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| L4805-L4885-L4892 L4808-L4810-L4812 VERY LOW DROP VOLTAGE REGULATORS .I .400mAOUTPUTCURRENT .LOWQUI .REVERSEPOLARI .OVERVOLTAGEPROTECTI .FOLDBACKCURRENTLI .THERMALSHUTDOWN DESCRIPTION NPUT/OUTPUT DROP TYP. 0.4V ESCENT CURRENT TY PROTECTION ON ( 60V) MITING L4800 series devices are voltage regulators with a very low voltage drop (typically 0.4V at full rated current), output current up to 400mA, low quiescent current and comprehensiveon-chip protection.These devices are protected against load dump and field decay transients of 60V, polarity reversal and overheating. A foldback current limiter protects against load short circuits. Available in 5V, 8.5V, 9.2V,10V and12V versions (all 4%, TI = 25C) these regulators are designed for automotive, industrial and consumer applications where low consumption is particularly important. BLOCK DIAGRAM SO T-82 TO-220 In automotive applications the L4805 is ideal for 5V logic supplies becauseit can operateeven when the batteryvoltage falls below 6V. In battery backup and standby applications the low consumption of these devices extends battery life. March 1992 1/7 L4805-L4808-L4885-L4892-L4810-L4812 ABSOLUTE MAXIMUM RATINGS Symbol VI DC Input Voltage DC Input Reverse Voltage Transient Input Overvoltages : Load Dump : 5ms < Trise < 10ms, Parameter Value + 35 - 18 60 Unit V V V f Fall Time Constant = 100ms, R source < 0.5 Field Decay : 5ms < tfall < 10ms, Rsource < 10 - 60 V r Rise Time Constant = 33ms Tj, Tstg Junction and Storage Temperature Range - 55 to + 150 C THERMAL DATA Symbol R th j-case R th j-amb Parameter Thermal Resistance Junction-case Thermal Resistance Junction-ambient Max. Max. SOT82 8 100 TO220 4 75 Unit C/W C/W PIN CONNECTION (top view) Order Codes TO-220 L4805CV L4808CV L4885CV L4892CV L4810CV L4812CV SOT-82 L4805CX L4808CX L4885CX L4892CX L4810CX L4812CX Output Voltage 5V 8V 8.5 V 9.2 V 10 V 12 V TEST AND APPLICATION CIRCUIT The output capacitor is required for stability. Though the 100 F shown is the minimum recommended value, actual size and type may vary depending upon the application load and temperature range. Capacitor effectiveseries resistance (ESR) also factors in the IC stability. Since ESR varies from one brand to the next,some bench work may be required to determine the minimum capacitor value to use in production. Worst-case is usually determined at the minimum ambient temperature and maximum load expected. Output capacitors can be increased in size to any desired value above the minimum. One possible purpose of this would be to maintain the output voltages during brief conditions of negative input transients that might be characteristics of a particular system. 2/7 Capacitors must also be rated at all ambient temperature expected in the system. Many aluminum type electrolytics will freeze at temperatures less than - 30 C, reducing their effective capacitance to zero. To maintain regulator stability down to - 40 C, capacitors rated at that temperature (such as tantalums) must be used. L4805-L4808-L4885-L4892-L4810-L4812 ELECTRICAL CHARACTERISTICS (VI = 14.4V; CO = 100F; Tj = 25C unless otherwise specified.) Symbol VO Parameter Output Voltage T est Con di tio n IO = 5mA to 400mA (L4805) IO = 5mA to 400mA (L4808) IO = 5mA to 400mA (L4810) IO = 5mA to 400mA (L4812) IO = 5mA to 400mA (L4885) IO = 300mA (L4892) VI VO/VO VO/VO VI - VO Iq Operating Input Voltage Line Regulation Load Regulation Dropout Voltage Quiescent Current VI = 13 to 26V; IO = 5mA IO = 5 to 400mA* IO = 400mA* IO = 150mA IO = 0mA IO = 150mA IO = 400mA* VO T*VO SVR IO ISC Temperature Output Voltage Drift Supply Voltage Rejection Max Output Current Output Short Circuit Current (fold back condition) IO = 350mA; f = 320Hz; CO = 100F; VI = VO +3V+2Vpp 1 3 0.4 0.2 0.8 25 65 0.1 60 800 350 500 Min. 4.80 7.68 8.16 8.83 9.60 11.50 Typ. 5.00 8.00 8.50 9.20 10.00 12.00 Max. 5.20 8.32 8.84 9.57 10.40 12.50 26 10 15 0.7 0.4 2 45 90 Unit V V V V V V V mV/V mV/V V V mA mA mA mV C*V dB mA mA * only for L4892 the current test conditions is IO = 300mA ELECTRICAL CHARACTERISTICS (VI = 14.4V; CO = 100F; Tj = -40 to 125C (note 1) unless otherwise specified.) Symbol VO Parameter Output Voltage T est Con di tio n IO = 5mA to 400mA (L4805) IO = 5mA to 400mA (L4808) IO = 5mA to 400mA (L4810) IO = 5mA to 400mA (L4812) IO = 5mA to 400mA (L4885) IO = 300mA (L4892) VI VO/VO VO/VO VI - VO Iq Operating Input Voltage Line Regulation Load Regulation Dropout Voltage Quiescent Current see note 2 VI = 14 to 26V; IO = 5mA IO = 5 to 400mA* IO = 400mA* IO = 150mA IO = 0mA IO = 150mA IO = 400mA* IO ISC Max Output Current Output Short Circuit Current (fold back condition) 2 5 0.5 0.25 1.2 40 80 870 230 Min. 4.70 7.50 8.00 8.65 9.40 11.30 Typ. 5.00 8.00 8.50 9.20 10.00 12.00 Max. 5.30 8.50 9.00 9.75 10.60 12.70 26 15 25 0.9 0.5 3 70 140 Unit V V V V V V V mV/V mV/V V V mA mA mA mA mA Notes : 1. This limits are guaranteed by design, correlation and statistical control on production samples over the indicated temperature and supply voltage ranges.. 2. For a DC voltage 26V < Vi < 35V the device is not operating. 3/7 L4805-L4808-L4885-L4892-L4810-L4812 Figure 1: Dropout Voltage vs. Output Current Figure 2: Quiescent Current vs. Output Current Figure 3: Output Voltage vs. Temperature Figure 4: Foldback Current Limiting(L4805) Figure 5: Preregulator for Distributed Supplies 4/7 L4805-L4808-L4885-L4892-L4810-L4812 SOT82 PACKAGE MECHANICAL DATA DIM. MIN. A B b b1 C c1 D e e3 F H 7.4 10.5 0.7 0.49 2.4 1.2 15.7 2.2 4.4 3.8 2.54 mm TYP. MAX. 7.8 10.8 0.9 0.75 2.7 MIN. 0.291 0.413 0.028 0.019 0.094 0.047 0.618 0.087 0.173 0.150 0.100 inch TYP. MAX. 0.307 0.425 0.035 0.030 0.106 5/7 L4805-L4808-L4885-L4892-L4810-L4812 TO220 PACKAGE MECHANICAL DATA DIM. MIN. A C D D1 E F F2 G H2 H3 L2 L3 L5 L6 L7 Dia 26.3 2.6 15.1 6 3.65 10.05 16.2 26.7 27.1 3 15.8 6.6 3.85 1.035 0.102 0.594 0.236 0.144 2.4 1.2 0.35 0.8 1.15 4.95 5.08 mm TYP. MAX. 4.8 1.37 2.8 1.35 0.55 1.05 1.4 5.21 10.4 10.4 0.396 0.638 1.051 1.067 0.118 0.622 0.260 0.152 0.094 0.047 0.014 0.031 0.045 0.195 0.200 MIN. inch TYP. MAX. 0.189 0.054 0.110 0.053 0.022 0.041 0.055 0.205 0.409 0.409 6/7 L4805-L4808-L4885-L4892-L4810-L4812 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. (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. 7/7 |
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