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L4901 Datasheet(PDF) 4 Page - STMicroelectronics

Part # L4901
Description  DUAL 5V REGULATOR WITH RESET
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4901 Datasheet(HTML) 4 Page - STMicroelectronics

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TEST CIRCUIT
APPLICATION INFORMATION
In power supplies for
µP systems it is necessaryto
provide power continuously to avoid loss of infor-
mation in memories and in time of day clocks, or to
save datawhen the primary supply is removed.The
L4901A makes it very easy to supply such equip-
ments ; it provides two voltage regulators (both 5 V
high precision) with separate inputs plus a reset
output for the data save function.
CIRCUIT OPERATION (see Figure 1)
After switch on Reg. 1 saturates until V01 rises to
the nominal value.
When the input 2 reaches VIT and the output 1 is
higher than VRT the output 2 (V02) switches on and
the reset output (VR) also goes high after a pro-
grammable time TRD (timing capacitor).
V02 and VR are switched togetherat low level when
one of the following conditions occurs :
- an input overvoltage
- an overload on the output 1 (V01 <VRT);
- a switch off (VIN <VIT -VITH);
and they start again as before when the condition
is removed.
An overload on output 2 does not switch Reg. 2,
and does not influence Reg. 1.
The V01 output features :
- 5 V internal reference without voltage divider
between the output and the error comparator ;
- very low drop series regulator element utilizing
current mirrors ;
permit high output impedance and then very low
leakage current error even in power down condi-
Figure 1
L4901A
4/10


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