L387A_03

® L 387A 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 ABSOLUTE MAXIMUM RATINGS Symbol Vi Tj, Tstg Parameter D.C. Input Voltage Pentawatt® ORDERING NUMBER : L387A Junction and Storage Temperature Range APPLICATION CIRCUIT bs O let o od Pr e uc (s) t so Ob - power is removed, inhibiting the microprocessor. An hysteresis on reset delay capacitor raises the immunity to the ground noise. te le ro P uc d s) t( Value 35 –55 to 150 Unit V °C * Min 33 µF and max. ESR ≤ 3 Ω over temperature range. July 2003 1/6 L387A PIN CONNECTION (Top views) BLOCK DIAGRAM THERMAL DATA Rth j-c a s e bs O let o Thermal Resistance Junction-case Pr e du o (s) ct so Ob - te le ro P uc d s) t( Max 4 °C/W 2/6 L387A ELECTRICAL CHARACTERISTICS (refer to the test circuit, Vi = 14.4 V, Tj = 25 °C, Co = 100 µF; unless otherwise specified) Symbol Parameter Output Voltage Vo VI ∆Vo ∆Vo VI – Vo 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 Io = 150 Io = 350 Io = 500 Vi = 6.2 V ∆ Vo ∆T SVR ISC VR Temperature Output Voltage Drift Supply Voltage Rejection Output Short Circuit Current Reset Output Voltage Io = 350 mA Co = 100 µF f = 120 Hz Vi = 12 V ± 5 Vpp mA mA mA mA Io = 5 m A 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 5 15 0.40 0.60 5 20 60 100 160 – 0.5 Iq Quiescent Current Io = 500 mA IR td VRT (off) IC4 VRT (on) V4 VH Reset Output Leakage Current Delay Time for Reset Output 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 Charging Current (current generator) bs O (*) 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. let o Power on VoThreshold Comparator Threshold (pin 4) Hysteresis Voltage Pr e od ct u Vo @ Reset out H to L Transition, Over Full T Range V4 = 3 V (s) so Ob - te le ro P 1.2 uc d s) t( A V V mA mV/°C 60 1.6 0.5 0.8 50 µA ms V 25 4.75 10 Vo – 0.15 20 30 µA V V V mV 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 VRT (off) Vo + 0.05 V – 0.04 V 3.9 4.3 450 3/6 L387A F igure 1 : Dropout Voltage vs. Output Current. Figure 2 : Quiescent Current vs. Output Current. Figure 3 : Output Voltage vs. Temperature. bs O let o Pr e du o (s) ct so Ob - te le ro P uc d s) t( 4/6 L387A mm TYP. inch TYP. DIM. A C D D1 E E1 F F1 G G1 H2 H3 L L1 L2 L3 L4 L5 L6 L7 L9 L10 M M1 V4 V5 Dia MIN. 2.4 1.2 0.35 0.76 0.8 1.0 3.2 6.6 10.05 17.55 15.55 21.2 22.3 2.6 15.1 6.0 2.1 4.3 4.23 3.75 3.4 6.8 17.85 15.75 21.4 22.5 4.5 4.0 3.65 MAX. MIN. 4.8 1.37 2.8 0.094 1.35 0.047 0.55 0.014 1.19 0.030 1.05 0.031 1.4 0.039 3.6 0.126 7.0 0.260 10.4 10.4 0.396 18.15 0.691 15.95 0.612 21.6 0.831 22.7 0.878 1.29 3.0 0.102 15.8 0.594 6.6 0.236 2.7 0.008 4.8 0.17 4.75 0.167 4.25 0.148 40˚ (typ.) 90˚ (typ.) 3.85 0.144 0.134 0.268 0.703 0.620 0.843 0.886 0.178 0.157 MAX. 0.189 0.054 0.110 0.053 0.022 0.047 0.041 0.055 0.142 0.276 0.409 0.409 0.715 0.628 0.850 0.894 0.051 0.118 0.622 0.260 0.106 0.189 0.187 0.167 OUTLINE AND MECHANICAL DATA Weight: 2.00gr 0.152 L L1 A C bs O let o H3 od Pr e L5 Dia. L9 L10 L7 D1 ct u (s) L2 L3 so Ob D V5 te le E M1 Pentawatt V ro P uc d s) t( M H2 F E V4 E1 G G1 F1 L4 H2 F V4 L6 RESIN BETWEEN LEADS PENTVME 0015981 5/6 L387A bs O Information furnished is believed to be accurate and reliable. However, STMicroelectronics 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 STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. 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