L4920

L4920 STMICROELECTRONICS | Alldatasheet

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VERY LOW DROP ADJUSTABLE REGULATORS .VERY LOW DROP VOLTAGE .ADJUSTABLE OUTPUT VOLTAGE FROM 1.25V TO 20V .400mA OUTPUT CURRENT .LOW QUIESCENT CURRENT .REVERSE VOLTAGE PROTECTION .+ 60/− 60V TRANSIENT PEAK VOLTAGE PROTECTION .SHORT CIRCUIT PROTECTION WITH FOLD- BACK CHARACTERISTICS .THERMAL SHUT-DOWN

DESCRIPTION

ORDERING NUMBERS : L4920 (Pentawatt) L4921 (Minidip) BLOCK DIAGRAM The L4920and L4921 are adjustable voltage regu- latorswith a verylow voltage drop(0.4V typ. at 0.4A Tj=2 5°C), low quiescent current and comprehen- sive on-chip protection. Thesedevicesareprotectedagainstload dumpand field decay transients, polarity reversal and over heating. A foldbackcurrentlimiter protectsagainstload short circuits. The outputvoltageis adjustablethrough an external divider from 1.25V to 20V. The minimum operating input voltage is 5.2V (T J =2 5°C). Minidip (4 + 4) These regulators are designed for automotive, in- dustrial and consumer applications where low con- sumption is particularly important. In batterybackup and standbyapplications the low consumptionof these devices extends battery life.

Symbol Parameter Value Unit Vi DC Input Operating Voltage DC Reverse Input Voltage Transient Input Overvoltages: Load Dump: 5ms ≤ trise≤ 10ms τf Fall time constant = 100ms R SOURCE ≥ 0.5Ω Field Decay: 5ms ≤ t fall≤ 10ms, RSOURCE ≥ 10Ω τf Rise time constant = 33ms 35 V TJ,T STG Junction and Storage Temperature Range – 55 to 150 °C PIN CONNECTIONS (top view) TEST AND APPLICATION CIRCUIT THERMAL DATA Symbol Parameter Minidip (4 + 4) Pentawatt R th j-amb R th j-pins R th j-case Thermal Resistance Junction-ambient Thermal Resistance Junction-pins Thermal Resistance Junction-case Max Max Max 80 °C/W 15 °C/W 60 °C/W 3.5°C/W C = 100µF is required for stability (ESR≤ 3Ω over T range) R2 = 6.2KΩ . L4920/L4921

(*) Foldback protection. Note : 1. Design limits are guaranteed (but not 100% production tested) over the indicated temperature and supply voltage ranges. These limits are not used to calculate outgoing quality levels. ELECTRICALCHARACTERISTICS (forVI=14.4V,TJ =25°C,VO = 5V,CO =100µF,unlessOtherwiseSpeci- fied) Symbol Parameter Test Condition Min. Typ. Max. Unit VI Operating Input Voltage V O ≥ 4.5V, IO = 400mA V O + 0.7 26 V VREF ≤ VO < 4.5V, IO = 400mA 5.2 26 V VREF Reference Voltage 5.2V < V I < 26V 5mA ≤ IO ≤ 400mA (*) 1.20 1.25 1.30 V ΔV O Line Regulation V O +1 V<V I < 26V, VO ≥ 4.5V IO = 5mA 1 10 mV/V ΔV O Load Regulation 5mA ≤ IO ≤ 400mA (*) VO ≥ 4.5V 3 15 mV/V VD Dropout Voltage I O = 10mA IO = 150mA IO = 400mA 0.05 0.2 0.4 0.4 0.7 V V V I Q Quiescent Current I O = 0mA VO +1 V<V I <26V 0.8 2 mA IO = 400mA (*) VO +1 V<V I <26V 65 90 mA IO Maximal Output Current 800 mA IOSC Short Circuit Output Current (*) 350 500 mA (*) Foldback protection ELECTRICAL CHARACTERISTICS (forVI=14.4V,–40≤ TJ ≤ 125°C (note1), VO = 5V,CO =100µF, unless Otherwise Specified) Symbol Parameter Test Condition Min. Typ. Max. Unit VI Operating Input Voltage V O ≥ 4.5V, IO = 400mA V O + 0.9 26 V VREF ≤ VO < 4.5V, IO = 400mA 5.2 26 V VREF Reference Voltage 5.4V < V I < 26V 1.17 1.25 1.33 V ΔV O Line Regulation V O + 1.2V < VI < 26V, VO ≥ 4.5V IO = 5mA 2 15 mV/V ΔV O Load Regulation 5mA ≤ IO ≤ 400mA (*) VO ≥ 4.5V 5 25 mV/V VD Dropout Voltage I O = 150mA IO = 400mA 0.2 0.4 0.4 0.7 V V IQ Quiescent Current I O = 0mA VO + 1.2V < VI <26V 1,2 3 mA IO = 400mA (*) VO + 1.2V < VI <26V 80 140 mA IO Maximal Output Current 870 mA IOSC Short Circuit Output Current (*) 230 500 mA L4920/L4921

DIM. mm inch A 3.3 0.130 a1 0.7 0.028 B 1.39 1.65 0.055 0.065 B1 0.91 1.04 0.036 0.041 b 0.5 0.020 b1 0.38 0.5 0.015 0.020 D 9.8 0.386 E 8.8 0.346 e 2.54 0.100 e3 7.62 0.300 e4 7.62 0.300 F 7.1 0.280 I 4.8 0.189 L 3.3 0.130 Z 0.44 1.6 0.017 0.063 OUTLINE AND MECHANICAL DATA L4920/L4921

DIM. mm inch A 4.8 0.189 C 1.37 0.054 D 2.4 2.8 0.094 0.110 D1 1.2 1.35 0.047 0.053 E 0.35 0.55 0.014 0.022 E1 0.76 1.19 0.030 0.047 F 0.8 1.05 0.031 0.041 F1 1 1.4 0.039 0.055 H2 10.4 0.409 H3 10.05 10.4 0.396 0.409 L4 1.29 0.051 L5 2.6 3 0.102 0.118 L6 15.1 15.8 0.594 0.622 L7 6 6.6 0.236 0.260 L9 0.2 0.008 V4 40 °(typ.) L A C D1 L2 E MD Dia. F GG 1 F E R R R RESIN BETWEEN LEADS VV V1 B VV OUTLINE AND MECHANICAL DATA L4920/L4921

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the conse- quences 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. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMi- croelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. 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 L4920/L4921