Maker : STMicroelectronics
Part No. : L4925

  Datasheet PDF : L4925.pdf
  Cross Reference : L4925 Cross Reference
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Shortcut : L4920  L4921  L4922  L4923  L4925  L4925PD 

Product Information

® 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 2µ RES D95AT151 June 2000 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 V SDC 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 60 3.5 SO 20 77 to 97 Unit °C/W °C/W 2/8 L4925 ELECTRICAL CHARACTERISTICS (VS =14V Tj =–40 to 125°C 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 V OL 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 µA mA RESET Symbol V RT VRTH tRD tRR V RL 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 C T = 100nF; tR > 100µs C T = 100nF; R RES = 10KΩ to VO; VS => 3V VRES = 5V 2 200 Test Condition Min. 4.5 50 60 100 100 5 Typ. Max. 5.2 200 140 30 0.4 1 Unit V mV ms µs V µA V mV APPLICATION CIRCUIT DIAGRAM Vz PREREGULATOR 5V VBAT CS VS + = 2V GND REG RESET VREF 1.23V Vo Vout Co L4925N Vz 2µ CT RES RES D95AT153 For stability: CS > 1µF; CO > 10µF;ESR < 2.5Ω at 10 KHz Recommended for application: CS =CO = 10µF to 100µF 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/µs. For supply voltage lower than 8V, supply transients of more than 0.4V/µs. 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 require...

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