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AOZ1022DI-01
Rev.3.1 August 2018 www.aosmd.com Page 7 of 15
Detailed Description
The AOZ1022DI-01 is a current-mode step down
regulator with integrated high-side PMOS switch and a
low-side NMOS switch. It operates from a 4.5V to 16V
input voltage range and supplies up to 3A of load current.
The duty cycle can be adjusted from 6% to 100%
allowing a wide range of output voltage. Features include
enable control, Power-On Reset, input under voltage
lockout, output over voltage protection, active high power
good state, fixed internal soft-start and thermal shut-
down.
The AOZ1022DI-01 is available in an DFN 5x4 package.
Enable and Soft Start
The AOZ1022DI-01 has an internal soft start feature to
limit in-rush current and ensure the output voltage ramps
up smoothly to regulation voltage. A soft start process
begins when the input voltage rises to 4.1V and voltage
on EN pin is HIGH. In the soft start process, the output
voltage is typically ramped to regulation voltage in 4ms.
The 4ms soft start time is set internally.
The EN pin of the AOZ1022DI-01 is active HIGH.
Connect the EN pin to VIN if the enable function is not
used. Pulling EN to ground will disable the AOZ1022DI-
01. Do not leave it open. The voltage on the EN pin must
be above 2V to enable the AOZ1022DI-01. When voltage
on the EN pin falls below 0.6V, the AOZ1022DI-01 is
disabled. If an application circuit requires the
AOZ1022DI-01 to be disabled, an open drain or open
collector circuit should be used to interface to the EN pin.
Power Good
The output of Power-Good is an open drain N-channel
MOSFET which supplies an active high power good
stage. A pull-up resistor (R3) should connect this pin to a
DC power trail with maximum voltage of 6V. The
AOZ1022DI-01 monitors the FB voltage. When FB
voltage is lower than 90% of the normal voltage,
N-channel MOSFET turns on and the Power-Good pin is
pulled low. This indicates the power is abnormal.
Steady-State Operation
Under steady-state conditions, the converter operates in
fixed frequency and Continuous-Conduction Mode
(CCM).
The AOZ1022DI-01 integrates an internal P-MOSFET as
the high-side switch. Inductor current is sensed by
amplifying the voltage drop across the drain to source of
the high side power MOSFET. Output voltage is divided
down by the external voltage divider at the FB pin. The
difference of the FB pin voltage and reference is
amplified by the internal transconductance error
amplifier. The error voltage, which shows on the COMP
pin, is compared against the current signal, which is sum
of inductor current signal and ramp compensation signal,
at the PWM comparator input. If the current signal is less
than the error voltage, the internal high-side switch is on.
The inductor current flows from the input through the
inductor to the output. When the current signal exceeds
the error voltage, the high-side switch is off. The inductor
current is freewheeling through the internal low-side
N-MOSFET switch to output. The internal adaptive FET
driver guarantees no turn on overlap of both high-side
and low-side switch.
Comparing with regulators using freewheeling Schottky
diodes, the AOZ1022DI-01 uses freewheeling NMOS-
FET to realize synchronous rectification. It greatly
improves the converter efficiency and reduces power
loss in the low-side switch.
The AOZ1022DI-01 uses a P-Channel MOSFET as the
high-side switch. It saves the bootstrap capacitor
normally seen in a circuit which is using an NMOS
switch. It allows 100% turn-on of the high-side switch to
achieve linear regulation mode of operation. The
minimum voltage drop from VIN to VO is the load current
x DC resistance of MOSFET + DC resistance of buck
inductor. It can be calculated by the equation below:
where;
VO_MAX is the maximum output voltage,
VIN is the input voltage from 4.5V to 16V,
IO is the output current from 0A to 3A, and
RDS(ON) is the on resistance of internal MOSFET, the value is
between 97mΩ and 200mΩ depending on input voltage and
junction temperature.
Switching Frequency
The AOZ1022DI-01 switching frequency is fixed and set
by an internal oscillator. The practical switching
frequency could range from 350kHz to 600kHz due to
device variation.
Output Voltage Programming
Output voltage can be set by feeding back the output to
the FB pin by using a resistor divider network. See the
application circuit shown in Figure 1. The resistor divider
network includes R1 and R2. Usually, a design is started
by picking a fixed R2 value and calculating the required
R1 with equation:
VO0.8 1 R1
R2
-------
+
=