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PDF MXT2482SX Data sheet ( Hoja de datos )

Número de pieza MXT2482SX
Descripción 450 kHz Synchronous Rectified Step-Down Converter
Fabricantes ETC 
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MXT2482SX/A
2-2.5A, 23V, 450 kHz Synchronous Rectified Step-Down Converter
DESCRIPTION
The MXT2482SX is amonolithic synchronous buck regulator. The device integrates 150m
MOSFETS that provide 2A continuous load current over a wide operating input voltage of
4.5 to 23V. Current mode control provides fast transient response and cycle-by-cycle
current limit.
An adjustable soft-start prevents inrush current at turn-on. In shutdown mode, the supply
current drops below 1µA.
This device, available in an 8-pin SOIC package, provides a very compact system solution
with minimal reliance on external components.
PACKAGE REFERENCE FEATURES
. • 2-2.5A Output Current
. • Wide 4.5-23V Operating Input Range
. • Integrated 150mPower MOSFET Switches
. • Output Adjustable from from 0.925 to 20V
. • Up to 95% Efficiency
. • Programmable Soft-Start
. • Stable with Low ESR Ceramic Output Capacitors
. • Fixed 450KHz Frequency
. • Cycle-by-Cycle Over Current Protection
. • Input Under Voltage Lockout
. • Thermally Enhanced 8-Pin SOIC/SOIC-E Package
APPLICATIONS
. • Distributed Power Systems
. • Networking Systems
. • FPGA, DSP, ASIC Power Supplies
. • Green Electronics/ Appliances
. • Notebook Computers
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Free Datasheet http://www.datasheet4u.com/

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MXT2482SX pdf
MXT2482SX/A
2-2.5A, 23V, 450 kHz Synchronous Rectified Step-Down Converter
OPERATION
FUNCTIONAL DESCRIPTION
The MXT2482SX is a synchronous rectified, current-mode, step-down regulator. It regulates
input voltages from 4.5V to 23V down to an output voltage as low as 0.925V, and supplies up
to 2A of load current. The MXT2482SX uses current-mode control to regulate the output voltage.
The output voltage is measured at FB through a resistive voltage divider and amplified
through the internal transconductance error amplifier. The voltage at the COMP pin is
compared to the switch current measured internally to control the output voltage.
The converter uses internal N-Channel MOSFET switches to step-down the input voltage to
the regulated output voltage. Since the high side MOSFET requires a gate voltage greater
than the input voltage, a boost capacitor connected between SW and BS is needed to drive
the high side gate. The boost capacitor is charged from the internal 5V rail when SW is low.
When the MXT2482SX FB pin exceeds 20% of the nominal regulation voltage of 0.925V, the
over voltage comparator is tripped and the COMP pin and the SS pin are discharged to GND,
forcing the high-side switch off.
Figure 1 – Functional Block Diagram
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