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L4940xx
Very low drop 1.5 A regulator
Features

Precise 5, 8.5, 10, 12 V outputs Low dropout voltage (450 mV typ. at 1 A) Very low quiescent current Thermal shutdown Short circuit protection Reverse polarity protection
TO-220 TO-220FP
Description
The L4940 series of three terminal positive regulators is available in TO-220, TO-220FP and D2PAK packages and with several fixed output voltages, making it useful in a wide range of industrial and consumer applications. Thanks to its very low input/output voltage drop, these devices are particularly suitable for batteries powered equipment, reducing consumption and
D2PAK
prolonging battery life. Each type employs internal current limiting, antisaturation circuit, thermal shut-down and safe area protection.
Table 1.
Device summary
Order code Output voltage 5V 8.5 V 10 V 12 V
Part number TO-220 L4940xx5 L4940xx85 L4940xx10 L4940xx12 L4940V5 L4940V85 L4940P85 TO-220FP
D2PAK L4940D2T5-TR L4940D2T85-TR L4940D2T10-TR L4940D2T12-TR
February 2008
Rev 10
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Contents
L4940xx
Contents
1 2 3 4 5 6 7 8 9 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Test circuits ............................................... 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
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L4940xx
Block diagram
1
Figure 1.
Block diagram
Block diagram
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Pin configuration
L4940xx
2
Figure 2.
Pin configuration
Pin connections (top view)
TO-220
TO-220FP
D2PAK
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L4940xx
Maximum ratings
3
Table 2.
Symbol VI
Maximum ratings
Absolute maximum ratings
Parameter Forward input voltage VO = 5V, RO = 100 VIR Reverse input voltage VO = 8.5V, RO = 180 VO = 10V, RO = 200 VO = 12V, RO = 240 IO PD Tstg Top Output current Power dissipation Storage temperature range Operating junction temperature range Value 30 -15 -15 -15 -15 Internally Limited Internally Limited -40 to +150 -40 to +150 Unit V V V V V mA mW C C
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 TO-220 3 50 TO-220FP 5 60 D2PAK 3 62.5 Unit C/W C/W
Table 3.
Symbol RthJC RthJA
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Test circuits
L4940xx
4
Figure 3.
Test circuits
DC parameters
Figure 4.
Load rejection
Figure 5.
Ripple rejection
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L4940xx
Electrical characteristics
5
Table 4.
Symbol VO VO VI VO VO
Electrical characteristics
Electrical characteristics of L4940xx5 (Refer to test circuit, VI = 7 V, CI = 0.1 F, CO = 22 F, TJ = 25C, unless otherwise specified.)
Parameter Output voltage Output voltage Input voltage Line regulation Load regulation Test conditions IO = 500 mA IO = 5mA to 1.5A, VI = 6.5 to 15 V IO = 5 mA VI = 6 to 17 V, IO = 5 mA IO = 5 mA to 1.5 A IO = 0.5 A to 1 A Quiescent current IO = 5 mA IO = 1.5 A, VI = 6.5 V Quiescent current change Output voltage drift Supply voltage rejection Dropout voltage f = 120 Hz, IO = 1 A IO = 0.5 A IO = 1.5 A Short circuit current VI = 14 V VI = 6.5 V 58 IO = 5 mA IO = 1.5 A, VI = 6.5 to 16 V 0.5 68 200 500 2 2.2 400 900 2.7 A 2.9 4 8 5 5 30 Min. 4.9 4.8 Typ. 5 5 Max. 5.1 5.2 17 10 25 15 8 50 3 15 Unit V V V mV mV mV mA mA mA mA mV/C dB mV mV
Iq Iq VO/T SVR Vd
Isc
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Electrical characteristics Table 5.
Symbol VO VO VI VO VO
L4940xx
Electrical characteristics of L4940xx85 (Refer to test circuit, VI = 10.5 V, CI = 0.1 F, CO = 22 F, TJ = 25C, unless otherwise specified.)
Parameter Output voltage Output voltage Input voltage Line regulation Load regulation Test conditions IO = 500 mA IO = 5mA to 1.5A, VI = 10.2 to 15V IO = 5 mA VI = 9.5 to 17V, IO = 5 mA IO = 5mA to 1.5A IO = 0.5A to 1A Quiescent current IO = 5 mA IO = 1.5A, VI = 10.2V Quiescent current change Output voltage drift Supply voltage rejection Dropout voltage f = 120Hz, IO = 1A IO = 0.5A IO = 1.5A Short circuit current VI = 14V VI = 10.2V 58 IO = 5 mA IO = 1.5A, VI = 10.2 to 16V 0.8 66 200 500 2 2.2 400 900 2.7 A 2.9 4 12 8 4 30 Min. 8.3 8.15 Typ. 8.5 8.5 Max. 8.7 8.85 17 9 30 16 8 50 2.5 15 Unit V V V mV mV mV mA mA mA mA mV/C dB mV mV
Iq Iq VO/T SVR Vd
Isc
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L4940xx
Electrical characteristics
Table 6.
Symbol VO VO VI VO VO
Electrical characteristics of L4940xx10 (Refer to test circuit, VI = 12V, CI = 0.1 F, CO = 22 F, TJ = 25C, unless otherwise specified.)
Parameter Output voltage Output voltage Input voltage Line regulation Load regulation Test conditions IO = 500 mA IO = 5 mA to 1.5 A, VI = 11.7 to 15 V IO = 5 mA VI = 11 to 17 V, IO = 5 mA IO = 5 mA to 1.5 A IO = 0.5 A to 1 A Quiescent current IO = 5 mA IO = 1.5 A, VI = 11.7 V Quiescent current change Output voltage drift Supply voltage rejection Dropout voltage f = 120 Hz, IO = 1 A IO = 0.5 A IO = 1.5 A Short circuit current VI = 14 V VI = 11.7 V 56 IO = 5 mA IO = 1.5 A, VI = 11.7 to 16 V 1 62 200 500 2 2.2 400 900 2.7 A 2.9 3 15 10 5 30 Min. 9.8 9.6 Typ. 10 10 Max. 10.2 10.4 17 8 35 20 8 50 2 13 Unit V V V mV mV mV mA mA mA mA mV/C dB mV mV
Iq Iq VO/T SVR Vd
Isc
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Electrical characteristics Table 7.
Symbol VO VO VI VO VO
L4940xx
Electrical characteristics of L4940xx12 (Refer to test circuit, VI = 14 V, CI = 0.1 F, CO = 22 F, TJ = 25C, unless otherwise specified.)
Parameter Output voltage Output voltage Input voltage Line regulation Load regulation Test conditions IO = 500 mA IO = 5 mA to 1.5 A, VI = 11.7 to 15 V IO = 5 mA VI = 11 to 17 V, IO = 5 mA IO = 5 mA to 1.5 A IO = 0.5 A to 1 A Quiescent current IO = 5 mA IO = 1.5 A, VI = 11.7 V Quiescent current change Output voltage drift Supply voltage rejection Dropout voltage Short circuit current Output impedance f = 120 Hz, IO = 1 A IO = 0.5 A IO = 1.5 A VI = 14 V f = 120 Hz, IO = 0.5 A 55 IO = 5 mA IO = 1.5 A, VI = 11.7 to 16 V 1.2 61 200 500 2 40 400 900 2.7 3 15 10 4 30 Min. 11.75 11.5 Typ. 12 12 Max. 12.25 12.5 17 7 35 25 8 50 1.5 10 Unit V V V mV mV mV mA mA mA mA mV/C dB mV mV A m
Iq Iq VO/T SVR Vd Isc ZO
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L4940xx
Typical application
6
Figure 6.
Typical application
Dropout voltage vs output current Figure 7. Dropout voltage vs temperature
Figure 8.
Output voltage vs temperature (L4940V5)
Figure 9.
Output voltage vs temperature (L4940V85)
Figure 10. Output voltage vs temperature (L4940V10)
Figure 11. Output voltage vs temperature (L4940V12)
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Typical application
L4940xx
Figure 12. Quiescent current vs temperature (L4940V5)
Figure 13. Quiescent current vs input voltage (L4940V5)
Figure 14. Quiescent current vs output current Figure 15. Short circuit current vs temperature (L4940V5) (L4940V5)
Figure 16. Peak output current vs input/output Figure 17. Low voltage behavior (L4940V5) differential voltage (L4940V5)
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L4940xx
Typical application
Figure 18. Low voltage behavior (L4940V85)
Figure 19. Low voltage behavior (L4940V10)
Figure 20. Low voltage behavior (L4940V12)
Figure 21. Supply voltage rejection vs frequency (L4940V5)
Figure 22. Supply voltage rejection vs output current (L4940V5)
Figure 23. Lad dump characteristics (L4940V5)
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Typical application Figure 24. Line transient response (L4940V5) Figure 25. Total power dissipation
L4940xx
Figure 26. Load transient response
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L4940xx
Schematic application
7
Schematic application
Figure 27. Distributed supply with On-card L4940 and L4941 low drop regulator
Figure 28. Distributed supply with On-card L4940 and L4941 low drop regulator
ADVANTAGES OF THESE APPLICATION ARE: On card regulation with short-circuit and thermal protection on each output. Vary high total system efficiency due to the switching pre-regulation and very low-drop post-regulation.
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Schematic application
L4940xx
Figure 29. Distributed supply with On-card L4940 and L4941 low drop regulator
ADVANTAGES OF THIS CONFIGURATION ARE: Very high regulation (line and load on both the output voltage 12V output short circuit and thermally protected Very high efficiency on the 12 V output due to the low drop regulator
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L4940xx
Package mechanical data
8
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
L4940xx
TO-220 mechanical data
Dim. A C D D1 E F F1 F2 G G1 H2 L2 L4 L5 L6 L7 L9 DIA. 13.0 2.65 15.25 6.2 3.5 3.75 0.49 0.61 1.14 1.14 4.95 2.4 10.0 16.4 14.0 2.95 15.75 6.6 3.93 3.85 0.511 0.104 0.600 0.244 0.137 0.147 mm. Min. 4.40 1.23 2.40 1.27 0.70 0.88 1.70 1.70 5.15 2.7 10.40 0.019 0.024 0.044 0.044 0.194 0.094 0.393 0.645 0.551 0.116 0.620 0.260 0.154 0.151 Typ. Max. 4.60 1.32 2.72 Min. 0.173 0.048 0.094 0.050 0.027 0.034 0.067 0.067 0.203 0.106 0.409 inch. Typ. Max. 0.181 0.051 0.107
P011C
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L4940xx
Package mechanical data
TO-220FP mechanical data
Dim. A B D E F F1 F2 G G1 H L2 L3 L4 L5 L6 L7 DIA. 28.6 9.8 2.9 15.9 9 3 mm. Min. 4.40 2.5 2.5 0.45 0.75 1.15 1.15 4.95 2.4 10.0 16 30.6 10.6 3.6 16.4 9.3 3.2 1.126 0.385 0.114 0.626 0.354 0.118 Typ Max. 4.60 2.7 2.75 0.70 1 1.50 1.50 5.2 2.7 10.40 Min. 0.173 0.098 0.098 0.017 0.030 0.045 0.045 0.194 0.094 0.393 0.630 1.204 0.417 0.142 0.645 0.366 0.126 inch. Typ. Max. 0.181 0.106 0.108 0.027 0.039 0.059 0.059 0.204 0.106 0.409
7012510A-H
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Package mechanical data
L4940xx
D2PAK mechanical data
mm. Dim. Min. A A1 A2 B B2 C C2 D D1 E E1 G L L2 L3 M R V2 0 4.88 15 1.27 1.4 2.4 0.4 8 0 10 8.5 5.28 15.85 1.4 1.75 3.2 0.192 0.590 0.050 0.055 0.094 0.016 8 4.4 2.49 0.03 0.7 1.14 0.45 1.23 8.95 8 10.4 0.393 0.335 0.208 0.624 0.055 0.068 0.126 Typ. Max. 4.6 2.69 0.23 0.93 1.7 0.6 1.36 9.35 Min. 0.173 0.098 0.001 0.027 0.044 0.017 0.048 0.352 0.315 0.409 Typ. Max. 0.181 0.106 0.009 0.036 0.067 0.023 0.053 0.368 inch.
P011P6G
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L4940xx
Package mechanical data
Tape & reel D2PAK-P2PAK-D2PAK/A-P2PAK/A mechanical data
mm. Dim. Min. A C D N T Ao Bo Ko Po P 10.50 15.70 4.80 3.9 11.9 10.6 15.80 4.90 4.0 12.0 12.8 20.2 60 14.4 10.70 15.90 5.00 4.1 12.1 0.413 0.618 0.189 0.153 0.468 0.417 0.622 0.193 0.157 0.472 13.0 Typ. Max. 180 13.2 0.504 0.795 2.362 0.567 0.421 0.626 0.197 0.161 0.476 0.512 Min. Typ. Max. 7.086 0.519 inch.
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Revision history
L4940xx
9
Table 8.
Date
Revision history
Document revision history
Revision 6 7 8 9 10 Add new package D2 PAK/A. Changes
04-Feb-2005 18-Sep-2006 31-May-2007 19-Sep-2007 20-Feb-2008
Order codes has been updated and new template. Order codes has been updated. Add Table 1 in cover page. Modified: Table 1 on page 1.
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L4940xx
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