Datasheet

ManualsBrandsSTMICROELECTRONICS ManualsVoltage RegulatorsSwitching Voltage Regulator

1/18February 2005

■ PRECISE 5, 8.5, 10, 12V OUTPUTS

■ LOW DROPOUT VOLTAGE

(500mV Typ. at 1.5A)

■ 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

PAK 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.

L4940

SERIES

VERY LOW DROP 1.5A REGULATORS

Figure 1: Block Diagram

TO-220

PAK

TO-220FP

PAK/A

Rev. 6

Summary of content (18 pages)

PAGE 1
L4940 SERIES VERY LOW DROP 1.5A REGULATORS ■ ■ ■ ■ ■ ■ PRECISE 5, 8.5, 10, 12V OUTPUTS LOW DROPOUT VOLTAGE (500mV Typ. at 1.5A) VERY LOW QUIESCENT CURRENT THERMAL SHUTDOWN SHORT CIRCUIT PROTECTION REVERSE POLARITY PROTECTION TO-220 TO-220FP D2PAK D2PAK/A DESCRIPTION The L4940 series of three terminal positive regulators is available in TO-220, TO-220FP and D2PAK packages and with several fixed output voltages, making it useful in a wide range of industrial and consumer applications.
PAGE 2
L4940 SERIES Table 1: Absolute Maximum Ratings Symbol VI Parameter Value Unit 30 V Forward Input Voltage Reverse Input Voltage VIR RO=100Ω -15 V VO=8.
PAGE 3
L4940 SERIES TEST CIRCUITS Figure 3: DC Parameter Figure 4: Load Rejection Figure 5: Ripple Rejection 3/18
PAGE 4
L4940 SERIES Table 4: Electrical Characteristics Of L4940V5 (Refer to test circuit, VI=7V, CI = 0.1µF, CO = 22µF, TJ = 25°C, unless otherwise specified.) Symbol Parameter Test Conditions VO Output Voltage IO = 500 mA VO Output Voltage IO = 5mA to 1.5A VI VI = 6.5 to 15V Min. Typ. Max. Unit 4.9 5 5.1 V 4.8 5 5.2 V 17 V 4 10 mV Input Voltage IO = 5 mA ∆VO Line Regulation VI = 6 to 17V ∆VO Load Regulation IO = 5mA to 1.5A 8 25 mV IO = 0.
PAGE 5
L4940 SERIES Table 6: Electrical Characteristics Of L4940V10 (Refer to test circuit, VI=12V, CI = 0.1µF, CO = 22µF, TJ = 25°C, unless otherwise specified.) Symbol Parameter Test Conditions VO Output Voltage IO = 500 mA VO Output Voltage IO = 5mA to 1.5A VI VI = 11.7 to 15V Min. Typ. Max. Unit 9.8 10 10.2 V 9.6 10 10.4 V Input Voltage IO = 5 mA ∆VO Line Regulation VI = 11 to 17V ∆VO Load Regulation IO = 5mA to 1.5A 15 35 mV IO = 0.
PAGE 6
L4940 SERIES TYPICAL CHARACTERISTICS Figure 6: Dropout Voltage vs Output Current Figure 9: Output Voltage vs Temperature (L4940V85) Figure 7: Dropout Voltage vs Temperature Figure 10: Output Voltage vs Temperature (L4940V10) Figure 8: Output Voltage vs Temperature (L4940V5) Figure 11: Output Voltage vs Temperature (L4940V12) 6/18
PAGE 7
L4940 SERIES Figure 12: Quiescent Current vs Temperature (L4940V5) Figure 15: Short Circuit Current vs Temperature (L4940V5) Figure 13: Quiescent Current vs Input Voltage (L4940V5) Figure 16: Peak Output Current vs Input/Output Differential Voltage (L4940V5) Figure 14: Quiescent Current vs Output Current (L4940V5) Figure 17: Low Voltage Behavior (L4940V5) 7/18
PAGE 8
L4940 SERIES Figure 18: Low Voltage Behavior (L4940V85) Figure 21: Supply Voltage Rejection vs Frequency (L4940V5) Figure 19: Low Voltage Behavior (L4940V10) Figure 22: Supply Voltage Rejection vs Output Current (L4940V5) Figure 20: Low Voltage Behavior (L4940V12) Figure 23: Lad Dump Characteristics (L4940V5) 8/18
PAGE 9
L4940 SERIES Figure 24: Line Transient Response (L4940V5) Figure 26: Load Transient Response Figure 25: Total Power Dissipation 9/18
PAGE 10
L4940 SERIES 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 ADVANTAGES OTF THESE APPLICATION ARE: On card regulation with short-circuit and thermal protection on each output.
PAGE 11
L4940 SERIES Figure 29: Distributed Supply with On-card L4940 and L4941 low drop regulator ADVANTAGES OF THIS CONFIGURATION ARE: Very high regulation (line and load on both the output voltage 12V output short circuit and thermally protected Very high efficiency on the 12 V output due to the low drop regulator 11/18
PAGE 12
L4940 SERIES TO-220 MECHANICAL DATA DIM. mm. MIN. TYP inch 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.
PAGE 13
L4940 SERIES TO-220FP MECHANICAL DATA mm. DIM. MIN. TYP inch MAX. MIN. TYP. MAX. A 4.40 4.60 0.173 0.181 B 2.5 2.7 0.098 0.106 D 2.5 2.75 0.098 0.108 E 0.45 0.70 0.017 0.027 F 0.75 1 0.030 0.039 F1 1.15 1.50 0.045 0.059 F2 1.15 1.50 0.045 0.059 G 4.95 5.2 0.194 0.204 G1 2.4 2.7 0.094 0.106 H 10.0 10.40 0.393 L2 L3 16 0.409 0.630 28.6 30.6 1.126 1.204 L4 9.8 10.6 0.385 0.417 L5 2.9 3.6 0.114 0.142 L6 15.9 16.4 0.626 0.
PAGE 14
L4940 SERIES D2PAK MECHANICAL DATA mm. inch DIM. MIN. TYP MAX. MIN. TYP. MAX. A 4.4 4.6 0.173 0.181 A1 2.49 2.69 0.098 0.106 A2 0.03 0.23 0.001 0.009 B 0.7 0.93 0.027 0.036 B2 1.14 1.7 0.044 0.067 C 0.45 0.6 0.017 0.023 C2 1.23 1.36 0.048 0.053 D 8.95 9.35 0.352 0.368 10.4 0.393 D1 E 8 10 E1 0.315 8.5 0.409 0.335 G 4.88 5.28 0.192 0.208 L 15 15.85 0.590 0.624 L2 1.27 1.4 0.050 0.055 L3 1.4 1.75 0.055 0.068 M 2.4 3.2 0.
PAGE 15
L4940 SERIES D2PAK/A MECHANICAL DATA mm. inch DIM. MIN. TYP MAX. MIN. TYP. MAX. A 4.40 4.60 0.173 0.181 A1 2.49 2.69 0.098 0.106 A2 0.03 0.23 0.001 0.009 B 0.7 0.93 0.028 0.037 B1 0.8 1.3 0.031 0.051 B2 1.14 1.7 0.045 0.067 C 0.45 0.60 0.018 0.024 C2 1.23 1.36 0.048 0.054 D 8.95 9.35 0.352 0.368 D1 E 8 10 E1 G 0.315 10.4 0.394 8.5 0.409 0.335 4.88 5.28 0.192 0.208 L 15 15.85 0.591 0.624 L2 1.27 1.4 0.050 0.055 M 2.4 3.2 0.094 0.
PAGE 16
L4940 SERIES Tape & Reel D2PAK-P 2PAK-D 2PAK/A-P 2PAK/A MECHANICAL DATA mm. inch DIM. MIN. TYP A MIN. TYP. 180 13.0 13.2 MAX. 7.086 C 12.8 D 20.2 0.795 N 60 2.362 T 16/18 MAX. 0.504 0.512 14.4 0.519 0.567 Ao 10.50 10.6 10.70 0.413 0.417 0.421 Bo 15.70 15.80 15.90 0.618 0.622 0.626 Ko 4.80 4.90 5.00 0.189 0.193 0.197 Po 3.9 4.0 4.1 0.153 0.157 0.161 P 11.9 12.0 12.1 0.468 0.472 0.
PAGE 17
L4940 SERIES Table 8: Revision History Date Revision 04-Feb-2005 6 Description of Changes Add new package D2PAK/A.
PAGE 18
L4940 SERIES Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice.