ncp699 ON Semiconductor, ncp699 Datasheet - Page 7

• Manufacturer Part Number: ncp699
• Description: 150 Ma Cmos Low Iq Ldo With Enable
• Manufacturer: ON Semiconductor

shown in Figure 1, front page.
Input Decoupling (C
recommended and should be connected close to the NCP699
package. Higher values and lower ESR will improve the
overall line transient response.
TDK capacitor: C2012X5R1C105K, or C1608X5R1A105K
Output Decoupling (C
specific Equivalent Series Resistance (ESR) or a minimum
output current. Capacitors exhibiting ESRs ranging from a
few mW up to 5.0 W can thus safely be used. The minimum
decoupling value is 1.0 mF and can be augmented to fulfill
stringent load transient requirements. The regulator accepts
ceramic chip capacitors as well as tantalum capacitors.
Larger values improve noise rejection and load regulation
transient response.
TDK capacitor: C2012X5R1C105K, C1608X5R1A105K,
or C3216X7R1C105K
Enable Operation
and turn off the regulator when pulled low. These limits of
threshold are covered in the electrical specification section
of this data sheet. If the enable is not used then the pin should
be connected to V
Hints
When the impedance of these lines is high, there is a chance
to pick up noise or cause the regulator to malfunction.
A typical application circuit for the NCP699 series is
A 1.0 mF capacitor either ceramic or tantalum is
The NCP699 is a stable regulator and does not require any
The enable pin will turn on the regulator when pulled high
Please be sure the Vin and Gnd lines are sufficiently wide.
in
.
in
)
out
)
APPLICATIONS INFORMATION
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NCP699
7
as close as possible to the circuit, and make leads as short as
possible.
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 also the ambient
temperature effect the rate of temperature rise for the part.
This is stating that when the NCP699 has good thermal
conductivity through the PCB, the junction temperature will
be relatively low with high power dissipation applications.
given by:
maximum 125°C, then the NCP699 can dissipate up to
400 mW @ 25°C.
from the following equation:
current from the data sheet is 40 mA. For an NCP699 (3.0 V),
the maximum input voltage will then be 5.65 V.
Set external components, especially the output capacitor,
As power across the NCP699 increases, it might become
The maximum dissipation the package can handle is
If junction temperature is not allowed above the
The power dissipated by the NCP699 can be calculated
or
If an 150 mA output current is needed then the ground
P tot + [ V in * I gnd (@I out ) ] ) [ V in * V out ] * I out
V inMAX +
PD +
T J(max) *T A
I gnd ( @I out ) ) I out
P tot ) V out * I out
R qJA