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Torex Semiconductor

XC9263 Datasheet Preview

XC9263 Datasheet

18V Operation 0.5A Synchronous Step-Down DC/DC Converters

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XC9263/XC9264 Series
ETR05047-001
18V Operation 0.5A Synchronous Step-Down DC/DC Converters
GENERAL DESCRIPTION
The XC9263/64 series are 18V operation synchronous step-down DC/DC converter ICs with a built-in high-side / low-side driver
transistor. The XC9263/64 series has operating voltage range of 3.0V18.0V and it can support 0.5A as an output current with
high-efficiency. Compatible with Low ESR capacitors such as ceramic capacitors for the load capacitor (CL).
0.75V reference voltage source is incorporated in the IC, and the output voltage can be set to a value from 1.0V to 15.0V using
external resistors (RFB1, RFB2).
500kHz or 1.2MHz or 2.2MHz can be selected for the switching frequency. In PWM/PFM automatic switchover control, IC can
change the control method between PWM and PFM based on the output current requirement and as a result IC can achieve high
efficiency over the full load range.
XC9263/64 has a fixed internal soft start time which is 1.0ms (TYP.), additionally the time can be extended by using an external
resistor and capacitor.
With the built-in UVLO function, the driver transistor is forced OFF when input voltage goes down to 2.7V or lower.
The output state can be monitored using the power good function.
Over current protection, short-circuit protection and thermal shutdown are embedded and they secure a safety operation.
APPLICATIONS
Hot water supply system
Recorders, Camcorders
Refrigerators, Air-conditioners
Low Power Systems
FEATURES
Input Voltage Range
FB Voltage
Oscillation Frequency
Output Current
Control Methods
:
:
:
:
:
Soft-start Time
Protection Circuits
:
:
Low ESR Ceramic Capacitor :
Package
:
Environmentally Friendly
:
318VAbsolute Max 20V
0.75V±1.5%
500kHz, 1.2MHz, 2.2MHz
0.5A
PWM/PFM Auto
Efficiency 85%@12V5V, 1mA
PWM control
Adjustable by RC
Over Current Protection
Automatic Recovery
(XC9263B/XC9264B)
Integral Latch Method
(XC9263A/XC9264A)
Thermal Shutdown
Ceramic Capacitor
SOT-25 (no Power good)
USP-6C
EU RoHS Compliant, Pb Free
TYPICAL APPLICATION CIRCUIT
L
VIN Lx
CIN RFB1
CFB
EN/SS
FB
RPG
RFB2
CL
GN D
PG
TYPICAL PERFORMANCE
CHARACTERISTICS
XC9264x75C
(VIN=12V, VOUT=5V, fOSC=1200kHz)
L=4.7μH(CLF6045NIT-4R7), CIN=2.2μF(GRM188R61H225KE11),
CL=10μF×2 (GRM188R61E106MA73)
100
90
80
70
60
50
40
30
20
XC9264x75C
10
0
0.1 1 10 100
Output Current :IOUT[mA]
1/30




Torex Semiconductor

XC9263 Datasheet Preview

XC9263 Datasheet

18V Operation 0.5A Synchronous Step-Down DC/DC Converters

No Preview Available !

XC9263/XC9264 Series
BLOCK DIAGRAM
XC9263/64Series
VIN
EN/SS
FB
Chip
Enable
LocalReg
each
circuit
Current
SENSE
Current
feed
back
Current
Limit
Current
Limit
PFM
Under
Voltage
Lock Out
Thermal
Shutdown
Gate
CLAMP
each
Operation circuit
Enable
High
Side
Buffer
Low
Side
Buffer
Vref
Soft Start
+
Err Amp
-
+
PWM
Com pa ra to r
-
PWM/PFM
ControlLOGIC
OSC
Ramp
Wave
+
-
PowerG ood
Co mpa ra tor
Lx
GND
PG(USP-6C Package Only)
*Diodes inside the circuit are an ESD protection diodes and a parasitic diodes.
2/30


Part Number XC9263
Description 18V Operation 0.5A Synchronous Step-Down DC/DC Converters
Maker Torex Semiconductor
Total Page 30 Pages
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