Datasheet

ManualsBrandsSTMICROELECTRONICS ManualsVoltage RegulatorsLM2931ADT50R

November 2011 Doc ID 6740 Rev 20 1/21

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 V

OUT

= 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)

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

(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

operating input voltage of 26 V, the regulator

automatically shuts down to protect both internal

circuitry and the load.

TO-92

DPAK

SO-8

Table 1. Device summary

Order codes

Output voltages

DPAK TO-92 (Bag) SO-8

LM2931AD33R 3.3 V

LM2931ADT50R LM2931AZ50R LM2931AD50R 5.0 V

LM2931D-R 2.5 to 26 V

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Summary of content (21 pages)

PAGE 1
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.
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Contents LM2931XX, LM2931AXX33, LM2931AXX50 Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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LM2931XX, LM2931AXX33, LM2931AXX50 1 Diagram Figure 1.
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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.
PAGE 5
LM2931XX, LM2931AXX33, LM2931AXX50 3 Maximum ratings Table 2.
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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 kΩ VO = VREF (R1 + R2)/R1 Inhibit pin: regulator is enabled when VINH < 1.2 V , disabled when VINH > 3.
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LM2931XX, LM2931AXX33, LM2931AXX50 5 Electrical characteristics Electrical characteristics 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. Table 4. Symbol Electrical characteristics of LM2931Axx33 Parameter VI Maximum operating input voltage VO Output voltage VO Output voltage ΔVO Line regulation ΔVO Load regulation Vd Id ISC Test conditions IO = 10 mA, TJ = -40 to 125°C Min. Typ. Max.
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Electrical characteristics LM2931XX, LM2931AXX33, 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. Table 5. Symbol Electrical characteristics of LM2931Axx50 Parameter VI Maximum operating input voltage VO Output voltage VO Output voltage ΔVO Line regulation ΔVO Load regulation Vd Id ISC Test conditions IO = 10 mA, TJ = -40 to 125°C Min. Typ. Max. 26 Unit V 4.81 5 5.19 V 4.
PAGE 9
LM2931XX, LM2931AXX33, LM2931AXX50 Electrical characteristics 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. Table 6.
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Typical characteristics LM2931XX, LM2931AXX33, LM2931AXX50 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 10/21 Doc ID 6740 Rev 20 Line regulation vs.
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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.
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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.
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LM2931XX, LM2931AXX33, LM2931AXX50 Typical characteristics Figure 23. Line transient VI = 14 V, IO = 100 mA, TJ = 25°C, CI = 0.
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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® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark.
PAGE 15
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.
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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.
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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.
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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.
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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.
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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.
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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.