Datasheet

ManualsBrandsSTMICROELECTRONICS ManualsVoltage RegulatorsL4941BDT-TR

September 2006 Rev. 5 1/17

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

prolonging battery life. It employs internal current

limiting, antisaturation circuit, thermal shut-down

and safe area protection.

DPAK

TO-220

www.st.com

Order code

Part number Package

L4941BV TO-220

L4941BDT-TR DPAK

Summary of content (17 pages)

PAGE 1
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 TO-220 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.
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L4941 Contents 1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Test circuits 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 Typical application . . . . . . . .
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L4941 Block diagram 1 Block diagram Figure 1.
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Pin configuration L4941 2 Pin configuration Figure 2.
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L4941 Maximum ratings 3 Maximum ratings Table 1. Absolute maximum ratings Symbol Parameter Value Unit VI Forward input voltage 30 V VIR Reverse input voltage (RO=100Ω) -15 V IO Output current Internally Limited mA PD Power dissipation Internally Limited mW Tstg Storage temperature range -40 to +150 °C Top Operating junction temperature range -40 to +150 °C Note: Absolute Maximum Ratings are those values beyond which damage to the device may occur.
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Test circuits 4 Test circuits Figure 3. DC Parameters Figure 4. Load rejection Figure 5.
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L4941 Electrical characteristics 5 Electrical characteristics Table 3. Electrical characteristics (refer to test circuit, VI=7V, CI = 0.1µF, CO = 22µF, TJ = 25°C, unless otherwise specified.) Symbol Parameter Test conditions Min. Typ. Max. Unit 4.8 5 5.2 V 16 V VO Output voltage IO = 5mA to 1A, VI = 6 to 14V VI Input voltage IO = 5 mA ∆VO Line regulation VI = 6 to 16V, IO = 5 mA 5 20 mV ∆VO IO = 5mA to 1A 8 20 mV Load regulation IO = 0.
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Typical application L4941 6 Typical application Figure 6. 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.
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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.
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Typical application Figure 18. Line transient response Figure 20. Load transient response 10/17 L4941 Figure 19.
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L4941 7 Schematic application 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 8 L4941 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.
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L4941 Package mechanical data TO-220 MECHANICAL DATA DIM. mm. MIN. MAX. MIN. A 4.40 4.60 0.173 0.181 C 1.23 1.32 0.048 0.051 D 2.40 2.72 0.094 0.107 D1 TYP inch 1.27 TYP. MAX. 0.050 E 0.49 0.70 0.019 0.027 F 0.61 0.88 0.024 0.034 F1 1.14 1.70 0.044 0.067 F2 1.14 1.70 0.044 0.067 G 4.95 5.15 0.194 0.203 G1 2.4 2.7 0.094 0.106 H2 10.0 10.40 0.393 L2 16.4 0.409 0.645 L4 13.0 14.0 0.511 0.551 L5 2.65 2.95 0.104 0.116 L6 15.25 15.75 0.
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Package mechanical data L4941 DPAK MECHANICAL DATA mm. inch DIM. MIN. TYP MAX. MIN. TYP. MAX. A A1 A2 B b4 2.2 0.9 0.03 0.64 5.2 2.4 1.1 0.23 0.9 5.4 0.086 0.035 0.001 0.025 0.204 0.094 0.043 0.009 0.035 0.212 C C2 D D1 E E1 0.45 0.48 6 0.6 0.6 6.2 0.017 0.019 0.236 0.023 0.023 0.244 6.6 0.252 e e1 H L (L1) L2 L4 R V2 5.1 6.4 0.200 4.7 0.185 2.28 0.090 4.4 9.35 1 4.6 10.1 0.173 0.368 0.039 2.8 0.8 0.6 0.181 0.397 0.110 0.031 1 0.023 0.2 0° 0.260 0.039 0.
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L4941 Package mechanical data Tape & Reel DPAK-PPAK MECHANICAL DATA mm. inch DIM. MIN. TYP A MAX. MIN. TYP. 330 13.0 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 13.2 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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Revision history L4941 9 Revision history Table 4. Revision history Date Revision 21-Jun-2004 4 Document updating. 15-Sep-2006 5 Order Codes has been updated and new template.
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L4941 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.