ncv8560 ON Semiconductor, ncv8560 Datasheet - Page 11

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

Load Regulation
current at a constant temperature.
Dropout Voltage
no longer maintains regulation against further reductions in
input voltage. Measured when the output drops 2% below its
nominal. The junction temperature, load current, and
minimum input supply requirements affect the dropout level.
Output Noise Voltage
specified frequency range. Input voltage and output load
current are kept constant during the measurement. Results
are expressed in mV
Ground Current
the ground pin when the regulator operates with a load on its
output. This consists of internal IC operation, bias, etc. It is
actually the difference between the input current (measured
through the LDO input pin) and the output load current. If
the regulator has an input pin that reduces its internal bias
and shuts off the output (enable/disable function), this term
is called the disable current (I
internal thermal shutdown and internal current limit. Typical
application circuits are shown in Figures 4 and 5.
Input Decoupling (C
and should be connected close to the NCV8560 package.
Higher capacitance and lower ESR will improve the overall
line transient response.
Output Decoupling (C
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. Figure 30 shows the stability region for a range of
operating conditions and ESR values.
No-Load Regulation Considerations
under conditions where the only load current is through the
resistor divider that sets the output voltage. However, in the
case where the NCV8560 is configured to provide a 1.250
The change in output voltage for a change in output load
The input/output differential at which the regulator output
This is the integrated value of the output noise over a
Ground Current (I
The NCV8560 series regulator is self-protected with
A ceramic or tantalum 1.0 mF capacitor is recommended
The NCV8560 is a stable component and does not require
The NCV8560 adjustable regulator will operate properly
rms
GND
in
)
out
or nV/√Hz.
) is the current that flows through
)
DIS
).
APPLICATIONS INFORMATION
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DEFINITIONS
NCV8560
11
Line Regulation
The measurement is made under conditions of low
dissipation or by using pulse techniques such that the
average junction temperature is not significantly affected.
Line Transient Response
response when the input voltage is excited with a given
slope.
Load Transient Response
response when the output current is excited with a given
slope between no-load and full-load conditions.
Thermal Protection
the integrated circuit in the event that the maximum junction
temperature is exceeded. When activated at typically 175°C,
the regulator turns off. This feature is provided to prevent
failures from accidental overheating.
Maximum Package Power Dissipation
temperature reaches its maximum operating value.
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.
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
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.
The change in output voltage for a change in input voltage.
Typical output voltage overshoot and undershoot
Typical output voltage overshoot and undershoot
Internal thermal shutdown circuitry is provided to protect
The power dissipation level at which the junction
The NCV8560 contains an overshoot clamp circuit to
When the NCV8560 adjustable regulator is disabled, the
in
. In most applications, the load will present
in
out
will ensure that the part is active
such that the output voltage will be
out
. If no