Datasheet

ManualsBrandsSTMICROELECTRONICS ManualsVoltage RegulatorsLD1085D2M33R

This is information on a product in full production.

October 2013 DocID6738 Rev 27 1/27

LD1085

3 A low drop positive voltage regulator: adjustable and fixed

Datasheet

production data

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.

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.

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-220

TO-220FP

D²PAK

D²PAK/A

www.st.com

Summary of content (27 pages)

PAGE 1
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.
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Contents LD1085 Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Electrical characteristics . . . . . .
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LD1085 1 Diagram Diagram Figure 1.
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Pin configuration 2 LD1085 Pin configuration Figure 2.
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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.
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Application schematic 4 LD1085 Application schematic Figure 3.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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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.
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LD1085 Package mechanical data Figure 24.
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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.
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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.
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Package mechanical data LD1085 Figure 26.
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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.
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Package mechanical data LD1085 Figure 27.
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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.
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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.
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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.
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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.
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LD1085 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.