6 voltage regulator, At different ambient temperatures due to r – Rainbow Electronics ATA6630 User Manual
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9117C–AUTO–10/09
ATA6628/ATA6630 [Preliminary]
5.6
Voltage Regulator
The voltage regulator needs an external capacitor for compensation and for smoothing the dis-
turbances from the microcontroller. It is recommended to use an electrolythic capacitor with
C > 1.8 µF and a ceramic capacitor with C = 100 nF. The values of these capacitors can be var-
ied by the customer, depending on the application.
The main power dissipation of the IC is created from the VCC output current I
VCC
, which is
needed for the application. In
the safe operating area of the
ATA6628/ATA6630 is shown.
Figure 5-1.
VCC Voltage Regulator: Ramp-up and Undervoltage Detection
Figure 5-2.
Power Dissipation: Safe Operating Area versus VCC Output Current and Supply
Voltage V
S
at Different Ambient Temperatures Due to R
thja
= 35 K/W
For microcontroller programming, it may be necessary to supply the VCC output via an external
power supply while the V
S
Pin of the system basis chip is disconnected. This behavior is no
problem for the system basis chip.
NRE
S
5V/
3
.
3
V
t
t
t
V
S
5V/
3
.
3
V
V
th
u
n
T
re
s
_f
T
Re
s
et
T
VCC
5.5V/
3
.
8
V
12V
VCC
0
10
2 0
3
0
4 0
50
6 0
3
5
7
9
11
1
3
15
17
19
V
S
/V
I
VCC
/mA
T
a
m
b
= 125°C
T
a
m
b
= 105°C