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L4949EDTR-E Datasheet(PDF) 6 Page - STMicroelectronics

Part # L4949EDTR-E
Description  Multifunction very low drop voltage regulator
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4949EDTR-E Datasheet(HTML) 6 Page - STMicroelectronics

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Block diagram and pin description
L4949ED-E, L4949EP-E
6/19
Doc ID 16823 Rev 1
Table 2.
Pin definitions and functions
Pin N°
Symbol
Function
SO-8
SO-20
119
VS
Input supply voltage. Block to GND via an external
capacitor (see Figure 3).
220
SI
Sense input pin to supervise input voltage. Connect via an
external voltage divider connected to VS and to GND.
31
VZ
Preregulator output voltage. For details, see Section 3.4:
Preregulator.
42
CT
Reset pulse delay adjustment. Connecting this pin via a
capacitor to GND
5
4, 5, 6, 7, 14,
15, 16, 17
GND
Ground reference
610
RES
Reset output. It is pulled down when the output voltage
goes below VRT.
711
SO
Sense output. This open collector pin must be connected to
VOUT via an external resistor. It is pulled down whenever
the SI voltage becomes lower than an internal voltage.
812
VOUT
Output voltage. Block to GND via an external capacitor (see
Figure 3)
-
3, 8, 9, 13, 18
NC
Not connected pins


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