XC9502
Series
2ch.Step-Up/Down DC/DC Controller ICs
ETR0702_001
☆GO-Compatible
XC9502 series is 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 and 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. 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 (Output1) and offers protection against
in-rush currents when the power is switched. This also prevents voltage overshoot.
■
GENERAL DESCRIPTION
■APPLICATIONS
●
PDAs
■FEATURES
2ch DC/DC Controller
<Output 1: Step-Up DC/DC Controller>
: 1.5V ~ 30V (set by FB1 pin)
: More than 300mA
(V
IN
=1.8V,V
OUT
=3.3V)
: 80% (TYP.)
Maximum Duty Cycle
: 83% (TYP.)
High Efficiency
<Output 2: Step-Down DC/DC Controller>
Output Voltage Range : 0.9V ~ 6.0V (set by FB2 pin)
Output Current
:
≦1000mA
(V
IN
=3.3V, V
OUT
=1.8V)
: 100% (TYP.)
Maximu Duty Cycle
: 92% (TYP.)
High Efficiency
<Common>
Supply Voltage Range
Input Voltage Range
Oscillation Frequency
Control Method
Stand-by Function
Soft-Start Time
Package
Output Voltage Range
Output Current
●Palmtop
computers
●Portable
audio
●Various
power supplies
: 2.0V ~ 10.0V
: 0.9V ~ 10.0V
: 180kHz (±15%)
* 300kHz, 500kHz custom
: PWM or PWM/PFM selectable
: 3.0μF (MAX.)
: 10ms (internally set)
: MSOP-10, USP-10
■TYPICAL
APPLICATION CIRCUIT
<XC9502B092A Input : 2 cell, V
OUT
①:
3.3V, V
OUT
②:
1.8V >
■TYPICAL
PERFORMANCE
CHARACTERISTICS
1/43
XC9502
Series
■PIN
CONFIGURATION
1 EX T1
2 VD D
3 FB1
4 PW M1
5 E N1
EX T2 1 0
EXT2 10
GN D 9
F B2 8
PW M2 7
EN 2 6
1 EXT1
2 VDD
3 FB1
4 PWM1
5 EN1
GND 9
FB2 8
PWM2 7
EN2 6
M
MSOP-10
0
SO P -1
(TOP
(TO P
VIEW)
W )
VIE
USP-10
(BOTTOM 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 N-ch 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 V
OUT1
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 V
DD
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 V
DD
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
V
DD
, 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 V
OUT2
and Ground.>
Ground
Channel 2: External Transistor Drive Pin <Connected to P-ch Power MOSFET Gate>
■PRODUCT
CLASSIFICATION
●Ordering
Information
XC9502①②③④⑤⑥
DESIGNATOR
①
② ③
④
DESCRIPTION
Type of DC/DC Controller
Output Voltage
Oscillation Frequency
SYMBOL
B
09
2
3
5
A
D
R
L
DESCRIPTION
: Standard type (10 pin)
: FB products
→ ②=0, ③=9
fixed
: 180kHz
: 300kHz (custom)
: 500kHz (custom)
: MSOP-10
: USP-10
: Embossed tape, standard feed
: Embossed tape, reverse feed
⑤
⑥
Package
Device Orientation
2/43
XC9502
Series
■BLOCK
DIAGRAM
■ABSOLUTE
MAXIMUM RATINGS
Ta=25℃
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
MSOP-10
USP-10
SYMBOL
V
DD
V
FB
V
EN
V
PWM
V
EXT
I
EXT
Pd
Topr
Tstg
RATINGS
- 0.3 ~ 12.0
- 0.3 ~ 12.0
- 0.3 ~ 12.0
- 0.3 ~ 12.0
- 0.3 ~ V
DD
+ 0.3
± 100
150
150
- 40 ~ + 85
- 55 ~ + 125
UNITS
V
V
V
V
V
mA
mW
O
O
Operating Temperature Range
Storage Temperature Range
C
C
* Voltage is all ground standardized.
3/43
XC9502
Series
■ELECTRICAL
CHARACTERISTICS
XC9502B092
Common Characteristics
SYMBOL
V
DD
V
IN
V
OUTSET
I
DD1
I
DD1-1
I
DD1-2
I
DD1-3
I
DD1-4
I
DD2
I
STB
FOSC
V
ENH
V
ENL
I
ENH
I
ENL
I
PWMH
I
PWML
I
FBH
V
FBL
PARAMETER
Supply Voltage (*1)
Maximum Input Voltage
Output Voltage Range (*3)
Supply Current 1
Supply Current 1-1
Supply Current 1-2
Supply Current 1-3
Supply Current 1-4
Supply Current 2
Stand-by Current
Oscillation Frequency
EN1, 2 "High" Voltage
EN1, 2 "Low" Voltage
EN1, 2 "High" Current
EN1, 2 "Low" Current
PWM1, 2 "High" Current
PWM1, 2 "Low" Current
FB1, 2 "High" Current
FB1, 2 "Low" Current
CONDITIONS
(FOSC=180kHz)
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
V
IN
160
120
110
160
130
130
3.0
207
−
0.20
0.50
-0.50
0.50
-0.50
0.50
-0.50
UNITS
V
V
V
V
V
V
μA
μA
μA
μA
μA
μA
μA
kHz
V
V
μA
μA
μA
μA
μA
μA
Ta=25℃
CIRCUIT
①
①
①
②
③
③
③
③
③
③
③
③
③
③
③
③
③
③
③
③
V
DD
≧2.0V,
I
OUT1, 2
=1mA
V
DD
≠V
OUT1
V
IN
≧0.9V,
I
OUT1, 2
=1mA
V
DD
=V
OUT1
FB1, 2=0V
EN1=3.0V, EN2=0V, FB1=0V
EN2=3.0V, EN1=0V, FB2=0V
FB1=0V, FB2=1.0V
FB1=1.0V, FB2=0V
FB1, 2=1.0V
Same as I
DD1
, EN1=EN2=0V
Same as I
DD1
FB1, 2=0V
FB1, 2=0V
EN1, 2=3.0V
EN1, 2=0V, FB1, 2=3.0V
FB1, 2=3.0V, PWM=3.0V
FB1, 2=3.0V, PWM=0V
FB1, 2=3.0V
FB1, 2=1.0V
V
OUT1
V
OUT2
V
OUT1
V
OUT2
Unless otherwise stated, V
DD
=3.0V, PWM1, 2=3.0V, EN1, 2 =3.0V
Output 1 Characteristics: Step-Up Controller
PARAMETER
FB1 Voltage
Operation Start Voltage1 (*2)
Oscillation Start-up Voltage1
Maximum Duty Ratio1
Minimum Duty Ratio1
PFM Duty Ratio1
Efficiency 1 (*4)
Soft-Start Time1
EXT1 "High" ON Resistance
EXT1 "Low" ON Resistance
PWM1 "High" Voltage
PWM1 "Low" Voltage
SYMBOL
V
FB1
V
ST1-1
V
ST2-1
MAXDTY1
MINDTY1
PFMDTY1
EFFI1
T
SS1
R
EXTBH1
R
EXTBL1
V
PWMH1
V
PWMH1
CONDITIONS
V
DD
=3.0V, V
IN
=1.5V, I
OUT1
=10mA
Using Tr: 2SD1628
I
OUT1
=1.0mA, R
FB11
=200kΩ, R
FB12
=75kΩ
V
DD
≠V
OUT1
: I
OUT1
=1mA
FB1=0V
Same as I
DD1
Same as I
DD2
No Load, V
PWM1
=0V
I
OUT1
=30mA,
N-ch MOSFET: XP161A1355P
V
OUT1
×0.95V,
EN1=0V→0.65V
FB1=0, EXT1=V
DD
-0.4V
EN1=FB2=0V, EXT1=0.4V
No Load
No Load
MIN.
0.882
−
−
−
75
−
22
−
5.0
−
−
0.65
−
TYP.
0.900
−
−
−
80
−
30
85
10.0
28
22
−
−
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
CIRCUIT
④
②
①
③
③
③
⑤
⑤
⑤
⑥
⑥
⑤
⑤
Ta=25℃
Unless otherwise stated, V
DD
=EN1=PWM1=3.0V, EN2=PWM2=GND, EXT2=OPEN, FB2=OPEN, V
IN
=1.8V
Output 2 Characteristics: Step-Down Controller
PARAMETER
FB 2 Voltage
Minimum Operating Voltage
Maximum Duty Ratio 2
Minimum Duty Ratio 2
PFM Duty Ratio 2
Efficiency 2 (*4)
Soft-Start Time 2
EXT2 "High" ON Resistance
EXT2 "Low" ON Resistance
PWM2 "High" Voltage
PWM2 "Low" Voltage
SYMBOL
V
FB2
V
INmin
MAXDTY2
MINDTY2
PFMDTY2
EFFI2
T
SS2
R
EXTBH2
R
EXTBL2
V
PWMH2
V
PWMH2
CONDITIONS
V
IN
=3.0V, I
OUT2
=10mA
Same as I
DD1
Same as I
DD2
No Load, V
PWM2
=0V
I
OUT2
=250mA
P-ch MOSFET: XP162A12A6P
V
OUT2
×0.95V,
EN2=0V→0.65V
EN2=0, EXT2=V
DD
-0.4V
FB2=0V, EXT2=0.4V
No Load
No Load
MIN.
0.882
−
100
−
22
−
5.0
−
−
0.65
−
TYP.
0.900
−
−
−
30
92
10.0
28
22
−
−
MAX.
0.918
2.0
−
0
38
−
20.0
47
30
−
0.20
UNITS
V
V
%
%
%
%
ms
Ω
Ω
V
V
Ta=25℃
CIRCUIT
⑦
①
③
③
⑧
⑧
⑧
⑥
⑥
⑧
⑧
Unless otherwise stated, V
DD
=EN2=PWM2=3.0V, PWM1=EN1=GND, EXT1=OPEN, FB1=OPEN, V
IN
=5.0V
NOTE: *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 output 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 external components.
*4 : EFFI={ [ (Output voltage)
×
(Output current) ] / [ (Input voltage)
×
(Input current) ] }
×100
4/43
XC9502
Series
■ELECTRICAL
CHARACTERISTICS (Continued)
XC9502B093
Common Characteristics
SYMBOL
V
DD
V
IN
V
OUTSET
I
DD1
I
DD1-1
I
DD1-2
I
DD1-3
I
DD1-4
I
DD2
I
STB
FOSC
V
ENH
V
ENL
I
ENH
I
ENL
I
PWMH
I
PWML
I
FBH
V
FBL
CONDITIONS
(FOSC=300kHz)
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
−
−
V
IN
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
UNITS
V
V
V
V
V
V
μA
μA
μA
μA
μA
μA
μA
kHz
V
V
μA
μA
μA
μA
μA
μA
Ta=25℃
CIRCUIT
①
①
①
②
③
③
③
③
③
③
③
③
③
③
③
③
③
③
③
③
PARAMETER
Supply Voltage (*1)
Maximum put Voltage
Output Voltage Range (*3)
Supply Current 1
Supply Current 1-1
Supply Current 1-2
Supply Current 1-3
Supply Current 1-4
Supply Current 2
Stand-by Current
Oscillation Frequency
EN1, 2 "High" Voltage
EN1, 2 "Low" Voltage
EN1, 2 "High" Current
EN1, 2 "Low" Current
PWM1, 2 "High" Current
PWM1, 2 "Low" Current
FB1, 2 "High" Current
FB1, 2 "Low" Current
V
DD
≧0V,
I
OUT1, 2
=1mA
V
DD
≠V
OUT1
V
IN
≧0.9V,
I
OUT1, 2
=1mA
V
DD
=V
OUT1
FB1, 2=0V
EN1=3.0V, EN2=0V, FB1=0V
EN2=3.0V, EN1=0V, FB2=0V
FB1=0V, FB2=1.0V
FB1=1.0V, FB2=0V
FB1, 2=1.0V
Same as I
DD1
, EN1=EN2=0V
Same as I
DD1
FB1, 2=0V
FB1, 2=0V
EN1, 2=3.0V
EN1, 2=0V, FB1, 2=3.0V
FB1, 2=3.0V, PWM=3.0V
FB1, 2=3.0V, PWM=0V
FB1, 2=3.0V
FB1, 2=1.0V
V
OUT1
V
OUT2
V
OUT1
V
OUT2
Unless otherwise stated, V
DD
=3.0V, PWM1,2=3.0V, EN1, 2 =3.0V
Output 1 Characteristics: Step-Up Controller
PARAMETER
FB1 Voltage
Operation Start Voltage
(*2)
SYMBOL
V
FB1
V
ST1-1
V
ST2-1
MAXDTY1
MINDTY1
PFMDTY1
EFFI1
T
SS1
R
EXTBH1
R
EXTBL1
V
PWMH1
V
PWMH1
CONDITIONS
V
DD
=3.0V, V
IN
=1.5V, I
OUT1
=10mA
Using Tr: 2SD1628
I
OUT1
=1.0mA, R
FB11
=200kΩ, R
FB12
=75kΩ
V
DD
≠V
OUT1
: I
OUT1
=1mA
FB1=0V
Same as I
DD1
Same as I
DD2
No Load, V
PWM1
=0V
I
OUT
=130mA
N-ch MOSFET: XP161A1355P
V
OUT1
×0.95V,
EN1=0V→0.65V
FB1=0, EXT1=V
DD
-0.4V
EN1=FB2=0V, EXT1=0.4V
No Load
No Load
MIN.
0.882
−
−
−
75
−
22
−
5.0
−
−
0.65
−
TYP.
0.900
−
−
−
80
−
30
85
10.0
28
22
−
−
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
Ta=25℃
CIRCUIT
④
②
①
③
③
③
⑤
⑤
⑤
⑥
⑥
⑤
⑤
Oscillation Start Voltage2
Maximum Duty Ratio
Minimum Duty Ratio
PFM Duty Ratio
Efficiency (*4)
Soft-Start Time
EXT1 "High" ON Resistance
EXT1 "Low" ON Resistance
PWM1 "High" Voltage
PWM1 "Low" Voltage
Unless otherwise stated, V
DD
=EN1=PWM1=3.0V, EN2=PWM2=GND, EXT2=OPEN, FB2=OPEN, V
IN
=1.8V
Output 2 Characteristics: Step-Down Controller
PARAMETER
FB2 Voltage
Minimum Operating Voltage
Maximum Duty Ratio 2
Minimum Duty Ratio 2
PFM Duty Ratio 2
SYMBOL
V
FB2
V
INmin
MAXDTY2
MINDTY2
P
FMDTY2
CONDITIONS
V
IN
=3.0V, I
OUT2
=10mA
MIN.
0.900
−
100
−
22
TYP.
0.900
−
−
−
30
MAX.
0.900
2.0
−
0
38
−
20.0
47
30
−
0.20
UNITS
V
V
%
%
%
%
ms
Ω
Ω
V
V
Ta=25℃
CIRCUIT
⑦
①
③
③
⑧
⑧
⑧
⑥
⑥
⑧
⑧
Same as I
DD1
Same as I
DD2
No Load, V
PWM2
=0V
I
OUT2
=250mA
Efficiency 2 (*4)
EFFI2
−
92
P-ch MOSFET: XP162A12A6P
V
OUT2
×0.95V,
EN2=0V→0.65V
Soft-Start Time 2
T
SS2
5.0
10.0
−
EXT2 "High" ON Resistance
R
EXTBH2
EN2=0, EXT2=V
DD
-0.4V
28
−
EXT2 "Low" ON Resistance
R
EXTBL2
FB2=0V, EXT2=0.4V
22
PWM2 "High" Voltage
V
PWMH2
No Load
0.7
−
−
−
PWM2 "Low" Voltage
No Load
V
PWMH2
Unless otherwise stated, V
DD
=EN2=PWM2=3.0V, PWM1=EN1=GND, EXT1=OPEN, FB1=OPEN, V
IN
=5.0V
NOTE: *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 output 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 external components.
*4 : EFFI={ [ (output voltage)
×
(output current) ] / [ (input voltage)
×
(input current) ] }
×
100
5/43
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