L4931ABxx
L4931Cxx
Very low drop voltage regulators with inhibit
Features
■Very low dropout voltage (0.4 V)
■Very low quiescent current
■(Typ. 50 µA in off mode, 600 µA in on mode)
■Output current up to 250 mA
■Logic-controlled electronic shutdown
■Output voltages of 2.7; 3.3; 3.5; 5; 8; 12 V
■Automotive Grade product: 2.7 V, 3.3 V, 3.5 V VOUT only in SO-8 package
■Internal current and thermal limit
■Only 2.2 µF for stability
■Available in ± 1 % (AB) or 2 % (C) selection at 25 °C
■Supply voltage rejection: 70 dB typ. for 5 V version
■Temperature range: -40 to 125 °C
Description
The L4931ABxx L4931Cxx are very Low Drop regulators available in TO-220, SO-8, DPAK, PPAK and TO-92 packages and in a wide range of output voltages.
The very low drop voltage (0.4 V) and the very low quiescent current make them particularly suitable for low noise, low power applications and specially in battery powered systems.
A TTL compatible shutdown logic control function is available in PPAK and SO-8 packages.
TO-220 |
TO-92 |
PPAK |
DPAK |
SO-8 |
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 the total power consumption. It requires only a 2.2 µF capacitor for stability allowing space and cost saving.
The L4931 is available as Automotive Grade in SO-8 package only, for the options of output voltages whose commercial Part Numbers are shown in the Table 19 on page 34 (order codes). These devices are qualified according to the specification AEC-Q100 of the Automotive market, in the temperature range -40 °C to
125 °C, and the statistical tests PAT, SYL, SBL are performed.
Table 1. |
Device summary |
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Part numbers |
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L4931ABXX27 |
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L4931CXX33 |
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L4931ABXX50 |
L4931CXX80 |
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L4931CXX27 |
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L4931ABXX35 |
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L4931CXX50 |
L4931ABXX120 |
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L4931ABXX33 |
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L4931CXX35 |
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L4931ABXX80 |
L4931CXX120 |
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August 2008 |
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Rev 17 |
1/36 |
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Contents |
L4931ABxx - L4931Cxx |
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Contents
1 |
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. 5 |
2 |
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
. 6 |
3 |
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
7 |
4 |
Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
8 |
5 |
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
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Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
24 |
7 |
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
25 |
8 |
Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
34 |
9 |
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
35 |
2/36
L4931ABxx - L4931Cxx |
List of figures |
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List of figures
Figure 1. Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 2. Pin connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 3. Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Figure 4. Line regulation vs temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Figure 5. Dropout voltage vs temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Figure 6. Supply current vs input voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Figure 7. Supply current vs temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Figure 8. Short circuit current vs dropout voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Figure 9. SVR vs input voltage signal frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3/36
List of tables |
L4931ABxx - L4931Cxx |
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List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Table 2. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 3. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 4. Electrical characteristics of L4931ABxx27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Table 5. Electrical characteristics of L4931Cxx27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Table 6. Electrical characteristics of L4931Cxx27-TRY (Automotive Grade) . . . . . . . . . . . . . . . . . . 11 Table 7. Electrical characteristics of L4931ABxx33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Table 8. Electrical characteristics of L4931Cxx33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 9. Electrical characteristics of L4931Cxx33-TRY (Automotive Grade) . . . . . . . . . . . . . . . . . . 14 Table 10. Electrical characteristics of L4931ABxx35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 11. Electrical characteristics of L4931ABxx35-TRY (Automotive Grade) . . . . . . . . . . . . . . . . . 16 Table 12. Electrical characteristics of L4931Cxx35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Table 13. Electrical characteristics of L4931ABxx50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Table 14. Electrical characteristics of L4931Cxx50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 15. Electrical characteristics of L4931ABxx80 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Table 16. Electrical characteristics of L4931Cxx80 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Table 17. Electrical characteristics of L4931ABxx120 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Table 18. Electrical characteristics of L4931Cxx120 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Table 19. Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Table 20. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4/36
L4931ABxx - L4931Cxx |
Diagram |
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5/36
Pin configuration |
L4931ABxx - L4931Cxx |
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TO-220 |
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SO-8 |
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PPAK |
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DPAK |
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PIN 1 |
= VOUT |
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PIN 2 |
= GND |
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PIN 3 |
= VIN |
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BOTTOM VIEW |
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TO-92 |
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6/36
L4931ABxx - L4931Cxx |
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Maximum ratings |
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3 |
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Maximum ratings |
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Table 2. |
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Absolute maximum ratings |
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Symbol |
Parameter |
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Value |
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Unit |
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VI |
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DC Input voltage |
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20 |
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V |
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IO |
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Output current |
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Internally limited |
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mA |
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PD |
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Power dissipation |
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Internally limited |
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mW |
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TSTG |
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Storage temperature range |
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-40 to 150 |
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°C |
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TOP |
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Operating junction temperature range |
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-40 to 125 |
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°C |
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Note: |
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Absolute maximum ratings are those values beyond which damage to the device may occur. |
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Functional operation under these condition is not implied |
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Table 3. |
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Thermal data |
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Symbol |
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Parameter |
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TO-220 |
SO-8 |
DPAK |
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PPAK |
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TO-92 |
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Unit |
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RthJC |
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Thermal resistance junction-case |
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3 |
20 |
8 |
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8 |
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°C/W |
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RthJA |
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Thermal resistance junction-ambient |
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50 |
55 |
100 |
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100 |
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200 |
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°C/W |
7/36
Application circuit |
L4931ABxx - L4931Cxx |
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8/36
L4931ABxx - L4931Cxx |
Electrical characteristics |
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Table 4. |
Electrical characteristics of L4931ABxx27 (refer to the test circuits, TA = 25 °C, |
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CI = 0.1 µF, CO = 2.2 µF unless otherwise specified). |
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Symbol |
Parameter |
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Test conditions |
Min. |
Typ. |
Max. |
Unit |
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VO |
Output voltage |
IO = 5 mA, VI = 4.7 V |
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2.673 |
2.7 |
2.727 |
V |
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IO = 5 mA, VI = 4.7 V, TA=-25 to 85°C |
2.646 |
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2.754 |
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VI |
Operating input voltage |
IO = 250 mA |
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20 |
V |
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Iout |
Output current limit |
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300 |
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mA |
VO |
Line regulation |
VI = 3.4 to 20 V, IO = 0.5 mA |
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3 |
15 |
mV |
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V |
Load regulation (1) |
V |
I |
= 3.6 V, I |
O |
= 0.5 to 250 mA |
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3 |
15 |
mV |
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O |
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Quiescent current |
VI = 3.6 to 20 V, IO = 0 mA |
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0.6 |
1 |
mA |
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Id |
ON MODE |
VI = 3.6 to 20 V, IO = 250 mA |
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4 |
6 |
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OFF MODE |
VI = 6 V |
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50 |
100 |
µA |
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f = 120 Hz |
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74 |
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SVR |
Supply voltage rejection |
IO = 5 mA |
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f = 1 kHz |
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71 |
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dB |
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VI = 4.6 ± 1 V |
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f = 10 kHz |
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55 |
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eN |
Output noise voltage |
B = 10 Hz to 100 kHz |
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µV |
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Vd |
Dropout voltage (1) |
IO = 250 mA |
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0.4 |
0.6 |
V |
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IO = 250 mA, TA= -40 to 125°C |
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0.8 |
V |
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VIL |
Control input logic low |
TA = -40 to 125°C |
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0.8 |
V |
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VIH |
Control Input Logic High |
TA = -40 to 125°C |
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2 |
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V |
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II |
Control input current |
VI = 6 V, VC = 6 V |
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10 |
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µA |
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CO |
Output bypass |
ESR = 0.1 to 10 Ω, IO = 0 to 250 mA |
2 |
10 |
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µF |
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capacitance |
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1. For SO-8 package the maximum limit of load regulation and dropout is increased by 20 mV.
9/36
Electrical characteristics |
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L4931ABxx - L4931Cxx |
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Table 5. |
Electrical characteristics of L4931Cxx27 (refer to the test circuits, TA = 25 °C, |
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CI = 0.1 µF, CO = 2.2 µF unless otherwise specified). |
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Symbol |
Parameter |
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Test conditions |
Min. |
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Typ. |
Max. |
Unit |
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VO |
Output voltage |
IO = 5 mA, VI = 4.7 V |
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2.646 |
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2.7 |
2.754 |
V |
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IO = 5 mA, VI = 4.7 V, TA=-25 to 85°C |
2.592 |
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2.808 |
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VI |
Operating input voltage |
IO = 250 mA |
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20 |
V |
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Iout |
Output current limit |
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300 |
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mA |
VO |
Line regulation |
VI = 3.4 to 20 V, IO = 0.5 mA |
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3 |
18 |
mV |
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V |
Load regulation (1) |
V |
= 3.6 V, I |
O |
= 0.5 to 250 mA |
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3 |
18 |
mV |
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O |
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I |
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Quiescent current |
VI = 3.6 to 20 V, IO = 0 mA |
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0.6 |
1 |
mA |
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Id |
ON MODE |
VI = 3.6 to 20 V, IO = 250 mA |
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4 |
6 |
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OFF MODE |
VI = 6 V |
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50 |
100 |
µA |
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f = 120 Hz |
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74 |
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SVR |
Supply voltage rejection |
IO = 5 mA |
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f = 1 kHz |
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71 |
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dB |
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VI = 4.6 ± 1 V |
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f = 10 kHz |
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55 |
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eN |
Output noise voltage |
B = 10 Hz to 100 kHz |
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50 |
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µV |
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Vd |
Dropout voltage (1) |
IO = 250 mA |
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0.4 |
0.6 |
V |
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IO = 250 mA, TA= -40 to 125°C |
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0.8 |
V |
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VIL |
Control input logic low |
TA = -40 to 125°C |
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0.8 |
V |
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VIH |
Control Input Logic High |
TA = -40 to 125°C |
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2 |
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V |
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II |
Control input current |
VI = 6 V, VC = 6 V |
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10 |
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µA |
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CO |
Output bypass |
ESR = 0.1 to 10 Ω, IO = 0 to 250 mA |
2 |
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10 |
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µF |
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capacitance |
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1. For SO-8 package the maximum limit of load regulation and dropout is increased by 20 mV.
10/36
L4931ABxx - L4931Cxx |
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Electrical characteristics |
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Table 6. |
Electrical characteristics of L4931Cxx27-TRY (Automotive Grade) (refer to the test |
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circuits, TA = -40 to 12 5°C, CI = 0.1 µF, CO = 2.2 µF unless otherwise specified). |
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Symbol |
Parameter |
Test conditions |
Min. |
Typ. |
Max. |
Unit |
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VO |
Output voltage |
IO = 5 mA, VI = 4.7 V, TA = 25°C |
2.646 |
2.7 |
2.754 |
V |
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IO = 5 mA, VI = 4.7 V |
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2.592 |
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2.808 |
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VI |
Operating input voltage |
IO = 250 mA |
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20 |
V |
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Iout |
Output current limit |
TA = 25°C |
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300 |
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mA |
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VO |
Line regulation |
VI = 3.4 to 20 V, IO = 0.5 mA |
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20 |
mV |
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VO |
Load regulation |
VI = 3.6 V, IO = 0.5 to 250 mA |
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38 |
mV |
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Quiescent current |
VI = 3.6 to 20 V, IO = 0 mA |
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1 |
mA |
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Id |
ON MODE |
VI = 3.6 to 20 V, IO = 250 mA |
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6 |
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OFF MODE |
VI = 6 V |
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100 |
µA |
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IO = 5 mA |
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f = 120 Hz |
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74 |
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SVR |
Supply voltage rejection |
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VI = 4.6 ± 1 V |
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f = 1 kHz |
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71 |
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dB |
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TA = 25°C |
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f = 10 kHz |
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55 |
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eN |
Output noise voltage |
B = 10 Hz to 100 kHz, TA = 25°C |
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50 |
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µV |
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Vd |
Dropout voltage |
IO = 250 mA, TA = 25°C |
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0.4 |
0.6 |
V |
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IO = 250 mA |
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0.82 |
V |
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VIL |
Control input logic low |
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0.82 |
V |
VIH |
Control Input Logic High |
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2 |
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V |
II |
Control input current |
VI = 6 V, VC = 6 V, TA = 25°C |
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10 |
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µA |
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CO |
Output bypass |
ESR = 0.1 to 10 Ω, IO = 0 to 250 mA, |
2 |
10 |
|
µF |
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capacitance |
TA = 25°C |
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