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XC9502 데이터시트 PDF




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부품번호 XC9502 기능
기능 2ch. Step-up / down DC/DC Controller ICs
제조업체 Torex Semiconductor
로고 Torex Semiconductor 로고


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XC9502 데이터시트, 핀배열, 회로
XC9502 Series
2ch. Step-up / down DC/DC Controller ICs
Mar, 14 2003 Ver. 2
" 2ch DC/DC Controller (Step-up + Step-down)
" Input Voltage Range 0.9V ~ 10.0V
" Output Voltage Externally Set-Up
" Switching Frequency 180kHz (±15%)
" Maximum Duty Cycle Step-up 80% (Typ.)
! Applications
# PDAs
# Palm Top Computers
# Portable Audio Systems
# Various Multi-Function Power Supplies
Step-down 100%
" PWM, PWM/PFM Switching Control
" High Efficiency
Step-up 85% (Typ.)
! Features
2ch DC/DC Controller
Step-down 92% (Typ.)
" Small MSOP-10 package
Output 1 : Step-up DC/DC Controller
Output 2 : Step-down DC/DC Controller
Power Supply Voltage Range : 2.0V ~ 10V
Output Voltage Range
! General Description
The XC9502 series are PWM controlled, PWM/PFM automatic
switching controlled, multi-functional, 2 channel step-up and
down DC/DC controller ICs. With 0.9V of standard voltage
supply internal, and using externally connected components,
the output 1 voltage (step-up DC/DC controller) can be set
freely within a range of 1.5V to 30V. Since the output 2 (step-
down DC/DC controller) has a built-in 0.9V reference voltage
(accuracy ±2%), 0.9V to 6.0V can be set using external
components. With a 180kHz frequency, the size of the
external components can be reduced. Switching frequencies
of 300kHz & 500kHz are also available as custom-designed
products.
The control of the XC9502 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 1 (Step-up) : 1.5V ~ 30.0V
Can be set freely with 0.9V
(±2.0%) of reference voltage supply
and external components.
Output 2 (Step-down) : 0.9V ~ 6.0V
Can be set freely with 0.9V
(±2.0%) of reference voltage supply
and external components.
Oscillation Frequency
: 180kHz
±15%
(300kHz, 500kHz custom)
Output Current Output 1 : more than 300mA (VIN=1.8V, VOUT=3.3V)
Output 2 : more than 1000mA (VIN=3.3V, VOUT=1.8V)
Stand-By Function
: 3.0µA (MAX.)
Package
: MSOP-10
Soft-Start Time
: 10 ms (internally set)
! Typical Performance Characteristics
XC9502B093A (300kHz,VOUT1:3.3V,VOUT2:1.8V)
L1=15µH,L2=22µH(CDRH5D28),CL1,CL2=92µF(Tantalum)
SD1,SD2:CMS02, Tr1:XP161A1355P,Tr2:XP162A12A6P
Noise is easily reduced with PWM control since the frequency
is fixed. The series gives freedom of control selection so that
control suited to the application can be selected. Soft-start
time is internally set to 10msec (Output 1) and offers protection
against in-rush currents when the power is switched. This also
prevents voltage overshoot.
100
90
80
70
60
50
40
PWM/PFM Switching Control
VOUT1:3.3V
VOUT2:1.8V
30
! Typical Application Circuit
XC9502B092A Input :
2 cell, VOUT1 : 3.3V, VOUT2 : 1.8V
20
10
0
0.1
PWM Control
VIN=2.7V
1 10 100
Output Current 1,2 IOUT1,2 (mA)
1000
VOUT1:3.3V
SD1
:MA2Q737
L1:22µH
CDRH5D28
RFB11
:200k
CL1
:47µFX2
CFB1
:62pF
Tr2:Nch
MOSFET
:XP161A1355P
RFB12
:75k
VPW M1
VNE1
VIN
=2.0V
~3.0V
Tr2:Pch
MOSFET
XP162A12A6P
L2:22µH
CDRH5D28
CIN
:47µF
SD2
:MA2Q737
CFB2
:62pF
RFB21
:220k
VOUT2:1.8V
1 EXT1 EXT2/ 10
2 VDD GND 9
3 FB1
FB2 8
4 PW M1 PW M2 7
5 EN1
EN2 6
VPW M2
VNE2
CL2
:47µFX2
RFB22
:220k
1




XC9502 pdf, 반도체, 판매, 대치품
XC9502 Series
2ch. Step-up / down DC/DC Controller ICs
! Electrical Characteristics
Common Characteristics
XC9502B092
PARAMETER
SYMBOL
CONDITIONS
Supply Voltage (note 1)
VDD
Max. Input Voltage
VIN
Output Voltage Range
(note 3)
VDD 2.0V, IOUT1, 2=1mA
VOUTSET VDDVOUT1
VIN 0.9V, IOUT1, 2=1mA
Supply Current 1
VDD=VOUT1
IDD1 FB1, 2=0V
Supply Current 1-1
IDD1-1 EN1=3.0V, EN2=0V, FB1=0V
Supply Current 1-2
IDD1-2 EN2=3.0V, EN1=0V, FB2=0V
Supply Current 1-3
IDD1-3 FB1=0V, FB2=1.0V
Supply Current 1-4
IDD1-4 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
(FOSC=180kHz)
MIN. TYP.
VOUT1
VOUT2
VOUT1
VOUT2
2.0
10.0
0.9
0.9
2.0
0.9
-
-
-
-
-
-
-
153
0.65
-
-
-
-
-
-
-
-
-
-
-
-
-
70
60
50
70
60
60
1.0
180
-
-
-
-
-
-
-
-
MAX.
10.0
-
-
VIN
10.0
VIN
160
120
110
160
130
130
3.0
207
-
0.20
0.50
-0.50
0.50
-0.50
0.50
-0.50
Ta=25OC
UNITS
TEST
CIRCUIT
V1
V1
V
V
1
V
V
2
µA 3
µA 3
µA 3
µA 3
µA 3
µA 3
µA 3
kHz 3
V3
V3
µA 3
µA 3
µA 3
µA 3
µA 3
µA 3
Output 1 Characteristics
Step-up Controller
PARAMETER
SYMBOL
CONDITIONS
MIN. TYP.
FB1 Voltage
VFB1 VDD=3.0V, VIN=1.5V, IOUT1=10mA
0.882 0.900
Operation Start-up Voltage1
(note 2)
VST1-1
Using Tr: 2SD1628,
IOUT1=1.0mA, RFB11=200k, RFB12=75k
VDD VOUT1: IOUT1=1mA
--
--
Oscillation Start-up Voltage1 VST2-1 FB1=0V
--
Maximum Duty Ratio1
MAXDTY1 Same as IDD1
75 80
Minimum Duty Ratio1
MINDTY1 Same as IDD2
--
PFM Duty Ratio1
PFMDTY1 No Load, VPWM1=0V
22 30
Efficiency1 (note 4)
Soft-Start Time1
EFFI1
TSS1
IOUT=130mA
N-ch MOSFET:XP161A1355P
VOUT1 × 0.95V, EN1=0V0.65V
- 85
5.0 10.0
EXT1 "High" ON Resistance REXTBH1 FB1=0, EXT1=VDD-0.4V
- 28
EXT1 "Low" ON Resistance REXTBL1 EN1=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, EN2=PWM2=GND, EXT2=OPEN, FB2=OPEN, VIN=1.8V
MAX.
0.918
0.9
2.0
0.8
85
0
38
-
20.0
47
30
-
0.20
Ta=25OC
UNITS
TEST
CIRCUIT
V4
V2
V1
V3
%3
%3
%5
%5
mS 5
6
6
V5
V5
Output 2 Characteristics
Step-down Controller
Ta=25OC
PARAMETER
SYMBOL
CONDITIONS
MIN.
TYP.
MAX. UNITS
TEST
CIRCUIT
FB2 Voltage
Minimum Operation Voltage
VFB2 VIN=3.0V, IOUT2=10mA
VINmin
0.882 0.900 0.918
- - 2.0
V
V
7
1
Maximum Duty Ratio2
MAXDTY2 Same as IDD1
100 -
-%
3
Minimum Duty Ratio2
PFM Duty Ratio2
MINDTY2 Same as IDD2
PFMDTY2 No Load, VPWM2=0V
- - 0%
22 30 38 %
3
8
Efficiency2 (note 4)
EFFI2
IOUT2=250mA
P-ch MOSFET : XP162A12A6P
- 92 - %
8
Soft-Start Time2
TSS2 VOUT2 × 0.95V, EN2=0V0.65V
5.0 10.0 20.0 mS
8
EXT2 "High" ON Resistance REXTBH2 EN2=0, EXT2=VDD-0.4V
- 28 47
6
EXT2 "Low" ON Resistance REXTBL2 FB2=0V, EXT2=0.4V
- 22 30
6
PWM2 "High" Voltage
VPWMH2 No Load
0.65 -
-V
8
PWM2 "Low" Voltage
VPWML2 No Load
- - 0.20 V
8
Unless otherwise stated, VDD=EN2=PWM2=3.0V, PWM1=EN1=GND, EXT1=OPEN, FB1=OPEN, VIN=5.0V
Notes 1) Although the IC's step-up operations start from a VDD of 0.8V, the output voltage and switching frequency are stabilized at VDD
2.0V. Therefore, a VDD of more than 2.0V is recommended when VDD is supplied from VIN or other power sources.
2) Although the IC's switching operations start from a VIN of 0.9V, the IC's power supply pin (VDD) and output voltage monitor pin
(FB1) should be connected to VOUT1. With operations from VIN=0.9V, the 2nd channel's (output 2) EN2 pin should be set to chip
disable. Once ouput voltage VOUT1 is more than 2.0V, the EN2 pin should be set to chip enable.
3) Please be careful not to exceed the breakdown voltage level of the peripheral parts.
4) EFFI={ [ (Output voltage) x (Output current) ] / [ (Input voltage) x (Input Current) ] } x 100
4

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XC9502 전자부품, 판매, 대치품
XC9502 Series
2ch. Step-up / down DC/DC Controller ICs
! Operational Description
The XC9502 series are multi-functional, 2 channel step-up and down DC/DC converter controller ICs with built-in high speed, low
ON resistance drivers.
<Error Amp>
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 the notes on 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 EXT1 pin will be kept at a low level (the external N-type MOSFET
will be OFF) and the EXT2 pin will be kept at a high level (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.
Although IC starts oscillation from a VIN of 0.9V, the IC's power supply pin (VDD) and the output voltage monitor pin (FB1) should
be connected to VOUT1. The start-up sequence for EN1 and EN2 is required when operations begin with a power supply voltage
of VDD=0.9V, and channel two's (output 2) EN2 pin should be set to chip disable and turn it to enable when VOUT1 is more than
2.0V.
For power supply voltages of VDD<2.0V, oscillation may occur irrespective of the FB pin voltage. Should this happen, you may
find that output voltage will be higher than the set voltage. The FB pin voltage and the reference voltage Vref will be compared
and output voltage will be controlled when the power supply voltage is V DD>2.0V or more. With power supply voltages of
VDD>2.0V, the start-up sequence for EN1 and EN2 will not be required.
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