XC9223/XC9224
Series
1A Driver Transistor Built-In Step-Down DC/DC Converters
ETR0509_015
☆GreenOperation-Compatible
■GENERAL
DESCRIPTION
The XC9223/XC9224 series are synchronous step-down DC/DC converters with a 0.21Ω (TYP.) P-channel driver transistor and a
synchronous 0.23Ω (TYP.) N-channel switching transistor built-in. A highly efficient and stable current can be supplied up to 1.0A by
reducing ON resistance of the built-in transistor. With a high switching frequency of 1.0MHz or 2.0MHz, a small inductor is selectable;
therefore, the XC9223/XC9224 series are ideally suited to applications with height limitation such as HDD or space-saving
applications. Current limit value can be chosen either 1.2A (MIN.) when the LIM pin is high level, or 0.6A (MIN.) when the LIM pin is
low level for using the power supply which current limit value differs such as USB or AC adapter. With the MODE/SYNC pin, the
XC9223/XC9224 series provide mode selection of the fixed PWM control or automatically switching current limit PFM/PWM control.
As for preventing unwanted switching noise, the XC9223/XC9224 series can be synchronized with an external clock signal within the
range of ± 25% toward an internal clock signal via the MODE/SYNC pin. For protection against heat damage of the ICs, the
XC9223/XC9224 series build in three protection functions: integral latch protection, thermal shutdown, and short-circuit protection.
With the built-in UVLO (Under Voltage Lock Out) function, the internal P-channel driver transistor is forced OFF when input voltage
becomes 1.8V or lower. The XC9223B/XC9224B series’ detector function monitors the discretional voltage by external resistors.
■APPLICATIONS
●Magnetic
disk drive
●Note
PCs / Tablet PCs
●CD-R
/ RW, DVD
●Mobile
devices / terminals
●Digital
still cameras / Camcorders
●Multi-function
power supplies
■FEATURES
Input Voltage Range
Output Voltage Range
Oscillation Frequency
Output Current
Maximum Current
Limit
Controls
Protection Circuits
: 2.5V ~ 6.0V
: 0.9V ~ V
IN (set by FB pin)
: 1MHz, 2MHz (+15% accuracy)
: 1.0A
: 0.6A (MIN.) ~ 0.9A (MAX)
with LIM pin=’L’
: 1.2A (MIN.) ~ 2.0A (MAX.)
with LIM pin=’H’
: PWM/PFM or PWM by MODE pin
: Thermal shutdown
Integral latch method
Short-circuit protection
: 1ms (TYP.) internally set
: 0.712V Detection,
N-channel open drain
: 0.21Ω
Soft-Start Time
Voltage Detector
Built-in P-channel
MOSFET
Built-in Synchronous
: 0.23Ω
N-channel MOSFET
(No Schottky Barrier Diode Required)
High Efficiency
: 95% (V
IN
=5.0V, V
OUT
=3.3V)
Synchronized with an External Clock Signal
Ceramic Capacitor Compatible
Packages
: MSOP-10, USP-10B
* SOP-8 package is available for the XC9223D type only.
Environmentally Friendly
: EU RoHS Compliant, Pb Free
■TYPICAL
APPLICATION CIRCUIT
■TYPICAL
PERFORMANCE
CHARACTERISTICS
●
Efficiency vs. Output Current
XC9223B081Ax
XC9223B081Ax
100
90
80
Efficiency: EFFI (%)
70
60
50
40
30
20
10
0
1
10
100
Output Current: IOUT (mA)
1000
PW M/PFM
PW M
VOUT=1.5V
VOUT=3.3V
VIN=5V, FOSC=1MHz,
VIN=5V, FOSC=1M Hz, L =4.7uH(CDRH4D2 8C),
L=4.7μH (CDRH4D28C), CIN=10μF (ceramic), CL=10μF (ceramic)
CIN=10 uF(ceram i c), CL=1 0uF(cera m i c)
(*1) A capacitor of 2200pF
½
0.1μF is recommended to place at the C
DD
between the AGND
pin and the V
IN
pin.
Please refer to the page showing INSTRUCTION ON PATTERN LAYOUT for more detail.
1/25
XC9223/XC9224
Series
■PIN
CONFIGURATION
VIN 1
VDIN 2
AGND 3
VDOUT 4
FB 5
10 PGND
9 LX
8 CE
7 MODE/SYNC
6 LIM
MSOP-10
(TOP VIEW)
FB 5
VDOUT 4
AGND 3
VDIN 2
VIN 1
6
7
8
9
LIM
MODE/SYNC
CE
LX
10 PGND
USP-10B
(BOTTOM VIEW)
■PIN
ASSIGNMENT
PIN NUMBER
MSOP-10 * USP-10B *
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
PIN NAME
V
IN
V
DIN
A
GND
V
DOUT
FB
LIM
MODE/SYNC
CE
Lx
P
GND
FUNCTION
Input
Voltage Detector Input
Analog Ground
VD Output
Output Voltage Monitor
Over Current Limit Setting
Mode Switch / External Clock Input
Chip Enable
Output of Internal Power Switch
Power Ground
* For MSOP-10 and USP-10B packages, please short the GND pins (pin #3 and 10)
■FUNCTION
CHART
1. CE Pin Function
CE PIN
H
L
OPERATIONAL STATE
ON
OFF *1
*1: Except for a voltage detector block in the XC9224 series.
2. MODE Pin Function
MODE PIN
H
L
LIM PIN
H
L
FUNCTION
PWM Control
PWM/PFM Automatic Control
FUNCTION
Maximum Output Current: 1.0A
Maximum Output Current: 0.4A
3. LIM Pin Function
2/25
XC9223/XC9224
Series
■ELECTRICAL
CHARACTERISTICS
XC9223/XC9224 Series
PARAMETER
Input Voltage
FB Voltage
Output Voltage Setting Range
Maximum Output Current 1 (*1)
Maximum Output Current 2 (*1)
U.V.L.O. Voltage
Supply Current 1
Supply Current 2
Stand-by Current
Oscillation Frequency
External Clock Signal
Synchronized Frequency
External Clock Signal Cycle
Maximum Duty Cycle
Minimum Duty Cycle
PFM Switch Current
Efficiency (*3)
Lx SW ‘H’ On Resistance (*4)
Lx SW ‘L’ On Resistance
Current Limit 1
Current Limit 2
Integral Latch Time (*5)
Short Detect Voltage
Soft-Start Time
Thermal Shutdown Temperature
Hysteresis Width
CE ‘H’ Voltage
SYMBOL
V
IN
V
FB
V
OUTSET
I
OUTMAX1
I
OUTMAX2
V
UVLO
I
DD1
I
DD2
I
STB
fosc
SYNCOSC
SYNCDTY
MAXDTY
MINDTY
I
PFM
EFFI
R
LxH
R
LxL
I
LIM1
I
LIM2
T
LAT
V
SHORT
T
SS
T
TSD
T
HYS
V
CEH
FB=V
FB
x 0.9, Voltage which Lx becomes
‘H’ after CE voltage changed from 0.4V to
1.2V (*8)
FB=V
FB
x 0.9, Voltage which Lx becomes
‘L’ after CE voltage changed from 1.2V to
0.4V (*8)
LIM=0V
LIM=V
IN
FB=V
FB
x 0.9, Short Lx by 1Ω resistance
FB Voltage which Lx becomes ‘L’ (*8)
CE=0V→V
IN
, I
OUT
=1mA
0.3
0.5
-
-
1.2
FB=V
FB
x 0.9
FB=V
FB
x 1.1
Connected to external components,
MODE/SYNC=0V, I
OUT
=10mA
Connected to external components,
V
IN
=5.0V, V
OUT
=3.3V, I
OUT
=200mA
FB=V
FB
x 0.9, I
Lx
=V
IN
-0.05V
FB=V
FB
x 0.9, V
IN
Voltage which Lx pin
voltage holding ‘L’ level (*8)
FB=V
FB
x 0.9, MODE/SYNC=0V
FB=V
FB
x 1.1 (Oscillation stops),
MODE/SYNC=0V
CE=0V
Connected to external components,
I
OUT
=10mA
Connected to external components,
I
OUT
=10mA, apply an external clock signal
to the MODE/SYNC
25
100
-
-
-
-
-
0.6
1.2
CONDITIONS
MIN.
2.5
0.784
0.9
0.4
1.0
1.55
TYP.
-
0.800
-
-
-
1.80
D1-1 (*2)
D1-2 (*2)
D1-6 (*2)
D1-3 (*2)
D1-4 (*2)
-
-
-
200
95
0.21
0.23
-
-
D1-5 (*2)
0.4
1.0
150
20
-
0.5
2.0
-
-
-
75
-
0
250
-
0.3 (*7)
0.3 (*7)
0.9
2.0
MAX.
6.0
0.816
VIN
-
-
2.00
UNIT
V
V
V
A
A
V
μA
μA
μA
MHz
MHz
%
%
%
mA
%
Ω
Ω
A
A
ms
V
ms
O
Topr=25℃
CIRCUIT
-
①
③
③
③
①
②
②
②
③
④
④
①
①
③
③
①
-
①
①
①
①
①
-
-
①
①
③
③
①
①
⑤
⑤
⑤
⑤
⑤
⑤
⑤
⑤
⑥
⑥
C
C
O
V
CE ‘L’ Voltage
MODE/SYNC ‘H’ Voltage
MODE/SYNC ‘L’ Voltage
LIM ‘H’ Voltage
LIM ‘L’ Voltage
CE ‘H’ Current
CE ‘L’ Current
MODE/SYNC ‘H’ Current
MODE/SYNC ‘L’ Current
LIM ‘H’ Current
LIM ‘L’ Current
FB ‘H’ Current
FB ‘L’ Current
Lx SW ‘H’ Leak Current
Lx SW ‘L’ Leak Current (*6)
V
CEL
V
MODE/SYNCH
V
MODE/SYNCL
V
LIMH
V
LIML
I
CEH
I
CEL
I
MODE/SYNCH
I
MODE/SYNCL
I
LIMH
I
LIML
I
FBH
I
FBL
I
LeakH
I
LeakL
-
1.2
-
1.2
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
0.4
-
0.4
-
0.4
0.1
-
0.1
-
0.1
-
0.1
-
1.0
-
V
V
V
V
V
A
μA
μA
μA
μA
μA
μA
μA
μA
μA
I
OUT
=I
LIM1
x 1.1, Check LIM voltage which
Lx oscillated after CE voltage changed
from 1.2V to 0.4V
V
IN
=CE=6.0V
V
IN
=6.0V, CE=0V
V
IN
=6.0V
V
IN
=6.0V, MODE/SYNC=0V
V
IN
=LIM=6.0V
V
IN
=6.0V, LIM=0V
V
IN
=FB=6.0V
V
IN
=6.0V, FB=0V
V
IN
=Lx=6.0V, CE=0V
V
IN
=6.0V, Lx=CE=0V
-
-
- 0.1
-
- 0.1
-
- 0.1
-
- 0.1
-
- 3.0
5/25
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