L4936E 데이터 시트보기 (PDF) - STMicroelectronics
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L4936E Datasheet PDF : 11 Pages
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APPLICATION CIRCUIT
L4936E
(Note 8)
100K
15V
for example
BZX97C15
VS1
CS
VS2
EN
1.23V
REG1
REG2
PR
RESET
SI
1.23V
SENSE
1.23V
REFERENCE
1.23V
1.4V
OUT1
CO1
OUT2
ADJ
CO2
CT (Note 7)
CT
RES
SO
VOUT1
RSO
GND
D94AT079A
FUNCTIONAL DESCRIPTION
The L4936E is a monolithic integrated dual volt-
age regulator, based on the STM modulator volt-
age regulator approach. Several outstanding fea-
tures and auxiliary functions are implemented to
meet the requirements of supplying microproces-
sor systems in automotive applications. Neverthe-
less, it is suitable also in other applications where
two stabilized voltages are required. The modular
approach of this device allows to get easly also
other features and functions when required.
Standby Regulator
The standby regulator uses an Isolated collector
Vertical PNP transistor as a regulating element.
With this structure very low dropout voltage at
currents up to 100mA is obtained. The dropout
operation of the standby regulator is maintained
down to 3V input supply voltage. The output volt-
age is regulated up to the transient input supply
voltage of 40V. With this feature no functional in-
terruption due to overvoltage pulses is generated.
In the standby mode when the output 2 is dis-
abled, the current consumption of the device (qui-
escent current) is less than 90µA (14V supply
voltage).
To reduce the quiescent current peak in the un-
dervoltage region and to improve the transient re-
sponse in this region, the dropout voltage is con-
trolled. A second regulation path will keep the
output voltage without load below 5.5V even at
high temperatures.
Output 2 Voltage
The output 2 regulator uses the same output
structure as the standby regulator but rated for
the output current of 400mA. The output voltage
is internally fixed to 5V if ADJ is connected to
VOUT2.
-
+
1.23V
R1i
RADJ
R2i
total 100K
typical
OUT2
ADJ
R1E
R2E
D94AT080
5/11
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