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L4941
VERY LOW DROP 1A REGULATOR
. . . . .
LOW DROPOUT VOLTAGE (450 mV typ at 1A) VERY LOW QUIESCENT CURRENT THERMAL SHUTDOWN SHORT CIRCUIT PROTECTION REVERSE POLARITY PROTECTION
DESCRIPTION The L4941 is a three terminal 5 V positive regulator available in TO-220, SOT-82, SOT-194 and DPAK packages, making it useful in a wide range of the industrial and consumer applications. Thanks to its very low input/output voltage drop, this device is particularly suitable for battery powered equipment, reducing consumption and prolonging battery life. It employs internal current limiting, antisaturation circuit, thermal shut-down and safe area protection. BLOCK DIAGRAM
SOT-82
SOT-194
3 1
TO-220 DPAK (TO-252)
April 1994
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PIN CONNECTIONS AND ORDERING NUMBER (top view)
TO-220
SOT-82 /SOT-194
DPAK
ORDERING NUMBERS L4941BV L4941BX L4941BS L4941BDT
OUTPUT VOLTAGE 5V 5V 5V 5V
PACKAGE TO-220 SOT-82 SOT-194 DPAK
ABSOLUTE MAXIMUM RATINGS
Symbol Vi ViR IO Ptot T j, T s t g Parameter Forward Input Voltage Reverse Input Voltage (R O = 100 ) Output Current Power Dissipation Junction and Storage Temperature Value 30 15 Internally Limited Internally Limited 40 to 150 °C Unit V V
THERMAL DATA
SOT-82 SOT-194 DPAK Rthj-case Thermal Resistance Junction-case Rthj-amb Termal resistance Junction-ambient Max Max 8 100 TO-220
3 50
o o
C/W C/W
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TEST CIRCUITS Figure 1 : DC Parameters.
Figure 2 : Load Regulation.
Figure 3 : Ripple Rejection.
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ELECTRICAL CHARACTERISTICS (refer to the test circuits T j = 25 °C, C i = 0.1 µF, C o = 22 µF, unless otherwise specified)
Symbol Output Voltage Input Voltage (unless otherwise specified) Vo Vi V o V o IQ I Q Vd V o ____ T SVR Isc Zo eN Output Voltage Operating Input Voltage Line Regulation Load Regulation Quiescent Current Quiescent Current Change Dropout Voltage Output Voltage Drift Supply Voltage Rejection Short Circuit Current Limit Output Impedance Output Noise Voltage f = 120 Hz I o = 0.5 A V i = 14 V Vi = 6 V f = 1 kHz I o = 0.5 A B = 100 Hz to 100 kHz 58 I o = 5 mA to 1 A V i = 6 V to 14 V I o = 5 mA V i = 6 V to 16 V I o = 5 mA I o = 5 mA to 1 A I o = 0.5 A to 1 A Vi = 6 V V i = 6 V to 14 V I o = 0.5 A Io = 1 A I o = 5 mA Io = 1 A I o = 5 mA Io = 1 A 250 450 0.6 68 1.6 1.8 30 30 2.0 2.2 m µV/V o 5 8 5 4 20 4.8 Parameter Test Conditions Min. Typ. 5 7 5 5.2 16 20 20 15 8 40 3 10 450 700 mV mV/°C dB V V mV mV Max. Unit
mA mA
A
Figure 4 : Dropout voltage vs. Output Current.
Figure 5 : Dropout Voltage vs. Temperature.
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Figure 6 : Output voltage vs. Temperature. Figure 7 : Quiescent Current vs. Temperature
Figure 8 : Quiescent Current vs.Input Voltage.
Figure 9 : Quiescent Current vs.Output Current.
Figure 10 : Short-circuit Current vs. Temperature.
Figure 11 : Peak Output Current vs. Input/Output Differential Voltage.
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Figure 12 : Low Voltage Behavior. Figure 13 : Supply Voltage Rejection vs. Frequency
Figure 14 : Supply Voltage Rejection vs. Output Current.
Figure 15 : Load Dump Characteristics.
Figure 16 : Line Transient Response.
Figure 17 : Load Transunt Response.
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Figure 18 : Total Power Dissipation (TO-220).
Figure 19 : Distribued Supply with On-card L4940 and L4941 Low-drop Regulators.
ADVANTAGES OF THESE APPLICATIONS ARE :
-
On card regulation with short-circuit and thermal protection on each output. Very high total system efficiency due to the switching preregulation and very low-drop postregulations.
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Figure 20 : Distribued Supply with On-card L4940 and L4941 Low-drop Regulators.
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L4941
TO-220 MECHANICAL DATA
DIM. MIN. A C D D1 E F F2 G H2 H3 L2 L3 L5 L6 L7 Dia. 26.3 2.6 15.1 6 3.65 10.05 16.2 26.7 27.1 3 15.8 6.6 3.85 1.035 0.102 0.594 0.236 0.144 2.4 1.2 0.35 0.8 1.15 4.95 5.08 mm TYP. MAX. 4.8 1.37 2.8 1.35 0.55 1.05 1.4 5.21 10.4 10.4 0.396 0.638 1.051 1.067 0.118 0.622 0.260 0.152 0.094 0.047 0.014 0.031 0.045 0.195 0.200 MIN. inch TYP. MAX. 0.189 0.054 0.110 0.053 0.022 0.041 0.055 0.205 0.409 0.409
P011D
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SOT-82 MECHANICAL DATA
mm MIN. A B b b1 C c1 D e e3 F H 7.4 10.5 0.7 0.49 2.4 1.2 15.7 2.2 4.4 3.8 2.54 TYP. MAX. 7.8 11.3 0.9 0.75 2.7 MIN. 0.291 0.413 0.028 0.019 0.04 0.047 0.618 0.087 0.173 0.150 0.100 inch TYP. MAX. 0.307 0.445 0.035 0.030 0.106
DIM.
C
A
F H c1 b b1 e3 e D B
P032A
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SOT-194 MECHANICAL DATA
DIM. MIN. A B b b1 C c1 c2 D e e3 F H P S S1 T 4 2 0.1 7.4 10.5 0.7 0.49 2.4 1.2 1.3 6 2.2 4.4 3.8 2.54 45° (typ.) 0.157 0.079 0.004 mm TYP. MAX. 7.8 11.3 0.9 0.75 2.7 MIN. 0.291 0.413 0.028 0.019 0.094 0.047 0.051 0.236 0.087 0.173 0.150 0.100 inch TYP. MAX. 0.307 0.445 0.035 0.030 0.106
C
A
F C1 S T P H e e3
P032B
S1
b1 b c2
D
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B
L4941
TO-252 (DPAK) MECHANICAL DATA
DIM. MIN. A A1 B B1 B2 B3 B4 C C1 D E G H L L1 L2 L3 L4 0.8 0.3 1.9 0.48 0.45 6 6.4 4.4 9.35 2.55 0.6 0.8 1.2 0.45 0.031 0.012 2.2 0.9 0.64 3.4 5.2 mm TYP. MAX. 2.4 1.1 0.8 3.6 5.4 0.9 2.1 0.6 0.6 6.2 6.6 4.6 10.1 3.05 1 0.074 0.018 0.017 0.236 0.252 0.173 0.368 0.100 0.023 0.031 0.047 0.017 MIN. 0.086 0.035 0.025 0.133 0.204 inch TYP. MAX. 0.094 0.043 0.031 0.141 0.212 0.035 0.082 0.023 0.023 0.244 0.260 0.181 0.397 0.120 0.039
H
A
C
L3
L2 L4
D
L B3 B =G=
= =
= =
= =
= =
B2
B1
B4
E
L1
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1
2
3
C1
A1
L4941
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specificationsmentioned in this publication are subject to change without notice. This publication supersedes and r eplaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use ascritical componentsin life s upport devices or systems without express written approval of SGS-THOMSON Microelectonics. © 1994 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A
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