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PDF XC9503 Data sheet ( Hoja de datos )
| Número de pieza | XC9503 | |
| Descripción | 2ch Step-down DC/DC Controller ICs | |
| Fabricantes | Torex Semiconductor | |
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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
:200kΩ
CFB1
:62pF
VIN
=5.0V
Tr2:Pch MOSFET
XP162A12A6P
L2:22µH
CDRH5D28
CIN
:47µF
SD2
:MA2Q737
VOUT2:1.8V
CFB2
:62pF
RFB21
:220kΩ
CL1:
47µFX2
RFB12
:75kΩ
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
:220kΩ
1
1 page  
XC9503 Series
2ch. Step-down DC/DC Controller ICs
Electrical Characteristics
XC9503B093A
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.
-
-
-
-
70
60
MAX.
10.0
-
10.0
10.0
140
Ta=25OC
UNITS
TEST
CIRCUIT
V1
V1
V1
V
µA 2
120 µA
2
- 70 150 µA
- 80 150 µA
-
1.0 3.0
µA
255 300 345 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=0V→0.65V
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
Ω
Ω
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=0V→0.65V
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
Ω
Ω
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
5
5 Page 
XC9503 Series
2ch. Step-down DC/DC Controller ICs
Notes on Use
1. Checking for Intermittent Oscillation
The XC9503 series is subject to intermittent oscillation in the proximity of the maximum duty if the step-down ratio is low (e.g.,
from 4.2 V to 3.3 V) or a heavy load is applied where the duty ratio becomes high. Check waveforms at EXT under your
operating conditions. A remedy for this problem is to raise the inductance of coil L or increase the load capacitance CL.
2. PWM/PFM Automatic Switching
If PWM/PFM automatic switching control is selected and the step-down ratio is high (e.g., from 10 V to 1.0 V), the control mode
remains in PFM setting over the whole load range, since the duty ratio under continuous-duty condition is smaller than the PFM
duty ratio of the XC9503 series. The output voltage's ripple voltage becomes substantially high under heavy load conditions, with
the XC9503 series appearing to be producing an abnormal oscillation. If this operation becomes a concern, set pins PWM1 and
PWM2 to High to set the control mode to PWM setting. For use under the above-mentioned condition, measured data of
PWM/PFM automatic switching control shown on the data sheets are available up to IOUT = 100 mA.
3. Ratings
Use the XC9503 series and peripheral components within the limits of their ratings.
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet XC9503.PDF ] | |
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