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L4903

STMicroelectronics
Part Number L4903
Manufacturer STMicroelectronics
Description DUAL 5V REGULATOR WITH RESET AND DISABLE FUNCTIONS
Published Mar 22, 2005
Detailed Description L4903 DUAL 5V REGULATOR WITH RESET AND DISABLE FUNCTIONS . . . . . . . . . . . . PRELIMINARY DATA OUTPUT CURRENTS : I...
Datasheet PDF File L4903 PDF File

L4903
L4903

Overview
L4903 DUAL 5V REGULATOR WITH RESET AND DISABLE FUNCTIONS .
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PRELIMINARY DATA OUTPUT CURRENTS : I01 = 50mA I02 = 100mA FIXED PRECISION OUTPUT VOLTAGE 5V ± 2 % RESET FUNCTION CONTROLLED BY INPUT VOLTAGE AND OUTPUT 1 VOLTAGE RESET FUNCTION EXTERNALLY PROGRAMMABLE TIMING RESET OUTPUT LEVEL RELATED TO OUTPUT 2 OUTPUT 2 INTERNALLY SWITCHED WITH ACTIVE DISCHARGING OUTPUT 2 DISABLE LOGICAL INPUT LOW LEAKAGE CURRENT, LESS THAN 1µA AT OUTPUT 1 INPUT OVERVOLTAGE PROTECTION UP TO 60V RESET OUTPUT NORMALLY LOW OUTPUT TRANSISTORS SOA PROTECTION SHORT CIRCUIT AND THERMAL OVERLOAD PROTECTION Minidip ORDERING NUMBERS : L4903 DESCRIPTION The L4903 is a monolithic low drop dual 5 V regulator designed mainly for supplying microprocessor systems.
Reset, data save functions and remote switch on/off control can be realized.
PIN CONNECTION July1993 1/8 L4903 PIN FUNCTIONS N° 1 2 3 4 5 6 Name Input 1 Input 2 Timing Capacitor GND Disable Input Reset Output Function Low Quiescent Current 50mA Regulator Input 100mA Regulator Input.
If Reg.
2 is switched-ON the delay capacitor is charged with a 10µA constant current.
When Reg.
2 is switched-OFF the delay capacitor is discharged.
Common Ground A high level (> VDT) disables output Reg.
2.
When pin 3 reaches 5V the reset output is switched low.
5V ) ; tRD (ms) = Ct (nF).
Therefore tRD = C t ( 10µA 5V – 100mA Regulator Output.
Enabled if Vo 1 > VRT.
DISABLE INPUT < VDT and VIN 2 > VIT.
If Reg.
2 is switched-OFF the C02 capacitor is discharged.
5V – 50mA regulator output with low leakage in switch-OFF condition.
7 8 Output 2 Output 1 BLOCK DIAGRAM SCHEMATIC DIAGRAM 2/8 L4903 ABSOLUTE MAXIMUM RATINGS Symbol VIN Vt Ptot Tstg, Tj Parameter DC Input Voltage Transient Input Overvoltage (t = 40ms) Power Dissipation at Tamb = 50°C Storage and Junction Temperature Value 24 60 1 – 40 to 150 Unit V V W °C THERMAL DATA Symbol Rth (j-pin) R th (j-a) Parameter Thermal Resistance Junction-pin 4 Thermal Resistance Junction-ambie...


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