L4901A

® L4901A DUAL 5V REGULATOR WITH RESET . . . . . . . . . . . . OUTPUT CURRENTS : I01 = 400mA I 0 2 = 400mA 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 HIGH OUTPUT TRANSISTORS SO A PROTECTION SHORT CIRCUIT AND THERMAL OVERLOAD PROTECTION HEPTAWATT (Vertical) (Plastic Package) ORDERING NUMBER : L4901A DESCRIPTION The L4901A 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 1/10 L4901A PIN DESCRIPTION N° 1 2 3 4 5 Name Input 1 Input 2 Timing Capacitor GND Reset Output Output 2 Output 1 Function Low Quiescent Current 400mA Regulator Input. 400mA 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 decharged. Common Ground. When pin 3 reaches 5V the reset output is switched high. 5V Therefore tRD = Ct ( ); tRD (ms) = Ct (nF) 10µA 5V – 400mA Regulator Output. Enabled if Vo 1 > VRT and VIN 2 > VIT. If Reg. 2 is switched-OFF the C02 capacitor is discharged. 5V – 400mA regulator output with Low leakage (in switch-OFF co...