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L4901A

STMicroelectronics
Part Number L4901A
Manufacturer STMicroelectronics
Description DUAL 5V REGULATOR WITH RESET
Published Mar 22, 2005
Detailed Description ® L4901A DUAL 5V REGULATOR WITH RESET . . . . . . . . . . . . OUTPUT CURRENTS : I01 = 400mA I 0 2 = 400mA FIXED PRECI...
Datasheet PDF File L4901A PDF File

L4901A
L4901A

Overview
® L4901A DUAL 5V REGULATOR WITH RESET .
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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 condition).
6 7 BLOCK DIAGRAM SCHEMATIC DIAGRAM 2/10 L4901A ABSOLUTE MAXIMUM RATINGS Symbol V IN Io Tj Parameter DC Input Voltage Transient Input Overvoltage (t = 40ms) Output Current Storage and Junction Temperature Value 24 60 Internally Limited – 40 to 150 °C Unit V V THERMAL DATA Symbol R th (j-c) Parameter Thermal Resistance Junction-case Max.
Value 4 Unit °C/W ELECTRICAL CHARACTERISTICS (VIN = 14, 4V, Tamb = 25°C unless otherwise specified) Symbol Vi V01 V02 H V02 L I01 IL01 I02 VI01 ...


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