LD1085C 3 A low-drop, adjustable positive voltage regulator Datasheet - production data The device is supplied in DPAK. The on-chip trimming allows the regulator to reach a very tight output voltage tolerance, within 2% at 25 C. Table 1. Device summary Order code Package LD1085CDT-R DPAK (tape and reel) DPAK Features * Typical dropout 1.3 V (at 3 A) * 3-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 Description The LD1085C is a low-drop voltage regulator, providing up to 3 A of output current.The dropout is guaranteed to be as low as 1.5 V at the maximum current and it decreases at lower loads. The LD1085C is pin-to-pin compatible with the old 3-terminal adjustable regulators, but it has better performances in terms of drop and output tolerance. Unlike PNP regulators, where a part of the output current is wasted as quiescent current, the LD1085C quiescent current flows into the load, so to increase the efficiency. A minimum capacitor of 10 F is needed for stability. November 2013 This is information on a product in full production. DocID8223 Rev 10 1/17 www.st.com Contents LD1085C Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 Typical applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8 Packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2/17 DocID8223 Rev 10 LD1085C 1 Diagram Diagram Figure 1. Schematic diagram DocID8223 Rev 10 3/17 17 Pin configuration 2 LD1085C Pin configuration Figure 2. Pin connections (top view) 4/17 DocID8223 Rev 10 LD1085C 3 Maximum ratings 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 conditions is not implied. Table 3. Thermal data Symbol Parameter RthJC Thermal resistance junction-case RthJA Thermal resistance junction-ambient DocID8223 Rev 10 DPAK Unit 3 C/W 62.5 C/W 5/17 17 Schematic application 4 LD1085C Schematic application Figure 3. Application circuit R2 VO = V REF 1 + ------- R 1 6/17 DocID8223 Rev 10 LD1085C 5 Electrical characteristics Electrical characteristics VI = 4.25 V, CI = CO =10 F, TA = -40 to 125 C, unless otherwise specified . Table 4. LD1085CDT electrical characteristics Symbol VRef VO Parameter Reference voltage(1) Test conditions Min. Typ. Max. Unit 1.225 1.25 1.275 V 1.213 1.25 1.288 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 5 A, TJ = 25 C 0.1 0.3 % IO = 0 to 5 A 0.2 0.4 % IO = 10 mA TJ = 25 C IO = 10 mA to 3 A, VI = 2.85 to 30 V Line regulation (1) VO Load regulation Vd Dropout voltage IO = 5 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 3.2 4.5 A VI - VO = 25 V 0.2 0.5 A Thermal regulation TA = 25 C, 30 ms pulse SVR Supply voltage rejection f = 120 Hz, CO = 25 F, CADJ = 25 F, IO = 3 A, VI = 6.25 3 V IADJ Adjust pin current VI = 4.25 V, IO = 10 mA 55 120 A IADJ Adjust pin current change IO = 10 mA to 3 A, VI = 2.75 to 16.5 V (1) 0.2 5 A 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 75 %/W dB 0.003 % 0.5 % 0.5 % 1. See short-circuit current curve for available output current at fixed dropout. DocID8223 Rev 10 7/17 17 Typical applications 6 LD1085C Typical applications Unless otherwise specified TJ = 25 C, CI = CO = 10 F. 8/17 Figure 4. Output voltage vs temperature Figure 5. Short-circuit current vs dropout voltage Figure 6. Line regulation vs temperature Figure 7. Load regulation vs temperature DocID8223 Rev 10 LD1085C Typical applications Figure 8. Dropout voltage vs temperature Figure 9. Dropout voltage vs output current Figure 10. Adjust pin current vs temperature Figure 11. Quiescent current vs temperature Figure 12. Supply voltage rejection vs output current Figure 13. Supply voltage rejection vs frequency DocID8223 Rev 10 9/17 17 Typical applications LD1085C Figure 14. Supply voltage rejection vs temperature Figure 15. Minimum load current vs temperature Figure 16. Stability Figure 17. Line transient VI=12 to 13 V, IO=200 mA, CI = 1 F (tant), CO=10 F (tant), CADJ=1 F Figure 18. Load transient Figure 19. Load transient, no Cadj VI=12 V, IO=0.12 to 3 A, CI = 1 F (tant), CO=10 F (tant), CADJ=1 F 10/17 VI=12 V, IO=0.12 to 3 A, CI = 1 F (tant), CO=10 F (tant), no CADJ DocID8223 Rev 10 LD1085C 7 Package mechanical data Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) is an ST trademark. Table 5. DPAK mechanical data mm Dim. Min. Typ. Max. A 2.20 2.40 A1 0.90 1.10 A2 0.03 0.23 b 0.64 0.90 b4 5.20 5.40 c 0.45 0.60 c2 0.48 0.60 D 6.00 6.20 D1 E 5.10 6.40 6.60 E1 4.70 e 2.28 e1 4.40 4.60 H 9.35 10.10 L 1.00 1.50 (L1) 2.80 L2 0.80 L4 0.60 1.00 R V2 0.20 0 8 DocID8223 Rev 10 11/17 17 Package mechanical data LD1085C Figure 20. DPAK drawing 0068772_K 12/17 DocID8223 Rev 10 LD1085C Package mechanical data Figure 21. DPAK footprint (a) Footprint_REV_K a. All dimensions are in millimeters DocID8223 Rev 10 13/17 17 Packaging mechanical data 8 LD1085C Packaging mechanical data Table 6. DPAK tape and reel mechanical data Tape Reel mm mm Dim. Dim. Min. Max. A0 6.8 7 A B0 10.4 10.6 B 1.5 12.1 C 12.8 1.6 D 20.2 G 16.4 50 B1 14/17 Min. Max. 330 13.2 D 1.5 D1 1.5 E 1.65 1.85 N F 7.4 7.6 T K0 2.55 2.75 P0 3.9 4.1 Base qty. 2500 P1 7.9 8.1 Bulk qty. 2500 P2 1.9 2.1 R 40 T 0.25 0.35 W 15.7 16.3 DocID8223 Rev 10 18.4 22.4 LD1085C Packaging mechanical data Figure 22. Tape for DPAK 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 23. Reel for DPAK 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 DocID8223 Rev 10 15/17 17 Revision history 9 LD1085C Revision history Table 7. Document revision history Date Revision 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. 9 Updated Description in cover page, Figure 2, Figure 3 and Table 4. Modified Section 6: Typical applications and Section 7: Package mechanical data. Added Section 8: Packaging mechanical data. Minor text changes. 10 RPN LD1085CXX changed to LD1085C. Updated the Description in cover page. Minor text changes. 11-Jul-2013 04-Nov-2013 16/17 Changes DocID8223 Rev 10 LD1085C Please Read Carefully: Information in this document is provided solely in connection with ST products. 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