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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)
SO-8 DPAK TO-92
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. 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 TO-92 (BAG) LM2931AZ33R LM2931ADT50R LM2931AZ50R LM2931BZ50R
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.
Output voltage SO-8 LM2931AD33R LM2931AD50R 3.3 V 5.0 V 5.0 V 2.5 to 26 V
TO-92 (Ammopak) (1)
LM2931BZ50AP
LM2931BD50R LM2931D-R
1. Please note that in these cases pins are shaped according to tape & reel specifications.
July 2008
Rev 18
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Contents
LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50
Contents
1 2 3 4 5 6 7 8 9 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Timing diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
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LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50
Diagram
1
Figure 1.
Diagram
Schematic diagram
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Pin configuration
LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50
2
Figure 2.
Pin configuration
Pin connections (top view)
DPAK
SO-8 PIN 1 = VOUT PIN 2 = GND PIN 3 = VIN TO-92 BOTTOM VIEW
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LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50
Maximum ratings
3
Table 2.
Maximum ratings
Absolute maximum ratings
Parameter DC positive input voltage DC reverse input voltage Transient input voltage ( < 100 ms) Transient reverse input voltage ( < 100 ms) Inhibit input voltage Output current Storage temperature range Operating junction temperature range Value 40 -15 60 -50 40 Internally limited -65 to 150 -40 to 125 C C Unit V V V V V
Symbol VI VI VI VI VINH IO 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 SO-8 20 55
(1)
Table 3.
Symbol RthJC RthJA
DPAK 8 100
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
Figure 3.
Application circuits
Application circuit for fixed output
Figure 4.
Application circuit for adjustable output
R1 suggested value = 27 k VO = VREF (R1 + R2)/R1
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LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50
Electrical characteristics
5
Table 4.
Electrical characteristics
Electrical characteristics of LM2931Axx33 (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).
Parameter Maximum operating input voltage Output voltage Output voltage IO = 100 mA, VI = 6 to 26 V TJ = -40 to 125C VI = 9 to 16 V VI = 6 to 26 V Load regulation Dropout voltage (1) (2) Quiescent current ON MODE OFF MODE ISC SVR VIL VIH IINH VI VI VI eN Short circuit current Supply voltage rejection Control input voltage low Control input voltage high Inhibit input current Transient input voltage Reverse polarity input voltage Reverse polarity input voltage transient Output noise voltage IO = 100 mA, VI = 14 2 V f = 120 Hz, TJ = -40 to 125C TJ = -40 to 125C TJ = -40 to 125C VINH = 2.5 V RLOAD = 330 , < 100ms VO = 0.3 V, RLOAD = 330 RLOAD = 330 , < 100ms B =10 Hz to 100 kHz 60 -15 -50 330 3.25 IO = 5 to 100 mA IO = 10 mA IO = 100 mA IO = 100 mA VINH = 2.5 V, RLOAD = 330 100 55 Test conditions IO = 10 mA, TJ = -40 to 125C Min. 26 3.135 3.135 Typ. 37 3.3 3.3 2 4 10 90 250 2.5 0.3 300 78 2 2 22 70 -50 50 1.2 3.425 3.465 10 mV 33 33 250 mV 600 30 1 mA mA mA dB V V A V V V VRMS mV Max. Unit V V V
Symbol VI VO VO VO VO Vd
Line regulation
Id
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.
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Electrical characteristics
LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50
Table 5.
Electrical characteristics of 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).
Parameter Maximum operating input voltage Output voltage Output voltage IO = 100 mA, VI = 6 to 26 V TJ = -40 to 125C VI = 9 to 16 V VI = 6 to 26 V Load regulation Dropout voltage (1) (2) Quiescent current ON MODE OFF MODE IO = 5 to 100 mA IO = 10 mA IO = 100 mA IO = 100 mA VINH = 2.5 V, RLOAD = 500 100 IO = 100 mA, VI = 14 2 V f = 120 Hz, TJ = -40 to 125C TJ = -40 to 125C TJ = -40 to 125C VINH = 2.5 V RLOAD = 500 , < 100ms VO = 0.3 V, RLOAD = 500 RLOAD = 500 , < 100ms B =10 Hz to 100 kHz 60 -15 -50 500 3.25 55 Test conditions IO = 10 mA, TJ = -40 to 125C Min. 26 4.81 4.75 Typ. 37 5 5 2 4 15 90 250 2.5 0.3 300 75 2 2 22 70 -50 50 1.2 5.19 5.25 10 mV 30 50 200 mV 600 30 1 mA mA mA dB V V A V V V VRMS mV Max. Unit V V V
Symbol VI VO VO VO VO Vd
Line regulation
Id ISC SVR VIL VIH IINH VI VI VI eN
Short circuit current Supply voltage rejection Control input voltage low Control input voltage high Inhibit input current Transient input voltage Reverse polarity input voltage Reverse polarity input voltage transient Output noise voltage
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.
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LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50
Electrical characteristics
Table 6.
Electrical characteristics of LM2931Bxx50 (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).
Parameter Maximum operating input voltage Output voltage Output voltage IO = 100 mA, VI = 6 to 26 V TJ = -40 to 125C VI = 9 to 16 V VI = 6 to 26 V Load regulation Dropout voltage (1) (2) Quiescent current ON MODE OFF MODE IO = 5 to 100 mA IO = 10 mA IO = 100 mA IO = 100 mA VINH = 2.5 V, RLOAD = 500 100 IO = 100 mA, VI = 14 2 V f = 120 Hz, TJ = -40 to 125C TJ = -40 to 125C TJ = -40 to 125C VINH = 2.5 V RLOAD = 500 , < 100ms VO = 0.3 V, RLOAD = 500 RLOAD = 500 , < 100ms B =10 Hz to 100 kHz 60 -15 -50 500 3.25 55 Test conditions IO = 10 mA, TJ = -40 to 125C Min. 26 4.75 4.5 Typ. 37 5 5 2 4 15 90 250 2.5 0.3 300 75 2 2 22 70 -50 50 1.2 5.25 5.5 10 mV 30 50 200 mV 600 30 1 mA mA mA dB V V A V V V VRMS mV Max. Unit V V V
Symbol VI VO VO VO VO Vd
Line regulation
Id ISC SVR VIL VIH IINH VI VI VI eN
Short circuit current Supply voltage rejection Control input voltage low Control input voltage high Inhibit input current Transient input voltage Reverse polarity input voltage Reverse polarity input voltage transient Output noise voltage
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.
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Electrical characteristics
LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50
Table 7.
Electrical characteristics of LM2931xx (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).
Parameter Maximum operating input voltage Reference voltage (1) Reference voltage (1) Line regulation Load regulation Dropout voltage (1) (2) Quiescent current ON MODE OFF MODE IO = 100 mA, TJ = -40 to 125C VI = 3.6 to 26 V IO = 5 to 100 mA IO = 10 mA IO = 100 mA IO = 100 mA VINH = 2.5 V, RLOAD = 300 100 IO = 100 mA, VI = 14 2 V f = 120 Hz, TJ = -40 to 125C TJ = -40 to 125C TJ = -40 to 125C VINH = 2.5 V RLOAD = 300 , < 100ms VO = 0.3 V, RLOAD = 300 RLOAD = 300 , < 100ms B = 10 Hz to 100 kHz 60 -15 -50 330 3.25 55 Test conditions IO = 10 mA, TJ = -40 to 125C Min. 26 1.14 1.08 Typ. 37 1.2 1.2 0.6 9 90 250 2.5 0.3 300 80 2 2 22 70 -50 50 1.2 1.26 1.32 4.5 30 200 mV 600 30 1 mA mA mA dB V V A V V V VRMS Max. Unit V V V mV mV
Symbol VI VREF VREF VO VO Vd
Id ISC SVR VIL VIH IINH VI VI VI eN
Short circuit current Supply voltage rejection Control input voltage low Control input voltage high Inhibit input current Transient input voltage Reverse polarity input voltage Reverse polarity input voltage transient Output noise voltage
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.
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LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50
Typical characteristics
6
Figure 5.
Typical characteristics
(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.
Line regulation vs temperature
Figure 9.
Load regulation vs temperature
Figure 10. Dropout voltage vs temperature
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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
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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 , TJ = 25C, CI = 0, CO = 100 F, Rise Fall-Time = 200 ns
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Typical characteristics
LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50
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
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LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50
Package mechanical data
7
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) 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.
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Package mechanical data
LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50
TO-92 mechanical data
mm. Dim. Min. A b D E e e1 L R S1 W 4.32 0.36 4.45 3.30 2.41 1.14 12.7 2.16 0.92 0.41 5 Typ. Max. 4.95 0.51 4.95 3.94 2.67 1.40 15.49 2.41 1.52 0.56 Min. 170.1 14.2 175.2 129.9 94.9 44.9 500.0 85.0 36.2 16.1 5 Typ. Max. 194.9 20.1 194.9 155.1 105.1 55.1 609.8 94.9 59.8 22.0 mils.
0102782/D
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LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50
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
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Package mechanical data
LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50
SO-8 mechanical data
Dim. A A1 A2 B C D E e H h L k ddd 0.1 5.80 0.25 0.40 mm. Min. 1.35 0.10 1.10 0.33 0.19 4.80 3.80 1.27 6.20 0.50 1.27 8 (max.) 0.04 0.228 0.010 0.016 Typ. Max. 1.75 0.25 1.65 0.51 0.25 5.00 4.00 Min. 0.053 0.04 0.043 0.013 0.007 0.189 0.150 0.050 0.244 0.020 0.050 inch. Typ. Max. 0.069 0.010 0.065 0.020 0.010 0.197 0.157
0016023/C
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LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50
Package mechanical data
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.
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Package mechanical data
LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50
Tape & reel SO-8 mechanical data
mm. Dim. Min. A C D N T Ao Bo Ko Po P 8.1 5.5 2.1 3.9 7.9 12.8 20.2 60 22.4 8.5 5.9 2.3 4.1 8.1 0.319 0.216 0.082 0.153 0.311 Typ. Max. 330 13.2 0.504 0.795 2.362 0.882 0.335 0.232 0.090 0.161 0.319 Min. Typ. Max. 12.992 0.519 inch.
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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 1 2 mm. Min. Typ. 4.80 3.80 1.60 2.30 0.48 12.5 5.65 2.44 17.5 5.7 8.5 12.9 7.05 2.94 19.0 6.3 9.25 18.70 16.50 4.2 0.90 3 1 50 360 30
delta P A1 H1 H H0 L l1 W0 W W1 F1 F2 P2 P0 d W2 delta H T2
inch. Max. Min. Typ. 0.189 0.150 0.063 0.091 0.019 0.492 0.222 0.096 0.689 0.224 0.335 0.508 0.278 0.116 0.748 0.248 0.364 0.726 0.650 0.165 0.035 0.118 0.039 1.968 14.173 1.181
T T1
Max.
2.54 2 18.00
0.100 0.079 0.709
0.50 18.50 15.50 25.00 3.8
0.20 0.728 0.610 0.984 0.150
D0
t
DRAWING NOT IN SCALE
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Revision history
LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50
8
Table 8.
Date
Revision history
Document revision history
Revision 12 13 14 15 16 17 18 Document updated. Order codes updated. Added Table 1 in cover page. Added root part number - (see Table 1) Modified: Table 1. Modified: Table 1 on page 1. Removed package TO-220, modified Table 1 on page 1. Changes
21-Jun-2004 16-Jun-2006 27-Jul-2007 21-Aug-2007 22-Nov-2007 11-Feb-2008 10-Jul-2008
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LM2931XX - LM2931AXX33 - LM2931AXX50 - LM2931BXX50
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