XC9263/XC9264Series
18V Operation 0.5A Synchronous Step-Down DC/DC Converters
ETR05047-006
■GENERAL DESCRIPTION
The XC9263/XC9264 series are 18V operation synchronous step-down DC/DC converter ICs with a built-in high-side / low-side
driver transistor. The XC9263/XC9264 series has operating voltage range of 3.0V~18.0V and it can support 500mA 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 and thermal shutdown are embedded and they secure a safety operation.
■FEATURES
Input Voltage Range
FB Voltage
■APPLICATIONS
● Hot water supply system
● Recorders, Camcorders
● Refrigerators, Air-conditioners
● Low Power Systems
:
:
:
:
:
3.0 ~ 18V (Absolute Max 20V)
0.75V±1.5%
Oscillation Frequency
Output Current
500kHz, 1.2MHz, 2.2MHz
500mA
Control Methods
PWM/PFM Auto
Efficiency 85%@12V→5V, 1mA
PWM control
Soft-start Time
:
:
Adjustable by RC
Protection Circuits
Over Current Protection
Automatic Recovery (B Type)
Integral Latch Method (A Type)
Thermal Shutdown
Output Capacitor
Package
:
:
Ceramic Capacitor
SOT-25 (No Power good)
USP-6C (With Power Good)
EU RoHS Compliant, Pb Free
Environmentally Friendly
:
■TYPICAL PERFORMANCE
■TYPICAL APPLICATION CIRCUIT
CHARACTERISTICS
XC9264x75C
(VIN=12V, VOUT=5V, fOSC=1200kHz)
L
VIN
Lx
L=4.7μ H(CLF6045NIT-4R7), CIN=2.2μ F(GRM188R61H225KE11),
CL=10μ F×2 (GRM188R61E106MA73)
CIN
RFB1
100
CFB
90
80
70
60
50
40
30
EN/SS
FB
CL
RFB2
RPG
GND
PG
20
XC9264x75C
10
0
0.1
1
10
100
Output Current :IOUT[mA]
1/30