L4941
Very low drop 1A regulator
Feature summary
■ ■ ■ ■ ■
Low dropout voltage (450mV typ. at 1A) Very low quiescent current Thermal shutdown Short circuit protection Reverse polarity protection
Description
The L4941 is a three terminal 5V positive regulators available in TO-220 and DPAK packages, 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 battery powered equipments, reducing consumption and
TO-220
DPAK
prolonging battery life. It employs internal current limiting, antisaturation circuit, thermal shut-down and safe area protection.
Order code
Part number L4941BV L4941BDT-TR September 2006 Rev. 5 Package TO-220 DPAK 1/17
www.st.com
17
L4941
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
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L4941
Block diagram
1
Figure 1.
Block diagram
Block diagram
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Pin configuration
L4941
2
Figure 2.
Pin configuration
Pin connections (top view)
TO-220
DPAK
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L4941
Maximum ratings
3
Table 1.
Maximum ratings
Absolute maximum ratings
Parameter Forward input voltage Reverse input voltage (RO=100Ω) Output current Power dissipation Storage temperature range Operating junction temperature range Value 30 -15 Internally Limited Internally Limited -40 to +150 -40 to +150 Unit V V mA mW °C °C
Symbol VI VIR IO PD 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 TO-220 3 50 DPAK 8 100 Unit °C/W °C/W
Table 2.
Symbol RthJC RthJA
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Test circuits
L4941
4
Figure 3.
Test circuits
DC Parameters
Figure 4.
Load rejection
Figure 5.
Ripple rejection
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L4941
Electrical characteristics
5
Table 3.
Symbol VO VI ∆VO ∆VO
Electrical characteristics
Electrical characteristics (refer to test circuit, VI=7V, CI = 0.1µF, CO = 22µF, TJ = 25°C, unless otherwise specified.)
Parameter Output voltage Input voltage Line regulation Load regulation Test conditions IO = 5mA to 1A, VI = 6 to 14V IO = 5 m A VI = 6 to 16V, IO = 5 mA IO = 5mA to 1A IO = 0.5A to 1A Quiescent current IO = 5 mA, VI = 6V IO = 1A, VI = 6V Quiescent current change IO = 5 mA, VI = 6 to 14V IO = 1A, VI = 6 to 14V Dropout voltage Output voltage drift Supply voltage rejection Short circuit current Output impedance Output noise voltage f = 120Hz, IO = 1A VI = 14V VI = 6V f = 1KHz, IO = 0.5A B = 100Hz to 100KHz 58 IO = 0.5A IO = 1A 250 450 0.6 68 1.6 1.8 30 30 2.0 A 2.2 mΩ µV/VO 5 8 5 4 20 Min. 4.8 Typ. 5 Max. 5.2 16 20 20 15 8 40 3 -10 450 700 Unit V V mV mV mV mA mA mA mA mV mV mV/°C dB
Iq ∆I q
Vd ∆VO/∆T SVR Isc ZO eN
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Typical application
L4941
6
Figure 6.
Typical application
Dropout voltage vs output current Figure 7. Dropout voltage vs temperature
Figure 8.
Output voltage vs temperature
Figure 9.
Quiescent current vs temperature
Figure 10. Quiescent current vs input voltage Figure 11. Quiescent current vs output current
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L4941
Typical application
Figure 12. Short circuit current vs temperature Figure 13. Peak output current vs input/output differential voltage
Figure 14. Low voltage behavior
Figure 15. Supply voltage rejection vs frequency
Figure 16. Supply voltage rejection vs output current
Figure 17. Load dump characteristics
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Typical application
L4941
Figure 18. Line transient response
Figure 19. Total power dissipation
Figure 20. Load transient response
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L4941
Schematic application
7
Schematic application
Figure 21. Distributed supply with On-card L4940 and L4941 low drop regulator
Figure 22. 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 preregulation and very low-drop postregulation.
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Package mechanical data
L4941
8
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.
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L4941
Package mechanical data
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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Package mechanical data
L4941
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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L4941
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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Revision history
L4941
9
Table 4.
Date
Revision history
Revision history
Revision 4 5 Document updating. Order Codes has been updated and new template. Changes
21-Jun-2004 15-Sep-2006
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L4941
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