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L4989MD013TR

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
List of figures L4989D, L4989MD
4/19 Doc ID 022376 Rev. 2
List of figures
Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. Pins configuration (top view). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3. Behavior of output current versus regulated voltage V
o
. . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 4. Reset timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 5. Watchdog timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 6. SO-8 package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 7. SO-20 package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 8. SO-8 tube shipment (no suffix) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 9. SO-8 tape and reel shipment (suffix “TR”) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 10. SO-20 tube shipment (no suffix) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 11. SO-20 tape and reel shipment (suffix “TR”) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
L4989D, L4989MD Block diagram and pin configuration
Doc ID 022376 Rev. 2 5/19
1 Block diagram and pin configuration
Figure 1. Block diagram
Table 2. Pins description
Pin name SO-8(D) S0-20(MD) Function
WE
n
11
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 V
o_th
or frequency at Wi is too low.
Vcr 4 10
Reset timing adjust.
A capacitor between Vcr pin and gnd, sets the reset
delay time (t
rd
)
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.
Block diagram and pin configuration L4989D, L4989MD
6/19 Doc ID 022376 Rev. 2
Figure 2. Pins configuration (top view)
V
o
717
Voltage regulator output
Block to ground with a capacitor >100nF (needed for
regulator stability)
V
S
820
Supply voltage
Block to ground directly at IC pin with a capacitor
N.C.
2, 3, 8, 9, 12,
13, 18, 19
Not connected
Table 2. Pins description (continued)
Pin name SO-8(D) S0-20(MD) Function
WEn
GND
Res
Vcr
1
2
3
4
5
6
7
8
Vs
Vo
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.
Vo
GND
GND
Wi
N.C.
N.C.
Vcw
11
12
13
14
15
16
17
18
19
Vs
SO-8
SO-20
GAPGCFT00666
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L4989MD013TR

Mfr. #:
Buy L4989MD013TR
Manufacturer:
STMicroelectronics
Description:
LDO Voltage Regulators BODY SMARTPOWER
Lifecycle:
New from this manufacturer.
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