AP7363 Datasheet, PDF (7/14 Pages) Diodes Incorporated – 1.5A, LOW QUIESCENT CURRENT, FAST TRANSIENT ULTRA-LOW DROPOUT LINEAR REGULATOR

AP7363
1.5A, LOW QUIESCENT CURRENT, FAST TRANSIENT
ULTRA-LOW DROPOUT LINEAR REGULATOR
Load Transient Response
V_IN=3.3V
C_OUT=10μF CER
V_OUT=1.8V (50mV/div)
I_LOAD=100mA to 1.5A (1A/div)
Time (40μs/div)
PSRR
90
80
70
60
50
40
V_IN=3.3V
30 _VOUT=1.8V
20 ^IOUT=1A
C_IN=1μF CER
10 _{COUT=1μF CER}
0
0.1
1
10
100
FREQUENCY(kHz)
1000
Application Note
Input Capacitor
A minimum 2.2μF ceramic capacitor is recommended
between IN and GND pins to decouple input power
supply glitch and noise. The amount of the capacitance
may be increased without limit. Larger input capacitor like
10μF will provide better load transient response. This
input capacitor must be located as close as possible to
the device to assure input stability and reduce noise. For
PCB layout, a wide copper trace is required for both IN
and GND pins. A lower ESR capacitor type allows the
use of less capacitance, while higher ESR type requires
more capacitance.
Output Capacitor
The output capacitor is required to stabilize and help the
transient response of the LDO. The AP7362 is stable with
any type of capacitor, with no limitations on minimum or
maximum ESR. The device is designed to have excellent
transient response for most applications with a small
amount of output capacitance. The device is also stable
with multiple capacitors in parallel, which can be of any
type of value. Additional capacitance helps to reduce
undershoot and overshoot during transient loads. This
capacitor should be placed as close as possible to OUT
and GND pins for optimum performance.
Adjustable Operation
The AP7362 provides output voltage from 0.6V to 5.0V
through external resistor divider as shown below.
The output voltage is calculated by:
VOUT
=
VREF _{⎜⎜⎝⎛}1+
R1
R2
⎟⎞
⎟⎠
Where V_REF=0.6V (the internal reference voltage)
Rearranging the equation will give the following that is
used for adjusting the output to a particular voltage:
R1
=
R2
⎜⎛
⎜⎝
VOUT
VREF
− 1_{⎟⎟⎠⎞}
To maintain the stability of the internal reference voltage,
R₂ need to be kept smaller than 10kΩ.
AP7363
Document number: DS35059 Rev. 2 - 2
7 of 14
www.diodes.com
July 2011
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