L4941_06

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 2/17 L4941 Block diagram 1 Figure 1. Block diagram Block diagram 3/17 Pin configuration L4941 2 Figure 2. Pin configuration Pin connections (top view) TO-220 DPAK 4/17 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 5/17 Test circuits L4941 4 Figure 3. Test circuits DC Parameters Figure 4. Load rejection Figure 5. Ripple rejection 6/17 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 7/17 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 8/17 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 9/17 Typical application L4941 Figure 18. Line transient response Figure 19. Total power dissipation Figure 20. Load transient response 10/17 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. 11/17 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. 12/17 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 13/17 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 14/17 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 15/17 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 16/17 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. 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