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XC9248 fiches techniques PDF

Torex Semiconductor - 18V Driver Transistor Built-In Synchronous Step-Down DC/DC Converter

Numéro de référence XC9248
Description 18V Driver Transistor Built-In Synchronous Step-Down DC/DC Converter
Fabricant Torex Semiconductor 
Logo Torex Semiconductor 





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XC9248 fiche technique
XC9248 Series
ETR05022-004
18V Driver Transistor Built-In Synchronous Step-Down DC/DC Converter
GENERAL DESCRIPTION
The XC9248 series is 18V bootstrap synchronous step-down DC/DC converter with built-in Nch-Nch driver transistors.
With an input voltage range from 4.5V to 18V and a maximum output current of 2.2A, the series is suitable for digital home
appliance power supplies and can be used with small ceramic capacitors.
The series has a 0.8V reference voltage, and using externally connected resistors, the output voltage can be set freely from
1.0V to 12V.
The control method is synchronous PWM (Source/ Sink). The soft start time is internally set to 2.8ms (TYP.), also can be
adjusted using external capacitor.
With UVLO (Under Voltage Lock Out) function, the internal driver transistors are forced OFF when input voltage falls down
below 3.8V (TYP.).
The series includes over current protection, VOUT short-circuit protection, Lx short-circuit protection, VOUT overvoltage
protection and thermal shutdown.
APPLICATIONS
Digital home appliance
Office automation equipment
Notebook computers
Car accessories power supplies
FEATURES
Input Voltage
Output Voltage
Output Current
Efficiency
Oscillation Frequency
4.5V 18V
1.0V12V (VFB=0.8V±1.5%) (*1)
2.2A
93.8% (*1) @VIN=12V,VOUT=5V, IOUT=700mA
500kHz
Maximum Duty Cycle
79%
Soft-Start Time
Fixed2.8ms, set by external capacitor
Protection Circuit
http://www.DataSheet4U.net/
UVLO
High side over current protection
Low side over current protection
VOUT Short-circuit Protection
LX Short-circuit Protection
VOUT Over voltage protection
Thermal shutdown
Package
SOP-8FD
Environmentally Friendly EU RoHS Compliant, Pb Free
(*1) Performance depends on external components and wiring on the PCB.
TYPICAL APPLICATION CIRCUIT
TYPICAL PERFORMANCE
CHARACTERISTICS
VIN
EN
CIN CSS
VIN LX
EN GND CBST
SS BST
FB VL
CVL
L
CFB
CL
VOUT
RFB1
RFB2
Efficiency vs. Output Current
100
90
80
70
60
50
40
30
20
10
0
0
Ta=25°C
VIN=12V , VOUT=5V
VIN=12V , VOUT=3.3V
500
1000
1500
Output Current : IOUT [mA]
2000
1/21
datasheet pdf - http://www.DataSheet4U.net/

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