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| (R) L4925 VERY LOW DROP VOLTAGE REGULATOR OPERATING DC SUPPLY VOLTAGE RANGE 6V TO 28V TRANSIENT SUPPLY VOLTAGE UP TO 40V EXTREMELY LOW QUIESCENT CURRENT HIGH PRECISION OUTPUT VOLTAGE OUTPUT CURRENT CAPABILITY UP TO 500mA VERY LOW DROPOUT VOLTAGE LESS THAN 0.6V RESET CIRCUIT SENSING THE OUTPUT VOLTAGE PROGRAMMABLE RESET PULSE DELAY WITH EXTERNAL CAPACITOR THERMAL SHUTDOWN AND SHORT CIRCUIT PROTECTIONS DESCRIPTION The L4925 is a monolithic integrated 5V voltage regulator with a very low dropout output and addiBLOCK DIAGRAM Pentawatt PowerSO20 ORDERING NUMBERS: L4925 (Pentawatt) L4925PD (PowerSO20) tional functions such as power-on reset and programmable reset delay time. It is designed for supplying microcomputer controlled systems especially in automotive applications. Vz PREREGULATOR 5V VS CS + = 2V GND REG RESET VREF 1.23V VO L4925N CT Vz 2 RES D95AT151 October 2003 1/8 This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice. L4925 ABSOLUTE MAXIMUM RATINGS Symbol VSDC VSTR IO VO VRES IRES Tstg Tj Tj-SD NOTE: The circuit is ESD protected according to MIL-STD-883C. According to ISO/DIS 7637 the transients must be clamped with external circuitry (see Application Circuit). Parameter DC Operating Supply Voltage Transient Supply Voltage (t < 1s) Output Current Output Voltage Output Voltage Output Current Storage Temperature Operating Junction Temperature Thermal Shutdown-Junction Temperature Value 28 40 internally limited 20 20 5 -55 to 150 -40 to 150 165 Unit V V V V mA C C C CONNECTION DIAGRAM N.C. N.C. VS VS N.C. N.C. RES N.C. N.C. GND 1 2 3 4 5 6 7 8 9 10 D95AT152 20 19 18 17 16 15 14 13 12 11 N.C. N.C. N.C. VOUT VOUT N.C. CT N.C. N.C. N.C. THERMAL DATA Symbol Rth j-amb Rth j-case Parameter Thermal resistance junction to ambient Thermal resistance junction to case max. max. Pentawatt 20 to 60 3.5 PSO 20 15 to 60 3.5 Unit C/W C/W 2/8 L4925 ELECTRICAL CHARACTERISTICS (VS =14V Tj =-40 to 125C unless otherwise specified; Symbol VO VO VDP VIO Parameter Output Voltage Output Voltage Dropout Voltage Input to Output Voltage Difference in Undervoltage Condition Line Regulation Load Regulation Current Limit Quiescent Current Quiescent Current Test Condition VI = 6 to 28V; IO = 1 to 500mA VI = 35V; T <1s; IO = 1 to 500mA IO = 100mA IO = 500mA VI = 4V; IO = 100mA 0.2 0.3 Min. 4.90 Typ. 5 Max. 5.10 5.50 0.3 0.6 0.5 Unit V V V V V VOL VOLO ILIM IQSE IQ VI = 6 to 28V; IO = 1 to 1mA IO = 1 to 500mA VO = 4.5V; VO = 0; Foldback characteristic IO = 0.3mA IO = 500mA 550 1000 250 190 10 50 1500 360 20 mV mV mA mA A mA RESET Symbol VRT VRTH tRD tRR VRL IRH VCTth VCTth hy Parameter Reset Threshold Voltage Reset Threshold Reset Pulse Delay Reset Reaction Time Reset Output LOW Voltage Reset Output HIGH Leakage Current Delay Comparator Threshold Delay Comparator Threshold Hysteresis CT = 100nF; tR > 100s CT = 100nF; RRES = 10K to VO; VS => 3V VRES = 5V 2 200 Test Condition Min. 4.5 50 60 Typ. 100 100 5 Max. 5.2 200 140 30 0.4 1 Unit V mV ms s V A V mV APPLICATION CIRCUIT DIAGRAM Vz PREREGULATOR 5V VBAT CS VS + = 2V GND REG RESET VREF 1.23V Vo Vout Co L4925N Vz 2 CT RES RES D95AT153 For stability: CS > 1F; CO > 10F;ESR < 2.5 at 10 KHz Recommended for application: CS =CO = 10F to 100F 3/8 L4925 APPLICATION NOTE SUPPLY VOLTAGE TRANSIENTS High supply voltage transients can cause a reset output signal disturbation. For supply voltage greater than 8V the circuit shows a high immunity of the reset output against supply transients of more than 100V/s. For supply voltage lower than 8V, supply transients of more than 0.4V/s. can cause a reset signal disturbation. Foldback Characteristics Of Vo FUNCTIONAL DESCRIPTION The L4925 is a monolithic integrated voltage regulator, based on the STM modular voltage regulator approach. Several outstanding features and auxiliary functions are implemented to meet the requirements of supplying microprocessor systems in automotive applications. Nevetrheless, it is suitable also in other applications where the present functions are required. The modular approach of this device allows to get easily also other features and functions when required. VOLTAGE REGULATOR The voltage regulator uses an Isolated Collector Vertical PNP transistor as a regulating element. With this structure very low dropout voltage at currents up to 500mA is obtained. Figure 1: Output Voltage vs. Input Voltage The dropout operation of the standby regulator is maintained down to 3V input supply voltage. The output voltage is regulated up to the transient input supply voltage of 35V. With this feature no functional interruption due to overvoltage pulses is generated. The typical curve showing the standby output voltage as a function of the input supply voltage is shown in fig. 1. The current consumption of the device (quiescent current) is less than 250A. To reduce the quiescent current peak in the undervoltage region and to improve the transient response in this region, the dropout voltage is controlled. The quiescent current as a function of the supply input voltage is shown in fig. 2. Figure 2: Quiescent Current vs. Supply Voltage 4/8 L4925 RESET CIRCUIT The block circuit diagram of the reset circuit is shown in Figure 3. The reset circuit supervises the output voltage. The reset threshold of 4.5V is defined with the internal reference voltage and standby output divider. The reset pulse delay time tRD, is defined with the charge time of an external capacitor CT: tRD= Figure 3 CT x 2V 2A The reaction time of the reset circuit originates from the discharge time limitation of the reset capacitor CT and it is proportional to the value of CT. The reaction time of the reset circuit increases the noise immunity.Standby output voltage drops below the reset threshold only a bit longer than the reaction time results in a shorter reset delay time. The nominal reset delay time will be generated for standby output voltage drops longer than approximately 50s. The typical reset output waveforms are shown in Figure 4. Figure 4 5/8 L4925 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 Pentawatt V 0.152 L L1 E M1 A C D1 L5 L2 L3 D V5 H2 F E V4 E1 M H3 Dia. L9 L10 L7 L6 L4 F1 H2 F G G1 V4 RESIN BETWEEN LEADS PENTVME 0015981 6/8 L4925 DIM. A a1 a2 a3 b c D (1) D1 E e e3 E1 (1) E2 E3 G H h L N S T 10 0.8 5.8 0 15.5 10.9 0 0.4 0.23 15.8 9.4 13.9 1.27 11.43 11.1 2.9 6.2 0.1 15.9 1.1 1.1 0.031 8 (typ.) 8 (max.) 0.394 0.228 0.000 0.610 0.429 0.1 mm MIN. TYP. MAX. 3.6 0.3 3.3 0.1 0.53 0.32 16 9.8 14.5 0.000 0.016 0.009 0.622 0.370 0.547 0.050 0.450 0.437 0.114 0.244 0.004 0.626 0.043 0.043 JEDEC MO-166 0.004 MIN. inch TYP. MAX. 0.142 0.012 0.130 0.004 0.021 0.013 0.630 0.386 0.570 Weight: 1.9gr OUTLINE AND MECHANICAL DATA (1) "D and E1" do not include mold flash or protusions. - Mold flash or protusions shall not exceed 0.15mm (0.006") - Critical dimensions: "E", "G" and "a3". PowerSO20 N N a2 b e A R c DETAIL B a1 E DETAIL A DETAIL A e3 H lead D a3 DETAIL B 20 11 Gage Plane 0.35 slug -C- S E2 T E1 BOTTOM VIEW L SEATING PLANE G C (COPLANARITY) E3 1 10 h x 45 PSO20MEC D1 0056635 7/8 L4925 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. Specifications 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. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners (c) 2003 STMicroelectronics - All rights reserved STMicroelectronics GROUP OF COMPANIES Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States www.st.com 8/8 |
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