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XC9503 데이터시트 PDF




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부품번호 XC9503 기능
기능 2ch Step-down DC/DC Controller ICs
제조업체 Torex Semiconductor
로고 Torex Semiconductor 로고


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XC9503 데이터시트, 핀배열, 회로
XC9503 Series
2ch. Step-down DC/DC Controller ICs
Mar. 14, 2003 Ver. 2
‹ 2ch DC/DC Controller (Step-down + Step-down)
‹ Input Voltage Range 2.0V ~ 10.0V
‹ Output Voltage Externally Set-Up
‹ Switching Frequency 300kHz (±15%)
‹ Maximum Duty Cycle 100%
‹ PWM, PWM/PFM Switching Control
‹ High Efficiency
Step-down 92% (Typ.)
‹ Small MSOP-10 package
„ Applications
z PDAs
z Palm Top Computers
z Digital Cameras
z Various Multi-Function Power Supplies
„ Features
Input Voltage Range
: 2.0V ~ 10V
Power Supply Voltage Range : 2.0V ~ 10V
„ General Description
The XC9503 series are PWM controlled, PWM/PFM automatic
switching controlled, multi-functional, 2 channel step-down
DC/DC controller ICs. Since the series has a built-in 0.9V
reference voltage (accuracy ±2%), 0.9V to 6.0V can be set
using external components. With a 300kHz frequency, the size
of the external components can be reduced. Switching
frequencies of 180kHz & 500kHz are also available as custom-
designed products.
The control of the XC9503 series can be switched between
PWM control and PWM/PFM automatic switching control using
external signals. Control switches from PWM to PFM during
light loads when automatic switching is selected and the series
is highly efficient from light loads through to large output
currents.
Output Voltage Range
Oscillation Frequency
Output Current
Stand-By Function
Package
Soft-Start Time
: 0.9V ~ 6.0V
Can be set freely with 0.9V
(±2.0%) of reference
voltage supply and
external components.
: 300kHz
±15%
(180kHz, 500kHz custom)
: more than 1000mA (VIN=5.0V, VOUT=3.3V)
: 3.0µA (MAX.)
: MSOP-10
: 10 ms (internally set)
„ Typical Performance Characteristics
XC9503B093A (300kHz,VOUT1:3.3V)
Noise is easily reduced with PWM control since the frequency
is fixed. The series gives freedom to select control suited to
the application. Soft-start time is internally set to 10msec and
offers protection against in-rush currents when the power is
switched on and also protects against voltage overshoot.
100
90
L1=22µH(CDRH5D28), CL1=47µF(Tantalum)
SD1:MA2Q737, Tr1:XP162A1355P
PWM/PFM Switching
80
70
60 VIN=5.0V
50
40
30
20
„ Typical Application Circuit
XC9503B093A Input :
VOUT1 : 3.3V, VOUT2 : 1.8V
10
0
0.1
PWM
1 10 100
Output Current 1 IOUT1(mA)
1000
VOUT1:3.3V
L1:22µH
CDRH5D28
Tr1:Pch MOSFET
XP162A12A6P
SD1
:MA2Q737
RFB11
:200k
CFB1
:62pF
VIN
=5.0V
Tr2:Pch MOSFET
XP162A12A6P
L2:22µH
CDRH5D28
CIN
:47µF
SD2
:MA2Q737
VOUT2:1.8V
CFB2
:62pF
RFB21
:220k
CL1:
47µFX2
RFB12
:75k
VPWM1
VEN1
1 EXT1/ EXT2/ 10
2 VDD
GND 9
3 FB1
FB2 8
4 PWM1 PWM2 7
5 EN1
EN2 6
VPW M2
VEN2
CL2:
47µFX2
RFB22
:220k
1




XC9503 pdf, 반도체, 판매, 대치품
XC9503 Series
2ch. Step-down DC/DC Controller ICs
„ Electrical Characteristics
XC9503B092A
Common Characteristics
PARAMETER
SYMBOL
CONDITIONS
Supply Voltage
Max. Input Voltage
Output Voltage Range
(note 1)
VDD
VIN
VOUTSET VIN 2.0V, IOUT1, 2=1mA
Supply Current 1
IDD1 FB1, 2=0V
Supply Current 1-1
IDD1-1 EN1=3.0V, EN2=0V, FB1=0V
EN2=3.0V, EN1=0V, FB2=0V
Supply Current 1-2
IDD1-2 FB1=0V, FB2=1.0V
FB1=1.0V, FB2=0V
Supply Current 2
IDD2 FB1, 2=1.0V
Stand-by Current
ISTB Same as IDD1, EN1=EN2=0V
Switching Frequency
FOSC Same as IDD1
EN1,2 "High" Voltage
VENH FB1,2=0V
EN1,2 "Low" Voltage
VENL FB1,2=0V
EN1,2 "High" Current
IENH EN1,2=3.0V
EN1,2 "Low" Current
IENL EN1,2=0V, FB1,2=3.0V
PWM1,2 "High" Current
IPWMH FB1, 2=3.0V, PWM=3.0V
PWM1,2 "Low" Current
IPWML FB1, 2=3.0V, PWM=0V
FB1,2 "High" Current
IFBH FB1, 2=3.0V
FB1,2 "Low" Current
VFBL FB1, 2=1.0V
Unless otherwise stated, VDD=3.0V, PWM1,2=3.0V, EN1, 2 =3.0V
MIN.
VOUT1
VOUT2
2.0
10.0
0.9
0.9
-
-
TYP.
-
-
-
-
60
50
MAX.
10.0
-
10.0
10.0
120
Ta=25OC
UNITS
TEST
CIRCUIT
V1
V1
V1
V
µA 2
110 µA
2
- 60 130 µA
- 60 140 µA
-
1.0 3.0
µA
153 180 207 kHz
0.65 -
-V
- - 0.20 V
- - 0.50 µA
- - -0.50 µA
- - 0.50 µA
- - -0.50 µA
- - 0.50 µA
- - -0.50 µA
2
2
2
2
2
2
2
2
2
2
2
2
Output 1 Characteristics
PARAMETER
SYMBOL
Step-down Controller
CONDITIONS
MIN. TYP.
FB1 Voltage
VFB1 VIN=3.0V, IOUT1=10mA
0.882 0.900
Minimum Operation Voltage VINmin1
--
Maximum Duty Ratio 1 MAXDTY1 Same as IDD1
100 -
Minimum Duty Ratio1
MINDTY1 Same as IDD2
--
PFM Duty Ratio 1
PFMDTY1 No Load, VPWM1=0V
22 30
Efficiency1 (note 2)
EFFI1 IOUT1=250mA
P-ch MOSFET : XP162A12A6P
- 92
Soft-Start Time1
TSS1 VOUT1 × 0.95V, EN1=0V0.65V
5.0 10.0
EXT1 "High" ON Resistance REXTBH1 EN1=0, EXT1=VDD-0.4V
- 28
EXT1 "Low" ON Resistance REXTBL1 FB2=0V, EXT1=0.4V
- 22
PWM1 "High" Voltage
VPWMH1 No Load
0.65 -
PWM1 "Low" Voltage
VPWML1 No Load
--
Unless otherwise stated, VDD=EN1=PWM1=3.0V, PWM2=EN2=GND, EXT2=OPEN, FB2=OPEN, VIN=5.0V
MAX. UNITS
0.918
2.0
-
0
38
V
V
%
%
%
-%
20.0
47
30
-
0.20
mS
V
V
TEST
CIRCUIT
3
1
2
2
4
4
4
5
5
4
4
Output 2 Characteristics
PARAMETER
SYMBOL
Step-down Controller
CONDITIONS
MIN. TYP.
FB2 Voltage
VFB2 VIN=3.0V, IOUT2=10mA
0.882 0.900
Minimum Operation Voltage VINmin2
--
Maximum Duty Ratio 2 MAXDTY2 Same as IDD1
100 -
Minimum Duty Ratio 2
MINDTY2 Same as IDD2
--
PFM Duty Ratio 2
PFMDTY2 No Load, VPWM2=0V
22 30
Efficiency2 (note 2)
EFFI2 IOUT2=250mA
P-ch MOSFET : XP162A12A6P
- 92
Soft-Start Time 2
TSS2 VOUT2 × 0.95V, EN2=0V0.65V
5.0 10.0
EXT2 "High" ON Resistance REXTBH2 EN2=0, EXT2=VDD-0.4V
- 28
EXT2 "Low" ON Resistance REXTBL2 FB2=0V, EXT2=0.4V
- 22
PWM2 "High" Voltage
VPWMH2 No Load
0.65 -
PWM2 "Low" Voltage
VPWML2 No Load
--
Unless otherwise stated, VDD=EN2=PWM2=3.0V, PWM1=EN1=GND, EXT1=OPEN, FB1=OPEN, VIN=5.0V
MAX. UNITS
0.918
2.0
-
0
38
V
V
%
%
%
-%
20.0
47
30
-
0.20
mS
V
V
TEST
CIRCUIT
6
1
2
2
7
7
7
5
5
7
7
Notes 1) Please be careful not to exceed the breakdown voltage level of the peripheral parts.
2) EFFI={ [ (Output voltage) x (Output current) ] / [ (Input voltage) x (Input Current) ] } x 100
4

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XC9503 전자부품, 판매, 대치품
XC9503 Series
2ch. Step-down DC/DC Controller ICs
„ Operational Description
The XC9503 series are multi-functional, 2 channel step-down DC/DC converter controller ICs with built-in high speed, low ON
resistance drivers.
<Error Amp 1, 2>
The Error Amplifier is designed to monitor the output voltage and it compares the feedback voltage (FB) with the reference
voltage. In response to feedback of a voltage lower than the reference voltage, the output voltage of the error amp. decreases.
<OSC Generator>
This circuit generates the Switching Frequency which in turn generates the reference clock.
<Ramp Wave Generator 1, 2>
The Ramp Wave Generator generates a saw-tooth waveform based on outputs from the Phase Shift Generator.
<PWM Comparator 1, 2>
The PWM Comparator compares outputs from the Error Amp. and saw-tooth waveform. When the voltage from the Error Amp's
output is low, the external switch will be set to ON.
<PWM/PFM Controller 1, 2>
This circuit generates PFM pulses.
Control can be switched between PWM control and PWM/PFM automatic switching control using external signals.
The PWM/PFM automatic switching mode is selected when the voltage of the PWM1 (2) pin is less than 0.2V, and the control
switches between PWM and PFM automatically depending on the load. As the PFM circuit generates pulses based on outputs
from the PWM comparator, shifting between modes occurs smoothly. PWM control mode is selected when the voltage of the
PWM1 (2) pin is more than 0.65V. Noise is easily reduced with PWM control since the switching frequency is fixed.
Control suited to the application can easily be selected which is useful in audio applications, for example, where traditionally,
efficiencies have been sacrificed during stand-by as a result of using PWM control (due to the noise problems associated with
the PFM mode in stand-by).
<Vref with Soft Start 1, 2>
The reference voltage, Vref (FB pin voltage)=0.9V, is adjusted and fixed by laser trimming (for output voltage settings, please
refer to page 8). To protect against inrush current, when the power is switched on, and also to protect against voltage overshoot,
soft-start time is set internally to 10ms. It should be noted, however, that this circuit does not protect the load capacitor (CL) from
inrush current. With the Vref voltage limited and depending upon the input to the error amps, the operation maintains a balance
between the two inputs of the error amps and controls the EXT pin's ON time so that it doesn't increase more than is necessary.
<Chip Enable Function>
This function controls the operation and shutdown of the IC. When the voltage of the EN1 or EN2 pins is 0.2V or less, the mode
will be chip disable, the channel's operations will stop and the EXT pins will be kept at a highlevel (the external P-type MOSFET
will be OFF). When both EN1 and EN2 are in a state of chip disable, current consumption will be no more than 3.0 µA.
When the EN1 or EN2 pin's voltage is 0.65V or more, the mode will be chip enable and operations will recommence. With soft-
start, 95% of the set output voltage will be reached within 10mS (TYP) from the moment of chip enable.
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