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PDF XC9264 Data sheet ( Hoja de datos )
| Número de pieza | XC9264 | |
| Descripción | 18V Operation 0.5A Synchronous Step-Down DC/DC Converters | |
| Fabricantes | Torex Semiconductor | |
| Logotipo |  |
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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 3.0V～18.0V 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
:
3～18V（Absolute Max 20V）
0.75V±1.5%
500kHz, 1.2MHz, 2.2MHz
0.5A
PWM/PFM Auto
Efficiency 85%@12V→5V, 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
1 page  
■ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
VIN Pin Voltage
VIN
-0.3 ～ +20
EN/SS Pin Voltage
VEN/SS
-0.3 ～ +20
FB Pin Voltage
VFB
-0.3 ～ +6.2
PG Pin Voltage (*1)
VPG
-0.3 ～ +6.2
PG Pin Current (*1)
Lx Pin Voltage
IPG 8
VLx -0.3 ～ VIN+0.3 or +20 (*1)
Lx Pin Current
ILx
1800
Power
Dissipation
SOT-25
USP-6C
250
600(when mounted on board)
Pd
120
1000(when mounted on board)
Operating Ambient Temperature
Topr
-40 ～ +105
Storage Temperature
Tstg
-55 ～ +125
* All voltages are described based on the GND pin.
(*1) For the USP-6C Package only.
(*2) The maximum value should be either VIN+0.3 or 20 in the lowest.
XC9263/XC9264
Series
Ta=25℃
UNITS
V
V
V
V
mA
V
mA
mW
℃
℃
5/30
5 Page 
■TYPICAL APPLICATION CIRCUIT (Continued)
<Soft-start Time Setting>
The soft-start time can be adjusted by adding a capacitor and a resistor to the EN/SS pin.
Soft-start time(tss2) is approximated by the equation below according to values of VEN/SS, RSS, and CSS.
tss2=Css×Rss×( -ln( (VEN/SS-1.45)/VEN/SS ) ）
【Setting Example】
When CSS=0.47μF, RSS=430kΩ and VEN/SS=12V, tSS2=0.47x10-6 x 430 x 103 x (-ln((12-1.45)/12))=26ms (Approx.)
*The soft-start time is the time from the start of VEN/SS until the output voltage reaches 90% of the set voltage.
If the EN/SS pin voltage rises steeply without connecting CSS and RSS (RSS=0Ω), Output rises with taking
the soft-start time of tss1=1.0ms (TYP.) which is fixed internally.
XC9263/XC9264
Series
VEN/SS
RSS
CSS
EN/SS
VEN/SS
VOUT
tSS1
tSS2
90 % of se tting voltage
11/30
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet XC9264.PDF ] | |
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