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MXT2482SX 데이터시트 PDF




ETC에서 제조한 전자 부품 MXT2482SX은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 MXT2482SX 기능
기능 450 kHz Synchronous Rectified Step-Down Converter
제조업체 ETC
로고 ETC 로고


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MXT2482SX 데이터시트, 핀배열, 회로
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
1/1
Free Datasheet http://www.datasheet4u.com/




MXT2482SX pdf, 반도체, 판매, 대치품
MXT2482SX/A
2-2.5A, 23V, 450 kHz Synchronous Rectified Step-Down Converter
TYPICAL APPLICATION
MXT2482SX
PIN FUNCTIONS
Pin #
1
2
3
4
5
6
7
8
Name
BS
IN
SW
GND
FB
COMP
EN
SS
Description
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel
MOSFET switch. Connect a 0.01µF or greater capacitor from SW to BS to power the
high side switch.
Power Input. IN supplies the power to the IC, as well as the step-down converter
switches. Drive IN with a 4.5V to 23V power source. Bypass IN to GND with a suitably
large capacitor to eliminate noise on the input to the IC. See Input Capacitor.
Power Switching Output. SW is the switching node that supplies power to the output.
Connect the output LC filter from SW to the output load. Note that a capacitor is required
from SW to BS to power the high-side switch.
Ground (Connect Exposed Pad to Pin 4).
Feedback Input. FB senses the output voltage to regulate that voltage. Drive FB with a
resistive voltage divider from the output voltage. The feedback threshold is 0.925V. See
Setting the Output Voltage.
Compensation Node. COMP is used to compensate the regulation control loop. Connect
a series RC network from COMP to GND to compensate the regulation control loop. In
some cases, an additional capacitor from COMP to GND is required. See
Compensation Components.
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn
on the regulator, drive it low to turn it off. Pull up with 100kresistor for automatic
startup.
Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor from SS to
GND to set the soft-start period. A 0.1µF capacitor sets the soft-start period to 15ms. To
disable the soft-start feature, leave SS unconnected.
4/4
Free Datasheet http://www.datasheet4u.com/

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MXT2482SX 전자부품, 판매, 대치품
MXT2482SX/A
2-2.5A, 23V, 450 kHz Synchronous Rectified Step-Down Converter
Inductor
The inductor is required to supply constant current to the output load while being driven by
the switched input voltage. A larger value inductor will result in less ripple current that will
result in lower output ripple voltage. However, the larger value inductor will have a larger
physical size, higher series resistance, and/or lower saturation current. A good rule for
determining the inductance to use is to allow the peak-to-peak ripple current in the inductor
to be approximately 30% of the maximum switch current limit. Also, make sure that the peak
inductor current is below the maximum switch current limit. The inductance value can be
Part Number
B130
SK13
MBRS130
Voltage/Current
Rating
30V, 1A
30V, 1A
30V, 1A
Vendor
Diodes, Inc.
Diodes, Inc.
International
Rectifier
Input Capacitor
The input current to the step-down converter is discontinuous, therefore a capacitor is
required to supply the AC current to the step-down converter while maintaining the DC input
voltage. Use low ESR capacitors for the best performance. Ceramic capacitors are preferred,
but tantalum or low-ESR electrolytic capacitors may also suffice. Choose X5R or X7R
dielectrics when using ceramic capacitors. Since the input capacitor absorbs the input
switching current it requires an adequate ripple current rating. The RMS current in the input
capacitor can be estimated by:
The worst-case condition occurs at VIN = 2VOUT, where ICIN = ILOAD/2. For simplification,
choose the input capacitor whose RMS current rating greater than half of the maximum load
current. The input capacitor can be electrolytic, tantalum or ceramic. When using electrolytic
or tantalum capacitors, a small, high quality ceramic capacitor, i.e. 0.1µF, should be placed
as close to the IC as possible. When using ceramic capacitors, make sure that they have
enough capacitance to provide sufficient charge to prevent excessive voltage ripple at input.
The input voltage ripple for low ESR capacitors can be estimated by:
Where CIN is the input capacitance value.
7/7
Free Datasheet http://www.datasheet4u.com/

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