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PDF XC9502 Data sheet ( Hoja de datos )
| Número de pieza | XC9502 | |
| Descripción | 2ch. Step-up / down DC/DC Controller ICs | |
| Fabricantes | Torex Semiconductor | |
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Hay una vista previa y un enlace de descarga de XC9502 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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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
:200kΩ
CL1
:47µFX2
CFB1
:62pF
Tr2:Nch
MOSFET
:XP161A1355P
RFB12
:75kΩ
VPW M1
VNE1
VIN
=2.0V
~3.0V
Tr2:Pch
MOSFET
XP162A12A6P
L2:22µH
CDRH5D28
CIN
:47µF
SD2
:MA2Q737
CFB2
:62pF
RFB21
:220kΩ
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
:220kΩ
1
1 page  
XC9502 Series
2ch. Step-up / down DC/DC Controller ICs
! Electrical Characteristics XC9502B093
Common Characteristics
PARAMETER
SYMBOL
CONDITIONS
Supply Voltage (note 1)
Max. Input Voltage
VDD
VIN
Output Voltage Range
(note 3)
VDD ≥ 2.0V, IOUT1, 2=1mA
VOUTSET VDD≠VOUT1
VIN ≥ 0.9V, IOUT1, 2=1mA
Supply Current 1
Supply Current 1-1
Supply Current 1-2
IDD1
IDD1-1
IDD1-2
VDD=VOUT1
FB1, 2=0V
EN1=3.0V, EN2=0V, FB1=0V
EN2=3.0V, EN1=0V, FB2=0V
Supply Current 1-3
Supply Current 1-4
Supply Current 2
IDD1-3
IDD1-4
IDD2
FB1=0V, FB2=1.0V
FB1=1.0V, FB2=0V
FB1, 2=1.0V
Stand-by Current
Switching Frequency
EN1,2 "High" Voltage
EN1,2 "Low" Voltage
ISTB
FOSC
VENH
VENL
Same as IDD1, EN1=EN2=0V
Same as IDD1
FB1,2=0V
FB1,2=0V
EN1,2 "High" Current
EN1,2 "Low" Current
PWM1,2 "High" Current
IENH FB1,2=3.0V
IENL EN1,2=0V, FB1,2=3.0V
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=300kHz)
MIN. TYP.
VOUT1
VOUT2
VOUT1
VOUT2
2.0
10.0
0.9
0.9
2.0
0.9
-
-
-
-
-
-
-
255
0.65
-
-
-
-
-
-
-
-
-
-
-
-
-
100
80
60
100
70
70
1.0
300
-
-
-
-
-
-
-
-
MAX.
10.0
-
-
VIN
10.0
VIN
190
150
120
190
150
150
3.0
345
-
0.20
0.50
-0.50
0.50
-0.50
0.50
-0.50
Ta=25OC
UNITS
TEST
CIRCUIT
V1
V1
V
V
1
V2
V
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)
Using Tr: 2SD1628,
VST1-1 IOUT1=1.0mA, RFB11=200kΩ, RFB12=75kΩ
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)
EFFI1
IOUT=130mA
N-ch MOSFET:XP161A1355P
- 85
Soft-Start Time1
TSS1 VOUT1 × 0.95V, EN1=0V→0.65V
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
Ω6
Ω6
V5
V5
Output 2 Characteristics
Step-down Controller
PARAMETER
SYMBOL
CONDITIONS
MIN. TYP.
FB2 Voltage
VFB2 VIN=3.0V, IOUT2=10mA
0.900 0.900
Minimum Operation Voltage VINmin
--
Maximum Duty Ratio2
MAXDTY2 Same as IDD1
100 -
Minimum Duty Ratio2
MINDTY2 Same as IDD2
--
PFM Duty Ratio2
PFMDTY2 No Load, VPWM2=0V
22 30
Efficiency2
Soft-Start Time2
EFFI2
TSS2
IOUT2=250mA
P-ch MOSFET : XP162A12A6P
VOUT2 × 0.95V, EN2=0V→0.65V
- 92
5.0 10.0
EXT2 "High" ON Resistance REXTBH2 EN2=0V, EXT2=VDD-0.4V
- 28
EXT2 "Low" ON Resistance REXTBL2 FB2=0V, EXT2=0.4V
- 22
PWM2 "High" Voltage
VPWMH2 No Load
0.7 -
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.
0.900
2.0
-
0
38
-
20.0
47
30
-
0.20
Ta=25OC
UNITS
TEST
CIRCUIT
V7
V1
%3
%3
%8
%8
mS 8
Ω6
Ω6
V8
V8
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
5
5 Page 
XC9502 Series
2ch. Step-up / down DC/DC Controller ICs
! NoteS on Use
1. Checking for Intermittent Oscillation
The XC9502 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-up ration is low (e.g., from 4.5V to 5.0V) or the step-down ratio is
high (e.g., from 10.0V to 1.0 V), the control mode remains in PFM setting in the whole load range, since the duty ratio under
continuous-duty condition is smaller than the PFM duty ratio of the XC9502 series. The output voltage's ripple voltage becomes
substantially high under heavy load conditions, with the XC9502 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 XC9502 series and peripheral components within the limits of their ratings.
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet XC9502.PDF ] | |
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