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| L387A VERY LOW DROP 5V REGULATOR WITH RESET .PRECI .VERYLOWDROPOUTVOLTAGE .OUTPUTCURRENTI .POWER.HI SE OUTPUT VOLTAGE (5 V 4 %) N EXCESS OF 500mA ON, POWER-OFF INFORMATION (RESET FUNCTION) GH NOISE IMMUNITY ON RESET DELAY CAPACITOR DESCRIPTION The L387A is a very low drop voltage regulator in a Pentawatt(R) package specially designed to provide stabilized 5V supplies in consumer and industrial applications. Thanks to its very low input/output voltage drop this device is very useful in battery powered equipment, reducing consumption and prolonging battery life. A reset output makes the L387A particularly suitable for microprocessor systems. This output provides a reset signal when power is applied (after an external programmable delay) and goes low when ABSOLUTE MAXIMUM RATINGS Symbol Vi Tj, Tstg D.C. Input Voltage Junction and Storage Temperature Range Parameter Pentawatt (R) ORDERING NUMBER : L387A power is removed, inhibiting the microprocessor. An hysteresis on reset delay capacitor raises the immunity to the ground noise. Value 35 -55 to 150 Unit V C APPLICATION CIRCUIT * Min 33 F and max. ESR 3 over temperature range. October 1991 1/6 L387A PIN CONNECTION (Top views) BLOCK DIAGRAM THERMAL DATA Rth j-c a s e Thermal Resistance Junction-case Max 4 C/W 2/6 L387A ELECTRICAL CHARACTERISTICS (refer to the test circuit, Vi = 14.4 V, Tj = 25 C, Co = 100 F; unless otherwise specified) Symbol Vo VI Vo Vo VI - Vo Parameter Output Voltage Operating Input Voltage Line Regulation Load Regulation Dropout Voltage Test Conditions Io = 5 mA to 500 mA Tj = 25 C - 40 Tj 125 C (*), Over Full T Range (- 40 to 125 C) (see note **) Vi = 6 V to 26 V Io = 5 mA to 500 mA VO = V O NOM - 100 mV Io = 350 mA Io = 500 mA Io = 0 mA Io = 150 mA Io = 350 mA Io = 500 mA Vi = 6.2 V Vo T SVR ISC VR Temperature Output Voltage Drift Supply Voltage Rejection Output Short Circuit Current Reset Output Voltage IR = 3 mA 1 < Vo < 4.70 V IR = 16 mA 1.5 < Vo < 4.75 V Over Full T (- 40 C Tj 125 C) Vo in Regulation VR = 5V Over Full T Range Cd = 100 nF Over Full T Range Vo @ Reset out H to L Transition, Over Full T Range Charging Current (current generator) Power on VoThreshold Comparator Threshold (pin 4) Hysteresis Voltage V4 = 3 V Vo @ Reset out L to H Transition , Over Full T Range V4 @ Reset out H to L Transition V4 @ Reset out L to H Transition Over Full T Range 3.2 3.7 450 4.75 10 25 Vo - 0.15 20 30 Io = 350 mA C o = 100 F f = 120 Hz Vi = 12 V 5 Vpp 1.2 Io = 500 mA Io = 5 mA 5 15 0.40 0.60 5 20 60 100 160 - 0.5 60 1.6 0.5 0.8 50 A V V A ms V A V V V mV Min. 4.80 4.75 Typ. 5.00 5.00 Max. 5.20 5.25 26 50 60 0.65 0.8 15 35 100 160 180 Unit V V V mV mV V V mA mA mA mA mA mV/C Iq Quiescent Current IR td VRT (off) IC4 VRT (on) V4 VH Reset Output Leakage Current Delay Time for Reset Output VRT (off) Vo + 0.05 V - 0.04 V 3.9 4.3 (*) For a DC voltage 26 < Vi < 37 V the device is not operating. (**) 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. 3/6 L387A Figure 1 : Dropout Voltage vs. Output Current. Figure 2 : Quiescent Current vs. Output Current. Figure 3 : Output Voltage vs. Temperature. 4/6 L387A PENTAWATT PACKAGE MECHANICAL DATA DIM. A C D D1 E F F1 G G1 H2 H3 L L1 L2 L3 L5 L6 L7 M M1 Dia 3.65 2.6 15.1 6 4.5 4 3.85 0.144 10.05 17.85 15.75 21.4 22.5 3 15.8 6.6 0.102 0.594 0.236 0.177 0.157 0.152 2.4 1.2 0.35 0.8 1 3.4 6.8 10.4 10.4 0.396 0.703 0.620 0.843 0.886 0.118 0.622 0.260 mm MIN. TYP. MAX. 4.8 1.37 2.8 1.35 0.55 1.05 1.4 0.094 0.047 0.014 0.031 0.039 0.126 0.260 0.134 0.268 MIN. inch TYP. MAX. 0.189 0.054 0.110 0.053 0.022 0.041 0.055 0.142 0.276 0.409 0.409 L E L1 M1 A C D1 L2 L5 L3 H3 D Dia. F L6 H2 L7 F1 G G1 M 5/6 L387A Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics 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 SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. PENTAWATT(R) is registered trademarks of SGS-THOMSON Microelectronics (c) 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 - Thaliand - United Kingdom - U.S.A. 6/6 |
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