L4940XX STMICROELECTRONICS | Alldatasheet

Document overview

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  • PDF pages: 23

Technical content

Datasheet sections

  • 1 Block diagram
  • 2 Pin configuration
  • 3 Maximum ratings
  • 4 Test circuits
  • 5 Electrical characteristics
  • 6 Typical application
  • 7 Schematic application
  • 8 Package mechanical data
  • 9 Revision history

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

Description

The L4940 series of three terminal positive regulators is available in TO-220, TO-220FP and D 2PAK 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 prolonging battery life. Each type employs internal current limiting, antisaturation circuit, thermal shut-down and safe area protection. D2PAK TO-220FPTO-220 Table 1. Device summary

1 Block diagram

Figure 1. Block diagram

2 Pin configuration

Figure 2. Pin connections (top view)

3 Maximum ratings

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. Absolute maximum ratings Table 3. Thermal data

4 Test circuits

Figure 3. DC parameters Figure 4. Load rejection Figure 5. Ripple rejection

5 Electrical characteristics

Table 4. Electrical characteristics of L4940xx5 (Refer to test circuit, VI = 7 V, CI = 0.1 µF ,

Table 5. Electrical characteristics of L4940xx85 (Refer to test circuit, VI = 10.5 V, CI = 0.1 µF ,

Table 6. Electrical characteristics of L4940xx10 (Refer to test circuit, VI = 12V, CI = 0.1 µF ,

Table 7. Electrical characteristics of L4940xx12 (Refer to test circuit, VI = 14 V, CI = 0.1 µF ,

6 Typical application

Figure 6. Dropout voltage vs output current Figure 7. Dropout voltage vs temperature Figure 8. Output voltage vs temperature Figure 9. Output voltage vs temperature Figure 10. Output voltage vs temperature Figure 11. Output voltage vs temperature

7 Schematic application

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. 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

Figure 29. Distributed supply with On-card L4940 and L4941 low drop regulator

L4940xx Package mechanical data

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.

Package mechanical data L4940xx Dim. mm. inch. A 4.40 4.60 0.17 3 0.181 C1 . 2 3 1.32 0.04 8 0.051 D 2.40 2.72 0.0 94 0.107 D1 1.27 0.050 E0 . 4 9 0.70 0.01 9 0.027 F 0.61 0. 88 0.024 0.0 34 F1 1.14 1.70 0.044 0.067 F2 1.14 1.70 0.044 0.067 G4 . 95 5.15 0.1 94 0.20 3 G1 2.4 2.7 0.0 94 0.106 H2 10.0 10.40 0. 393 0.409 L2 16.4 0.645 L4 1 3.0 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 L93 .5 3.93 0.137 0.154 TO-220 mechanical data P011C

L4940xx Package mechanical data Dim. mm. inch. A 4.40 4.60 0.17 3 0.181 B 2.5 2.7 0.0 98 0.106 D 2.5 2.75 0.0 98 0.108 E 0.45 0.70 0.017 0.027 F 0.75 1 0.0 300 . 0 39 F1 1.15 1.50 0.045 0.05 9 F2 1.15 1.50 0.045 0.05 9 G4 . 95 5.2 0.1 94 0.204 G1 2.4 2.7 0.0 94 0.106 H 10.0 10.40 0. 393 0.409 L2 16 0.6 30 L3 28.6 30.6 1.126 1.204 L4 9.8 10.6 0. 3850 . 4 1 7 L5 2. 93 .6 0.114 0.142 L6 15. 9 16.4 0.626 0.645 L7 99 .3 0.354 0. 366 DIA. 33 .2 0.11 8 0.126 TO-220FP mechanical data 7012510A-H

Package mechanical data L4940xx Dim. mm. inch. A 4.4 4.6 0.17 3 0.181 A1 2.4 9 2.69 0.098 0.106 A2 0.0 3 0.23 0.001 0.00 9 B 0.7 0. 93 0.027 0.0 36 B2 1.14 1.7 0.044 0.067 C 0.45 0.6 0.017 0.02 3 C2 1.2 3 1.36 0.04 8 0.053 D 8.95 9.350 . 352 0. 368 D1 8 0.315 E 10 10.4 0. 393 0.409 E1 8.5 0. 335 G4 . 88 5.28 0.192 0.20 8 L 15 15. 85 0.5 90 0.624 L2 1.27 1.4 0.050 0.055 L3 1.4 1.75 0.055 0.06 8 M2 . 4 3.2 0.0 94 0.126 R 0.4 0.016 V2 0° 8°0 ° 8° D2PAK mechanical data P011P6G

L4940xx Package mechanical data Dim. mm. inch. A1 80 7.0 86 D 20.2 0.7 95 N6 0 2 . 362 T 14.4 0.567 Tape & reel D2PAK-P2PAK-D2PAK/A-P2PAK/A mechanical data

9 Revision history

Table 8. Document revision history 04-Feb-2005 6 Add new package D 2PAK/A. 18-Sep-2006 7 Order codes has been updated and new template. 31-May-2007 8 Order codes has been updated. 19-Sep-2007 9 Add Table 1 in cover page. 20-Feb-2008 10 Modified: Table 1 on page 1.