LD1085CXX

LD1085CXX 3 A low-drop, adjustable positive voltage regulator Features ■ ■ ■ ■ ■ ■ ■ ■ Typical dropout 1.3 V (at 3 A) Three 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 DPAK Description The LD1085C is a low drop voltage regulator able to provide up to 3 A of output current. Dropout is guaranteed at a maximum of 1.5 V at the maximum output current, decreasing at lower loads. The LD1085C 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 LD1085C quiescent current flows into the load, so increase efficiency. Only a 10 µF minimum capacitor is need for stability. The device is supplied in DPAK. On chip trimming allows the regulator to reach a very tight output voltage tolerance, within ± 2 % at 25 °C. Table 1. Device summary Order codes LD1085CDT-R Packages DPAK (tape and reel) April 2008 Rev 8 1/16 www.st.com 16 Contents LD1085CXX 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2/16 LD1085CXX Diagram 1 Figure 1. Diagram Schematic diagram 3/16 Pin configuration LD1085CXX 2 Figure 2. Pin configuration Pin connections (top view) DPAK 4/16 LD1085CXX 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 °C °C Unit V 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 DPAK 3 62.5 Unit °C/W °C/W Table 3. Symbol RthJC RthJA 5/16 Schematic application LD1085CXX 4 Figure 3. Schematic application Application circuit R2 V O = V REF ⋅ ⎛ 1 + ------⎞ ⎝ R 1⎠ 6/16 LD1085CXX Electrical characteristics 5 Table 4. Symbol VO Electrical characteristics Electrical characteristics of LD1085CDT (VI = 4.25 V, CI = CO =10 µF, TA = -40 to 125 °C, unless otherwise specified). Parameter Output voltage (1) Test condition IO = 10mA TJ = 25°C IO = 10mA to 3A, VI = 2.85 to 30V Line regulation IO = 10mA, VI = 2.85 to 16.5V, TJ = 25°C IO = 10mA, VI = 2.85 to 16.5V ΔVO Vd Load regulation Dropout voltage Minimum load current Short circuit current Thermal regulation SVR IADJ ΔIADJ eN S S Supply voltage rejection Adjust pin current Adjust pin current change RMS output noise voltage (% of VO) Temperature stability Long term stability TA = 125°C, 1000Hrs IO = 10mA to 5A, TJ = 25°C IO = 0 to 5A IO = 5A VI = 30V VI - VO = 5V VI - VO = 25V TA = 25°C, 30ms pulse f = 120 Hz, CO = 25µF,CADJ = 25 µF, IO = 3A, VI = 6.25 ± 3V VI = 4.25V, IO = 10 mA IO = 10mA to 3A, VI = 2.75 to 16.5V (1) TA = 25°C, f =10Hz to 10kHz 60 3.2 0.2 (1) Min. 1.225 1.213 Typ. 1.25 1.25 0.015 0.035 0.1 0.2 1.3 3 4.5 0.5 Max. 1.275 1.288 0.2 0.2 0.3 0.4 1.5 10 Unit V V % % % % V mA A A %/W dB ΔVO IO(min) Isc 0.003 0.015 75 55 0.2 0.003 0.5 0.5 120 5 µA µA % % % 1. See short-circuit current curve for available output current at fixed dropout. 7/16 Typical application LD1085CXX 6 Figure 4. Typical application (Unless otherwise specified TJ = 25 °C, CI = CO = 10 µF) Output voltage vs temperature Figure 5. Output voltage vs temperature Figure 6. Output voltage vs temperature Figure 7. Short circuit current vs dropout voltage Figure 8. Line regulation vs temperature Figure 9. Load regulation vs temperature 8/16 LD1085CXX Typical application 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 Figure 14. Line regulation vs temperature Figure 15. Supply voltage rejection vs output current 9/16 Typical application LD1085CXX Figure 16. Supply voltage rejection vs frequency Figure 17. Supply voltage rejection vs temperature Figure 18. Minimum load current vs temperature Figure 19. Stability Figure 20. Stability Figure 21. Line transient VI=12 to 13V, IO=200mA, CI = 1µF(tant), CO=10µF(tant), CADJ=1µF 10/16 LD1085CXX Typical application Figure 22. Line transient Figure 23. Load transient VI=12 to 13V, IO=200mA, CI = 1µF(tant), CO=10µF(tant), CADJ=1µF VI=12V, IO=0.12 to 3A, CI = 1µF(tant), CO=10µF(tant), CADJ=1µF Figure 24. Load transient VI=12V, IO=0.12 to 3A, CI = 1µF(tant), CO=10µF(tant), CADJ=1µF 11/16 Package mechanical data LD1085CXX 7 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® 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. 12/16 LD1085CXX Package mechanical data DPAK mechanical data mm. Dim. Min. A A1 A2 B b4 C C2 D D1 E E1 e e1 H L (L1) L2 L4 R V2 2.2 0.9 0.03 0.64 5.2 0.45 0.48 6 5.1 6.4 4.7 2.28 4.4 9.35 1 2.8 0.8 0.6 0.2 0° 8° 0° 1 0.023 0.008 8° 4.6 10.1 0.173 0.368 0.039 0.110 0.031 0.039 6.6 0.252 0.185 0.090 0.181 0.397 Typ. Max. 2.4 1.1 0.23 0.9 5.4 0.6 0.6 6.2 Min. 0.086 0.035 0.001 0.025 0.204 0.017 0.019 0.236 0.200 0.260 Typ. Max. 0.094 0.043 0.009 0.035 0.212 0.023 0.023 0.244 inch. 0068772-F 13/16 Package mechanical data LD1085CXX Tape & reel DPAK-PPAK mechanical data mm. Dim. Min. A C D N T Ao Bo Ko Po P 6.80 10.40 2.55 3.9 7.9 6.90 10.50 2.65 4.0 8.0 12.8 20.2 60 22.4 7.00 10.60 2.75 4.1 8.1 0.268 0.409 0.100 0.153 0.311 0.272 0.413 0.104 0.157 0.315 13.0 Typ. Max. 330 13.2 0.504 0.795 2.362 0.882 0.2.76 0.417 0.105 0.161 0.319 0.512 Min. Typ. Max. 12.992 0.519 inch. 14/16 LD1085CXX Revision history 8 Table 5. Date Revision history Document revision history Revision 6 7 8 Mistake in Table 1. Order codes updated. Modified: Table 1 on page 1. Changes 07-Oct-2004 03-Jul-2007 09-Apr-2008 15/16 LD1085CXX 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. 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