LD1085xx 3 A low drop positive voltage regulator adjustable and fixed Features ■ Typical dropout 1.3 V (at 3 A) ■ Three terminal adjustable or fixed output voltage 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5 V. ■ Guaranteed output current up to 3 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, TO-220FP, DPAK, D2PAK, D2PAK/A ■ DPAK Pinout compatibility with standard adjustable VREG TO-220FP TO-220 D2PAK D2PAK/A The device is supplied in TO-220, TO-220FP, DPAK, D2PAK and D2PAK/A. On chip trimming allows the regulator to reach a very tight output voltage tolerance, within ±1% at 25 °C. Description The LD1085xx is a low drop voltage regulator able to provide up to 3 A of output current. Dropout is guaranteed at a maximum of 1.2 V at the maximum output current, decreasing at lower loads. The LD1085xx 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 LD1085xx quiescent current flows into the load, so increase efficiency. Only a 10 µF minimum capacitor is need for stability. Table 1. Device summary Part number December 2007 LD1085XX LD1085XX25 LD1085XX15 LD1085XX33 LD1085XX18 LD1085XX50 Rev 19 1/27 www.st.com 27 Contents LD1085xx Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 8 Order codes 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 2/27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 LD1085xx Diagram 1 Diagram Figure 1. Schematic diagram 3/27 Pin configuration LD1085xx 2 Pin configuration Figure 2. Pin connections (top view) TO-220 TO-220FP D2PAK D2PAK/A DPAK 4/27 LD1085xx 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 condition is not implied Table 3. Thermal data Symbol Parameter TO-220 DPAK D2PAK D2PAK/A Unit RthJC Thermal resistance junction-case 3 8 3 °C/W RthJA Thermal resistance junction-ambient 50 100 62.5 °C/W 5/27 Schematic application 4 Schematic application Figure 3. Application circuit LD1085xx R V O = V REF ⋅ ⎛ 1 + ------2-⎞ ⎝ R ⎠ 1 6/27 LD1085xx Electrical characteristics 5 Electrical characteristics Table 4. Electrical characteristics of LD1085#15 (VI = 4.5 V, CI = CO =10 µF, TA = -40 to 125 °C, unless otherwise specified). Symbol Parameter Test condition Min. Typ. Max. Unit IO = 0 mA, TJ = 25°C 1.485 1.5 1.515 V IO = 0 to 3A, VI = 3.1 to 30V 1.47 1.5 1.53 V IO = 0 mA, VI = 3.1 to 18V, TJ = 25°C 0.2 4 mV IO = 0 mA, VI = 3.1 to 15V 0.4 4 mV IO = 0 to 3A, TJ = 25°C 2 10 mV IO = 0 to 3A 4 20 mV VO Output voltage (1) ΔVO Line regulation ΔVO Load regulation Vd Dropout voltage IO =3 A 1.3 1.5 V Iq Quiescent current VI ≤30V 5 10 mA Isc Short circuit current SVR eN VI - VO = 5V 3.2 4.5 A VI - VO = 25V 0.2 0.5 A Thermal regulation TA = 25°C, 30ms pulse Supply voltage rejection f = 120 Hz, CO = 25µF, IO = 3A VI = 7.5 ± 3V RMS output noise voltage (% of TA = 25°C, f =10Hz to 10kHz VO) S Temperature stability S Long term stability TA = 125°C, 1000Hrs 0.008 60 0.04 %/W 72 dB 0.003 % 0.5 % 0.5 % 1. See short-circuit current curve for available output current at fixed dropout. 7/27 Electrical characteristics Table 5. Symbol LD1085xx Electrical characteristics of LD1085#18 (VI = 4.8 V, CI = CO =10 µF, TA = -40 to 125 °C, unless otherwise specified). Parameter Test condition Min. Typ. Max. Unit IO = 0 mA, TJ = 25°C 1.782 1.8 1.818 V IO = 0 to 3A, VI = 3.4 to 30V 1.764 1.8 1.836 V IO = 0 mA, VI = 3.4 to 18V TJ = 25°C 0.2 4 mV IO = 0 mA, VI = 3.4 to 15V 0.4 4 mV IO = 0 to 3A, TJ = 25°C 2 10 mV IO = 0 to 3A 4 20 mV VO Output voltage (1) ΔVO Line regulation ΔVO Load regulation Vd Dropout voltage IO = 3 A 1.3 1.5 V Iq Quiescent current VI ≤30V 5 10 mA Isc Short circuit current SVR eN VI - VO = 5V 3.2 4.5 A VI - VO = 25V 0.2 0.5 A Thermal regulation TA = 25°C, 30ms pulse Supply voltage rejection f = 120 Hz, CO = 25µF, IO = 3A VI = 7.5 ± 3V RMS output noise voltage (% of TA = 25°C, f =10Hz to 10kHz VO) S Temperature stability S Long term stability TA = 125°C, 1000Hrs 1. See short-circuit current curve for available output current at fixed dropout. 8/27 0.008 60 0.04 %/W 72 dB 0.003 % 0.5 % 0.5 % LD1085xx Table 6. Symbol Electrical characteristics Electrical characteristics of LD1085#25 (VI = 5.5 V, CI = CO =10 µF, TA = -40 to 125 °C, unless otherwise specified). Parameter Test condition Min. Typ. Max. Unit IO = 0 mA, TJ = 25°C 2.475 2.5 2.525 V IO = 0 to 3A, VI = 4.1 to 30V 2.45 2.5 2.55 V IO = 0 mA, VI = 4.1 to 18V, TJ = 25°C 0.2 4 mV IO = 0 mA, VI = 4.1 to 18V 0.4 4 mV IO = 0 to 3A, TJ = 25°C 2 10 mV IO = 0 to 3A 4 20 mV VO Output voltage (1) ΔVO Line regulation ΔVO Load regulation Vd Dropout voltage IO = 3A 1.3 1.5 V Iq Quiescent current VI ≤30V 5 10 mA Isc Short circuit current SVR eN VI - VO = 5V 3.2 4.5 A VI - VO = 25V 0.2 0.5 A Thermal regulation TA = 25°C, 30ms pulse Supply voltage rejection f = 120 Hz, CO = 25µF, IO = 3A VI = 7.5 ± 3V RMS output noise voltage (% of TA = 25°C, f =10Hz to 10kHz VO) S Temperature stability S Long term stability TA = 125°C, 1000Hrs 0.008 60 0.04 %/W 72 dB 0.003 % 0.5 % 0.5 % 1. See short-circuit current curve for available output current at fixed dropout. 9/27 Electrical characteristics Table 7. Symbol LD1085xx Electrical characteristics of LD1085#33 (VI = 6.3 V, CI = CO =10 µF, TA = -40 to 125 °C, unless otherwise specified). Parameter Test condition Min. Typ. Max. Unit IO = 0 mA, TJ = 25°C 3.267 3.3 3.333 V IO = 0 to 3A, VI = 4.9 to 30V 3.234 3.35 3.366 V 0.5 6 mV IO = 0 mA, VI = 4.9 to 18V 1 6 mV IO = 0 to 3A, TJ = 25°C 3 15 mV IO = 0 to 3A 7 20 mV VO Output voltage (1) ΔVO Line regulation ΔVO Load regulation Vd Dropout voltage IO = 3A 1.3 1.5 V Iq Quiescent current VI ≤30V 5 10 mA Isc Short circuit current SVR eN IO = 0 mA, VI = 4.9 to 18V, TJ = 25°C VI - VO = 5V 3.2 4.5 A VI - VO = 25V 0.2 0.5 A Thermal regulation TA = 25°C, 30ms pulse Supply voltage rejection f = 120 Hz, CO = 25µF, IO = 3A VI = 8.3 ± 3V RMS output noise voltage (% of TA = 25°C, f =10Hz to 10kHz VO) S Temperature stability S Long term stability TA = 125°C, 1000Hrs 1. See short-circuit current curve for available output current at fixed dropout. 10/27 0.008 60 0.04 %/W 72 dB 0.003 % 0.5 % 0.5 % LD1085xx Table 8. Symbol Electrical characteristics Electrical characteristics of LD1085#50 (VI = 8 V, CI = CO =10 µF, TA = -40 to 125 °C, unless otherwise specified). Parameter Test condition Min. Typ. Max. Unit IO = 0 mA, TJ = 25°C 4.95 5 5.05 V IO = 0 to 3A, VI = 6.6 to 30V 4.9 5 5.1 V 0.5 10 mV IO = 0 mA, VI = 6.6 to 20V 1 10 mV IO = 0 to 3A, TJ = 25°C 5 10 mV IO = 0 to 3A 10 35 mV VO Output voltage (1) ΔVO Line regulation ΔVO Load regulation Vd Dropout voltage IO = 3A 1.3 1.5 V Iq Quiescent current VI ≤30V 5 10 mA Isc Short circuit current SVR eN IO = 0 mA, VI = 6.6 to 20V, TJ = 25°C VI - VO = 5V 3.2 4.5 A VI - VO = 25V 0.2 0.5 A Thermal regulation TA = 25°C, 30ms pulse Supply voltage rejection f = 120 Hz, CO = 25µF, IO = 3A VI = 10 ± 3V RMS output noise voltage (% of TA = 25°C, f =10Hz to 10kHz VO) S Temperature stability S Long term stability TA = 125°C, 1000Hrs 0.008 60 0.04 %/W 72 dB 0.003 % 0.5 % 0.5 % 1. See short-circuit current curve for available output current at fixed dropout. 11/27 Electrical characteristics Table 9. Symbol VO ΔVO LD1085xx Electrical characteristics of LD1085# (VI = 4.25 V, CI = CO =10 µF, TA = -40 to 125 °C, unless otherwise specified). Parameter Test condition Output voltage (1) Line regulation Min. Typ. Max. Unit IO = 10mA TJ = 25°C 1.237 1.25 1.263 V IO = 10mA to 3A, VI = 2.85 to 30V 1.225 1.25 1.275 V IO = 10mA, VI = 2.85 to 16.5V, TJ = 25°C 0.015 0.2 % IO = 10mA, VI = 2.85 to 16.5V 0.035 0.2 % IO = 10mA to 3A, TJ = 25°C 0.1 0.3 % IO = 0 to 3A 0.2 0.4 % ΔVO Load regulation Vd Dropout voltage IO = 3A 1.3 1.5 V Minimum load current VI = 30V 3 10 mA IO(min) Isc Short circuit current VI - VO = 5V 5.5 6.5 A VI - VO = 25V 0.5 0.7 A Thermal regulation TA = 25°C, 30ms pulse SVR Supply voltage rejection f = 120 Hz, CO = 25µF,CADJ = 25 µF, IO = 3A, VI = 6.25 ± 3V IADJ Adjust pin current ΔIADJ eN Adjust pin current change (1) Temperature stability S Long term stability 72 dB 55 120 μA IO = 10mA to 3A, VI = 2.85 to 16.5V 0.2 5 μA TA = 125°C, 1000Hrs 1. See short-circuit current curve for available output current at fixed dropout. 12/27 60 %/W VI = 4.25V, IO = 10 mA RMS output noise voltage (% of TA = 25°C, f =10Hz to 10kHz VO) S 0.003 0.015 0.003 % 0.5 % 0.5 % LD1085xx Typical application 6 Typical application Figure 4. (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 13/27 Typical application LD1085xx 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 14/27 LD1085xx Typical application 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 15/27 Typical application LD1085xx 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 16/27 LD1085xx 7 Package mechanical data 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. 17/27 Package mechanical data LD1085xx TO-220 mechanical data Dim. mm. Min. Typ. inch. Max. Min. Typ. Max. 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 0.107 0.70 0.019 0.027 D1 E 1.27 0.49 0.050 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 0.409 L2 16.4 0.645 L4 13.0 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 18/27 LD1085xx Package mechanical data TO-220FP mechanical data Dim. mm. Min. Max. Min. A 4.40 4.60 0.173 0.181 B 2.5 2.7 0.098 0.106 D 2.5 2.75 0.098 0.108 E 0.45 0.70 0.017 0.027 F 0.75 1 0.030 0.039 F1 1.15 1.50 0.045 0.059 F2 1.15 1.50 0.045 0.059 G 4.95 5.2 0.194 0.204 G1 2.4 2.7 0.094 0.106 H 10.0 10.40 0.393 0.409 L2 Typ inch. 16 Typ. Max. 0.630 L3 28.6 30.6 1.126 1.204 L4 9.8 10.6 0.385 0.417 L5 2.9 3.6 0.114 0.142 L6 15.9 16.4 0.626 0.645 L7 9 9.3 0.354 0.366 DIA. 3 3.2 0.118 0.126 7012510A-H 19/27 Package mechanical data LD1085xx DPAK mechanical data mm. inch. Dim. Min. A A1 A2 B b4 C C2 D D1 E E1 e e1 H L (L1) L2 L4 R V2 Typ. 2.2 0.9 0.03 0.64 5.2 0.45 0.48 6 Max. Min. 2.4 1.1 0.23 0.9 5.4 0.6 0.6 6.2 0.086 0.035 0.001 0.025 0.204 0.017 0.019 0.236 6.6 0.252 5.1 6.4 0.260 0.173 0.368 0.039 2.8 0.8 0.181 0.397 0.110 0.031 1 0.023 0.2 0° 0.094 0.043 0.009 0.035 0.212 0.023 0.023 0.244 0.185 0.090 4.6 10.1 0.6 Max. 0.200 4.7 2.28 4.4 9.35 1 Typ. 0.039 0.008 8° 0° 8° 0068772-F 20/27 LD1085xx Package mechanical data D2PAK mechanical data mm. inch. Dim. Min. Typ. Max. Min. Typ. Max. A 4.4 4.6 0.173 0.181 A1 2.49 2.69 0.098 0.106 A2 0.03 0.23 0.001 0.009 B 0.7 0.93 0.027 0.036 B2 1.14 1.7 0.044 0.067 C 0.45 0.6 0.017 0.023 C2 1.23 1.36 0.048 0.053 D 8.95 9.35 0.352 0.368 10.4 0.393 D1 E 8 10 E1 0.315 8.5 0.409 0.335 G 4.88 5.28 0.192 0.208 L 15 15.85 0.590 0.624 L2 1.27 1.4 0.050 0.055 L3 1.4 1.75 0.055 0.068 M 2.4 3.2 0.094 R V2 0.4 0° 0.126 0.016 8° 0° 8° P011P6G 21/27 Package mechanical data LD1085xx D2PAK/A mechanical data mm. inch. Dim. Min. Typ. Max. Min. Typ. Max. A 4.40 4.60 0.173 0.181 A1 2.49 2.69 0.098 0.106 A2 0.03 0.23 0.001 0.009 B 0.7 0.93 0.028 0.037 B1 0.8 1.3 0.031 0.051 B2 1.14 1.7 0.045 0.067 C 0.45 0.60 0.018 0.024 C2 1.23 1.36 0.048 0.054 D 8.95 9.35 0.352 0.368 10.4 0.394 D1 E 8 10 E1 0.315 8.5 0.409 0.335 G 4.88 5.28 0.192 0.208 L 15 15.85 0.591 0.624 L2 1.27 1.4 0.050 0.055 M 2.4 3.2 0.094 R V2 0.4 0° 0.126 0.016 8° 0° 8° 7106164/D 22/27 LD1085xx Package mechanical data Tape & reel DPAK-PPAK mechanical data mm. inch. Dim. Min. Typ. A Max. Min. Typ. 330 13.0 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 13.2 Max. 0.504 0.512 22.4 0.519 0.882 Ao 6.80 6.90 7.00 0.268 0.272 0.2.76 Bo 10.40 10.50 10.60 0.409 0.413 0.417 Ko 2.55 2.65 2.75 0.100 0.104 0.105 Po 3.9 4.0 4.1 0.153 0.157 0.161 P 7.9 8.0 8.1 0.311 0.315 0.319 23/27 Package mechanical data LD1085xx Tape & reel D2PAK-P2PAK-D2PAK/A-P2PAK/A mechanical data mm. inch. Dim. Min. Typ. A Min. Typ. 180 13.0 13.2 Max. 7.086 C 12.8 D 20.2 0.795 N 60 2.362 T 24/27 Max. 0.504 0.512 14.4 0.519 0.567 Ao 10.50 10.6 10.70 0.413 0.417 0.421 Bo 15.70 15.80 15.90 0.618 0.622 0.626 Ko 4.80 4.90 5.00 0.189 0.193 0.197 Po 3.9 4.0 4.1 0.153 0.157 0.161 P 11.9 12.0 12.1 0.468 0.472 0.476 LD1085xx Order codes 8 Order codes Table 10. Order codes Packages TO-220 TO-220FP D2 PAK DPAK (T&R) 2 D PAK/A 2 D PAK/A (T&R) LD1085DT15R LD1085V18 LD1085D2T18R LD1085V25 LD1085V33 LD1085D2T33R 1.5 V LD1085DT18R LD1085D2M18R 1.8 V LD1085DT25R LD1085D2M25R 2.5 V LD1085DT33R LD1085D2M33R 3.3 V LD1085V50 LD1085V Output voltage 5.0 V LD1085P LD1085D2T-R LD1085D2M LD1085D2M-R ADJ 25/27 Revision history LD1085xx 9 Revision history Table 11. Document revision history Date Revision 07-Oct-2004 12 Mistake order codes - Table 1. 08-Feb-2005 13 Mistake U.M. load regulation - V ==> mV. 01-Mar-2005 14 Version 1.2 V removed. 22-May-2006 15 Order codes updated. 10-Nov-2006 16 Add package DPAK, typo on VO test value in tables 3, 4 and 11. 04-Apr-2007 17 Order codes updated. 07-Jun-2007 18 Order codes updated. 05-Dec-2007 19 Modified: Table 10. 26/27 Changes LD1085xx Please Read Carefully: Information in this document is provided solely in connection with ST products. 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