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LD1085 series
3A Low drop positive voltage regulator adjustable and fixed
Features

Typical dropout 1.3V (at 3A) Three terminal adjustable or fixed output voltage 1.5V, 1.8V, 2.5V, 3.3V, 5V, 12V. Guaranteed output current up to 3A Output tolerance 1% at 25C and 2% in full temperature range Internal power and thermal limit Wide operating temperature range -40C to 125C Package available: TO-220, TO-220FP, DPAK, D2PAK, D2PAK/A Pinout compatibility with standard adjustable VREG
DPAK D2PAK D2PAK/A TO-220 TO-220FP
better performances in term of drop and output tolerance. A 2.85V 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 LD1085 quiescent current flows into the load, so increase efficiency. Only a 10F minimum capacitor is need for stability. 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 25C.
Description
The LD1085 is a LOW DROP Voltage Regulator able to provide up to 3A of Output Current. Dropout is guaranteed at a maximum of 1.2V at the maximum output current, decreasing at lower loads. The LD1085 is pin to pin compatible with the older 3-terminal adjustable regulators, but has
Schematic diagram
June 2007
Rev. 18
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LD1085 series
Contents
1 2 3 4 5 6 7 8 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
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LD1085 series
Pin configuration
1
Figure 1.
Pin configuration
Pin connections (top view)
TO-220
TO-220FP
D2PAK
D2PAK/A
DPAK
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Maximum ratings
LD1085 series
2
Table 1.
Maximum ratings
Absolute maximum ratings
Parameter DC Input voltage Output current Power dissipation Storage temperature range Operating junction temperature range Value 30 Internally Limited Internally Limited -55 to +150 -40 to +125 Unit V mA mW C C
Symbol VI IO PD TSTG TOP
Note:
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied Thermal Data
Parameter Thermal resistance junction-case Thermal resistance junction-ambient TO-220 3 50 DPAK 8 100 D2PAK D2PAK/A 3 62.5 Unit C/W C/W
Table 2.
Symbol RthJC RthJA
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LD1085 series
Schematic application
3
Figure 2.
Schematic application
Application circuit
R2 V O = V REF 1 + ------ R
1
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Electrical characteristics
LD1085 series
4
Table 3.
Symbol VO VO VO Vd Iq Isc
Electrical characteristics
Electrical characteristics of LD1085#15 (VI=4.5V, CI = CO =10F, TA = -40 to 125C, unless otherwise specified).
Parameter Output voltage (1) Test IO = 0 mA, TJ = 25C IO = 0 to 3A, VI = 3.1 to 30V Line Regulation IO = 0 mA, VI = 3.1 to 18V, TJ = 25C IO = 0 mA, VI = 3.1 to 15V Load Regulation Dropout Voltage Quiescent Current Short Circuit Current Thermal Regulation SVR eN S S Supply Voltage Rejection RMS Output Noise Voltage (% of VO) Temperature Stability Long Term Stability TA = 125C, 1000Hrs IO = 0 to 3A, TJ = 25C IO = 0 to 3A IO =3 A VI 30V VI - VO = 5V VI - VO = 25V TA = 25C, 30ms pulse f = 120 Hz, CO = 25F, IO = 3A VI = 7.5 3V TA = 25C, f =10Hz to 10KHz 60 3.2 0.2 Min. 1.485 1.47 Typ. 1.5 1.5 0.2 0.4 2 4 1.3 5 4.5 0.5 0.008 72 0.003 0.5 0.5 0.04 Max. 1.515 1.53 4 4 10 20 1.5 10 Unit V V mV mV mV mV V mA A A %/W dB % % %
1. See short-circuit current curve for available output current at fixed dropout.
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LD1085 series Table 4.
Symbol VO VO VO Vd Iq Isc
Electrical characteristics
Electrical characteristics of LD1085#18 (VI=4.8V, CI = CO =10F, TA = -40 to 125C, unless otherwise specified).
Parameter Output voltage (1) Test IO = 0 mA, TJ = 25C IO = 0 to 3A, VI = 3.4 to 30V Line Regulation IO = 0 mA, VI = 3.4 to 18V TJ = 25C IO = 0 mA, VI = 3.4 to 15V Load Regulation Dropout Voltage Quiescent Current Short Circuit Current Thermal Regulation IO = 0 to 3A, TJ = 25C IO = 0 to 3A IO = 3 A VI 30V VI - VO = 5V VI - VO = 25V TA = 25C, 30ms pulse f = 120 Hz, CO = 25F, IO = 3A VI = 7.5 3V TA = 25C, f =10Hz to 10KHz 60 3.2 0.2 Min. 1.782 1.764 Typ. 1.8 1.8 0.2 0.4 2 4 1.3 5 4.5 0.5 0.008 72 0.003 0.5 TA = 125C, 1000Hrs 0.5 0.04 Max. 1.818 1.836 4 4 10 20 1.5 10 Unit V V mV mV mV mV V mA A A %/W dB % % %
SVR eN S S
Supply Voltage Rejection RMS Output Noise Voltage (% of VO) Temperature Stability Long Term Stability
1. See short-circuit current curve for available output current at fixed dropout.
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Electrical characteristics
LD1085 series
Table 5.
Symbol VO VO VO Vd Iq Isc
Electrical characteristics of LD1085#25 (VI=5.5V, CI = CO =10F, TA = -40 to 125C, unless otherwise specified).
Parameter Output voltage (1) Test IO = 0 mA, TJ = 25C IO = 0 to 3A, VI = 4.1 to 30V Line regulation IO = 0 mA, VI = 4.1 to 18V, TJ = 25C IO = 0 mA, VI = 4.1 to 18V Load regulation Dropout voltage Quiescent current Short circuit current Thermal regulation IO = 0 to 3A, TJ = 25C IO = 0 to 3A IO = 3A VI 30V VI - VO = 5V VI - VO = 25V TA = 25C, 30ms pulse f = 120 Hz, CO = 25F, IO = 3A VI = 7.5 3V 60 3.2 0.2 Min. 2.475 2.45 Typ. 2.5 2.5 0.2 0.4 2 4 1.3 5 4.5 0.5 0.008 72 0.003 0.5 TA = 125C, 1000Hrs 0.5 0.04 Max. 2.525 2.55 4 4 10 20 1.5 10 Unit V V mV mV mV mV V mA A A %/W dB % % %
SVR eN S S
Supply voltage rejection
RMS Output noise voltage (% of TA = 25C, f =10Hz to 10KHz VO) Temperature stability Long term stability
1. See short-circuit current curve for available output current at fixed dropout.
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LD1085 series
Electrical characteristics
Table 6.
Symbol VO VO VO Vd Iq Isc
Electrical characteristics of LD1085#33 (VI=6.3V, CI = CO =10F, TA = -40 to 125C, unless otherwise specified).
Parameter Output voltage (1) Test IO = 0 mA, TJ = 25C IO = 0 to 3A, VI = 4.9 to 30V Line regulation IO = 0 mA, VI = 4.9 to 18V, TJ = 25C IO = 0 mA, VI = 4.9 to 18V Load regulation Dropout voltage Quiescent current Short circuit current Thermal regulation IO = 0 to 3A, TJ = 25C IO = 0 to 3A IO = 3A VI 30V VI - VO = 5V VI - VO = 25V TA = 25C, 30ms pulse f = 120 Hz, CO = 25F, IO = 3A VI = 8.3 3V 60 3.2 0.2 Min. 3.267 3.234 Typ. 3.3 3.35 0.5 1 3 7 1.3 5 4.5 0.5 0.008 72 0.003 0.5 TA = 125C, 1000Hrs 0.5 0.04 Max. 3.333 3.366 6 6 15 20 1.5 10 Unit V V mV mV mV mV V mA A A %/W dB % % %
SVR eN S S
Supply voltage rejection
RMS Output noise voltage (% of TA = 25C, f =10Hz to 10KHz VO) Temperature stability Long term stability
1. See short-circuit current curve for available output current at fixed dropout.
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Electrical characteristics
LD1085 series
Table 7.
Symbol VO VO VO Vd Iq Isc
Electrical characteristics of LD1085#50 (VI=8V, CI = CO =10F, TA = -40 to 125C, unless otherwise specified).
Parameter Output voltage (1) Test IO = 0 mA, TJ = 25C IO = 0 to 3A, VI = 6.6 to 30V Line regulation IO = 0 mA, VI = 6.6 to 20V, TJ = 25C IO = 0 mA, VI = 6.6 to 20V Load regulation Dropout voltage Quiescent current Short circuit current Thermal regulation IO = 0 to 3A, TJ = 25C IO = 0 to 3A IO = 3A VI 30V VI - VO = 5V VI - VO = 25V TA = 25C, 30ms pulse f = 120 Hz, CO = 25F, IO = 3A VI = 10 3V 60 3.2 0.2 Min. 4.95 4.9 Typ. 5 5 0.5 1 5 10 1.3 5 4.5 0.5 0.008 72 0.003 0.5 TA = 125C, 1000Hrs 0.5 0.04 Max. 5.05 5.1 10 10 10 35 1.5 10 Unit V V mV mV mV mV V mA A A %/W dB % % %
SVR eN S S
Supply voltage rejection
RMS Output noise voltage (% of TA = 25C, f =10Hz to 10KHz VO) Temperature stability Long term stability
1. See short-circuit current curve for available output current at fixed dropout.
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LD1085 series
Electrical characteristics
Table 8.
Symbol VO
Electrical characteristics of LD1085#12 (VI=15V, CI = CO =10F, TA = -40 to 125C, unless otherwise specified).
Parameter Output voltage (1) Test IO = 0 mA, TJ = 25C IO = 0 to 3A, VI = 13.8 to 30V Line regulation IO = 0 mA, VI = 13.8 to 25V, TJ = 25C IO = 0 mA, VI = 13.8 to 25V Min. 11.88 11.76 Typ. 12 12 1 2 12 24 1.3 5 3.2 0.2 4.5 0.5 0.008 54 66 0.003 0.5 TA = 125C, 1000Hrs 0.5 0.04 Max. 12.12 12.24 25 25 36 72 1.5 10 Unit V V mV mV mV mV V mA A A %/W dB % % %
VO
VO Vd Iq Isc
Load regulation Dropout voltage Quiescent current Short circuit current Thermal regulation
IO = 0 to 3A, TJ = 25C IO = 0 to 3A IO = 3A VI 30V VI - VO = 5V VI - VO = 25V TA = 25C, 30ms pulse f = 120 Hz, CO = 25F, IO = 3A VI = 17 3V
SVR eN S S
Supply voltage rejection
RMS Output noise voltage (% of TA = 25C, f =10Hz to 10KHz VO) Temperature stability Long term stability
1. See short-circuit current curve for available output current at fixed dropout.
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Electrical characteristics
LD1085 series
Table 9.
Symbol VO
Electrical characteristics of LD1085# (VI=4.25V, CI = CO =10F, TA = -40 to 125C, unless otherwise specified).
Parameter Output voltage (1) Test IO = 10mA TJ = 25C IO = 10mA to 3A, VI = 2.85 to 30V Line Regulation IO = 10mA, VI = 2.85 to 16.5V, TJ = 25C IO = 10mA, VI = 2.85 to 16.5V Min. 1.237 1.225 Typ. 1.25 1.25 0.015 0.035 0.1 0.2 1.3 3 5.5 0.5 6.5 0.7 0.003 0.015 60 72 55 0.2 0.003 0.5 TA = 125C, 1000Hrs 0.5 120 5 Max. 1.263 1.275 0.2 0.2 0.3 0.4 1.5 10 Unit V V % % % % V mA A A %/W dB A A % % %
VO
VO Vd IO(min) Isc
Load Regulation Dropout Voltage Minimum Load Current Short Circuit Current Thermal Regulation
IO = 10mA to 3A, TJ = 25C IO = 0 to 3A IO = 3A VI = 30V VI - VO = 5V VI - VO = 25V TA = 25C, 30ms pulse f = 120 Hz, CO = 25F,CADJ = 25 F, IO = 3A, VI = 6.25 3V VI = 4.25V, IO = 10 mA
(1)
SVR IADJ IADJ eN S S
Supply Voltage Rejection Adjust Pin Current Adjust Pin Current Change
IO = 10mA to 3A, VI = 2.85 to 16.5V TA = 25C, f =10Hz to 10KHz
RMS Output Noise Voltage (% of VO) Temperature Stability Long Term Stability
1. See short-circuit current curve for available output current at fixed dropout.
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LD1085 series
Typical application
5
Figure 3.
Typical application
(Unless otherwise specified TJ = 25C, CI = CO = 10F) Output voltage vs temperature Figure 4. Output voltage vs temperature
Figure 5.
Output voltage vs temperature
Figure 6.
Short circuit current vs dropout voltage
Figure 7.
Line regulation vs temperature
Figure 8.
Load regulation vs temperature
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Typical application
LD1085 series
Figure 9.
Dropout voltage vs temperature
Figure 10. Dropout voltage vs output current
Figure 11. Adjust pin current vs temperature
Figure 12. Quiescent current vs temperature
Figure 13. Line regulation vs temperature
Figure 14. Supply voltage rejection vs output current
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LD1085 series
Typical application
Figure 15. Supply voltage rejection vs frequency
Figure 16. Supply voltage rejection vs temperature
Figure 17. Minimum load current vs temperature
Figure 18. Stability
Figure 19. Stability
Figure 20. Line transient
VI=12 to 13V, IO=200mA, CI = 1F(tant), CO=10F(tant), CADJ=1F
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Typical application Figure 21. Line transient Figure 22. Load transient
LD1085 series
VI=12 to 13V, IO=200mA, CI = 1F(tant), CO=10F(tant), CADJ=1F
VI=12V, IO=0.12 to 3A, CI = 1F(tant), CO=10F(tant), CADJ=1F
Figure 23. Load transient
VI=12V, IO=0.12 to 3A, CI = 1F(tant), CO=10F(tant), CADJ=1F
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LD1085 series
Package mechanical data
6
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) 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.
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Package mechanical data
LD1085 series
TO-220 MECHANICAL DATA
DIM. A C D D1 E F F1 F2 G G1 H2 L2 L4 L5 L6 L7 L9 DIA. 13.0 2.65 15.25 6.2 3.5 3.75 0.49 0.61 1.14 1.14 4.95 2.4 10.0 16.4 14.0 2.95 15.75 6.6 3.93 3.85 0.511 0.104 0.600 0.244 0.137 0.147 mm. MIN. 4.40 1.23 2.40 1.27 0.70 0.88 1.70 1.70 5.15 2.7 10.40 0.019 0.024 0.044 0.044 0.194 0.094 0.393 0.645 0.551 0.116 0.620 0.260 0.154 0.151 TYP MAX. 4.60 1.32 2.72 MIN. 0.173 0.048 0.094 0.050 0.027 0.034 0.067 0.067 0.203 0.106 0.409 inch TYP. MAX. 0.181 0.051 0.107
P011C
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LD1085 series
Package mechanical data
TO-220FP MECHANICAL DATA
mm. DIM. A B D E F F1 F2 G G1 H L2 L3 L4 L5 L6 L7 DIA. 28.6 9.8 2.9 15.9 9 3 MIN. 4.40 2.5 2.5 0.45 0.75 1.15 1.15 4.95 2.4 10.0 16 30.6 10.6 3.6 16.4 9.3 3.2 1.126 0.385 0.114 0.626 0.354 0.118 TYP MAX. 4.60 2.7 2.75 0.70 1 1.50 1.50 5.2 2.7 10.40 MIN. 0.173 0.098 0.098 0.017 0.030 0.045 0.045 0.194 0.094 0.393 0.630 1.204 0.417 0.142 0.645 0.366 0.126 inch TYP. MAX. 0.181 0.106 0.108 0.027 0.039 0.059 0.059 0.204 0.106 0.409
7012510A-H
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Package mechanical data
LD1085 series
DPAK MECHANICAL DATA
mm. DIM. MIN. A A1 A2 B b4 C C2 D D1 E E1 e e1 H L (L1) L2 L4 R V2 2.2 0.9 0.03 0.64 5.2 0.45 0.48 6 5.1 6.4 4.7 2.28 4.4 9.35 1 2.8 0.8 0.6 0.2 0 8 0 1 0.023 0.008 8 4.6 10.1 0.173 0.368 0.039 0.110 0.031 0.039 6.6 0.252 0.185 0.090 0.181 0.397 TYP MAX. 2.4 1.1 0.23 0.9 5.4 0.6 0.6 6.2 MIN. 0.086 0.035 0.001 0.025 0.204 0.017 0.019 0.236 0.200 0.260 TYP. MAX. 0.094 0.043 0.009 0.035 0.212 0.023 0.023 0.244 inch
0068772-F
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LD1085 series
Package mechanical data
D2PAK MECHANICAL DATA
mm. DIM. MIN. A A1 A2 B B2 C C2 D D1 E E1 G L L2 L3 M R V2 0 4.88 15 1.27 1.4 2.4 0.4 8 0 10 8.5 5.28 15.85 1.4 1.75 3.2 0.192 0.590 0.050 0.055 0.094 0.016 8 4.4 2.49 0.03 0.7 1.14 0.45 1.23 8.95 8 10.4 0.393 0.335 0.208 0.624 0.055 0.068 0.126 TYP MAX. 4.6 2.69 0.23 0.93 1.7 0.6 1.36 9.35 MIN. 0.173 0.098 0.001 0.027 0.044 0.017 0.048 0.352 0.315 0.409 TYP. MAX. 0.181 0.106 0.009 0.036 0.067 0.023 0.053 0.368 inch
P011P6G
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Package mechanical data
LD1085 series
D2PAK/A MECHANICAL DATA
mm. DIM. MIN. A A1 A2 B B1 B2 C C2 D D1 E E1 G L L2 M R V2 0 4.88 15 1.27 2.4 0.4 8 0 10 8.5 5.28 15.85 1.4 3.2 0.192 0.591 0.050 0.094 0.016 8 4.40 2.49 0.03 0.7 0.8 1.14 0.45 1.23 8.95 8 10.4 0.394 0.335 0.208 0.624 0.055 0.126 TYP MAX. 4.60 2.69 0.23 0.93 1.3 1.7 0.60 1.36 9.35 MIN. 0.173 0.098 0.001 0.028 0.031 0.045 0.018 0.048 0.352 0.315 0.409 TYP. MAX. 0.181 0.106 0.009 0.037 0.051 0.067 0.024 0.054 0.368 inch
7106164/D
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LD1085 series
Package mechanical data
Tape & Reel DPAK-PPAK MECHANICAL DATA
mm. DIM. MIN. A C D N T Ao Bo Ko Po P 6.80 10.40 2.55 3.9 7.9 6.90 10.50 2.65 4.0 8.0 12.8 20.2 60 22.4 7.00 10.60 2.75 4.1 8.1 0.268 0.409 0.100 0.153 0.311 0.272 0.413 0.104 0.157 0.315 13.0 TYP MAX. 330 13.2 0.504 0.795 2.362 0.882 0.2.76 0.417 0.105 0.161 0.319 0.512 MIN. TYP. MAX. 12.992 0.519 inch
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Package mechanical data
LD1085 series
Tape & Reel D2PAK-P 2PAK-D 2PAK/A-P 2PAK/A MECHANICAL DATA
mm. DIM. MIN. A C D N T Ao Bo Ko Po P 10.50 15.70 4.80 3.9 11.9 10.6 15.80 4.90 4.0 12.0 12.8 20.2 60 14.4 10.70 15.90 5.00 4.1 12.1 0.413 0.618 0.189 0.153 0.468 0.417 0.622 0.193 0.157 0.472 13.0 TYP MAX. 180 13.2 0.504 0.795 2.362 0.567 0.421 0.626 0.197 0.161 0.476 0.512 MIN. TYP. MAX. 7.086 0.519 inch
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LD1085 series
Order codes
7
Table 10.
Order codes
Order codes
Part numbers Packages TO-220 TO-220FP D2 PAK DPAK (T&R) LD1085DT15R LD1085V18 LD1085V25 LD1085V33 LD1085V50 LD1085V12 LD1085V LD1085P LD1085D2T LD1085DT-R LD1085CDT-R LD1085D2T33 LD1085DT18R LD1085DT25R LD1085DT33R LD1085D2M50 LD1085D2M12 LD1085D2M12R LD1085D2M LD1085D2M-R LD1085D2M18R LD1085D2M25R LD1085D2M33R D PAK/A
2
D PAK/A (T&R)
2
Output voltage 1.5 V 1.8 V 2.5 V 3.3 V 5.0 V 12.0 V ADJ ADJ
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Revision history
LD1085 series
8
Table 11.
Date
Revision history
Revision history
Revision 12 13 14 15 16 17 18 Mistake Order Codes - Table 1. Mistake U.M. Load Regulation - V ==> mV. Version 1.2V removed. Order Codes has been updated and new template. Add package DPAK, typo on VO test value in tables 3, 4 and 11. Order codes has been updated. Order codes has been updated. Changes
07-Oct-2004 08-Feb-2005 01-Mar-2005 22-May-2006 10-Nov-2006 04-Apr-2007 07-Jun-2007
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LD1085 series
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