LM2931XX - LM2931AXX33 LM2931AXX50 - LM2931BXX50 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 & 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 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 battery powered systems. In the 8 pin configuration (SO8), fully compatible to the older L78Lxx family, a shut down logic control function is available. board in stand-by decreasing the total power consumption. Ideal for automotive application the LM2931xx is protected from reverse battery installations or 2 battery jumps. During the transient, such as a a load dump (60 V) when the input voltage can exceed the specified maximum operating input voltage (26 V), the regulator will automatically shut down to protect both internal circuit and the load. This means that when the device is used as a local regulator is possible to put a part of the Table 1. Device summary Order codes Packages DPAK LM2931ADT50R TO-92 (BAG) Output voltage TO-92 (Ammopak) (1) SO-8 LM2931AZ33R LM2931AD33R 3.3 V LM2931AZ50R LM2931AD50R 5.0 V LM2931BD50R 5.0 V LM2931D-R 2.5 to 26 V LM2931BZ50R LM2931BZ50AP 1. Please note that in these cases pins are shaped according to tape & reel specifications. July 2008 Rev 18 1/23 www.st.com 23 Contents LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50 Contents 1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5 Application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6 Timing diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8 Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2/23 LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50 1 Diagram Figure 1. Schematic diagram Diagram 3/23 Pin configuration LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50 2 Pin configuration Figure 2. Pin connections (top view) DPAK SO-8 PIN 1 = VOUT PIN 2 = GND PIN 3 = VIN TO-92 4/23 BOTTOM VIEW LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50 3 Maximum ratings Maximum ratings Table 2. Absolute maximum ratings Symbol Parameter Value Unit VI DC positive input voltage 40 V VI DC reverse input voltage -15 V VI Transient input voltage (τ < 100 ms) 60 V VI Transient reverse input voltage (τ < 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 Parameter RthJC Thermal resistance junction-case RthJA 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. 5/23 Application circuits LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50 4 Application circuits Figure 3. Application circuit for fixed output Figure 4. Application circuit for adjustable output R1 suggested value = 27 kΩ VO = VREF (R1 + R2)/R1 6/23 LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50 Electrical characteristics 5 Electrical characteristics Table 4. Electrical characteristics of LM2931Axx33 (refer to the application circuit Figure 3, TJ = 25 °C, CI = 0.1 µF, CO = 100 µF, VI = 14 V, IO = 10 mA, VINH = 0 V, unless otherwise specified). Symbol Parameter Min. Typ. 26 37 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 Ω 0.3 1 mA VI Maximum operating input voltage VO Output voltage VO Output voltage ΔVO Line regulation ΔVO Load regulation Vd Id ISC Dropout voltage (1) (2) Test conditions IO = 10 mA, TJ = -40 to 125°C IO = 100 mA, VI = 6 to 26 V TJ = -40 to 125°C Short circuit current Max. Unit V 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 125°C VIL Control input voltage low TJ = -40 to 125°C VIH Control input voltage high TJ = -40 to 125°C IINH Inhibit input current VINH = 2.5 V VI Transient input voltage RLOAD = 330 Ω, τ < 100ms 60 70 V VI Reverse polarity input voltage VO = ± 0.3 V, RLOAD = 330 Ω -15 -50 V VI Reverse polarity input voltage transient RLOAD = 330 Ω, τ < 100ms -50 eN Output noise voltage B =10 Hz to 100 kHz 2 3.25 1.2 2 22 V V 50 µA V 330 µVRMS 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. 7/23 Electrical characteristics Table 5. Symbol Electrical characteristics of LM2931Axx50 (refer to the application circuit Figure 3, TJ = 25 °C, CI = 0.1 µF, CO = 100 µF, VI = 14 V, IO = 10 mA, VINH = 0 V, unless otherwise specified). Parameter Min. Typ. 26 37 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 Ω 0.3 1 mA VI Maximum operating input voltage VO Output voltage VO Output voltage ΔVO Line regulation ΔVO Load regulation Vd Id ISC LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50 Dropout voltage (1) (2) Test conditions IO = 10 mA, TJ = -40 to 125°C IO = 100 mA, VI = 6 to 26 V TJ = -40 to 125°C Short circuit current Max. Unit V 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 125°C VIL Control input voltage low TJ = -40 to 125°C VIH Control input voltage high TJ = -40 to 125°C IINH Inhibit input current VINH = 2.5 V VI Transient input voltage RLOAD = 500 Ω, τ < 100ms 60 70 V VI Reverse polarity input voltage VO = ± 0.3 V, RLOAD = 500 Ω -15 -50 V VI Reverse polarity input voltage transient RLOAD = 500 Ω, τ < 100ms -50 eN Output noise voltage B =10 Hz to 100 kHz 2 3.25 2 22 V V 50 µA V 500 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. 8/23 1.2 µVRMS LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50 Table 6. Symbol Electrical characteristics of LM2931Bxx50 (refer to the application circuit Figure 3, TJ = 25 °C, CI = 0.1 µF, CO = 100 µF, VI = 14 V, IO = 10 mA, VINH = 0 V, unless otherwise specified). Parameter Min. Typ. 26 37 4.75 5 5.25 V 4.5 5 5.5 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 Ω 0.3 1 mA VI Maximum operating input voltage VO Output voltage VO Output voltage ΔVO Line regulation ΔVO Load regulation Vd Id ISC Electrical characteristics Dropout voltage (1) (2) Test conditions IO = 10 mA, TJ = -40 to 125°C IO = 100 mA, VI = 6 to 26 V TJ = -40 to 125°C Short circuit current Max. Unit V 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 125°C VIL Control input voltage low TJ = -40 to 125°C VIH Control input voltage high TJ = -40 to 125°C IINH Inhibit input current VINH = 2.5 V VI Transient input voltage RLOAD = 500 Ω, τ < 100ms 60 70 V VI Reverse polarity input voltage VO = ± 0.3 V, RLOAD = 500 Ω -15 -50 V VI Reverse polarity input voltage transient RLOAD = 500 Ω, τ < 100ms -50 eN Output noise voltage B =10 Hz to 100 kHz 2 3.25 1.2 2 22 V V 50 µA V 500 µVRMS 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. 9/23 Electrical characteristics Table 7. Symbol VI LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50 Electrical characteristics of LM2931xx (refer to the application circuit Figure 4 with R1 = 27 KΩ and R2 = 40.5 kΩ, TJ = 25 °C, CI = 0.1 µF, CO = 100 µF, VI = 14 V, IO = 10 mA, VINH = 0 V, unless otherwise specified). Parameter Maximum operating input voltage Test conditions IO = 10 mA, TJ = -40 to 125°C Min. Typ. Max. Unit 26 37 1.14 1.2 1.26 V 1.08 1.2 1.32 V V VREF Reference voltage (1) VREF Reference voltage (1) ΔVO Line regulation VI = 3.6 to 26 V 0.6 4.5 mV ΔVO Load regulation 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 Ω 0.3 1 mA Vd Id ISC Dropout voltage (1) (2) IO = 100 mA, TJ = -40 to 125°C 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 125°C VIL Control input voltage low TJ = -40 to 125°C VIH Control input voltage high TJ = -40 to 125°C IINH Inhibit input current VINH = 2.5 V VI Transient input voltage RLOAD = 300 Ω, τ < 100ms 60 70 V VI Reverse polarity input voltage VO = ± 0.3 V, RLOAD = 300 Ω -15 -50 V VI Reverse polarity input voltage transient RLOAD = 300 Ω, τ < 100ms -50 eN Output noise voltage B = 10 Hz to 100 kHz 2 3.25 2 22 V V 50 µA V 330 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. 10/23 1.2 µVRMS LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50 Typical characteristics 6 Typical characteristics Figure 5. (unless otherwise specified CI = 0.1 µF, CO = 100 µF) 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 Line regulation vs temperature 11/23 Typical characteristics LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50 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 12/23 LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50 Typical characteristics 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 Ω, TJ = 25°C, CI = 0, CO = 100 µF, Rise Fall-Time = 200 ns 13/23 Typical characteristics LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50 Figure 23. Line transient VI = 14 V, IO = 100 mA, TJ = 25°C, CI = 0.1 µF, CO = 100 µF, Rise Time = 500 ns, Fall-Time = 1 µs 14/23 LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50 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. 15/23 Package mechanical data LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50 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 α 5° 5° 0102782/D 16/23 LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50 Package mechanical data 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 17/23 Package mechanical data LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50 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 18/23 LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50 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 19/23 Package mechanical data LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50 Tape & reel SO-8 mechanical data mm. inch. Dim. Min. A Max. Min. 330 13.2 Typ. Max. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 20/23 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 LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50 Package mechanical data Tape & reel for TO-92 mechanical data Dim. A1 T T1 T2 d P0 P2 F1, F2 delta H W W0 W1 W2 H H0 H1 D0 t L1 delta P u Φ1 Φ2 mm. Min. inch. Typ. Max. Min. 4.80 3.80 1.60 2.30 0.48 12.5 5.65 2.44 17.5 5.7 8.5 Typ. Max. 0.189 0.150 0.063 0.091 0.019 2.54 ±2 18.00 0.50 18.50 15.50 12.9 7.05 2.94 0.492 0.222 0.096 19.0 6.3 9.25 0.689 0.224 0.335 0.508 0.278 0.116 0.100 0.079 0.709 0.748 0.248 0.364 0.20 0.728 18.70 16.50 0.610 4.2 0.150 25.00 0.726 0.650 0.984 3.8 0.90 3 ±1 50 360 30 0.165 0.035 0.118 0.039 1.968 14.173 1.181 delta P T A1 T2 H1 T1 delta H H H0 d L W2 l1 W0 W W1 F1 F2 D0 P2 t P0 DRAWING NOT IN SCALE 21/23 Revision history LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50 8 Revision history Table 8. 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. 22/23 Changes LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50 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. 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