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NCP400 Datasheet(PDF) 11 Page - ON Semiconductor

Part No. NCP400
Description  150 mA CMOS Low Iq Low-Dropout Voltage Regulator with Voltage Detector Output
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP400 Datasheet(HTML) 11 Page - ON Semiconductor

 
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NCP400
http://onsemi.com
11
APPLICATION INFORMATION
Low Dropout Voltage Regulator
−Input Decoupling
A 1.0
mF capacitor either ceramic or tantalum is
recommended and should be connected close to the NCP400
package. Higher values and lower ESR will improve the
overall line transient response.
−Output Decoupling
The NCP400 is a stable Regulator and does not require
any specific Equivalent Series Resistance (ESR) or a
minimum output current. Capacitors exhibiting ESRs
ranging from a few m
W up to 10 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 devices. Larger values improve noise rejection and
load regulation transient response. Figure 25 shows the
stable area of the regulator with different output capacitor
ESR and output current.
Figure 25. Output Capacitor versus Output Current
IO, OUTPUT CURRENT (mA)
0.01
0.1
1
10
100
0
25
50
75
100
125
150
Cout = 1 mF TO 10 mF
TA = 25°C to 125°C
Vin = up to 5.5 V
UNSTABLE
UNSTABLE
STABLE
−Thermal Protection
Internal thermal shutdown circuit is provided to protect
the integrated circuit in the event that the maximum junction
temperature is exceeded. When the thermal protection
activated, higher than 150
°C, the regulator turns off. This
feature is provided to prevent failures from accidental
overheating.
−Hints
Please be sure the Vin and GND lines are sufficiently
wide. When the impedance of these lines is high, there is a
chance to pick up noise or cause the regulator to
malfunction. Set external components, especially the output
capacitor, as close as possible to the circuit, and make leads
a short as possible.
Voltage Detector
The voltage detector has built−in hysteresis to prevent
erratic reset operation. This device is specifically designed
for use as reset controllers in portable microprocessor based
systems, it can offer a cost−effective solution in numerous
applications where precise voltage monitoring and time
delay are required. Figures 26 through 27 shows various
application examples.


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