ncv8606 ON Semiconductor, ncv8606 Datasheet - Page 10

• Manufacturer Part Number: ncv8606
• Description: Ncv8605, Ncv8606 500 Ma, Low Ignd, Cmos Ldo Regulator With/without Enable And With Enhanced Esd Protection
• Manufacturer: ON Semiconductor

with internal thermal shutdown and internal current limit.
Typical application circuits are shown in Figures 1 to 4.
Input Decoupling (C
and should be connected close to the NCV8605/NCV8606
package. Higher capacitance and lower ESR will improve
the overall line transient response.
Output Decoupling (C
not require a minimum Equivalent Series Resistance (ESR)
for the output capacitor. The minimum output decoupling
value is 1.0 mF and can be augmented to fulfill stringent load
transient requirements. The regulator works with ceramic
chip capacitors as well as tantalum devices. Larger values
improve noise rejection and load regulation transient
response. Typical characteristics were measured with
Murata ceramic capacitors. GRM219R71E105K (1 mF,
25 V, X7R, 0805) and GRM21BR71A106K (10 mF, 10 V,
X7R, 0805).
No−Load Regulation Considerations
operate properly under conditions where the only load
current is through the resistor divider that sets the output
voltage.
NCV8605/NCV8606 is configured to provide a 1.250 V
output, there is no resistor divider. If the part is enabled
under no−load conditions, leakage current through the pass
transistor at junction temperatures above 85°C can approach
several microamps, especially as junction temperature
approaches 150°C. If this leakage current is not directed into
a load, the output voltage will rise up to a level
approximately 20 mV above nominal.
circuit to improve transient response during a load current
step release. When output voltage exceeds the nominal by
approximately 20 mV, this circuit becomes active and
clamps the output from further voltage increase. Tying the
ENABLE pin to V
part is active whenever the supply voltage is present, thus
guaranteeing that the clamp circuit is active whenever
leakage current is present.
overshoot clamp circuit becomes inactive and the pass
transistor leakage will charge any capacitance on V
load is present, the output can charge up to within a few
millivolts of V
some impedance to V
inherently clamped at a safe level. A minimum load of
10 mA is recommended.
there is no limitation for minimum load current.
The NCV8605/NCV8606 regulator is self*protected
A ceramic or tantalum 1.0 mF capacitor is recommended
The NCV8605/NCV8606 is a stable component and does
The NCV8605/NCV8606 adjustable regulator will
The NCV8605/ NCV8606 contains an overshoot clamp
When the NCV8606 adjustable regulator is disabled, the
Unlike LP8345, for NCV8605/606 fixed voltage versions
However,
in
. In most applications, the load will present
in
out
(NCV8606 only) will ensure that the
in
)
out
such that the output voltage will be
in
)
the
case
APPLICATIONS INFORMATION
where
out
http://onsemi.com
. If no
the
10
Noise Decoupling
needs no external noise reduction capacitor. Unlike other
low noise regulators which require an external capacitor and
have slow startup times, the NCV8605/NCV8606 operates
without a noise reduction capacitor, has a typical 8 ms
turn−on time and achieves a 50 mV
between 10 Hz and 100 kHz.
Enable Operation (NCV8606 Only)
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
4) to 4 times (Figure 3) 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 R
current and to minimize noise contribution to the output
voltage. Use Equation 2 to find the required value for R
Thermal
become 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 NCV8605/NCV8606 has good
thermal conductivity through the PCB, the junction
temperature will be relatively low with high power
applications.
NCV8605/NCV8606 can handle is given by:
then the NCV8605/NCV8606 soldered on 645 mm
copper area, FR4 can dissipate up to 1.3 W when the ambient
P
D(MAX)
The NCV8605/NCV8606 is a low noise regulator and
The enable pin will turn the regulator on or off. The
The output voltage can be adjusted from 1 times (Figure
Input bias current I
As power in the NCV8605/NCV8606 increases, it might
Since T
+
J
1
is not recommended to exceed 125°C (T
V
T
arbitrarily to minimize errors due to the bias
out
J(MAX)
in
R
+ 1.250 1 )
.
QJA
The
* T
R
ADJ
A
2
maximum
^
is typically less than 150 nA.
V
1.25
R
R
out
1
2
R
* 1
1
) I
rms
ADJ
overall noise level
dissipation
R
1
J(MAX)
(eq. 1)
(eq. 2)
(eq. 3)
2
, 1 oz
2
the
.
),