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L4993 Datasheet(PDF) 6 Page - STMicroelectronics

Part # L4993
Description  Low drop voltage regulator
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4993 Datasheet(HTML) 6 Page - STMicroelectronics

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Block diagram and pins description
L4993
6/30
Figure 2.
Pins configuration
Table 2.
Pins description
Pin
name
SO-8 (D)
SO-20 (MD)
Function
WEn
1
1
Watchdog Enable input
If high watchdog functionality is active
Gnd
2
4
Ground reference
Gnd
5, 6, 15, 16
Ground
Connected these pins to a heat spreader ground
Res
3
7
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
4
10
Reset timing adjust.
A capacitor between Vcr pin and gnd, sets the reset
delay time (trd)
Vcw
5
11
Watchdog timer adjust
A capacitor between Vcw pin and gnd, sets the time
response of the watchdog monitor.
Wi
6
14
Watchdog input.
If the frequency at this input pin is too low, the Reset
output is activated.
Connect to ground if not used
Vos
717
Voltage regulator output
Block to ground with a capacitor >100nF (needed for
regulator stability)
Vs
8
20
Supply voltage
Block to ground directly at IC pin with a capacitor
N.C.
2, 3, 8, 9, 12,
13, 18, 19
Not connected
WEn
GND
Res
Vcr
1
2
3
4
5
6
7
8
Vs
Vos
Wi
Vcw
WEn
N.C.
N.C.
GND
GND
GND
Res
N.C.
N.C.
Vcr
10
9
8
7
6
5
4
3
2
1
20
N.C.
N.C.
Vos
GND
GND
Wi
N.C.
N.C.
Vcw
11
12
13
14
15
16
17
18
19
Vs
SO-8
SO-20


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