M5451Q STMicroelectronics, M5451Q Datasheet - Page 7
![IC LED DISPLAY DRIVER 44-PLCC](/photos/39/47/394726/plcc-44_sml.jpg)
M5451Q
Manufacturer Part Number
M5451Q
Description
IC LED DISPLAY DRIVER 44-PLCC
Manufacturer
STMicroelectronics
Datasheet
1.M5450B7.pdf
(12 pages)
Specifications of M5451Q
Display Type
LED
Configuration
Alphanumeric or Dot Matrix
Interface
Serial
Digits Or Characters
4 or 5 Digits
Current - Supply
7mA
Voltage - Supply
4.75 V ~ 13.2 V
Operating Temperature
-25°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
44-PLCC
Number Of Digits
5
Number Of Segments
35
Low Level Output Current
25 mA
Operating Supply Voltage
4.75 V to 13.2 V
Maximum Supply Current
7 mA
Maximum Power Dissipation
1 W
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 25 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
M5451Q
Manufacturer:
ST
Quantity:
20 000
POWER DISSIPATION OF THE IC
The power dissipation of the IC can be limited us-
ing different configurations.
Figure 11- In the application R must be chosen
taking into account the worst operating conditions.
Figure 11.
R is determined by the maximum number of seg-
ments activated
The worst case condition for the device is when
roughly half of the maximum number of segments
are activated.
It must be checked that the total power dissipation
does not exceed the absolute maximum ratings of
the device.
In critical cases more resistors can be used in con-
junction with groups of segments.
In this case the current variation in the single resis-
tor is reduced and P
Figure 12 - In this configuration the drop on the se-
rial connected diodes is quite stable if the diodes
are properly chosen.
V OUT
R
V D
=
R
V
----------------------------------------------------------------
+V C
C
I D
–
tot
V
DMAX
N
limited.
MAX
L
–
D
V
OMIN
The total power dissipation of the IC depends, in a
first approximation, only on the number of seg-
ments activated.
Figure 12.
Figure 13 - In this configuration V
stant. The total power dissipation of the IC de-
pends only on the number of segments activated.
Figure 13.
+V
V
C
+V
OUT
C
+V
D
M5450, M5451
OUT
+ V
D
is con-
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