L387A VERY LOW DROP 5V REGULATOR WITH RESET .. .. . PRECISE OUTPUT VOLTAGE (5 V ± 4 %) VERY LOW DROPOUT VOLTAGE OUTPUT CURRENT IN EXCESS OF 500mA POWER-ON, POWER-OFF INFORMATION (RESET FUNCTION) HIGH NOISE IMMUNITY ON RESET DELAY CAPACITOR DESCRIPTION The L387A is a very low drop voltage regulator in a Pentawatt 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 Pentawatt ORDERING NUMBER : L387A power is removed, inhibiting the microprocessor. An hysteresis on reset delay capacitor raises the immunity to the ground noise. ABSOLUTE MAXIMUM RATINGS Symbol Vi Tj, Tstg Parameter D.C. Input Voltage Junction and Storage Temperature Range Value Unit 35 V –55 to 150 °C APPLICATION CIRCUIT * Min 33 µF and max. ESR ≤ 3 Ω over temperature range. October 1991 1/6 L387A PIN CONNECTION (Top views) BLOCK DIAGRAM THERMAL DATA Rth 2/6 j-c a s e Thermal Resistance Junction-case Max 4 °C/W L387A ELECTRICAL CHARACTERISTICS (refer to the test circuit, Vi = 14.4 V, Tj = 25 °C, Co = 100 µF; unless otherwise specified) Symbol Test Conditions Min. Typ. Max. Unit Vo Output Voltage Parameter Io = 5 mA to 500 mA Tj = 25 °C – 40 ≤ Tj ≤ 125 °C 4.80 4.75 5.00 5.00 5.20 5.25 V V VI Operating Input Voltage (*), Over Full T Range (– 40 to 125 °C) (see note **) 26 V ∆Vo Line Regulation Vi = 6 V to 26 V ∆Vo Load Regulation Io = 5 mA to 500 mA VI – Vo Dropout Voltage VO = V O NOM – 100 mV Io = 350 mA Io = 500 mA Iq Io = 5 mA Quiescent Current Io = 0 mA Io = 150 mA Io = 350 mA Io = 500 mA Vi = 6.2 V ∆ Vo ∆T Temperature Output Voltage Drift SVR Supply Voltage Rejection ISC Output Short Circuit Current VR Reset Output Voltage IR td Io = 500 mA mV mV 0.40 0.60 0.65 0.8 V V 5 20 60 100 15 35 100 160 mA mA mA mA 160 180 – 0.5 Io = 350 mA C o = 100 µF f = 120 Hz Vi = 12 V ± 5 Vpp mA mV/°C 60 1.2 A 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) 0.5 0.8 V V Reset Output Leakage Current Vo in Regulation VR = 5V Over Full T Range 50 µA Delay Time for Reset Output Cd = 100 nF Over Full T Range Vo @ Reset out H to L Transition, Over Full T Range 25 ms 4.75 Vo – 0.15 V 10 20 Charging Current (current generator) V4 = 3 V Power on VoThreshold Vo @ Reset out L to H Transition , Over Full T Range V4 Comparator Threshold (pin 4) V4 @ Reset out H to L Transition 3.2 V4 @ Reset out L to H Transition 3.7 VH Hysteresis Voltage Over Full T Range VRT (on) 50 60 1.6 VRT (off) IC4 5 15 30 VRT (off) Vo + 0.05 V – 0.04 V 3.9 4.3 450 µA V V V mV (*) 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 3 : Output Voltage vs. Temperature. 4/6 Figure 2 : Quiescent Current vs. Output Current. L387A PENTAWATT PACKAGE MECHANICAL DATA DIM. mm MIN. inch TYP. MAX. MIN. TYP. MAX. 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 F 0.8 1.05 0.031 0.041 F1 1 1.4 0.039 0.055 G 3.4 0.126 0.134 0.142 G1 6.8 0.260 0.268 0.276 H2 H3 10.4 10.05 0.409 10.4 0.396 0.409 L 17.85 0.703 L1 15.75 0.620 L2 21.4 0.843 L3 22.5 0.886 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 M 4.5 0.177 M1 4 0.157 3.65 3.85 0.144 0.152 E L D1 C D M A M1 L1 L2 L3 G G1 L5 H3 H2 L7 F Dia. F1 Dia L6 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 is registered trademarks of SGS-THOMSON Microelectronics 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