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PDF L4903 Data sheet ( Hoja de datos )

Número de pieza L4903
Descripción DUAL 5V REGULATOR WITH RESET AND DISABLE FUNCTIONS
Fabricantes STMicroelectronics 
Logotipo STMicroelectronics Logotipo



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L4903
DUAL 5V REGULATOR
WITH RESET AND DISABLE FUNCTIONS
. 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 PRO-
GRAMMABLE TIMING
. RESET OUTPUT LEVEL RELATED TO OUT-
PUT 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 OVER-
LOAD PROTECTION
PRELIMINARY DATA
Minidip
ORDERING NUMBERS : L4903
DESCRIPTION
The L4903 is a monolithic low drop dual 5 V regu-
lator designed mainly for supplying microprocessor
systems.
Reset, data save functions and remote switch
on/off control can be realized.
PIN CONNECTION
July1993
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L4903 pdf
Figure 2
L4903
APPLICATION SUGGESTION
Figure 3 illustrates how the L4903’s disable input
may be used in a CMOS µComputer application.
The V01 regulator (low consumption) supply perma-
nently a CMOS time of day clock and a CMOS
computer chip with volatile memory. V02 output,
Figure 3
supplying non-essential circuits, is turned OFF un-
der control of a µP unit.
Configurations of this type are used in products
where the OFF switch is part of a keyboard
scanned by a micro which operates continuously
even in the OFF state.
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