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XRP6670EHTR-F Datasheet(PDF) 7 Page - Exar Corporation

Part # XRP6670EHTR-F
Description  3A 300kHz-2.5MHz Synchronous Step Down Regulator
Download  13 Pages
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRP6670EHTR-F Datasheet(HTML) 7 Page - Exar Corporation

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© 2013 Exar Corporation
7/13
Rev. 1.0.1
THEORY OF OPERATION
FUNCTIONAL DESCRIPTION
The XRP6670 is a synchronous, current-mode,
step-down
regulator.
It
regulates
input
voltages from 2.6V to 5.5V and supplies up to
3A of output current IOUT. The XRP6670 uses
current-mode control to regulate the output
voltage VOUT. The VOUT is measured at FB
through a resistive voltage divider and input to
a transconductance error amplifier. The high-
side switch current is compared to the output
of the error amplifier to control the output
voltage.
The
regulator
utilizes
internal
P-
channel and N-channel MOSFETs to step-down
the input voltage. Because the high-side FET is
P-channel a bootstrapping capacitor is not
necessary and the regulator can operate at
100% duty cycle. The XRP6670 has several
powerful protection features including OCP,
OTP, UVLO and output short-circuit.
SHORT
-CIRCUIT AND OVER-CURRENT
PROTECTION OCP
The XRP6670 protects itself and downstream
circuits against accidental increase in current
or short-circuit. If peak current through the
switching FET increases above 4.2A (nominal)
the regulator enters an idle state where the
internal FETs are turned off and softstart is
pulled low. After a period of 2000xT the
regulator will attempt a softstart. If the high
current
persists
the
protection
cycle
will
repeat.
SOFT
-START
XRP6670 has an integrated soft-start which is
preset at 1.5ms (nominal). This feature limits
the inrush current during startup and allows
the output voltage to smoothly rise to its
programmed value.
POWER GOOD FLAG
This open drain output (PGOOD) can be used
to monitor whether the output voltage is
within regulation (±15%). PGOOD is pulled to
ground when VOUT is not in regulation. PGOOD
should be tied to VDD with a 100k resistor.
PROGRAMMABLE FREQUENCY
The
switching
frequency
is
programmable
within a range of 300kHz to 2.5MHz via a
resistor placed between SHDN/RT and GND
pins. An equation for calculating a resistor
value for a target frequency is given the
Application Information section.
100% DUTY CYCLE AND LDO OPERATION
The XRP6670 switching FET is a P-channel
device and therefore can operate at 100%
duty cycle. In battery operated applications
where VIN will droop, XRP6670 can seamlessly
transition from PWM to LDO mode.
OVER
-TEMPERATURE PROTECTION OTP
If the junction temperature exceeds 160°C the
OTP circuit is triggered, turning off the internal
control
circuit
and
FETs.
When
junction
temperature drops below 140°C the XRP6670
will restart.
Although thermal shutdown is built-in in the
XRP6670 to protect the device from thermal
damage, the total power dissipation that the
XRP6670 can sustain is based on the package
thermal capability. Equation 1 shown on page
two,
can
be
used
to
calculate
junction
temperature and ensure operation within the
recommended
maximum
temperature
of
125°C.
APPLICATION INFORMATION
PROGRAMMING THE OUTPUT VOLTAGE
Use an external resistor divider to set the
output
voltage
based
on
the
following
equation:
2
1
0.800 1
Where:
R1
is
the
resistor
between
VOUT and FB
(nominally set at 100kΩ)


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