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L4995J Datasheet(PDF) 6 Page - STMicroelectronics

Part # L4995J
Description  5V, 500mA low drop voltage regulator
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4995J Datasheet(HTML) 6 Page - STMicroelectronics

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Block diagrams and pins descriptions
L4995
6/35
Doc ID 13103 Rev 13
Figure 3.
Block diagram of L4995R
Table 2.
Pins descriptions
Pin
name
PowerSSO-12
pin #
PowerSSO-24
pin #
Function
En
1
13, 14, 15
Enable input (L4995 and L4996A only, otherwise not
connected).
If high regulator, watchdog and reset are operating. If
low regulator, watchdog and reset are shutdown.
Connect to Vs if not used.
NC
2, 4, 8
3, 5, 6, 9, 11
Not connected.
GND
3
16, 17, 18
Ground reference.
-TAB
TAB, 1, 12
Substrate of the chip: connect the pins or the TAB to
GND.
Res
5
19, 20, 21
Reset output.
It is pulled down when output voltage goes below Vo_th
or frequency at Wi is too low. Leave floating if not used.
Vcr
6
22, 23, 24
Reset timing adjust.
A capacitor between Vcr pin and GND. Sets the reset
delay time (trd). Leave floating if Reset is not used.
Vcw
72
Watchdog timer adjust (L4995 only, otherwise not
connected).
A capacitor between Vcw pin and GND. Sets the time
response of the watchdog monitor.


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