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. The device is supplied in TO-220, TO-220FP, D²PAK and D²PAK/A packages. On-chip trimming TO-220 TO-220FP allows the regulator to reach a very tight output voltage tolerance, within ± 1% at 25 °C. D²PAK 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 DocID6738 Rev 27 1/27 This is information on a product in full production. 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 2/27 DocID6738 Rev 27

LD1085 Diagram 1 Diagram Figure 1. Schematic diagram DocID6738 Rev 27 3/27

Pin configuration LD1085 2 Pin configuration Figure 2. Pin connections (top view) TO-220 TO-220FP D²PAK D²PAK/A 4/27 DocID6738 Rev 27

LD1085 Maximum ratings 3 Maximum ratings Table 1. Absolute maximum ratings Symbol Parameter Value Unit V DC input voltage 30 V I I Output current Internally limited mA O P Power dissipation Internally limited mW D T Storage temperature range -55 to +150 °C STG T Operating junction temperature range -40 to +125 °C OP 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 D²PAK Symbol Parameter TO-220 TO-220FP Unit D²PAK/A R Thermal resistance junction-case 3 5 3 °C/W thJC R Thermal resistance junction-ambient 50 60 62.5 °C/W thJA DocID6738 Rev 27 5/27

Application schematic LD1085 4 Application schematic Figure 3. Application circuit R V = V ⋅1+-----2-- O REF  R  1 6/27 DocID6738 Rev 27

LD1085 Electrical characteristics 5 Electrical characteristics V = 4.8 V, C = C =10 µF, T = -40 to 125 °C, unless otherwise specified. I I O A Table 3. Electrical characteristics of LD1085#18 Symbol Parameter Test condition Min. Typ. Max. Unit I = 0 mA, T = 25°C 1.782 1.8 1.818 V V Output voltage (1) O J O I = 0 to 3 A, V = 3.4 to 30 V 1.764 1.8 1.836 V O I I = 0 mA, V = 3.4 to 18 V T = 25°C 0.2 4 mV ΔV Line regulation O I J O I = 0 mA, V = 3.4 to 15 V 0.4 4 mV O I I = 0 to 3 A, T = 25°C 2 10 mV ΔV Load regulation O J O I = 0 to 3 A 4 20 mV O V Dropout voltage I = 3 A 1.3 1.5 V d O I Quiescent current V ≤ 30 V 5 10 mA q I V - V = 5 V 3.2 4.5 A I O I Short-circuit current sc V - V = 25 V 0.2 0.5 A I O Thermal regulation T = 25°C, 30 ms pulse 0.008 0.04 %/W A f = 120 Hz, C = 25 µF, I = 3 A SVR Supply voltage rejection O O 60 72 dB V = 7.5 ± 3 V I RMS output noise voltage (% of eN T = 25°C, f =10 Hz to 10 kHz 0.003 % V ) A O S Temperature stability 0.5 % S Long term stability T = 125°C, 1000 Hrs 0.5 % A 1. See short-circuit current curve for available output current at fixed dropout. DocID6738 Rev 27 7/27

Electrical characteristics LD1085 V = 5.5 V, C = C =10 µF, T = -40 to 125 °C, unless otherwise specified. I I O A Table 4. Electrical characteristics of LD1085#25 Symbol Parameter Test condition Min. Typ. Max. Unit I = 0 mA, T = 25°C 2.475 2.5 2.525 V V Output voltage (1) O J O I = 0 to 3 A, V = 4.1 to 30 V 2.45 2.5 2.55 V O I I = 0 mA, V = 4.1 to 18 V, T = 25°C 0.2 4 mV ΔV Line regulation O I J O I = 0 mA, V = 4.1 to 18 V 0.4 4 mV O I I = 0 to 3 A, T = 25°C 2 10 mV ΔV Load regulation O J O I = 0 to 3 A 4 20 mV O V Dropout voltage I = 3 A 1.3 1.5 V d O I Quiescent current V ≤ 30 V 5 10 mA q I V - V = 5 V 3.2 4.5 A I O I Short-circuit current sc V - V = 25 V 0.2 0.5 A I O Thermal regulation T = 25°C, 30ms pulse 0.008 0.04 %/W A f = 120 Hz, C = 25µF, I = 3 A SVR Supply voltage rejection O O 60 72 dB V = 7.5 ± 3 V I RMS output noise voltage (% eN T = 25°C, f =10 Hz to 10 kHz 0.003 % of V ) A O S Temperature stability 0.5 % S Long term stability T = 125°C, 1000 Hrs 0.5 % A 1. See short-circuit current curve for available output current at fixed dropout. 8/27 DocID6738 Rev 27

LD1085 Electrical characteristics V = 6.3 V, C = C =10 µF, T = -40 to 125 °C, unless otherwise specified. I I O A Table 5. Electrical characteristics of LD1085#33 Symbol Parameter Test condition Min. Typ. Max. Unit I = 0 mA, T = 25°C 3.267 3.3 3.333 V V Output voltage (1) O J O I = 0 to 3 A, V = 4.9 to 30 V 3.234 3.35 3.366 V O I I = 0 mA, V = 4.9 to 18 V, T = 25°C 0.5 6 mV ΔV Line regulation O I J O I = 0 mA, V = 4.9 to 18 V 1 6 mV O I I = 0 to 3 A, T = 25°C 3 15 mV ΔV Load regulation O J O I = 0 to 3 A 7 20 mV O V Dropout voltage I = 3 A 1.3 1.5 V d O I Quiescent current V ≤ 30 V 5 10 mA q I V - V = 5 V 3.2 4.5 A I O I Short-circuit current sc V - V = 25 V 0.2 0.5 A I O Thermal regulation T = 25°C, 30 ms pulse 0.008 0.04 %/W A f = 120 Hz, C = 25 µF, I = 3 A SVR Supply voltage rejection O O 60 72 dB V = 8.3 ± 3 V I RMS output noise voltage (% eN T = 25°C, f =10 Hz to 10 kHz 0.003 % of V ) A O S Temperature stability 0.5 % S Long term stability T = 125°C, 1000 Hrs 0.5 % A 1. See short-circuit current curve for available output current at fixed dropout. DocID6738 Rev 27 9/27

Electrical characteristics LD1085 V = 8 V, C = C =10 µF, T = -40 to 125 °C, unless otherwise specified. I I O A Table 6. Electrical characteristics of LD1085#50 Symbol Parameter Test condition Min. Typ. Max. Unit I = 0 mA, T = 25°C 4.95 5 5.05 V V Output voltage (1) O J O I = 0 to 3 A, V = 6.6 to 30 V 4.9 5 5.1 V O I I = 0 mA, V = 6.6 to 20 V, T = 25°C 0.5 10 mV ΔV Line regulation O I J O I = 0 mA, V = 6.6 to 20 V 1 10 mV O I I = 0 to 3 A, T = 25°C 5 10 mV ΔV Load regulation O J O I = 0 to 3 A 10 35 mV O V Dropout voltage I = 3 A 1.3 1.5 V d O I Quiescent current V ≤ 30 V 5 10 mA q I V - V = 5 V 3.2 4.5 A I O I Short-circuit current sc V - V = 25 V 0.2 0.5 A I O Thermal regulation T = 25°C, 30 ms pulse 0.008 0.04 %/W A f = 120 Hz, C = 25 µF, I = 3 A SVR Supply voltage rejection O O 60 72 dB V = 10 ± 3 V I RMS output noise voltage (% eN T = 25°C, f = 10 Hz to 10 kHz 0.003 % of V ) A O S Temperature stability 0.5 % S Long term stability T = 125°C, 1000 Hrs 0.5 % A 1. See short-circuit current curve for available output current at fixed dropout. 10/27 DocID6738 Rev 27

LD1085 Electrical characteristics V = 4.25 V, C = C =10 µF, T = -40 to 125 °C, unless otherwise specified. I I O A Table 7. Electrical characteristics of LD1085# Symbol Parameter Test condition Min. Typ. Max. Unit I = 10 mA T = 25°C 1.237 1.25 1.263 V V Reference voltage (1) O J ref I = 10 mA to 3 A, V = 2.85 to 30 V 1.225 1.25 1.275 V O I I = 10 mA, V = 2.85 to 16.5 V, O I 0.015 0.2 % ΔVO Line regulation TJ = 25°C I = 10 mA, V = 2.85 to 16.5 V 0.035 0.2 % O I I = 10 mA to 3 A, T = 25°C 0.1 0.3 % ΔV Load regulation O J O I = 0 to 3 A 0.2 0.4 % O V Dropout voltage I = 3 A 1.3 1.5 V d O I Minimum load current V = 30 V 3 10 mA O(min) I V - V = 5 V 5.5 6.5 A I O I Short-circuit current sc V - V = 25 V 0.5 0.7 A I O Thermal regulation T = 25°C, 30ms pulse 0.003 0.015 %/W A f = 120 Hz, C = 25 µF,C = 25 µF, SVR Supply voltage rejection O ADJ 60 72 dB I = 3 A, V = 6.25 ± 3 V O I I Adjust pin current V = 4.25 V, I = 10 mA 55 120 µA ADJ I O ΔI Adjust pin current change (1) I = 10 mA to 3 A, V = 2.85 to 16.5 V 0.2 5 µA ADJ O I RMS output noise voltage (% eN T = 25°C, f =10 Hz to 10 kHz 0.003 % of V ) A O S Temperature stability 0.5 % S Long term stability T = 125°C, 1000 Hrs 0.5 % A 1. See short-circuit current curve for available output current at fixed dropout. DocID6738 Rev 27 11/27

Typical characteristics LD1085 6 Typical characteristics Unless otherwise specified T = 25 °C, C = C = 10 µF. J I O Figure 4. O utput voltage vs. temp. (I = 3 A) Figure 5. Output voltage vs. temp. (I = 0 mA) O O Figure 6. Output voltage vs. temp. (I = 10 mA) Figure 7. Short-circuit current vs. dropout O voltage 12/27 DocID6738 Rev 27

LD1085 Typical characteristics Figure 8. Line regulation vs. temp. (I = 10 mA) Figure 9. Load regulation vs. temperature O 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 DocID6738 Rev 27 13/27

Typical characteristics LD1085 Figure 14. Line regulation vs. temperature Figure 15. Supply voltage rejection vs. output (V = 15 V) current IN Figure 1 6. Supply voltage rejection vs. Figure 17. Supply voltage rejection vs. frequency temperature Figure 18. Minimum load current vs. Figure 19. Stability, V = 1.8 V O temperature 14/27 DocID6738 Rev 27

LD1085 Typical characteristics Figure 20. Stability, V = 12 V Figure 21. Line transient O V=12 to 13V, I =200mA, C = 1µF(tant), I O I C =10µF(tant), C =1µF O ADJ F igure 22. Load transient Figure 23. Load transient (No C ) ADJ V=12V, I =0.12 to 3A, C = 1µF(tant), V=12V, I =0.12 to 3A, C = 1µF(tant), I O I I O I C =10µF(tant), C =1µF C =10µF(tant), no C O ADJ O ADJ DocID6738 Rev 27 15/27

Package mechanical data LD1085 7 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. 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 16/27 DocID6738 Rev 27

LD1085 Package mechanical data Figure 24. TO-220 drawing (cid:27)(cid:20)(cid:26)(cid:23)(cid:25)(cid:21)(cid:26)(cid:66)(cid:85)(cid:72)(cid:89)(cid:39) DocID6738 Rev 27 17/27

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 H G G1 L2 L4 L3 7012510_Rev_K 18/27 DocID6738 Rev 27

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 10.40 E1 8.50 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 0.4 V2 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 10.40 E1 8.50 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 0.4 V2 0° 8° DocID6738 Rev 27 21/27

Package mechanical data LD1085 Figure 27. D²PAK/A mechanical data 7106164_E 22/27 DocID6738 Rev 27

LD1085 Packaging mechanical data 8 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 330 B0 15.7 15.9 B 1.5 D 1.5 1.6 C 12.8 13.2 D1 1.59 1.61 D 20.2 E 1.65 1.85 G 24.4 26.4 F 11.4 11.6 N 100 K0 4.8 5.0 T 30.4 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 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 Top cover P0 D P2 T tape E F K0 W B1 B0 For machine ref. only A0 P1 D1 including draft and radii concentric around B0 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 G measured at hub in core for tape start 25 mm min. width AM08851v2 24/27 DocID6738 Rev 27

LD1085 Order codes 9 Order codes Table 13. Order codes Packages Output voltage TO-220 TO-220FP D²PAK D²PAK/A (T&R) LD1085D2M18R 1.8 V LD1085D2M25R 2.5 V LD1085D2T33R LD1085D2M33R 3.3 V LD1085V50 5.0 V LD1085V LD1085P LD1085D2T-R LD1085D2M-R ADJ DocID6738 Rev 27 25/27

Revision history LD1085 10 Revision history Table 14. Document revision history Date Revision Changes 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 V test value in tables 3, 4 and 11. O 04-Apr-2007 17 Order codes updated. 07-Jun-2007 18 Order codes updated. 05-Dec-2007 19 Modified: Table13. Added new order codes for Automotive grade products see Table13 on 29-Jan-2008 20 page25. 18-Feb-2008 21 Modified: Table13 on page25. 09-Apr-2008 22 Modified: Table13 on page25. 14-Jul-2008 23 Modified: Table13 on page25. 22-Aug-2008 24 Modified: Table2 on page5. 28-Jul-2009 25 Modified: Table13 on page25. – Modified Output voltage in Voltage reference parameter Table7 on page11 18-Feb-2013 26 and Table8 on page12. – Minor text changes throughout the document. 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). 08-Oct-2013 27 Modified Figure2: Pin connections (top view), Table2: Thermal data, Table13: Order codes, Section7: Package mechanical data. Added Section8: Packaging mechanical data. Minor text changes. 26/27 DocID6738 Rev 27

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Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: S TMicroelectronics: LD1085V LD1085P LD1085D2M18R LD1085V50 LD1085D2T-R LD1085D2M25R LD1085D2T33R LD1085D2M- R LD1085D2M33R