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MXT2482SXA の電気的特性と機能

MXT2482SXAのメーカーはETCです、この部品の機能は「450 kHz Synchronous Rectified Step-Down Converter」です。


製品の詳細 ( Datasheet PDF )

部品番号 MXT2482SXA
部品説明 450 kHz Synchronous Rectified Step-Down Converter
メーカ ETC
ロゴ ETC ロゴ 




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MXT2482SXA Datasheet, MXT2482SXA PDF,ピン配置, 機能
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/

1 Page





MXT2482SXA pdf, ピン配列
MXT2482SX/A
2-2.5A, 23V, 450 kHz Synchronous Rectified Step-Down Converter
ELECTRICAL CHARACTERISTICS
VIN = 12V, TA = +25°C, unless otherwise noted.
Parameter
Shutdown Supply Current
Supply Current
Feedback Voltage
Feedback Overvoltage Threshold
Error Amplifier Voltage
Error Amplifier Transconductance
High-Side Switch-On Resistance
Low-Side Switch-On Resistance
High-Side Switch Leakage
Upper Switch Current Limit
Lower Switch Current Limit
COMP to Current Sense
Transconductance
Oscillator Frequency
Short Circuit Frequency
Maximum Duty Cycle
Minimum On Time
EN Shutdown Threshold Voltage
EN Shutdown Threshold Voltage
Hysterisis
EN Lockout Threshold Voltage
EN Lockout Hysterisis
Input UVLO Threshold Rising
Input UVLO Threshold Hysteresis
Soft-start Current
Soft-start Period
Thermal Shutdown4
Note:
4) Guaranteed by design
Condition
VEN 0.3V
VEN 2.6V, VFB = 1.0V
4.5V VIN 23V
Min
900
IC = 10µA
VEN = 0V, VSW = 0V
2.4
VFB = 0V
VFB = 0.8V
VEN Rising
VIN Rising
VSS = 0V
CSS = 0.1µF
400
1.1
2.2
3.80
Typ
0.3
1.3
925
1.1
480
800
150(4)
150(4)
0.1
3.7
0.9
4.0
450
160
90
120
1.5
140(4)
2.5
140(4)
4.10
210
6.0
15
160
Max
3.0
1.5
950
10
500
2.0
2.7
4.40
Units
µA
mA
mV
V
V/V
µA/V
m
m
µA
A
A
А/V
KHz
KHz
%
nS
V
mV
V
mV
V
mV
µA
ms
C
3/3
Free Datasheet http://www.datasheet4u.com/


3Pages


MXT2482SXA 電子部品, 半導体
MXT2482SX/A
2-2.5A, 23V, 450 kHz Synchronous Rectified Step-Down Converter
APPLICATION INFORMATION COMPONENT SELECTION Setting
the Output Voltage
The output voltage is set using a resistive
voltage divider from the output voltage to FB
(see Typical Application circuit on page 1). The
voltage divider divides the output voltage down
by the rat
io:
Where VFB is the feedback voltage and VOUT is
the output voltage.
Thus the output voltage is:
R2 can be as high as 100k, but a typical value is 10k. Using the typical value for R2, R1
is determined by:
For example, for a 3.3V output voltage, R2 is 10k, and R1 is 26.1k. Table 1 lists
recommended resistance values of R1 and R2 for standard output voltages.
calculated by:
Where VOUT is the output voltage, VIN is the input voltage, fS is the switching frequency, and
IL is the peak-to-peak inductor ripple current. Choose an inductor that will not saturate
under the maximum inductor peak current. The peak inductor current can be calculated by:
Where ILOAD is the load current. The choice of which style inductor to use mainly depends on
the price vs. size requirements and any EMI requirements.
Optional Schottky Diode
During the transition between high-side switch and low-side switch, the body diode of the
lowside power MOSFET conducts the inductor current. The forward voltage of this body
diode is high. An optional Schottky diode may be paralleled between the SW pin and GND
pin to improve overall efficiency. Table 2 lists example Schottky diodes and their
Manufacturers.
Table 2 – Diode Selection Guide
6/6
Free Datasheet http://www.datasheet4u.com/

6 Page



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部品番号部品説明メーカ
MXT2482SX

450 kHz Synchronous Rectified Step-Down Converter

ETC
ETC
MXT2482SXA

450 kHz Synchronous Rectified Step-Down Converter

ETC
ETC


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