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XC9223B082DR データシート(PDF) 1 Page - Torex Semiconductor

部品番号 XC9223B082DR
部品情報  1A Driver Transistor Built-In Step-Down DC/DC Converters
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メーカー  TOREX [Torex Semiconductor]
ホームページ  http://www.torex.co.jp
Logo TOREX - Torex Semiconductor

XC9223B082DR データシート(HTML) 1 Page - Torex Semiconductor

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Data Sheet
1
DC000019
XC9223/9224 Series
1A Driver Transistor Built-In Step-Down DC/DC Converters
Preliminary
October 7, 2004 V2
Green Operation Compatible
APPLICATIONS
Step-Down DC/DC Converters
HDD
Built-in P-channel MOSFET
: 0.23
Notebook computers
Built-in Synchronous N-channel MOSFET
: 0.25
CD-R / RW, DVD
(No Schottky Barrier Diode Required)
PDAs, Portable communication modems
High Efficiency
: 94% (VIN=5.0V, VOUT=3.3V)
Digital cameras, Video recorders
Oscillation Frequency:
: 1.0MHz, 2.0MHz
(Small Inductor for High Frequency Selectable)
Various general-purpose power supplies
Synchronized with an External Clock Signal
Ceramic Capacitor Compatible
MSOP-10 / USP-10 Packages
GENERAL DESCRIPTION
FEATURES
Input Voltage Range
: 2.2V ~ 6.0V
Output Voltage Range
: 0.8V ~ VIN
Can be set freely with 0.8V (+2%) of
reference voltage by the external resistors.
Oscillation Frequency
: 1MHz, 2MHz ( ± 15% accuracy)
Output Current
: 1.0A
Maximum Current Limit
: 0.5A (MIN.) when LIM pin=’L’
: 1.5A (MIN.) when LIM pin=’H’
Controls
: PWM/PFM externally switching
: Synchronized with an external clock signal
Protection Circuits
: Thermal shutdown
: Integral latch method (over current limit)
Soft-Start Time
: Short-circuit protection
: 3mS (TYP.) internally set
Voltage Detector
: 0.712V detect, N-ch open drain output
The XC9223/9224 series are synchronous step-down DC/DC converters
with a 0.23
Ω (TYP.) P-channel driver transistor and a synchronous
0.25
Ω (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 XC9223/9224 series are ideally suited to
applications with height limitation such as HDD or space-saving
applications.
Current limit value can be chosen either 1.5A (MIN.) when the LIM pin is
high level, or 0.5A (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 XC9223/9224 series provide mode selection of
the fixed PWM control or automatically switching current limit PFM/PWM
control. As for preventing unwanted switching noise, the XC9223/9224
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 XC9223/9224 series build
in three protection functions: integral latch protection, thermal shutdown,
and short-circuit protection.
With the built-in U.V.L.O. (Under Voltage Lock Out) function, the internal
P-channel driver transistor is forced OFF when input voltage becomes
1.8V or lower.
The series’ detector function monitors the discretional voltage by external
resistors.
TYPICAL APPLICATION CIRCUIT
TYPICAL PERFOMANCE CHARACTERICSTICS
Efficiency vs. Output Current
VIN=5.0V, FOSC=2.0MHz
L=2.0
µH(CDRH4D28C), CIN=10µF(ceramic), CL=10µF(ceramic)
0
10
20
30
40
50
60
70
80
90
100
1
10
100
1000
10000
VOUT=3.3V
VOUT=1.5V
Output Current:
IOUT (mA)
VIN
PGND
AGND
LX
FB
MODE/
SYNC
CE
VDIN
VDOUT
LIM
L
RFB1
RFB2
CL
1
3
5
2
4
10
8
6
9
7
CIN
CFB
CE
MODE/SYNC
LIM
VDOUT
VDIN
VIN
(ceramic)
VOUT


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