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L4979D 데이터시트(PDF) 5 Page - STMicroelectronics

부품명 L4979D
상세설명  Low drop voltage regulator
PDF  22 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4979D 데이터시트(HTML) 5 Page - STMicroelectronics

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L4979D, L4979MD
Block diagram and pin descriptions
Doc ID 10262 Rev 9
5/22
1
Block diagram and pin descriptions
Figure 1.
Block diagram
Table 2.
Pin function
SO8
pin number
SO20
pin number
Pin name
Function
1
1
En
Enable input If high, regulator, watchdog and reset are
operating. If low, regulator, watchdog and reset are shut
down.
2
4
gnd
Ground reference
5,6,15,16
gnd
Ground These pins are to be connected to a heat
spreader electrically grounded
3
7
Res
Reset output. It is pulled down when output voltage
drops below Vo_th or frequency at Wi is too low.
4
10
Vcr
Reset timing adjust A capacitor between Vcr pin and
gnd sets the reset delay time (trd)
5
11
Vcw
Watchdog timer adjust A capacitor between Vcw pin and
gnd sets the time response of the watchdog monitor.
6
14
Wi
Watchdog input. If the frequency at this input pin is too
low, the Reset output is activated.
7
17
Vo
Voltage regulator output Output capacitor >100 nF is
needed for regulator stability



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