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PDF L4902A Data sheet ( Hoja de datos )
| Número de pieza | L4902A | |
| Descripción | DUAL 5V REGULATOR WITH RESET AND DISABLE | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de L4902A (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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® L4902A
DUAL 5V REGULATOR WITH RESET AND DISABLE
. 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 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
. RESET OUTPUT NORMALLY HIGH
. INPUT OVERVOLTAGE PROTECTION UP TO
60V
. OUTPUT TRANSISTORS SOA PROTECTION
. SHORT CIRCUIT AND THERMAL OVER-
LOAD PROTECTION
HEPTAWATT (Vertical)
ORDERING NUMBER : L4902A
DESCRIPTION
The L4902A is a monolithic low drop dual 5V
regulator designed mainly for supplying microproc-
essor systems.
Reset and data save functions and remote switch
on/off control can be realized.
PIN CONNECTION
June 2000
1/9
1 page  
L4902A
This output may thereforebe usedto supply circuits
continuously, such as volatile RAMs, allowing the
use of a back-up battery.
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
INTERRUPT”, permitting RAM access only in cor-
rect power conditions, or as a ”BACK-UP ENABLE”
to transfer data into in a NV SHADOW MEMORY
Figure 2
when the supply is interrupted.
The disable function can be used for remote on/off
control of circuits connected to the V02 output.
APPLICATION SUGGESTIONS
Figure 2 illustrate how the L4902A’s disable input
may be used in a CMOS µComputer application.
TheV01 regulator(low consumption)supply perma-
nently a CMOS time of day clock and a CMOS
µcomputer chip with volatile memory. V02 output,
supplying non-essential circuits, is turned OFF un-
der control of a µP unit.
Figure 3 : P.C. Board Component Layout of Figure 2
5/9
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| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet L4902A.PDF ] | |
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