ncv8560 ON Semiconductor, ncv8560 Datasheet - Page 12

• Manufacturer Part Number: ncv8560
• Description: High Performance Low?power, Ldo Regulator With Enable
• Manufacturer: ON Semiconductor

Noise Decoupling
external noise reduction capacitor. Unlike other low noise
regulators which require an external capacitor and have slow
startup times, the NCV8560 operates without a noise
reduction capacitor, has a typical 15 ms start up delay and
achieves a 50 mV
100 kHz.
Enable Operation
threshold limits are covered in the electrical characteristics
table in this data sheet. The turn-on/turn-off transient
voltage being supplied to the enable pin should exceed a
slew rate of 10 mV/ms to ensure correct operation. If the
enable function is not to be used then the pin should be
connected to V
Output Voltage Adjust
(Figure 4) to 4 times (Figure 5) the typical 1.250 V
regulation voltage via the use of resistors between the output
and the ADJ input. The output voltage and resistors are
chosen using Equation 1 and Equation 2.
Choose R2 arbitrarily t minimize errors due to the bias
current and to minimize noise contribution to the output
voltage. Use Equation 2 to find the required value for R1.
Thermal
necessary to provide some thermal relief. The maximum
power dissipation supported by the device is dependent
upon board design and layout. Mounting pad configuration
on the PCB, the board material, and the ambient temperature
affect the rate of junction temperature rise for the part. When
the NCV8560 has good thermal conductivity through the
PCB, the junction temperature will be relatively low with
high power applications. The maximum dissipation the
NCV8560 can handle is given by:
The NCV8560 is a low noise regulator and needs no
The enable pin will turn the regulator on or off. The
The output voltage can be adjusted from 1 times
Input bias current I
As power in the NCV8560 increases, it might become
V
out
in
+ 1.250 1 )
.
P D(MAX) +
rms
R
2
+ R
overall noise level between 10 Hz and
ADJ
1
is typically less than 150 nA.
1 )
T J(MAX) * T A
R
R
1
2
V
1.25
out
R qJA
) I
1
* 1
ADJ
R
1
http://onsemi.com
(eq. 1)
(eq. 2)
(eq. 3)
NCV8560
12
then the NCV8560 in a DFN6 package can dissipate up to
600 mW when the ambient temperature (T
PCB area is 150mm
from the following equations:
I
table or extracted from Figure 20 and Figure 22. I
approximately 108 mA when I
voltage of 1.250 V, the maximum input voltage will then be
3.9 V, good for a 1 Cell Li-ion battery.
Hints
wide as possible. When the impedance of these traces is
high, there is a chance to pick up noise or cause the regulator
to malfunction. Place external components, especially the
output capacitor, as close as possible to the NCV8560, and
make traces as short as possible.
GND
Since T
The power dissipated by the NCV8560 can be calculated
or
If a 150 mA output current is needed, the quiescent current
V
350
300
250
200
150
100
50
in
0
is taken from the data sheet electrical characteristics
and GND printed circuit board traces should be as
0
P
J
D
is not recommended to exceed 125°C (T
[ V
Figure 33. R
100
V
in(MAX)
in
I
GND
PCB COPPER AREA (mm
200
2
[
and larger, see Figure 33.
DFN6 3x3.3 (1 oz)
@ I
TSOP-5 (1 oz)
P
thJA
D(MAX)
out
300
I
vs. PCB Copper Area
) I
out
out
) V
) I
out
= 150 mA. For an output
400
GND
V
out
in
* V
500
I
out
A
out
2
)
) is 25°C, and
600
J(MAX)
(eq. 4)
(eq. 5)
GND
700
is
),