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PDF L4901 Data sheet ( Hoja de datos )

Número de pieza L4901
Descripción DUAL 5V REGULATOR WITH RESET
Fabricantes STMicroelectronics 
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® L4901A
DUAL 5V REGULATOR WITH RESET
. OUTPUT CURRENTS : I01 = 400mA
I0 2 = 400mA
. 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
. 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 OVER-
LOAD PROTECTION
HEPTAWATT (Vertical)
(Plastic Package)
ORDERING NUMBER : L4901A
DESCRIPTION
The L4901A is a monolithic low drop dual 5V
regulator designed mainly for supplying microproc-
essor systems.
Reset and data save functions during switch on/off
can be realized.
PIN CONNECTION
June 2000
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L4901 pdf
L4901A
tion.
This output may thereforebe usedto supply circuits
continuously, such as volatile RAMs, allowing the
use of a back-up battery. The V01 regulator also
features low consumption (0.6 mA typ.) to minimize
battery drain in applicationswhere the V1 regulator
is permanently connected to a battery supply.
The V02 output can supply other non essential 5 V
circuits which may be powered down when the
system is inactive, or that must be powered down
to prevent uncorrect operation for supply voltages
below the minimum value.
The reset output can be usedas a ”POWERDOWN
Figure 2
INTERRUPT”, permitting RAM access only in cor-
rect powerconditions,or as a ”BACK-UPENABLE”
to transfer data into in a NV SHADOW MEMORY
when the supply is interrupted.
APPLICATIONS SUGGESTIONS
Figure 2 shows an application circuit for a µP
system typically used in trip computers or in car
radios with programmable tuning.
Reg. 1 is permanently connected to a battery and
supplies a CMOS time-of-day clock and a CMOS
microcomputer chip with volatile memory.
Reg. 2 may be switched OFF when the system is
Figure 3 : P.C. Board Component Layout of Figure 2.
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