LM2931XX, LM2931AXX33 LM2931AXX50 Very low drop voltage regulators with inhibit function Features Very low dropout voltage (0.15 V typ. at 10 mA load) Low quiescent current (typ. 2.5 mA, at 100 mA load) Output current up to 100 mA Adjustable (from VOUT = 2.5 V only SO-8) and fixed (3.3 V and 5 V) output voltage version Internal current and thermal limit Load dump protection up to 60 V Reverse transient protection up to - 50 V Temperature range: - 40 to 125 C Package available: TO-92, DPAK, SO-8 (with inhibit control) DPAK TO-92 SO-8 Description operating input voltage of 26 V, the regulator automatically shuts down to protect both internal circuitry and the load. The LM2931xx are very low drop regulators. The very low drop voltage and the low quiescent current make them particular suitable for low noise, low power applications and in batterypowered systems. In the 8-pin configuration (SO-8), fully compatible with the older L78Lxx family, a shutdown logic control function is available. This means that when the device is used as a local regulator it is possible to put a part of the board in standby, decreasing total power consumption. Ideal for automotive applications, LM2931xx is protected from reverse battery installations or 2 battery jumps. During the transient, such as a 60 V load dump, when the input voltage can exceed the specified maximum Table 1. Device summary Order codes Output voltages DPAK LM2931ADT50R November 2011 TO-92 (Bag) LM2931AZ50R SO-8 LM2931AD33R 3.3 V LM2931AD50R 5.0 V LM2931D-R 2.5 to 26 V Doc ID 6740 Rev 20 1/21 www.st.com 21 Contents LM2931XX, LM2931AXX33, LM2931AXX50 Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2/21 Doc ID 6740 Rev 20 LM2931XX, LM2931AXX33, LM2931AXX50 1 Diagram Figure 1. Schematic diagram Doc ID 6740 Rev 20 Diagram 3/21 Pin configuration LM2931XX, LM2931AXX33, LM2931AXX50 2 Pin configuration Figure 2. Pin connections (top view) DPAK SO-8 PIN 1 = VOUT PIN 2 = GND PIN 3 = VIN TO-92 BOTTOM VIEW (*) ADJ pin on the Adjustable version, Not Connected in the fixed output version. 4/21 Doc ID 6740 Rev 20 LM2931XX, LM2931AXX33, LM2931AXX50 3 Maximum ratings Table 2. Absolute maximum ratings Symbol Maximum ratings Parameter Value Unit VI DC positive input voltage 40 V VI DC reverse input voltage -15 V VI Transient input voltage ( < 100 ms) 60 V VI Transient reverse input voltage ( < 100 ms) -50 V Inhibit input voltage 40 V VINH IO Output current Internally limited TSTG Storage temperature range -65 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 RthJC RthJA Parameter Thermal resistance junction-case Thermal resistance junction-ambient SO-8 DPAK 20 8 55 (1) 100 TO-92 Unit C/W 200 C/W 1. Considering 6 cm2 of copper board heat-sink. Doc ID 6740 Rev 20 5/21 Application circuits LM2931XX, LM2931AXX33, LM2931AXX50 4 Application circuits Figure 3. Application circuit for fixed output Figure 4. Application circuit for adjustable output Note: R1 suggested value = 27 k VO = VREF (R1 + R2)/R1 Inhibit pin: regulator is enabled when VINH < 1.2 V , disabled when VINH > 3.25 V 6/21 Doc ID 6740 Rev 20 LM2931XX, LM2931AXX33, LM2931AXX50 5 Electrical characteristics Electrical characteristics Refer to the application circuit Figure 3, TJ = 25 C, CI = 0.1 F, CO = 100 F, VI = 14 V, IO = 10 mA, VINH = 0 V, unless otherwise specified. Table 4. Symbol Electrical characteristics of LM2931Axx33 Parameter VI Maximum operating input voltage VO Output voltage VO Output voltage VO Line regulation VO Load regulation Vd Id ISC Test conditions IO = 10 mA, TJ = -40 to 125C Min. Typ. Max. 26 Unit V 3.135 3.3 3.425 V 3.135 3.3 3.465 V VI = 9 to 16 V 2 10 VI = 6 to 26 V 4 33 IO = 5 to 100 mA 10 33 IO = 10 mA 90 250 IO = 100 mA 250 600 Quiescent current ON MODE IO = 100 mA 2.5 30 mA OFF MODE VINH = 2.5 V, RLOAD = 330 0.3 1 mA Dropout voltage (1) (2) IO = 100 mA, VI = 6 to 26 V TJ = -40 to 125C Short circuit current mV mV mV 100 300 mA 55 78 dB SVR Supply voltage rejection IO = 100 mA, VI = 14 2 V f = 120 Hz, TJ = -40 to 125C VIL Control input voltage low TJ = -40 to 125C VIH Control input voltage high TJ = -40 to 125C IINH Inhibit input current VINH = 2.5 V VI Transient input voltage RLOAD = 330 , < 100ms 60 70 V VI Reverse polarity input voltage VO = 0.3 V, RLOAD = 330 -15 -50 V VI Reverse polarity input voltage transient RLOAD = 330 , < 100ms -50 eN Output noise voltage B =10 Hz to 100 kHz 2 3.25 1.2 2 22 V V 50 A V 330 VRMS 1. Reference voltage is measured from VOUT to ADJ pin. 2. Vd measured when the output voltage has dropped 100 mV from the nominal value obtained at 14 V. Doc ID 6740 Rev 20 7/21 Electrical characteristics LM2931XX, LM2931AXX33, LM2931AXX50 Refer to the application circuit Figure 3, TJ = 25 C, CI = 0.1 F, CO = 100 F, VI = 14 V, IO = 10 mA, VINH = 0 V, unless otherwise specified. Table 5. Symbol Electrical characteristics of LM2931Axx50 Parameter VI Maximum operating input voltage VO Output voltage VO Output voltage VO Line regulation VO Load regulation Vd Id ISC Test conditions IO = 10 mA, TJ = -40 to 125C Min. Typ. Max. 26 Unit V 4.81 5 5.19 V 4.75 5 5.25 V VI = 9 to 16 V 2 10 VI = 6 to 26 V 4 30 IO = 5 to 100 mA 15 50 IO = 10 mA 90 200 IO = 100 mA 250 600 Quiescent current ON MODE IO = 100 mA 2.5 30 mA OFF MODE VINH = 2.5 V, RLOAD = 500 0.3 1 mA Dropout voltage (1) (2) IO = 100 mA, VI = 6 to 26 V TJ = -40 to 125C Short circuit current mV mV mV 100 300 mA 55 75 dB SVR Supply voltage rejection IO = 100 mA, VI = 14 2 V f = 120 Hz, TJ = -40 to 125C VIL Control input voltage low TJ = -40 to 125C VIH Control input voltage high TJ = -40 to 125C IINH Inhibit input current VINH = 2.5 V VI Transient input voltage RLOAD = 500 , < 100ms 60 70 V VI Reverse polarity input voltage VO = 0.3 V, RLOAD = 500 -15 -50 V VI Reverse polarity input voltage transient RLOAD = 500 , < 100ms -50 eN Output noise voltage B =10 Hz to 100 kHz 2 3.25 2 22 500 2. Vd measured when the output voltage has dropped 100 mV from the nominal value obtained at 14 V. Doc ID 6740 Rev 20 V V 50 A V 1. Reference voltage is measured from VOUT to ADJ pin. 8/21 1.2 VRMS LM2931XX, LM2931AXX33, LM2931AXX50 Electrical characteristics Refer to the application circuit Figure 4 with R1 = 27 K and R2 = 40.5 k, TJ = 25 C, CI = 0.1 F, CO = 100 F, VI = 14 V, IO = 10 mA, VINH = 0 V, unless otherwise specified. Table 6. Symbol VI Electrical characteristics of LM2931xx Parameter Maximum operating input voltage Test conditions IO = 10 mA, TJ = -40 to 125C VREF Reference voltage (1) VREF Reference voltage (1) IO = 100 mA, TJ = -40 to 125C VO Line regulation VO Load regulation Vd Id ISC Min. Typ. Max. 26 Unit V 1.14 1.2 1.26 V 1.08 1.2 1.32 V VI = 3.6 to 26 V 0.6 4.5 mV IO = 5 to 100 mA 9 30 mV IO = 10 mA 90 200 IO = 100 mA 250 600 Quiescent current ON MODE IO = 100 mA 2.5 30 mA OFF MODE VINH = 2.5 V, RLOAD = 300 0.3 1 mA Dropout voltage (1) (2) Short circuit current mV 100 300 mA 55 80 dB SVR Supply voltage rejection IO = 100 mA, VI = 14 2 V f = 120 Hz, TJ = -40 to 125C VIL Control input voltage low TJ = -40 to 125C VIH Control input voltage high TJ = -40 to 125C IINH Inhibit input current VINH = 2.5 V VI Transient input voltage RLOAD = 300 , < 100ms 60 70 V VI Reverse polarity input voltage VO = 0.3 V, RLOAD = 300 -15 -50 V VI Reverse polarity input voltage transient RLOAD = 300 , < 100ms -50 eN Output noise voltage B = 10 Hz to 100 kHz 2 3.25 1.2 2 22 V V 50 A V 330 VRMS 1. Reference voltage is measured from VOUT to ADJ pin. 2. Vd measured when the output voltage has dropped 100 mV from the nominal value obtained at 14 V. Doc ID 6740 Rev 20 9/21 Typical characteristics LM2931XX, LM2931AXX33, LM2931AXX50 6 Typical characteristics Figure 5. Unless otherwise specified CI = 0.1 F, CO = 100 F. Output voltage vs. temperature Figure 6. Output voltage vs. temperature Figure 7. Reference voltage vs. temperature Figure 8. Figure 9. Load regulation vs. temperature Figure 10. Dropout voltage vs. temperature 10/21 Doc ID 6740 Rev 20 Line regulation vs. temperature LM2931XX, LM2931AXX33, LM2931AXX50 Typical characteristics Figure 11. Dropout voltage vs. temperature Figure 12. Dropout voltage vs. output current Figure 13. Output voltage vs. input voltage Figure 14. Short circuit current vs. drop voltage Figure 15. Quiescent current vs. temperature Figure 16. Quiescent current vs. input voltage Doc ID 6740 Rev 20 11/21 Typical characteristics LM2931XX, LM2931AXX33, LM2931AXX50 Figure 17. Quiescent current vs. output current Figure 18. Supply voltage rejection vs. temperature Figure 19. Supply voltage rejection vs. frequency Figure 20. Supply voltage rejection vs. output current Figure 21. Stability vs. CO Figure 22. Line transient VI = 6 to 20 V, RL = 500 , TJ = 25C, CI = 0, CO = 100 F, Rise Fall-Time = 200 ns 12/21 Doc ID 6740 Rev 20 LM2931XX, LM2931AXX33, LM2931AXX50 Typical characteristics Figure 23. Line transient VI = 14 V, IO = 100 mA, TJ = 25C, CI = 0.1 F, CO = 100 F, Rise Time = 500 ns, Fall-Time = 1 s Doc ID 6740 Rev 20 13/21 Package mechanical data 7 LM2931XX, LM2931AXX33, LM2931AXX50 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) is an ST trademark. 14/21 Doc ID 6740 Rev 20 LM2931XX, LM2931AXX33, LM2931AXX50 Package mechanical data TO-92 mechanical data mm. mils. Dim. Min. Typ. Max. Min. Typ. Max. A 4.32 4.95 170.1 194.9 b 0.36 0.51 14.2 20.1 D 4.45 4.95 175.2 194.9 E 3.30 3.94 129.9 155.1 e 2.41 2.67 94.9 105.1 e1 1.14 1.40 44.9 55.1 L 12.7 15.49 500.0 609.8 R 2.16 2.41 85.0 94.9 S1 0.92 1.52 36.2 59.8 W 0.41 0.56 16.1 22.0 5 5 0102782/D Doc ID 6740 Rev 20 15/21 Package mechanical data LM2931XX, LM2931AXX33, LM2931AXX50 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 16/21 Doc ID 6740 Rev 20 LM2931XX, LM2931AXX33, LM2931AXX50 Package mechanical data SO-8 mechanical data Dim. mm. Min. Typ. inch. Max. Min. Typ. Max. A 1.35 1.75 0.053 0.069 A1 0.10 0.25 0.04 0.010 A2 1.10 1.65 0.043 0.065 B 0.33 0.51 0.013 0.020 C 0.19 0.25 0.007 0.010 D 4.80 5.00 0.189 0.197 E 3.80 4.00 0.150 0.157 e 1.27 0.050 H 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 k ddd 8 (max.) 0.1 0.04 0016023/C Doc ID 6740 Rev 20 17/21 Package mechanical data LM2931XX, LM2931AXX33, LM2931AXX50 Tape & reel DPAK-PPAK mechanical data mm. inch. Dim. Min. Typ. A Min. Typ. 330 13.0 13.2 Max. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 18/21 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 Doc ID 6740 Rev 20 LM2931XX, LM2931AXX33, LM2931AXX50 Package mechanical data Tape & reel SO-8 mechanical data mm. inch. Dim. Min. A Typ. Max. Min. 330 Max. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 13.2 Typ. 0.504 22.4 0.519 0.882 Ao 8.1 8.5 0.319 0.335 Bo 5.5 5.9 0.216 0.232 Ko 2.1 2.3 0.082 0.090 Po 3.9 4.1 0.153 0.161 P 7.9 8.1 0.311 0.319 Doc ID 6740 Rev 20 19/21 Revision history LM2931XX, LM2931AXX33, LM2931AXX50 8 Revision history Table 7. Document revision history Date Revision 21-Jun-2004 12 Document updated. 16-Jun-2006 13 Order codes updated. 27-Jul-2007 14 Added Table 1 in cover page. 21-Aug-2007 15 Added root part number - (see Table 1). 22-Nov-2007 16 Modified: Table 1. 11-Feb-2008 17 Modified: Table 1 on page 1. 10-Jul-2008 18 Removed package TO-220, modified Table 1 on page 1. 26-May-2010 19 Modified: VI values Table 4 on page 7, Table 5 on page 8 and Table 6 on page 9. 20 Modified: Figure 4 on page 6. Added: (*) ADJ pin on the Adjustable version, Not Connected in the fixed output version. on page 4 and Inhibit pin: regulator is enabled when VINH < 1.2 V , disabled when VINH > 3.25 V on page 6. 02-Nov-2011 20/21 Changes Doc ID 6740 Rev 20 LM2931XX, LM2931AXX33, LM2931AXX50 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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