STMICROELECTRONICS LD1085CDT-R

LD1085CXX
3 A low-drop, adjustable positive voltage regulator
Features
■
Typical dropout 1.3 V (at 3 A)
■
Three terminal adjustable output voltage
■
Guaranteed output current up to 3 A
■
Output tolerance ± 2 % at 25 °C and ± 3 % in
full temperature range
■
Internal power and thermal limit
■
Wide operating temperature range -40 °C to
125 °C
■
Package available: DPAK
■
Pinout compatibility with standard adjustable
VREG
DPAK
Description
The LD1085C is a low drop voltage regulator able
to provide up to 3 A of output current. Dropout is
guaranteed at a maximum of 1.5 V at the
maximum output current, decreasing at lower
loads. The LD1085C 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 LD1085C quiescent current flows into
the load, so increase efficiency. Only a 10 µF
minimum capacitor is need for stability.
The device is supplied in DPAK. On chip trimming
allows the regulator to reach a very tight output
voltage tolerance, within ± 2 % at 25 °C.
Table 1.
April 2008
Device summary
Order codes
Packages
LD1085CDT-R
DPAK (tape and reel)
Rev 8
1/16
www.st.com
16
Contents
LD1085CXX
Contents
1
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
8
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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LD1085CXX
Diagram
1
Diagram
Figure 1.
Schematic diagram
3/16
Pin configuration
2
Pin configuration
Figure 2.
Pin connections (top view)
LD1085CXX
DPAK
4/16
LD1085CXX
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
PD
Power dissipation
Internally limited
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
RthJC
Thermal resistance junction-case
RthJA
Thermal resistance junction-ambient
DPAK
Unit
3
°C/W
62.5
°C/W
5/16
Schematic application
4
Schematic application
Figure 3.
Application circuit
LD1085CXX
R
V O = V REF ⋅ ⎛⎝ 1 + ------2-⎞⎠
R1
6/16
LD1085CXX
Electrical characteristics
5
Electrical characteristics
Table 4.
Electrical characteristics of LD1085CDT
(VI = 4.25 V, CI = CO =10 µF, TA = -40 to 125 °C, unless otherwise specified).
Symbol
VO
ΔVO
Parameter
Output voltage (1)
Test condition
Min.
Typ.
Max.
Unit
1.225
1.25
1.275
V
1.213
1.25
1.288
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 5A, TJ = 25°C
0.1
0.3
%
IO = 0 to 5A
0.2
0.4
%
IO = 10mA TJ = 25°C
IO = 10mA to 3A, VI = 2.85 to 30V
Line regulation
(1)
ΔVO
Load regulation
Vd
Dropout voltage
IO = 5A
1.3
1.5
V
Minimum load current
VI = 30V
3
10
mA
IO(min)
Isc
Short circuit current
VI - VO = 5V
3.2
4.5
A
VI - VO = 25V
0.2
0.5
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
VI = 4.25V, IO = 10 mA
55
120
µA
ΔIADJ
Adjust pin current change
IO = 10mA to 3A, VI = 2.75 to 16.5V (1)
0.2
5
µA
eN
RMS output noise voltage
(% of VO)
TA = 25°C, f =10Hz to 10kHz
S
Temperature stability
S
Long term stability
TA = 125°C, 1000Hrs
0.003 0.015
60
75
%/W
dB
0.003
%
0.5
%
0.5
%
1. See short-circuit current curve for available output current at fixed dropout.
7/16
Typical application
LD1085CXX
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
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LD1085CXX
Typical application
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
9/16
Typical application
LD1085CXX
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
10/16
LD1085CXX
Typical application
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
11/16
Package mechanical data
7
LD1085CXX
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.
12/16
LD1085CXX
Package mechanical data
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
13/16
Package mechanical data
LD1085CXX
Tape & reel DPAK-PPAK mechanical data
mm.
inch.
Dim.
Min.
Typ.
A
Min.
Typ.
330
13.0
13.2
Max.
12.992
C
12.8
D
20.2
0.795
N
60
2.362
T
14/16
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
LD1085CXX
Revision history
8
Revision history
Table 5.
Document revision history
Date
Revision
Changes
07-Oct-2004
6
Mistake in Table 1.
03-Jul-2007
7
Order codes updated.
09-Apr-2008
8
Modified: Table 1 on page 1.
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LD1085CXX
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