XC9263/XC9264
Series
18V Operation 0.5A Synchronous Step-Down DC/DC Converters
ETR05047-002
■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 3.0V½18.0V 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 (C
L
).
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 (R
FB1
, R
FB2
).
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
:
:
:
:
:
3½18V（Absolute Max 20V）
0.75V±1.5%
500kHz, 1.2MHz, 2.2MHz
0.5A
PWM/PFM Auto
Efficiency 85%@12V→5V, 1mA
PWM control
Soft-start Time
Protection Circuits
:
:
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
Environmentally Friendly
:
EU RoHS Compliant, Pb Free
Low ESR Ceramic Capacitor
Package
:
:
■TYPICAL
APPLICATION CIRCUIT
■TYPICAL
PERFORMANCE
CHARACTERISTICS
XC9264x75C
(V
IN
=12V, V
OUT
=5V, f
OSC
=1200kHz)
L=4.7μH(CLF6045NIT-4R7), C
IN
=2.2μF(GRM188R61H225KE11),
C
L
=10μF×2 (GRM188R61E106MA73)
100
90
80
70
60
50
40
30
20
10
0
0.1
1
10
100
XC9264x75C
L
V
IN
C
IN
Lx
R
FB1
C
FB
EN/SS
FB
C
L
R
FB2
R
PG
GN D
PG
Efficiency :EFFI[%]
Output Current :I
OUT
[mA]
1/33
XC9263/XC9264
Series
■PRODUCT
CLASSIFICATION
●Ordering
Information
XC9263①②③④⑤⑥-⑦
(*1)
PWM control
XC9264①②③④⑤⑥-⑦
(*1)
PWM/PFM Auto
DESIGNATOR
①
②③
④
ITEM
Type
Adjustable Output Voltage
Oscillation Frequency
SYMBOL
A
B
75
5
C
D
⑤⑥-⑦
Packages (Order Unit)
MR-G
(*1)
DESCRIPTION
Refer to Selection Guide
Output voltage can be adjusted in 1V to 15V
500kHz
1.2MHz
2.2MHz
SOT-25 (3,000pcs/Reel)
ER-G
(*1)
USP-6C (3,000pcs/Reel)
(*1)
The “-G” suffix denotes Halogen and Antimony free as well as being fully EU RoHS compliant.
●Selection
Guide
TYPE
A
B
Packages
Current
Limitter
YES
YES
Automatic Recovery
(Current Limitter)
Latch Protection
(Current Limitter)
Chip Enable
YES
YES
MR-G
NO
YES
Thermal
Shutdown
YES
YES
Automatic Recovery
(Current Limitter)
YES
(*2)
NO
TYPE
A
B
Packages
UVLO
YES
YES
Current
Limitter
YES
YES
Soft Start
YES
YES
Latch Protection
(Current Limitter)
Power Good
NO
NO
MR-G
TYPE
A
B
Packages
Chip Enable
YES
YES
ER-G
NO
YES
Thermal
Shutdown
YES
YES
YES
(*2)
NO
TYPE
A
B
(*2)
Packages
UVLO
YES
YES
Soft Start
YES
YES
Power Good
YES
YES
ER-G
The over-current protection latch is an integral latch type.
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XC9263/XC9264
Series
■PIN
CONFIGURATION
Lx
5
FB
4
V
IN
EN/SS
PG
6
5
4
1
2
3
Lx
GND
FB
1
2
3
V
IN
GND
EN/SS
SOT-25
(TOP VIEW)
USP-6C
(BOTTOM VIEW)
* The dissipation pad for the USP-6C package should be solder-plated in recommended mount pattern and metal masking so
as to enhance mounting strength and heat release. If the pad needs to be connected to other pins, it should be connected
to the GND (No. 2) pin.
■PIN
ASSIGNMENT
PIN NUMBER
SOT-25
1
3
-
4
2
5
USP-6C
6
5
4
3
2
1
PIN NAME
V
IN
EN/SS
PG
FB
GND
Lx
FUNCTION
Power Input
Enable Soft-start
Power good Output
Output Voltage Sense
Ground
Switching Output
■FUNCTION
CHART
PIN NAME
EN/SS
(*1)
SIGNAL
L
H
OPEN
STATUS
Stand-by
Active
Undefined State
(*1)
Please do not leave the EN/SS pin open. Each should have a certain voltage.
4/33
XC9263/XC9264
Series
■ABSOLUTE
MAXIMUM RATINGS
Ta=25℃
PARAMETER
SYMBOL
RATINGS
UNITS
V
IN
Pin Voltage
EN/SS Pin Voltage
FB Pin Voltage
PG Pin Voltage
(*1)
PG Pin Current
(*1)
Lx Pin Voltage
Lx Pin Current
SOT-25
Power
Dissipation
V
IN
V
EN/SS
V
FB
V
PG
I
PG
V
Lx
I
Lx
-0.3
½
+20
-0.3
½
+20
-0.3
½
+6.2
-0.3
½
+6.2
8
-0.3
½
V
IN
+0.3 or +20
(*2)
1800
250
600(40mm x 40mm Standard board)
(*3)
V
V
V
V
mA
V
mA
Pd
USP-6C
120
1000(40mm x 40mm Standard board)
(*3)
1250 (JEDEC board)
(*3)
mW
Operating Ambient
Temperature
Storage Temperature
(*1)
(*2)
(*3)
Topr
Tstg
-40
½
+105
-55
½
+125
℃
℃
* All voltages are described based on the GND pin.
For the USP-6C Package only.
The maximum value should be either V
IN
+0.3 or 20 in the lowest.
The power dissipation figure shown is PCB mounted. Please see the power dissipation page for the mounting condition.
5/33
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