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 DPAK 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 prolonging battery life. It employs internal current devices are particularly suitable for battery limiting, antisaturation circuit, thermal shut-down powered equipments, reducing consumption and and safe area protection. Order code Part number Package L4941BV TO-220 L4941BDT-TR DPAK September 2006 Rev. 5 1/17 www.st.com 17

L4941 Contents 1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 7 Schematic application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2/17

L4941 Block diagram 1 Block diagram Figure 1. Block diagram 3/17

Pin configuration L4941 2 Pin configuration Figure 2. Pin connections (top view) TO-220 DPAK 4/17

L4941 Maximum ratings 3 Maximum ratings Table 1. Absolute maximum ratings Symbol Parameter Value Unit V Forward input voltage 30 V I V Reverse input voltage (R =100Ω) -15 V IR O I Output current Internally Limited mA O P Power dissipation Internally Limited mW D T Storage temperature range -40 to +150 °C stg T Operating junction temperature range -40 to +150 °C op Note: Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied Table 2. Thermal Data Symbol Parameter TO-220 DPAK Unit R Thermal resistance junction-case 3 8 °C/W thJC R Thermal resistance junction-ambient 50 100 °C/W thJA 5/17

Test circuits L4941 4 Test circuits Figure 3. DC Parameters Figure 4. Load rejection Figure 5. Ripple rejection 6/17

L4941 Electrical characteristics 5 Electrical characteristics Table 3. Electrical characteristics (refer to test circuit, V=7V, C = 0.1µF, C = 22µF, T = 25°C, I I O J unless otherwise specified.) Symbol Parameter Test conditions Min. Typ. Max. Unit V Output voltage I = 5mA to 1A, V = 6 to 14V 4.8 5 5.2 V O O I V Input voltage I = 5 mA 16 V I O ∆V Line regulation V = 6 to 16V, I = 5 mA 5 20 mV O I O I = 5mA to 1A 8 20 mV ∆V Load regulation O O I = 0.5A to 1A 5 15 mV O I = 5 mA, V = 6V 4 8 mA O I I Quiescent current q I = 1A, V = 6V 20 40 mA O I I = 5 mA, V = 6 to 14V 3 mA ∆I Quiescent current change O I q I = 1A, V = 6 to 14V -10 mA O I I = 0.5A 250 450 mV O V Dropout voltage d I = 1A 450 700 mV O ∆V /∆T Output voltage drift 0.6 mV/°C O SVR Supply voltage rejection f = 120Hz, I = 1A 58 68 dB O V = 14V 1.6 2.0 I I Short circuit current A sc V = 6V 1.8 2.2 I Z Output impedance f = 1KHz, I = 0.5A 30 mΩ O O e Output noise voltage B = 100Hz to 100KHz 30 µV/V N O 7/17

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. 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 Figure 17. Load dump characteristics current 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 mm. inch DIM. MIN. TYP MAX. MIN. TYP. MAX. 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 1.27 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 0.409 L2 16.4 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 0.600 0.620 L7 6.2 6.6 0.244 0.260 L9 3.5 3.93 0.137 0.154 DIA. 3.75 3.85 0.147 0.151 P011C 13/17

Package mechanical data L4941 DPAK MECHANICAL DATA mm. inch DIM. MIN. TYP MAX. MIN. TYP. MAX. A 2.2 2.4 0.086 0.094 A1 0.9 1.1 0.035 0.043 A2 0.03 0.23 0.001 0.009 B 0.64 0.9 0.025 0.035 b4 5.2 5.4 0.204 0.212 C 0.45 0.6 0.017 0.023 C2 0.48 0.6 0.019 0.023 D 6 6.2 0.236 0.244 D1 5.1 0.200 E 6.4 6.6 0.252 0.260 E1 4.7 0.185 e 2.28 0.090 e1 4.4 4.6 0.173 0.181 H 9.35 10.1 0.368 0.397 L 1 0.039 (L1) 2.8 0.110 L2 0.8 0.031 L4 0.6 1 0.023 0.039 R 0.2 0.008 V2 0° 8° 0° 8° 0068772-F 14/17

L4941 Package mechanical data Tape & Reel DPAK-PPAK MECHANICAL DATA mm. inch DIM. MIN. TYP MAX. MIN. TYP. MAX. A 330 12.992 C 12.8 13.0 13.2 0.504 0.512 0.519 D 20.2 0.795 N 60 2.362 T 22.4 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 0.319 15/17

Revision history L4941 9 Revision history Table 4. Revision history Date Revision Changes 21-Jun-2004 4 Document updating. 15-Sep-2006 5 Order Codes has been updated and new template. 16/17

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