LD1585CXX 5 A low dropout fast response positive voltage regulator adjustable Features ■ Typical dropout 1.2 V ■ Fast transient response ■ Three terminal adjustable ■ 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 0 °C to 125 °C ■ Package available: TO-220 ■ Pinout compatibility with standard adjustable VREG TO-220 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. Description The LD1585C is a low drop voltage regulator able to provide up to 5 A of output current. Dropout is guaranteed at a maximum of 1.4 V at the maximum output current, decreasing at lower loads. The device has been improved to be utilized in low voltage applications where transient response and minimum input voltage are critical. The most important feature of the device consist in lower dropout voltage and very fast transient response. 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 LD1585C quiescent current flows into the load, so increase efficiency. Only a 10 µF minimum capacitor is need for stability. Table 1. July 2008 Device summary Part number Order code Output voltage LD1585CXX LD1585CV ADJ Rev 8 1/15 www.st.com 15 Contents LD1585CXX Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2/15 LD1585CXX Diagram 1 Diagram Figure 1. Schematic diagram 3/15 Pin configuration 2 Pin configuration Figure 2. Pin connections (top view) 4/15 LD1585CXX LD1585CXX 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 -55 to +150 °C 0 to +125 °C TSTG Storage temperature range TOP Operating junction temperature range Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 3. Thermal data Symbol Parameter Value Unit RthJC Thermal resistance junction-case 3 °C/W RthJA Thermal resistance junction-ambient 50 °C/W 5/15 Typical application 4 Typical application Figure 3. Application circuits LD1585CXX VO = VREF(1+R2/R1) 6/15 LD1585CXX Electrical characteristics 5 Electrical characteristics Table 4. Electrical characteristics of LD1585C# (VI = 4.25 V, CI = CO =10 µF, TJ = 0 to 125 °C, unless otherwise specified.) Symbol Parameter Test conditions Min. Typ. Max. Unit 1.237 1.25 1.263 V 1.225 1.25 1.275 V 0.015 0.2 % IO = 10mA, VI = 2.75 to 15V 0.1 0.2 % IO = 10mA to 5A, TJ = 25°C 0.1 0.3 % IO = 0 to 5A 0.25 0.5 % IO = 10mA, VI - VO = 3V, TJ = 25°C VO Output voltage ΔVO Line regulation ΔVO Load regulation Vd Dropout voltage IO = 5A 1.2 1.4 V Minimum load current VI = 25V 3 10 mA Short circuit current VI - VO = 5.5V Thermal regulation TJ = 25°C, 30ms pulse SVR Supply voltage rejection f = 120 Hz, CO = 25µF, CADJ = 25µF, IO = 5A, VI - VO = 3 ± 1V IADJ Adjust pin current IO = 10 mA IO(min) Isc IO = 10mA to 5A, VI - VO =1.5 to 25V IO = 10mA, VI = 2.75 to 15V TJ = 25°C ΔIADJ Adjust pin current change IO = 10mA to 5A, VI = 3 to 25V eN RMS output noise voltage (% of VO) TJ = 25°C, f =10Hz to 10kHz S Temperature stability S Long term stability (1) TJ = 125°C, 1000Hrs 5.5 7 0.004 (1) 60 A 0.02 75 %/W dB 50 100 µA 0.2 5 µA 0.003 % 0.5 % 0.5 % 1. See short-circuit current curve for available output current at fixed dropout. 7/15 Typical characteristics LD1585CXX 6 Typical characteristics Figure 4. (unless otherwise specified TJ = 25 °C, CI = CO = 10 µF tant.) Output voltage vs temperature Figure 5. Short circuit current vs dropout voltage Figure 6. Line regulation vs temperature Figure 7. Line regulation vs temperature Figure 8. Load regulation vs temperature Figure 9. Load regulation vs temperature 8/15 LD1585CXX Figure 10. Dropout voltage vs temperature Typical characteristics Figure 11. Dropout voltage vs output current Figure 12. Adjust pin current vs input voltage Figure 13. Adjust pin current vs temperature Figure 14. Adjust pin current change vs temperature Figure 15. Quiescent current vs temperature 9/15 Typical characteristics LD1585CXX Figure 16. Reference voltage vs temperature Figure 17. Minimum load current vs temperature Figure 18. Supply voltage rejection vs output current Figure 19. Supply voltage rejection vs output current Figure 20. Supply voltage rejection vs frequency Figure 21. Supply voltage rejection vs frequency 10/15 LD1585CXX Typical characteristics Figure 22. Supply voltage rejection vs temperature Figure 23. Supply voltage rejection vs temperature Figure 24. Line transient Figure 25. Load transient VI=15 to 16V, IO=200mA, CI = 1µF(tant), CO=10µF(tant) VI=15 V, IO=0.1 to 5 A, CI = 10µF(tant), CO=10µF(tant) Figure 26. Load transient VI=7 V, IO=0.1 to 5 A, CI = 10µF(tant), CO=10µF(tant) 11/15 Package mechanical data 7 LD1585CXX 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. 12/15 LD1585CXX Package mechanical data TO-220 mechanical data Dim. mm. Min. Max. Min. A 4.40 4.60 0.173 0.181 C 1.23 1.32 0.048 0.051 D 2.40 2.72 0.094 D1 Typ. inch. 1.27 Typ. Max. 0.107 0.050 E 0.49 0.70 0.019 0.027 F 0.61 0.88 0.024 0.034 F1 1.14 1.70 0.044 0.067 F2 1.14 1.70 0.044 0.067 G 4.95 5.15 0.194 0.203 G1 2.4 2.7 0.094 0.106 H2 10.0 10.40 0.393 L2 L4 16.4 13.0 0.409 0.645 14.0 0.511 0.551 L5 2.65 2.95 0.104 0.116 L6 15.25 15.75 0.600 0.620 L7 6.2 6.6 0.244 0.260 L9 3.5 3.93 0.137 0.154 DIA. 3.75 3.85 0.147 0.151 P011C 13/15 Revision history LD1585CXX 8 Revision history Table 5. Document revision history Date Revision 07-Oct-2004 3 Mistake order codes - Table 1. 20-Oct-2005 4 Order codes has been updated. 08-Jun-2007 5 Order codes updated. 29-Nov-2007 6 Added Table 1. 16-Apr-2008 7 Modified: Table 1 on page 1. 14-Jul-2008 8 Modified: Table 1 on page 1. 14/15 Changes LD1585CXX 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. 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