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CD00257532 데이터시트(PDF) 11 Page - STMicroelectronics

부품명 CD00257532
상세설명  Multifunction very low drop voltage regulator
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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CD00257532 데이터시트(HTML) 11 Page - STMicroelectronics

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L4949ED-E, L4949EP-E
Application information
Doc ID 16823 Rev 1
11/19
present functions are required. The modular approach of this device allows to get easily also
other features and functions when required.
3.3
Voltage regulator
The voltage regulator uses an Isolated Collector Vertical PNP transistor as a regulating
element.
Figure 4.
Foldback characteristic of VO
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 voltage is regulated up to the transient input supply voltage of 40V. With this
feature no functional interruption due to overvoltage pulses is generated. The typical curve
showing the standby output voltage as a function of the input supply voltage is shown in
Figure 5. The current consumption of the device (quiescent current) is less than 300 µA.
To reduce the quiescent current peak in the undervoltage region and to improve the
transient response in this region, the dropout voltage is controlled, the quiescent current as
a function of the supply input voltage is shown in Figure 6.


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