Datasheet

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This is information on a product in full production.

September 2013 DocID9035 Rev 10 1/16

LD1084

5 A low-drop positive voltage regulator adjustable

Datasheet

production data

Features

• Typical dropout 1.3 V (at 5 A)

• Three-terminal adjustable output voltage

• Guaranteed output current up to 5 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

• Pinout compatibility with standard adjustable

VREG

Description

The LD1084 is a low-drop voltage regulator

providing up to 5 A of output current. Dropout is

guaranteed at a maximum of 1.5 V at the

maximum output current, decreasing at lower

loads. The LD1084 is pin-to-pin compatible with

the older 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

LD1084 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 TO-220. The on-chip

trimming allows the regulator to reach a very tight

output voltage tolerance, within ± 1% at 25 °C.

TO-220

Table 1. Device summary

Order code Output voltage

LD1084V adjustable

www.st.com

Summary of content (16 pages)

PAGE 1
LD1084 5 A low-drop positive voltage regulator adjustable Datasheet - production data LD1084 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 TO-220. The on-chip trimming allows the regulator to reach a very tight output voltage tolerance, within ± 1% at 25 °C. Table 1. Device summary TO-220 Order code Output voltage LD1084V adjustable Features • Typical dropout 1.
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Contents LD1084 Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Electrical characteristics . . . . . . .
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LD1084 1 Diagram Diagram Figure 1.
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Pin configuration 2 LD1084 Pin configuration Figure 2.
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LD1084 Maximum ratings 3 Maximum ratings Table 2. 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 conditions is not implied. Table 3.
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Schematic application 4 LD1084 Schematic application Figure 3.
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LD1084 5 Electrical characteristics Electrical characteristics VI = 4.25 V, CI = CO = 10 µF, TA = -40 to 125 °C, unless otherwise specified. Table 4. LD1084 electrical characteristics Symbol Parameter Vref Reference voltage (1) ΔVO Line regulation Test conditions 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 16.5V, 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 performance characteristics 6 LD1084 Typical performance characteristics Unless otherwise specified TJ = 25 °C, CI = 10 µF (tant.), CO = 22 µF (tant.) Figure 4. Short-circuit current vs. dropout Figure 5. Line regulation vs. temperature voltage Figure 6. Quiescent current vs. temperature Figure 7. Output voltage vs. temperature Figure 8. Load regulation vs. temperature Figure 9. Quiescent current vs.
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LD1084 Typical performance characteristics Figure 10. Quiescent current vs. input voltage Figure 11. Dropout voltage vs. output current Figure 12. Supply voltage rejection vs. output current Figure 13. Dropout voltage vs. temperature Figure 14. Supply voltage rejection vs. temperature Figure 15. Supply voltage rejection vs.
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Typical performance characteristics LD1084 Figure 16. Adjust pin current vs. output current Figure 17. Reference voltage vs. temperature Figure 18. Load regulation vs. temperature Figure 19. Adjust pin current vs. temperature Figure 20. Line regulation vs. temperature Figure 21. Minimum load current vs.
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LD1084 Typical performance characteristics Figure 22. Supply voltage rejection vs. temperature Figure 23. Supply voltage rejection vs. frequency Figure 24. Stability Figure 25. Supply voltage rejection vs. output current Figure 26. Stability Figure 27.
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Typical performance characteristics LD1084 Figure 28. Line transient Figure 29. Load transient VI=12 to 13 V, IO = 200 mA, CI = 1 µF (tant), CO= 10 µF (tant), No CADJ ts = tf = 5 µs VI =15 V, IO = 0.1 to 5 A, CI = 1 µF (tant), CO= 10 µF (tant) Figure 30. Load transient Figure 31. Line transient VI = 15 V, IO= 0.1 to 5 A, CI = 1 µF (tant), CO= 10 µF (tant), No CADJ VI=12 to 13 V, IO= 200 mA, CI = 1 µF (tant), CO= 10 µF(tant), CADJ = 1µF, ts = tf = 5 µs Figure 32. Load transient VI=13 V, IO= 0.
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LD1084 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. 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.
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Package mechanical data LD1084 Figure 33.
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LD1084 8 Revision history Revision history Table 6. Document revision history Date Revision 07-Oct-2004 3 Mistake order codes - Table 1. 08-Feb-2005 4 Mistake U.M. Load Regulation - V ==> mV. 16-Jun-2005 5 Order codes updated. 04-Apr-2007 6 Order code updated. 07-Jun-2007 7 Order codes updated. 08-Apr-2008 8 Modified: Table 1 on page 1. Removed: packages D²PAK, D²PAK/A and mechanical data. 29-Jul-2009 9 Modified: Table 1 on page 1. 10 RPN LD1084XX changed to LD1084.
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LD1084 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.