI=12V, IO=0.12 to 3A, CI = 1µF(tant),
CO=10µF(tant), CADJ=1µF
Figure 23. Load transient (No CADJ)
VI=12V, IO=0.12 to 3A, CI = 1µF(tant),
CO=10µF(tant), no CADJ
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Package mechanical data
7
LD1085
Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Table 8. TO-220 mechanical data
mm
Dim.
Min.
16/27
Typ.
Max.
A
4.40
4.60
b
0.61
0.88
b1
1.14
1.70
c
0.48
0.70
D
15.25
15.75
E
10
10.40
e
2.40
2.70
e1
4.95
5.15
F
0.51
0.60
H1
6.20
6.60
J1
2.40
2.72
L
13
14
L1
3.50
3.93
L20
16.40
L30
28.90
∅P
3.75
3.85
Q
2.65
2.95
DocID6738 Rev 27
LD1085
Package mechanical data
Figure 24. TO-220 drawing
BUHY'
DocID6738 Rev 27
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Package mechanical data
LD1085
Table 9. TO-220FP mechanical data
mm
Dim.
Min.
Typ.
Max.
A
4.4
4.6
B
2.5
2.7
D
2.5
2.75
E
0.45
0.7
F
0.75
1
F1
1.15
1.70
F2
1.15
1.70
G
4.95
5.2
G1
2.4
2.7
H
10
10.4
L2
16
L3
28.6
30.6
L4
9.8
10.6
L5
2.9
3.6
L6
15.9
16.4
L7
9
9.3
Dia
3
3.2
Figure 25. TO-220FP drawing
L7
E
A
B
D
Dia
L5
L6
F1
F2
F
G
H
G1
L4
L2
L3
7012510_Rev_K
18/27
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LD1085
Package mechanical data
Table 10. D²PAK mechanical data
mm
Dim.
Min.
Typ.
Max.
A
4.40
4.60
A1
0.03
0.23
b
0.70
0.93
b2
1.14
1.70
c
0.45
0.60
c2
1.23
1.36
D
8.95
9.35
D1
7.50
E
10
E1
8.50
10.40
e
2.54
e1
4.88
5.28
H
15
15.85
J1
2.49
2.69
L
2.29
2.79
L1
1.27
1.40
L2
1.30
1.75
R
V2
0.4
0°
8°
DocID6738 Rev 27
19/27
Package mechanical data
LD1085
Figure 26. D²PAK drawing
0079457_T
20/27
DocID6738 Rev 27
LD1085
Package mechanical data
Table 11. D²PAK/A mechanical data
mm
Dim.
Min.
Typ.
Max.
A
4.40
4.60
A1
0.03
0.23
b
0.70
0.93
b2
1.14
1.70
c
0.45
0.60
c2
1.23
1.36
D
8.95
9.35
D1
7.50
E
10
E1
8.50
10.40
e
2.54
e1
4.88
5.28
H
15
15.85
J1
2.49
2.69
L
2.29
2.79
L1
1.27
1.40
R
V2
0.4
0°
8°
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21/27
Package mechanical data
LD1085
Figure 27. D²PAK/A mechanical data
7106164_E
22/27
DocID6738 Rev 27
LD1085
8
Packaging mechanical data
Packaging mechanical data
Table 12. D²PAK, D²PAK/A tape and reel mechanical data
Tape
Reel
mm
mm
Dim.
Dim.
Min.
Max.
Min.
Max.
A0
10.5
10.7
A
B0
15.7
15.9
B
1.5
D
1.5
1.6
C
12.8
D1
1.59
1.61
D
20.2
E
1.65
1.85
G
24.4
F
11.4
11.6
N
100
K0
4.8
5.0
T
P0
3.9
4.1
P1
11.9
12.1
Base qty
1000
P2
1.9
2.1
Bulk qty
1000
R
50
T
0.25
0.35
W
23.7
24.3
330
13.2
26.4
30.4
Figure 28. D²PAK, D²PAK/A footprint(a)
16.90
12.20
5.08
1.60
3.50
9.75
Footprint
a. All dimensions are in millimeters
DocID6738 Rev 27
23/27
Packaging mechanical data
LD1085
Figure 29. Tape for D²PAK and D²PAK/A
10 pitches cumulative
tolerance on tape +/- 0.2 mm
T
P0
Top cover
tape
P2
D
E
F
B1
W
K0
B0
For machine ref. only
including draft and
radii concentric around B0
A0
P1
D1
User direction of feed
R
Bending radius
User direction of feed
AM08852v1
Figure 30. Reel for D²PAK and D²PAK/A
T
REEL DIMENSIONS
40mm min.
Access hole
At sl ot location
B
D
C
N
A
Full radius
Tape slot
in core for
tape start 25 mm min.
width
G measured at hub
AM08851v2
24/27
DocID6738 Rev 27
LD1085
9
Order codes
Order codes
Table 13. Order codes
Packages
TO-220
TO-220FP
D²PAK
LD1085D2T33R
D²PAK/A (T&R)
LD1085D2M18R
1.8 V
LD1085D2M25R
2.5 V
LD1085D2M33R
3.3 V
LD1085V50
LD1085V
Output
voltage
5.0 V
LD1085P
LD1085D2T-R
DocID6738 Rev 27
LD1085D2M-R
ADJ
25/27
Revision history
10
LD1085
Revision history
Table 14. 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 has been updated and new template.
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 13.
29-Jan-2008
20
Added new order codes for Automotive grade products see Table 13 on
page 25.
18-Feb-2008
21
Modified: Table 13 on page 25.
09-Apr-2008
22
Modified: Table 13 on page 25.
14-Jul-2008
23
Modified: Table 13 on page 25.
22-Aug-2008
24
Modified: Table 2 on page 5.
28-Jul-2009
25
Modified: Table 13 on page 25.
18-Feb-2013
26
– Modified Output voltage in Voltage reference parameter Table 7 on page 11
and Table 8 on page 12.
– Minor text changes throughout the document.
27
RPN LD1085xx changed to LD1085.
Updated the Features and the Description in cover page.
Cancelled Table1: Device summary, Table 9: Electrical characteristics of
LD1085PY (Automotive Grade).
Modified Figure 2: Pin connections (top view), Table 2: Thermal data, Table 13:
Order codes, Section 7: Package mechanical data.
Added Section 8: Packaging mechanical data.
Minor text changes.
08-Oct-2013
26/27
Changes
DocID6738 Rev 27
LD1085
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