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Torex Semiconductor

XC9248 Datasheet Preview

XC9248 Datasheet

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

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XC9248 Series
ETR05022-007
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
Note PCs / Tablet PCs
Car accessories power supplies
FEATURES
Input Voltage
4.5V 18V
Output Voltage
Output Current
1.0V 12V (VFB=0.8V±1.5%) (*1)
2.2A
Efficiency
Oscillation Frequency
93.8% (*1) @VIN=12V,VOUT=5V, IOUT=700mA
500kHz
Maximum Duty Cycle
79%
Soft-Start Time
Fixed 2.8ms, set by external capacitor
Protection Circuit
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
1/22




Torex Semiconductor

XC9248 Datasheet Preview

XC9248 Datasheet

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

No Preview Available !

XC9248 Series
BLOCK DIAGRAM
* Internal diodes include an ESD protection diode and a parasitic diode.
PRODUCT CLASSIFICATION
Ordering Information
XC9248①②③④⑤⑥-⑦
DESIGNATOR
②③
⑤⑥-(*1)
ITEM
TYPE
FB Voltage
Oscillation Frequency
Package
SYMBOL
A
B
08
5
QR-G
DESCRIPTION
Refer to Selection Guide
FB voltage is fixed in 0.8V
500kHz
SOP-8FD (1,000pcs/Reel)
(*1) The “-G” suffix denotes Halogen and Antimony free as well as being fully EU RoHS compliant.
Selection Guide
TYPE CURRENT LIMITER
A YES
B YES
LATCH FOR
CURRENT LIMITER
YES (*1)
NO
LATCH FOR
VOUT-SHORT
YES
NO
LATCH FOR
LX-SHORT (*2)
YES
YES
TYPE
A
B
ENABLE
YES
YES
UVLO
YES
YES
CL
AUTO-DISCHARGE
YES
YES
THERMAL
SHUTDOWN
YES
YES
(*1) The over-current protection latch is an integral latch type.
(*2) To prevent an extremely large rush current from flowing in the event that Lx is short-circuited, both the A & B types have an Lx short
protection latch function.
2/22


Part Number XC9248
Description 18V Driver Transistor Built-In Synchronous Step-Down DC/DC Converter
Maker Torex Semiconductor
Total Page 22 Pages
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