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PDF L4904A Data sheet ( Hoja de datos )
| Número de pieza | L4904A | |
| Descripción | DUAL 5V REGULATOR WITH RESET | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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® L4904A
DUAL 5V REGULATOR WITH RESET
. 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
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 NORMALLY HIGH
. OUTPUT TRANSISTORS SOA PROTECTION
. SHORT CIRCUIT AND THERMAL OVER-
LOAD PROTECTION
Minidip
ORDERING NUMBER : L4904A
DESCRIPTION
The L4904A 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
1/9
1 page  
Figure 2
L4904A
APPLICATION SUGGESTIONS
Figure 3 shows an application circuit for a µP
system.
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
inactive.
Figure 4 shows the L4904A with a back up battery
on the V01 output to maintain a CMOS time-of-day
Figure 3
clock and a stand by type C-MOS µP. The reset
output makes sure that the RAM is forced into the
low consumption stand by state, so the access to
memory is inhibit and the back up battery voltage
cannot drop so low that memory contents are cor-
rupted.
In this casethe main on-off switch disconnects both
regulators from the supply battery.
Application Circuits of a Microprocessor system
(Figure 3) or with data save battery (Figure 4). The
reset output provide delayed rising front at the
5/9
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet L4904A.PDF ] | |
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