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L4904A

STMicroelectronics
Part Number L4904A
Manufacturer STMicroelectronics
Description DUAL 5V REGULATOR WITH RESET
Published Mar 22, 2005
Detailed Description ® L4904A DUAL 5V REGULATOR WITH RESET . . . . . . . . . . . . OUTPUT CURRENTS : I01 = 50mA I 02 = 100mA FIXED PRECISI...
Datasheet PDF File L4904A PDF File

L4904A
L4904A

Overview
® L4904A DUAL 5V REGULATOR WITH RESET .
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OUTPUT CURRENTS : I01 = 50mA I 02 = 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 LOW LEAKAGE CURRENT, LESS THAN 1µA AT OUTPUT 1 LOW QUIESCENT CURRENT (Input 1) INPUT OVERVOLTAGE PROTECTION UP TO 60V RESET OUTPUT NORMALLY HIGH OUTPUT TRANSISTORS SOA PROTECTION SHORT CIRCUIT AND THERMAL OVERLOAD PROTECTION Minidip ORDERING NUMBER : L4904A DESCRIPTION The L4904A is a monolithic low drop dual 5V regulator designed mainly for supplying microprocessor systems.
Reset and data save functions during switch on/off can be realized.
PIN CONNECTION June 2000 1/9 L4904A PIN FUNCTIONS N° 1 2 3 4 5 6 Name Input 1 Input 2 Timing Capacitor GND N.
C.
Reset Output Output 2 Output 1 Function Low Quiescent Current 50mA Regulator Input.
100mA Regulator Input.
If Reg.
2 is switching-ON the delay capacitor is charged with a 10µA constant current.
When Reg.
2 is switched-OFF the delay capacitor is discharged.
Common Ground.
Not connected.
When pin 3 reaches 5V the reset output is switched high.
5V Therefore tRD = Ct ( ); tRD (ms) = Ct (nF).
10µA 5V – 100mA Regulator Output.
Enabled if Vo 1 > VRT and VIN 2 > VIT.
If Reg.
2 is switched-OFF the Co2 capacitor is discharged.
5V – 50mA regulator output with low leakage in switch-OFF condition.
7 8 BLOCK DIAGRAM SCHEMATIC DIAGRAM 2/9 L4904A ABSOLUTE MAXIMUM RATINGS Symbol V IN Io Ptot Tj Parameter DC Input Voltage Transient Input Overvoltage (t = 40ms) Output Current Power Dissipation at Tamb = 50°C Storage and Junction Temperature Value 24 60 Internally Limited 1 – 40 to 150 Unit V V W °C THERMAL DATA Symbol Rth j-amb Parameter Thermal Resistance Junction-ambient Max Value 100 Unit °C/W ELECTRICAL CHARACTERISTICS (VIN = 14.
4V, Tamb = 25oC unless otherwise specified) Symbol ...


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