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| LD1084xx 5 A low drop positive voltage regulator adjustable and fixed Features Typical dropout 1.3 V (at 5 A) Three terminal adjustable or fixed output voltage 2.5 V, 5 V, 12 V. 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 The device is supplied in TO-220. On chip trimming allows the regulator to reach a very tight output voltage tolerance, within 1 % at 25 C. TO-220 Description The LD1084xx is a low drop voltage regulator able to provide 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 LD1084xx is pin to pin compatible with the older 3-terminal adjustable regulators, but has better performances in term of drop and output tolerance. A 2.85 V output version is suitable for SCSI-2 active termination. Unlike PNP regulators, where a part of the output current is wasted as quiescent current, the LD1084xx quiescent current flows into the load, so increase efficiency. Only a 10 F minimum capacitor is need for stability. Table 1. Device summary Part numbers LD1084XX12 LD1084XX25 LD1084XX50 LD1084XX Order codes LD1084V12 LD1084V25 LD1084V50 LD1084V Rev 8 Output voltage 12 V 2.5 V 5.0 V Adjustable 1/19 www.st.com 19 April 2008 Contents LD1084xx Contents 1 2 3 4 5 6 7 8 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2/19 LD1084xx Diagram 1 Figure 1. Diagram Schematic diagram 3/19 Pin configuration LD1084xx 2 Figure 2. Pin configuration Pin connections (top view) 4/19 LD1084xx Maximum ratings 3 Table 2. Maximum ratings Absolute maximum ratings Parameter DC input voltage Output current Power dissipation Storage temperature range Operating junction temperature range Value 30 Internally limited Internally limited -55 to +150 -40 to +125 Unit V mA mW C C Symbol VI IO PD TSTG TOP Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied Thermal data Parameter Thermal resistance junction-case Thermal resistance junction-ambient TO-220 3 50 Unit C/W C/W Table 3. Symbol RthJC RthJA 5/19 Schematic application LD1084xx 4 Figure 3. Schematic application Application circuit R2 V O = V REF 1 + ------ R 1 6/19 LD1084xx Electrical characteristics 5 Table 4. Symbol VO VO VO Vd Iq Isc Electrical characteristics Electrical characteristics of LD1084#25 (VI = 5.5 V, CI = CO = 10 F, TA = -40 to 125 C, unless otherwise specified). Parameter Output voltage (1) Test condition IO = 0 mA, TJ = 25C IO = 0 to 5A, VI = 4.1 to 30V Line regulation IO = 0 mA, VI = 4.1 to 18V, TJ = 25C IO = 0 mA, VI = 4.1 to 18V Load regulation Dropout voltage Quiescent current Short circuit current Thermal regulation SVR eN S S Supply voltage rejection RMS output noise voltage (% of VO) Temperature stability Long term stability TA = 125C, 1000Hrs IO = 0 to 5A, TJ = 25C IO = 0 to 5A IO = 5A VI 30V VI - VO = 5V VI - VO = 25V TA = 25C, 30ms pulse f = 120 Hz, CO = 25F, IO = 5A VI = 7.5 3V TA = 25C, f = 10Hz to 10kHz 60 5.5 0.5 Min. 2.475 2.45 Typ. 2.5 2.5 0.5 0.1 3 7 1.3 5 6.5 0.7 0.003 0.015 72 0.003 0.5 0.5 Max. 2.525 2.55 6 6 15 20 1.5 10 Unit V V mV mV mV mV V mA A A %/W dB % % % 1. See short-circuit current curve for available output current at fixed dropout. 7/19 Electrical characteristics LD1084xx Table 5. Symbol VO VO VO Vd Iq Isc Electrical characteristics of LD1084#50 (VI = 8 V, CI = CO = 10 F, TA = -40 to 125 C, unless otherwise specified). Parameter Output voltage (1) Test condition IO = 0 mA, TJ = 25C IO = 0 to 5A, VI = 6.6 to 30V Line regulation IO = 0 mA, VI = 6.6 to 20V, TJ = 25C IO = 0 mA, VI = 6.6 to 20V Load regulation Dropout voltage Quiescent current Short circuit current Thermal regulation IO = 0 to 5A, TJ = 25C IO = 0 to 5A IO = 5A VI 30V VI - VO = 5V VI - VO = 25V TA = 25C, 30ms pulse f = 120 Hz, CO = 25F, IO = 5A VI = 10 3V TA = 25C, f =10Hz to 10kHz 60 5.5 0.5 Min. 4.95 4.9 Typ. 5 5 0.5 1 5 10 1.3 5 6.5 0.7 0.003 0.015 72 0.003 0.5 TA = 125C, 1000Hrs 0.5 Max. 5.05 5.1 10 10 20 35 1.5 10 Unit V V mV mV mV mV V mA A A %/W dB % % % SVR eN S S Supply voltage rejection RMS output noise voltage (% of VO) Temperature stability Long term stability 1. See short-circuit current curve for available output current at fixed dropout. 8/19 LD1084xx Electrical characteristics Table 6. Symbol VO Electrical characteristics of LD1084#12 (VI = 15 V, CI = CO = 10 F, TA = -40 to 125 C, unless otherwise specified). Parameter Output voltage (1) Test condition IO = 0 mA, TJ = 25C IO = 0 to 5A, VI = 13.6 to 30V Line regulation IO = 0 mA, VI = 13.6 to 25V, TJ = 25C IO = 0 mA, VI = 13.6 to 25V Min. 11.88 11.76 Typ. 12 12 2 4 12 24 1.3 5 5.5 0.5 6.5 0.7 0.003 0.015 54 66 0.003 0.5 TA = 125C, 1000Hrs 0.5 Max. 12.12 12.24 25 25 36 72 1.5 10 Unit V V mV mV mV mV V mA A A %/W dB % % % VO VO Vd Iq Isc Load regulation Dropout voltage Quiescent current Short circuit current Thermal regulation IO = 0 to 5A, TJ = 25C IO = 0 to 5A IO = 5A VI 30V VI - VO = 5V VI - VO = 25V TA = 25C, 30ms pulse f = 120 Hz, CO = 25F, IO = 5A VI = 17 3V TA = 25C, f =10Hz to 10kHz SVR eN S S Supply voltage rejection RMS output noise voltage (% of VO) Temperature stability Long term stability 1. See short-circuit current curve for available output current at fixed dropout. 9/19 Electrical characteristics LD1084xx Table 7. Symbol VO Electrical characteristics of LD1084 (VI = 4.25 V, CI = CO =10 F, TA = -40 to 125 C, unless otherwise specified). Parameter Output voltage (1) Test condition IO = 10mA TJ = 25C IO = 10mA to 3A, VI = 2.85 to 30V Line regulation IO = 10mA, VI = 2.85 to 16.5V, TJ = 25C IO = 10mA, VI = 2.85 to 16.5V Min. 1.237 1.225 Typ. 1.25 1.25 0.015 0.035 0.1 0.2 1.3 3 5.5 0.5 6.5 0.7 0.003 0.015 60 72 55 0.2 0.003 0.5 TA = 125C, 1000Hrs 0.5 120 5 Max. 1.263 1.275 0.2 0.2 0.3 0.4 1.5 10 Unit V V % % % % V mA A A %/W dB A A % % % VO VO Vd IO(min) Isc Load regulation Dropout voltage Minimum load current Short circuit current Thermal regulation IO = 10mA to 5A, TJ = 25C IO = 0 to 5A IO = 5A VI = 30V VI - VO = 5V VI - VO = 25V TA = 25C, 30ms pulse f = 120 Hz, CO = 25F,CADJ = 25 F, IO = 5A, VI = 6.25 3V VI = 4.25V, IO = 10 mA IO = 10mA to 5A, VI = 2.85 to 16.5V TA = 25C, f =10Hz to 10kHz SVR IADJ IADJ eN S S Supply voltage rejection Adjust pin current Adjust pin current change (1) RMS output noise voltage (% of VO) Temperature stability Long term stability 1. See short-circuit current curve for available output current at fixed dropout. 10/19 LD1084xx Typical application 6 Figure 4. Typical application Unless otherwise specified TJ = 25C, CI = 10F (tant.), CO = 22F (tant.) 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 output voltage 11/19 Typical application LD1084xx 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 frequency 12/19 LD1084xx Typical application 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 temperature 13/19 Typical application LD1084xx 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. Line transient VI=14 to 15V, IO=200mA,CI = 1F(tant), CO=10F(tant), ts=tf=5ms 14/19 LD1084xx Figure 28. Line transient Figure 29. Load transient Typical application VI=12 to 13V, IO=200mA, CI = 1F(tant), CO=10F(tant), No CADJ ts=tf=5s VI=15 V, IO=0.1 to 5 A, CI = 1F(tant), CO=10F(tant) Figure 30. Load transient Figure 31. Line transient VI=15 V, IO=0.1 to 5 A, CI = 1F(tant), CO=10F(tant), No CADJ VI=12 to 13V, IO=200mA, CI = 1F(tant), CO=10F(tant), CADJ = 1F ts=tf=5s Figure 32. Load Transient VI=13 V, IO=0.1 to 5 A, CI = 1F(tant), CO=10F(tant) 15/19 Package mechanical data LD1084xx 7 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. 16/19 LD1084xx Package mechanical data TO-220 mechanical data Dim. A C D D1 E F F1 F2 G G1 H2 L2 L4 L5 L6 L7 L9 DIA. 13.0 2.65 15.25 6.2 3.5 3.75 0.49 0.61 1.14 1.14 4.95 2.4 10.0 16.4 14.0 2.95 15.75 6.6 3.93 3.85 0.511 0.104 0.600 0.244 0.137 0.147 mm. Min. 4.40 1.23 2.40 1.27 0.70 0.88 1.70 1.70 5.15 2.7 10.40 0.019 0.024 0.044 0.044 0.194 0.094 0.393 0.645 0.551 0.116 0.620 0.260 0.154 0.151 Typ. Max. 4.60 1.32 2.72 Min. 0.173 0.048 0.094 0.050 0.027 0.034 0.067 0.067 0.203 0.106 0.409 inch. Typ. Max. 0.181 0.051 0.107 P011C 17/19 Revision history LD1084xx 8 Table 8. Date Revision history Document revision history Revision 3 4 5 6 7 8 Mistake order codes - Table 1. Mistake U.M. Load Regulation - V ==> mV. Order codes updated. Order code updated. Order codes updated. Modified: Table 1 on page 1. Removed: packages DPAK, DPAK/A and mechanical data. Changes 07-Oct-2004 08-Feb-2005 16-Jun-2005 04-Apr-2007 07-Jun-2007 08-Apr-2008 18/19 LD1084xx 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. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. 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Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. (c) 2008 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 19/19 |
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