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Número de pieza | XC9223 | |
Descripción | (XC9223 / XC9224) 1A Driver Transistor Built-In Step-Down DC/DC Converters | |
Fabricantes | Torex Semiconductor | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de XC9223 (archivo pdf) en la parte inferior de esta página. Total 25 Páginas | ||
No Preview Available ! XC9223/XC9224 Series
1A Driver Transistor Built-In Step-Down DC/DC Converters
ETR0509_007
www.datasheet4u.com
GENERAL DESCRIPTION
GreenOperation-Compatible
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 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 XC9223B/XC9224B series’ detector function monitors the discretional voltage by external resistors.
APPLICATIONS
HDD
Notebook computers
CD-R / RW, DVD
PDAs, Portable communication modems
Digital cameras, Video recorders
Various general-purpose power supplies
FEATURES
Input Voltage Range
Output Voltage Range
Oscillation Frequency
Output Current
: 2.5V ~ 6.0V
: 0.9V ~ VIN (set by FB pin)
: 1MHz, 2MHz (+15% accuracy)
: 1.0A
Maximum Current
Limit
: 0.6A (MIN.) ~ 0.9A (MAX)
with LIM pin=’L’
: 1.2A (MIN.) ~ 2.0A (MAX.)
with LIM pin=’H’
Controls
Protection Circuits
: PWM/PFM or PWM by MODE pin
: Thermal shutdown
Integral latch method
Short-circuit protection
Soft-Start Time
Voltage Detector
: 1ms (TYP.) internally set
: B type (with VD function)
Built-in P-channel
MOSFET
D type (without VD function)
: 0.21
Built-in Synchronous : 0.23
N-channel MOSFET
(No Schottky Barrier Diode Required)
High Efficiency
: 95% (VIN=5.0V, VOUT=3.3V)
Synchronized with an External Clock Signal
Ceramic Capacitor Compatible
Packages
: MSOP-10, USP-10B, SOP-8
* SOP-8 package is available for the XC9223D type only.
TYPICAL APPLICATION CIRCUIT
TYPICAL PERFORMANCE
CHARACTERISTICS
Efficiency vs. Output Current
(*1) A capacitor of 2200pF~0.1μF is recommended to place at the CDD between the AGND
pin and the VIN pin.
Please refer to the page showing INSTRUCTION ON PATTERN LAYOUT for more detail.
100
L=4.7
XXCC99222233BB008811AAxx
VIN=5V, FOSC=1MHz,
H (CVDINR=H54VD,2F8OC)S, CC=IN1=M1H0z, FL=(c4e.7raumHi(cC),DCRLH=41D028FC)(,ceramic)
CIN=10 uF(ceram i c), CL=1 0uF(cera m i c)
90
80
70
60 VOUT=3.3V
50
40 VOUT=1.5V
30
20 PW M/PFM
10 PW M
0
1 10 100 1000
Output Current: IOUT (mA)
1/25
1 page ABSOLUTE MAXIMUM RATINGS
PARAMETER
VIN Pin Voltage
www.datasheet4u.com
VDIN Pin Voltage
VDOUT Pin Voltage
VDOUT Pin Current
FB Pin Voltage
LIM Pin Voltage
MODE/SYNC Pin Voltage
CE Pin Voltage
Lx Pin Voltage
Lx Pin Current
MSOP-10
Power Dissipation USP-10B
SOP-8
Operating Temperature Range
Storage Temperature Range
*1: When implemented on a PCB.
SYMBOL
VIN
VDIN
VDOUT
IDOUT
VFB
VLIM
VMODE/SYNC
VCE
VLx
ILx
Pd
Topr
Tstg
XC9223/XC9224
Series
RATINGS
- 0.3 ~ 6.5
- 0.3 ~ 6.5
- 0.3 ~ 6.5
10
- 0.3 ~ 6.5
- 0.3 ~ 6.5
- 0.3 ~ 6.5
- 0.3 ~ 6.5
- 0.3 ~ VDD + 0.3
2000
350 (*1)
150
300
- 40 ~ + 85
- 55 ~ +125
Ta=25OC
UNITS
V
V
V
mA
V
V
V
V
V
mA
mW
5/25
5 Page XC9223/XC9224
Series
OPERATIONAL EXPLANATION (Continued)
<PFM Switch Current>
In PFM control operation, until coil current reaches to a specified level (IPFM), the IC keeps the P-ch MOSFET on.
www.datitmasehteheat4t uth.ceomP-ch MOSFET is kept on (TON) can be given by the following formula.
TON= L IPFM (VIN VOUT)
IPFM
In this case,
<Maximum IPFM Limit>
In PFM control operation, the maximum duty cycle (MAXPFM) is set to 50% (TYP.). Therefore, under the condition that the
duty increases (e.g. the condition that the step-down ratio is small), it’s possible for P-ch MOSFET to be turned off even when
coil current doesn’t reach to IPFM.
IPFM
IPFM
Ton
Lx
I Lx
IPFM
0mA
IPFM
FOSC
M axum um IPFM Current
Lx
IPFM
I Lx
0mA
11/25
11 Page |
Páginas | Total 25 Páginas | |
PDF Descargar | [ Datasheet XC9223.PDF ] |
Número de pieza | Descripción | Fabricantes |
XC9220 | (XC9220 / XC9221) Step-Down DC/DC Controller ICs | Torex Semiconductor |
XC9221 | (XC9220 / XC9221) Step-Down DC/DC Controller ICs | Torex Semiconductor |
XC9223 | (XC9223 / XC9224) 1A Driver Transistor Built-In Step-Down DC/DC Converters | Torex Semiconductor |
XC9224 | (XC9223 / XC9224) 1A Driver Transistor Built-In Step-Down DC/DC Converters | Torex Semiconductor |
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