MXT2482SX Datasheet PDF - ETC

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MXT2482SX
ETC

Part Number MXT2482SX
Description 450 kHz Synchronous Rectified Step-Down Converter
Page 10 Pages


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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
1/1
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MXT2482SX/A
2-2.5A, 23V, 450 kHz Synchronous Rectified Step-Down Converter
MXT2482SX
MXT2482SX
MXT2482SX
MXT2482SX
MXT2482SXA
MXT2482SX
MXT2482SX
MXT2482SX
(1)
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VIN).......................-0.3V to 26V
Switch Voltage (VSW)............. –1V to VIN + 0.3V
Bootstrap Voltage (VBS) ...Vsw-0.3V to VSW + 6V
Enable/UVLO Voltage (VEN)...........–0.3V to +6V
Comp Voltage (VCOMP) ...................–0.3V to +6V
Feedback Voltage (VFB) ................–0.3V to +6V
Junction Temperature ........................... +150°C
Lead Temperature ................................. +260°C
Storage Temperature.............. –55°C to +150°C
MXT2482SX
(2)
Recommended Operating Conditions
Input Voltage (VIN) ......................... 4.5V to 23V
Output Voltage (VSW) ....................... 0.925 to 20V
Operating Temperature...............–20°C to +85°C
Thermal Resistance(3) θJA θJC
SOIC8N(4) .............................. 50...... 10... °C/W
Notes:
1) Exceeding these ratings may damage the device. 2) The device is not guaranteed to function outside of its
operating conditions. 3) Measured on approximately 1” square of 1 oz copper. 4) Measured only with solder exposed pad to
board
2/2
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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
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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
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