Datasheet

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This is information on a product in full production.

November 2013 DocID8223 Rev 10 1/17

LD1085C

3 A low-drop, adjustable positive voltage regulator

Datasheet

production data

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 µF is needed for stability.

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.

DPAK

Table 1. Device summary

Order code Package

LD1085CDT-R DPAK (tape and reel)

www.st.com

Summary of content (17 pages)

PAGE 1
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.
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Contents LD1085C Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Electrical characteristics . . . . . .
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LD1085C 1 Diagram Diagram Figure 1.
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Pin configuration 2 LD1085C Pin configuration Figure 2.
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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.
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Schematic application 4 LD1085C Schematic application Figure 3.
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LD1085C 5 Electrical characteristics Electrical characteristics VI = 4.25 V, CI = CO =10 µF, TA = -40 to 125 °C, unless otherwise specified . Table 4. LD1085CDT electrical characteristics Symbol VRef ΔVO 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.
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Typical applications 6 LD1085C Typical applications Unless otherwise specified TJ = 25 °C, CI = CO = 10 µF. 8/17 Figure 4. Output voltage vs temperature Figure 5. Short-circuit current vs dropout voltage Figure 6. Line regulation vs temperature Figure 7.
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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.
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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 µF (tant), CO=10 µF (tant), CADJ=1 µF Figure 18. Load transient Figure 19. Load transient, no Cadj VI=12 V, IO=0.12 to 3 A, CI = 1 µF (tant), CO=10 µF (tant), CADJ=1 µF 10/17 VI=12 V, IO=0.
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LD1085C 7 Package mechanical data 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 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.
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Package mechanical data LD1085C Figure 20.
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LD1085C Package mechanical data Figure 21. DPAK footprint (a) Footprint_REV_K a.
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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.
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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.
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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.
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LD1085C 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.