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AP7173-FNG-13 Datasheet(PDF) 11 Page - Diodes Incorporated

Part # AP7173-FNG-13
Description  1.5A LOW DROPOUT LINEAR REGULATOR WITH PROGRAMMABLE SOFT-START
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Manufacturer  DIODES [Diodes Incorporated]
Direct Link  http://www.diodes.com
Logo DIODES - Diodes Incorporated

AP7173-FNG-13 Datasheet(HTML) 11 Page - Diodes Incorporated

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AP7173
1.5A LOW DROPOUT LINEAR REGULATOR WITH
PROGRAMMABLE SOFT-START
AP7173 Rev. 4
11 of 15
MARCH 2008
www.diodes.com
© Diodes Incorporated
Application Note
BIAS VOLTAGE VVCC
DROPOUT VOLTAGE
The AP7173 is a low VIN, low dropout regulator that uses an
NMOS pass FET. The VCC pin must be connected to a DC
bias supply VVCC for the internal control circuitry and the gate
drive of the pass FET to function properly and to obtain low
dropout. The VVCC needs to be equal to or higher than the VIN
and in the range of 2.7V-5.5V. Figure 27 illustrates the typical
application circuit for the AP7173.
EN
PG
VCC
IN
OUT
FB
SS
GND
AP7173
R1
R2
R3
C1
C2
C3
VOUT
VIN
+5V
CSS
Figure 27. Typical Application Circuit for AP7173
ADJUSTABLE OUTPUT VOLTAGE
With an external voltage divider, the AP7173 can provide
output voltage from 0.8V to 3.3V. R1 and R2 can be calculated
for any output voltage using the following equation, where
VREF=0.8 is the AP7173’s internal reference voltage. Refer to
Table 1 for resistor combinations for commonly used output
voltages. For maximum voltage accuracy, R2 should be
≤ 5kΩ.
VOUT = VREF x (1 + R1/R2)
INPUT VIN AND BIAS VVCC CAPACITORS
It is important to keep the IN and VCC pins clear of large
ripples, glitches and other noises by connecting capacitors to
the IN and VCC pins. The required capacitance on these pins
is strongly dependent on source and wiring impedance of the
supplies.
To provide good decoupling for the input power supply VIN, it is
recommended that a ceramic capacitor with capacitance of at
least 1
μF is connected between the IN and GND pins at a
location as close to them as possible. High quality, low ESR
capacitors should be used for better performance.
It is critical to provide good decoupling to the VCC pin for the
AP7173’s internal control circuitry to function properly. The
minimum recommended capacitance for the VVCC is 1μF when
the VVCC and VIN are separate supplies. If the VIN and VVCC are
connected to the same supply, the recommended minimum
capacitance for VVCC is 4.7μF. Again good quality, low ESR
capacitors should be used for optimum performance.
OUTPUT CAPACITOR
The output capacitor affects the stability and transient response
of the LDO. The AP7173 is designed to be stable for all types
of output capacitors
≥ 2.2μF, single or multiple in parallel. Using
high-quality, low ESR capacitors and placing them close to the
OUT and GND pins can improve perfomance.
The very low dropout makes the AP7173 well suited for
high-current, low VIN/low VOUT applications. To achieve the
specified low-dropout performance for such applications, the
VCC pin should be connected to a separate supply of at least
3.25V higher than VOUT. Figure 28 shows an application circuit
where VVCC is 5V and VOUT is 1.2V.
Vref
VCC
IN
FB
AP7173
OUT
R1
R2
C2
(1.2V)
IOUT
VVCC (5V)
+
_
(1.5A)
VOUT
VIN (1.5V)
Figure 28. Typical Application Circuit for AP7173
Using Separate VCC and IN Rails
For applications where low dropout is not required or a separate
VVCC supply is not available, the IN and VCC pins can be tied
together. In this situation, a voltage difference of at least 1.7V
between the VVCC and VOUT has to be maintained for the VVCC to
provide enough gate drive to the pass FET. Therefore, the VOUT
needs to be 1.7V or more below VIN, as shown in Figure 29.
Vref
VCC
IN
FB
AP7173
OUT
R1
R2
C2
VOUT (1.2V)
VIN (3.0V)
+
_
IOUT (1.5A)
Figure 29. Typical Application Circuit for AP7173
Without an Auxiliary VCC Rail
PROGRAMMABLE SOFT-START
The AP7173 features a voltage-controlled soft-start that is
programmable with an external capacitor (CSS). The AP7173
achieves a monotonic soft-start by tracking the voltage ramp of
the external soft-start capacitor until the ramp voltage reaches
the internal reference voltage. The relationship between the
soft-start time and the soft-start charging current (ISS), soft-start
capacitance (CSS), and the internal reference voltage (VREF) is
tSS = (VREF x CSS) / ISS
Refer to Table 2 for suggested soft-start capacitor values.


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