XC9502 Series
"
2ch DC/DC Controller (Step-up + Step-down)
"
Input Voltage Range 0.9V ~ 10.0V
"
Output Voltage Externally Set-Up
"
Switching Frequency 180kHz (±15%)
Step-up
80% (Typ.)
Step-down 100%
"
PWM, PWM/PFM Switching Control
"
High Efficiency
Step-up
85% (Typ.)
Step-down 92% (Typ.)
"
Small MSOP-10 package
"
Maximum Duty Cycle
2ch. Step-up / down DC/DC Controller ICs
Mar, 14 2003 Ver. 2
!
Applications
#
PDAs
#
Palm Top Computers
#
Portable Audio Systems
#
Various Multi-Function Power Supplies
!
Features
2ch DC/DC Controller
Output 1 : Step-up DC/DC Controller
Output 2 : Step-down DC/DC Controller
Power Supply Voltage Range
: 2.0V ~ 10V
Output Voltage Range
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
Output Current
Stand-By Function
Package
Soft-Start Time
Output 1
Output 2
: 180kHz
±15%
!
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.
(300kHz, 500kHz custom)
: more than 300mA
(V
IN
=1.8V, V
OUT
=3.3V)
: more than 1000mA (VIN=3.3V, VOUT=1.8V)
: 3.0µA (MAX.)
: MSOP-10
: 10 ms (internally set)
!
Typical Performance Characteristics
XC9502B093A (300kHz,VOUT1:3.3V,VOUT2:1.8V)
L1=15µH,L2=22µH(CDRH5D28),C
L1,
C
L2
=92µF(Tantalum)
SD1,SD2:CMS02, Tr1:XP161A1355P,Tr2:XP162A12A6P
Efficiency 1,2 EFFI1,2 (%)
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.
!
Typical Application Circuit
XC9502B092A Input :
2 cell, VOUT1 : 3.3V, VOUT2 : 1.8V
V
OUT
1:3.3V
SD1
:MA2Q737
L1:22µH
CDRH5D28
Tr2:Pch
MOSFET
XP162A12A6P
100
90
80
70
60
50
40
30
20
10
0
PWM/PFM Switching Control
V
OUT1
:3.3V
V
OUT2
:1.8V
PWM Control
V
IN
=2.7V
0.1
1
10
100
1000
Output Current 1,2 I
OUT1,2
(mA)
L2:22µH
CDRH5D28
V
OUT
2:1.8V
SD2
:MA2Q737
RFB11
:200kΩ
CL1
:47µFX2
CFB1
:62pF
Tr2:Nch
MOSFET
:XP161A1355P
VIN
=2.0V
~3.0V
C
IN
:47µF
CFB2
:62pF
RFB21
:220kΩ
CL2
:47µFX2
1 EXT1 EXT2/ 10
2 VDD
3 FB1
GND 9
FB2 8
V
PW M1
RFB12
:75kΩ
V
NE1
4 PW M1 PW M2 7
5 EN1
EN2 6
V
PW M2
V
NE2
RFB22
:220kΩ
1
XC9502 Series
2ch. Step-up / down DC/DC Controller ICs
!
Pin Configuration
1 EXT1
2 VDD
3 FB1
4 PWM1
5 EN1
EXT2 10
GND 9
FB2 8
PWM2 7
EN2 6
MSOP-10
(TOP VIEW)
!
Pin Assignment
PIN NUMBER
1
2
3
4
5
6
7
8
9
10
PIN NAME
EXT 1
V
DD
FB1
PWM1
EN1
EN2
PWM2
FB2
GND
EXT2/
FUNCTIONS
Channel 1: External Transistor Drive Pin <Connected to Nch Power MOSFET Gate>
Supply Voltage
Channel 1 : Output Voltage Monitor Feedback Pin <Threshold value : 0.9V. Output voltage
can be set freely by connecting split resistors between VOUT1 and Ground.>
Channel 1 : PWM/PFM Switching Pin <Control Output 1. PWM control when connected to
V
DD
, PWM / PFM auto switching when connected to Ground. >
Channel 1 : Enable Pin <Connected to Ground when Output 1 is in stand-by mode.
Connected to VDD when Output 1 is active. EXT1 is low when in stand-by mode.>
Channel 2 : Enable Pin <Connected to Ground when Output 2 is in stand-by mode.
Connected to VDD when Output 2 is active. EXT2/ is high when in stand-by mode.>
Channel 2 : PWM/PFM Switching Pin <Control Output 2. PWM control when connected to
VDD, PWM / PFM auto switching when connected to Ground.>
Channel 2 : Output Voltage Monitor Feedback Pin <Threshold value : 0.9V. Output voltage
can be set freely by connecting split resistors between VOUT2 and Ground.>
Ground
Channel 2 : External Transistor Drive Pin <Connected to Pch Power MOSFET Gate>
!
Ordering Information
XC9502
123456
DESIGNATOR
SYMBOL
DESCRIPTION
Standard (10 Pin)
FB Voltage
0.9V
Switching Frequency
180kHz
300kHz (custom)
500kHz (custom)
Package
Embossed Tape
Embossed Tape
MSOP-10
Standard Feed
Reverse Feed
1
2
3
4
5
6
B
0
9
2
3
5
A
R
L
2
XC9502 Series
2ch. Step-up / down DC/DC Controller ICs
!
Absolute Maximum Ratings
Ta=25
O
C
PARAMETER
V
DD
Pin Voltage
FB1, 2 Pin Voltage
EN1, 2 Pin Voltage
PWM1,2 Pin Voltage
EXT1, 2 Pin Voltage
EXT1, 2 Pin Current
Power Dissipation
Operating Ambient Temperature
Storage Temperature
SYMBOL
V
DD
V
FB
V
EN
V
PWM
V
EXT
I
EXT
Pd
Topr
Tstg
RATINGS
- 0.3 ~ 12
- 0.3 ~ 12
- 0.3 ~ 12
- 0.3 ~ 12
- 0.3 ~ V
DD
+ 0.3
± 100
150
- 40 ~ + 85
- 55 ~ + 125
UNITS
V
V
V
V
V
mA
mW
O
O
C
C
* Voltage goes to Ground.
!
Block Diagram
EXT1
PWM/PFM
Controller 1
PWM/PFM
Controller 2
EXT2
VDD
PW
Comparator1
M
PWM
Comparator2
+
-
-
+
GND
FB1
+
-
Error
Amp1
Ramp Wave
Generator 1
Ramp Wave
Generator 2
+
-
Error
Amp2
FB2
PWM1
OSC
Generator
Vref1 = 0.9V
with Soft Start1,
EN1
EN1 to
internal circuit
Vref2 = 0.9V
with Soft Start 1,
EN2
PWM2
EN1
EN2
EN2 to
internal circuit
3
XC9502 Series
!
Electrical Characteristics
Common Characteristics
PARAMETER
Supply Voltage (note 1)
Max. Input Voltage
Output Voltage Range
(note 3)
SYMBOL
VDD
VIN
2ch. Step-up / down DC/DC Controller ICs
XC9502B092
(FOSC=180kHz)
CONDITIONS
MIN.
2.0
10.0
0.9
0.9
2.0
0.9
-
-
-
-
-
-
-
153
0.65
-
-
-
-
-
-
-
TYP.
-
-
-
-
-
-
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=25
O
C
UNITS
V
V
V
V
V
V
µA
µA
µA
µA
µA
µA
µA
kHz
V
V
µA
µA
µA
µA
µA
µA
TEST
CIRCUIT
1
1
1
2
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
3
VDD
≥
2.0V, IOUT1, 2=1mA
VOUTSET VDD≠VOUT1
VIN
≥
0.9V, IOUT1, 2=1mA
VDD=VOUT1
FB1, 2=0V
Supply Current 1
IDD1
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
FB1=1.0V, FB2=0V
IDD1-4
Supply Current 1-4
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
IFBH
FB1, 2=3.0V
FB1,2 "High" Current
FB1, 2=1.0V
FB1,2 "Low" Current
VFBL
Unless otherwise stated, VDD=3.0V, PWM1,2=3.0V, EN1, 2 =3.0V
Output 1 Characteristics
PARAMETER
FB1 Voltage
SYMBOL
VFB1
Step-up Controller
CONDITIONS
VOUT1
VOUT2
VOUT1
VOUT2
Ta=25
O
C
MIN.
TYP.
MAX.
0.918
0.9
2.0
0.8
85
0
38
-
20.0
47
30
-
0.20
UNITS
V
V
V
V
%
%
%
%
mS
Ω
Ω
V
V
TEST
CIRCUIT
0.882 0.900
VDD=3.0V, VIN=1.5V, IOUT1=10mA
Using Tr: 2SD1628,
-
-
Operation Start-up Voltage1
VST1-1 IOUT1=1.0mA, RFB11=200kΩ, RFB12=75kΩ
(note 2)
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
IOUT=130mA
Efficiency1 (note 4)
EFFI1
-
85
N-ch MOSFET:XP161A1355P
VOUT1
×
0.95V, EN1=0V→0.65V
Soft-Start Time1
TSS1
5.0
10.0
28
EXT1 "High" ON Resistance REXTBH1 FB1=0, EXT1=VDD-0.4V
-
EXT1 "Low" ON Resistance
REXTBL1 EN1=FB2=0V, EXT1=0.4V
-
22
0.65
PWM1 "High" Voltage
VPWMH1 No Load
-
-
-
PWM1 "Low" Voltage
VPWML1 No Load
Unless otherwise stated, VDD=EN1=PWM1=3.0V, EN2=PWM2=GND, EXT2=OPEN, FB2=OPEN, VIN=1.8V
Output 2 Characteristics
PARAMETER
FB2 Voltage
Minimum Operation Voltage
Maximum Duty Ratio2
Minimum Duty Ratio2
PFM Duty Ratio2
SYMBOL
VFB2
VINmin
MAXDTY2
MINDTY2
PFMDTY2
Step-down Controller
CONDITIONS
VIN=3.0V, IOUT2=10mA
MIN.
0.882
-
100
-
22
TYP.
0.900
-
-
-
30
4
2
1
3
3
3
5
5
5
6
6
5
5
Ta=25
O
C
MAX.
0.918
2.0
-
0
38
UNITS
V
V
%
%
%
TEST
CIRCUIT
Same as IDD1
Same as IDD2
No Load, VPWM2=0V
IOUT2=250mA
Efficiency2 (note 4)
EFFI2
-
92
-
%
8
P-ch MOSFET : XP162A12A6P
VOUT2
×
0.95V, EN2=0V→0.65V
Soft-Start Time2
8
10.0
TSS2
20.0
mS
5.0
28
47
6
-
EXT2 "High" ON Resistance REXTBH2 EN2=0, EXT2=VDD-0.4V
Ω
22
30
Ω
6
-
EXT2 "Low" ON Resistance
REXTBL2 FB2=0V, EXT2=0.4V
8
0.65
V
PWM2 "High" Voltage
-
-
VPWMH2 No Load
V
8
PWM2 "Low" Voltage
VPWML2 No Load
-
-
0.20
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 V
DD
of 0.8V, the output voltage and switching frequency are stabilized at V
DD
≥
2.0V. Therefore, a V
DD
of more than 2.0V is recommended when V
DD
is supplied from V
IN
or other power sources.
7
1
3
3
8
2) Although the IC's switching operations start from a V
IN
of 0.9V, the IC's power supply pin (V
DD
) and output voltage monitor pin
(FB1) should be connected to V
OUT1
. With operations from V
IN
=0.9V, the 2nd channel's (output 2) EN2 pin should be set to chip
disable. Once ouput voltage V
OUT1
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
XC9502 Series
!
Electrical Characteristics
Common Characteristics
PARAMETER
Supply Voltage (note 1)
Max. Input Voltage
Output Voltage Range
(note 3)
SYMBOL
VDD
VIN
2ch. Step-up / down DC/DC Controller ICs
XC9502B093
(FOSC=300kHz)
CONDITIONS
MIN.
2.0
10.0
0.9
0.9
2.0
0.9
-
-
-
-
-
-
-
255
0.65
-
-
-
-
-
-
-
TYP.
-
-
-
-
-
-
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=25
O
C
TEST
UNITS
CIRCUIT
V
1
V
1
V
1
V
V
2
V
µA
3
µA
3
µA
3
µA
3
µA
3
µA
3
µA
3
kHz
3
V
3
V
3
µA
3
µA
3
µA
3
µA
3
µA
3
µA
3
Ta=25
O
C
TEST
UNITS
CIRCUIT
V
4
V
V
V
%
%
%
%
mS
Ω
Ω
V
V
2
1
3
3
3
5
5
5
6
6
5
5
VDD
≥
2.0V, IOUT1, 2=1mA
VOUTSET VDD≠VOUT1
VIN
≥
0.9V, IOUT1, 2=1mA
VDD=VOUT1
Supply Current 1
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
ISTB
Same as IDD1, EN1=EN2=0V
Stand-by Current
Switching Frequency
FOSC
Same as IDD1
EN1,2 "High" Voltage
VENH
FB1,2=0V
EN1,2 "Low" Voltage
VENL
FB1,2=0V
IENH
FB1,2=3.0V
EN1,2 "High" Current
IENL
EN1,2=0V, FB1,2=3.0V
EN1,2 "Low" Current
PWM1,2 "High" Current
IPWMH FB1, 2=3.0V, PWM=3.0V
PWM1,2 "Low" Current
IPWML
FB1, 2=3.0V, PWM=0V
IFBH
FB1, 2=3.0V
FB1,2 "High" Current
VFBL
FB1, 2=1.0V
FB1,2 "Low" Current
Unless otherwise stated, VDD=3.0V, PWM1,2=3.0V, EN1, 2 =3.0V
Output 1 Characteristics
PARAMETER
FB1 Voltage
SYMBOL
VFB1
Step-up Controller
CONDITIONS
VOUT1
VOUT2
VOUT1
VOUT2
MIN.
TYP.
MAX.
0.918
0.9
2.0
0.8
85
0
38
-
20.0
47
30
-
0.20
VDD=3.0V, VIN=1.5V, IOUT1=10mA
0.882 0.900
Using Tr: 2SD1628,
Operation Start-up Voltage1
-
-
VST1-1 IOUT1=1.0mA, RFB11=200kΩ, RFB12=75kΩ
(note 2)
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
IOUT=130mA
85
Efficiency1 (note 4)
EFFI1
-
N-ch MOSFET:XP161A1355P
VOUT1
×
0.95V, EN1=0V→0.65V
Soft-Start Time1
TSS1
5.0
10.0
28
EXT1 "High" ON Resistance REXTBH1 FB1=0, EXT1=VDD-0.4V
-
22
EXT1 "Low" ON Resistance
REXTBL1 EN1=FB2=0V, EXT1=0.4V
-
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
Output 2 Characteristics
PARAMETER
FB2 Voltage
Minimum Operation Voltage
Maximum Duty Ratio2
Minimum Duty Ratio2
PFM Duty Ratio2
SYMBOL
VFB2
VINmin
MAXDTY2
MINDTY2
PFMDTY2
Step-down Controller
CONDITIONS
VIN=3.0V, IOUT2=10mA
MIN.
0.900
-
100
-
22
TYP.
0.900
-
-
-
30
MAX.
0.900
2.0
-
0
38
-
20.0
47
30
-
0.20
Same as IDD1
Same as IDD2
No Load, VPWM2=0V
IOUT2=250mA
Efficiency2
EFFI2
-
92
P-ch MOSFET : XP162A12A6P
VOUT2
×
0.95V, EN2=0V→0.65V
Soft-Start Time2
TSS2
5.0
10.0
28
EXT2 "High" ON Resistance REXTBH2 EN2=0V, EXT2=VDD-0.4V
-
22
EXT2 "Low" ON Resistance
REXTBL2 FB2=0V, EXT2=0.4V
-
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
Ta=25
O
C
TEST
UNITS
CIRCUIT
V
7
V
1
%
3
%
3
%
8
%
mS
Ω
Ω
V
V
8
8
6
6
8
8
Notes
1) Although the IC's step-up operations start from a V
DD
of 0.8V, the output voltage and switching frequency are stabilized at V
DD
≥
2.0V. Therefore, a V
DD
of more than 2.0V is recommended when V
DD
is supplied from V
IN
or other power sources.
2) Although the IC's switching operations start from a V
IN
of 0.9V, the IC's power supply pin (V
DD
) and output voltage monitor pin
(FB1) should be connected to V
OUT1.
With operations from V
IN
=0.9V, the 2nd channel's (output 2) EN2 pin should be set to chip
disable. Once ouput voltage V
OUT1
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
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