XRP6272ITC5TR-F Datasheet, PDF (8/13 Pages) Exar Corporation – 2A 5V-Adjustable Low Dropout Voltage Regulator

XRP6272
2A 5V-Adjustable Low Dropout Voltage Regulator
Fig. 22: PSRR Curve
APPLICATION INFORMATION
The XRP6272 is a low-dropout voltage
regulator with low quiescent current, low noise
and high PSRR. It can support load current up
to 2A. It incorporates current-limit and
thermal protection features.
TYPICAL APPLICATION SCHEMATIC
an output ceramic capacitor of at least 4.7µF
or 10µF (for V_OUT ≤ 1.8V) is recommended. An
input capacitor of 4.7µF is recommended.
X5R or X7R ceramic capacitors are
recommended as they have the best
temperature and voltage characteristics.
NOISE BYPASS CAPACITOR
A 22nF bypass capacitor at BP pin can reduce
output voltage noise. This pin can be left
floating if it is unnecessary.
THEORY OF OPERATION
SHUTDOWN
PROGRAMMING THE OUTPUT VOLTAGE
XRP6272’s internal feedback resistors set the
output voltage V_OUT to 5V when the ADJ pin is
connected to GND. Alternatively; the output
voltage is adjustable via the external feedback
resistor network R1 and R2 by calculating the
following formula:
R1
1 _R2
where, V_REF is the reference voltage set
internally at 0.7V nominal.
INPUT & OUTPUT CAPACITORS
XRP6272 is optimized for use with ceramic
capacitors. To ensure stability of the device,
By connecting EN pin to GND, the XRP6272
can be shutdown to reduce the supply current
to 0.01μA (typ.). In this mode, the output
voltage of XRP6272 is equal to 0V.
CURRENT LIMIT
The XRP6272 includes current limit protection
feature, which monitors and controls the
maximum output current. If the output is
overloaded or shorted to ground, this can
protect the device from being damaged.
THERMAL PROTECTION
The XRP6272 includes a thermal protection
feature that protects the IC by turning off the
pass transistor when the maximum junction
temperature T_J exceeds 150ºC.
© 2011 Exar Corporation
8/13
Rev. 1.2.0