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L4902A

STMicroelectronics
Part Number L4902A
Manufacturer STMicroelectronics
Description DUAL 5V REGULATOR WITH RESET AND DISABLE
Published Mar 22, 2005
Detailed Description ® L4902A DUAL 5V REGULATOR WITH RESET AND DISABLE . . . . . . . . . . . . . DOUBLE BATTERY OPERATING OUTPUT CURRENTS ...
Datasheet PDF File L4902A PDF File

L4902A
L4902A

Overview
® L4902A DUAL 5V REGULATOR WITH RESET AND DISABLE .
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DOUBLE BATTERY OPERATING OUTPUT CURRENTS : I01 = 300 mA I02 = 300 mA 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 RESET OUTPUT NORMALLY HIGH INPUT OVERVOLTAGE PROTECTION UP TO 60V OUTPUT TRANSISTORS SOA PROTECTION SHORT CIRCUIT AND THERMAL OVERLOAD PROTECTION HEPTAWATT (Vertical) ORDERING NUMBER : L4902A DESCRIPTION The L4902A is a monolithic low drop dual 5V regulator designed mainly for supplying microprocessor systems.
Reset and data save functions and remote switch on/off control can be realized.
PIN CONNECTION June 2000 1/9 L4902A PIN FUNCTIONS N° 1 2 3 4 5 Name Input 1 Timing Capacitor Disable Input GND Reset Output Regulators Common Input If Reg.
2 is switched-ON the delay capacitor is charged with a 5µA constant current.
When Reg.
2 is switched-OFF the delay capacitor is discharged.
A high level (> VDT) disable output Reg.
2.
Common Ground When pin 2 reaches 5V the reset output is switched high.
5V ) ; tRD (ms) = Ct (nF) Therefore tRD = Ct ( 10µA 5V – 300mA Regulator Output.
Enabled if Vo 1 > VRT.
DISABLE INPUT < VDT and VIN > VIT.
If Reg.
2 is switched-OFF the C02 capacitor is discharged.
5V – 300mA.
Low leakage (in switch-OFF condition) output Function 6 7 Output 2 Output 1 BLOCK DIAGRAM SCHEMATIC DIAGRAM 2/9 L4902A ABSOLUTE MAXIMUM RATINGS Symbol V IN Io Tstg, Tj Parameter DC Input Voltage Transient Input Overvoltage (t = 40ms) Output Current Storage and Junction Temperature Value 28 60 Internally Limited – 40 to 150 °C Unit V V THERMAL DATA Symbol Rth j-case Parameter Thermal Resistance Junction-case Max Value 4 Unit °C/W ELECTRICAL CHARACTERISTICS (VIN = 14.
4V, Tamb = 25oC unless otherwise speci...


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