l4957 STMicroelectronics, l4957 Datasheet
l4957
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l4957 Summary of contents
Page 1
... PLIES GRAPHIC & SOUND CARDS LOW VOLTAGE LOGIC SUPPLIES POST REGULATOR FOR SMPS DESCRIPTION The L4957 devices are Ultra Low Drop Output lin- ear regulators with an internal N-channel MOS of 200m particulary suitable for low voltage/low dropout applications. Operating with a input voltage from 3V to 6.5V they are capable to deliver ...
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... L4957 ABSOLUTE MAXIMUM RATINGS Symbol V Supply Input Voltage IN T Junction Temperature i T Storage Temperature stg PINS CONNECTION D98IN838B Versawatt (TO220) BLOCK DIAGRAM REF PRE REGULATOR 2/7 Parameter 3 OUT 2 GND IN 1 D2PAK CURRENT CHARGE LIMIT PUMP WITH FOLDBACK + BUFFER ...
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... Regulated output voltage. A minimum bypass capacitor required to insure stability. THERMAL DATA Symbol Parameter R Thermal Resistance Junction-case th j-case R Thermal Resistance Junction-ambient th j-amb Thermal Shutdown Thermal Hysteresis L4957 - ELECTRICAL CHARACTERISTICS (T = Specifications referred to T from +125 C. J Symbol Parameter V Operating Supply Voltage IN (1) V Output Voltage (1) For L4957V1 ...
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... L4957 Figure 3: Maximum Output Current vs. Junction Temperature O utput C urrent [ (Vin-Vout) > pin -40 - 100 120 140 160 ulsed tecnique ha s been used Figure 5: Ripple Rejection vs. Frequency ...
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... F 0.61 0.88 0.024 F1 1.14 1.70 0.044 F2 1.14 1.70 0.044 G 4.95 5.15 0.194 G1 2.40 2.70 0.094 H2 10.0 10.4 0.393 L2 16.4 0.645 L4 13.0 14.0 0.511 L5 2.65 2.95 0.104 L6 15.25 15.75 0.600 L7 6.20 6.60 0.244 L9 3.50 3.93 0.137 M 2.6 0.102 Dia 3.75 3.85 0.147 OUTLINE AND MAX. MECHANICAL DATA 0.181 0.051 0.107 0.027 0.034 0.067 0.067 0.203 0.106 0.409 0.551 0.116 0.620 0.260 0.154 Versawatt (TO220) 0.151 L4957 TO220MEC 5/7 ...
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... L4957 DIMENSIONS REF. Millimeters Inches Min. Typ. Max. Min. Typ. Max. A 4.30 4.60 0.169 A1 2.49 2.69 0.098 A2 0.03 0.23 0.001 B 0.70 0.93 0.027 B2 1.25 1.40 0.049 0.055 C 0.45 0.60 0.017 C2 1.21 1.36 0.047 D 8.95 9.35 0.352 E 10.00 10.28 0.393 G 4.88 5.28 0.192 L 15.00 15.85 0.590 L2 1.27 1.40 0.050 L3 1.40 1.75 0.055 R 0.40 0.016 2.0 MIN. FLAT ZONE 6/7 OUTLINE AND MECHANICAL DATA 0.181 0.106 ...
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... The ST logo is a registered trademark of STMicroelectronics 2000 STMicroelectronics – Printed in Italy – All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http://www.st.com L4957 7/7 ...