XC9106 / 07 Series
Preliminary
Externally Applied Reference Voltage (Vref)
Ceramic Capacitors Compatible
Input Voltage Range: 0.9V~10.0V
Oscillation Frequency: 300kHz, 100kHz (±15%)
PWM Control (XC9106)
PWM/PFM Automatic Switching Control (XC9107)
SOT-25 / USP-6B Package
PWM Control, PWM/PFM Switching Control,
Step-up DC/DC Converters
Externally Applied Reference Voltage (Vref)
May 23, 2002 Ver. 1-1
Applications
Power Supply for LCD
PDAs
Cellular Phones
Palmtop Computers
Portable Audio Systems
Various Multi-function Power Supplies
General Description
The XC9106 / 07 series are step-up DC/DC controller ICs with
an externally applied reference voltage (Vref).
Output voltage will be set with external resistors (RFB1 and 2)
and Vref value. The series make it easy to control output
voltage externally and are suited to software applications that
need to vary voltage, such as LCD power supply for PDA.
Output will be stable no matter which load capacitors are used
but if a low ESR capacitor is used, R
SENSE
of about 0.1Ω will
be required and phase compensation will be achieved. This
makes the use of ceramic capacitors much easier, and allows
for lower output ripple and reduced PCB area requirements.
Tantalum and electrolytic capacitors can also be used, in which
case, R
SENSE
becomes unnecessary.
Oscillation frequencies of high clock, low ripple 300kHz and low
supply current 100kHz are available.
The XC9107 series are PWM/PFM automatic switching
controlled. Control switches from PWM to PFM during light
loads with the XC9107 and the series is highly efficient from
light loads to large output currents. By bringing the whole circuit
down while the series is in the stand-by mode (CE/PWM pin :
low), supply current can be reduced to less than 1.0µA.
Features
0.9V ~ 10.0V
Power Supply Voltage Range:
1.8V ~ 10.0V and more than Vref+0.7V
V
REF
Input Range:
0.8V ~ 2.5V (±2.0%)
Output Voltage:
Vref x external split resistor ratio
V
OUT
=Vref x (RFB1+RFB2)/RFB2
Oscillation Frequency:
300kHz, 100kHz
±15%
Output Current:
more than 30mA
(V
IN
=3.3V, V
OUT
=20V, when peripheral
components are used as in the circuits
below .)
Input Voltage Range:
Controls:
High Efficiency:
Stand-by Current:
Load Capacitors:
Packages:
PWM (XC9106)
PWM/PFM auto-switching (XC9107)
85% (TYP.)
ISTB=1.0µA (MAX.)
Low ESR capacitors compatible
SOT-25, USP-6B
Typical Application Circuit
Electrical Characteristics
XC9107D003MR
30
L : 10µH
V
OUT
(V)
25
20
15
10
5
0
CIN
V
IN
= 3.3V
0.0
0.5
1.0
Nch Power
MOS FET
2SK2159
1.5 2.0
Vref (V)
2.5
3.0
Circuit as left
V
DD
=V
IN
=3.3V, I
OUT
=30mA
RSENSE : 100m
Ω
for Ceramic CL SD : MA737
*
CFB : 27pF
V
OUT
= 8V~25V RFB1 :
I
OUT
= 30mA 270k
Ω
RFB2 :
30k
Ω
Ceramic CL :
10µF
1
2
3
CE/Vref
5
XC9107D003MR
30
25
V
OUT
(V)
20
15
10
5
0
0.1
1
Circuit as left
V
DD
=V
IN
=3.3V
4
0.8V~2.5V
D/A converter
2.5V
2.0V
1.5V
Vref=0.8V
10
I
OUT
(mA)
100
1000
* R
SENSE
is of no use in light load (uncontinuous mode)
applications such as a small LCD, even using ceramic capacitor.
1
XC9106 / 07 Series
Preliminary
Pin Configuration
PWM Control, PWM/PFM Switching Control,
Step-up DC/DC Converters
Externally Applied Reference Voltage (Vref)
Pin Assignment
PIN
SOT-25
USP-6B NAME
FB
1
6
V
DD
2
2
PIN NUMBER
FUNCTION
Output Resistor Connection
Supply Voltage
Serves as both Chip Enable pin and
Reference Voltage Apply pin.
Ground
External Transistor Connection
No Connection
5
4
1
2
3
6
5
4
3
4
5
-
4
3
1
5
CE/
Vref
GND
EXT
NC
1
2
3
SOT-25
(TOP VIEW)
USP-6B
(TOP VIEW)
Ordering Information
XC9106D
12345
XC9106 Series: PWM Control
XC9107D
12345
XC9107 Series: PWM/PFM automatic switching control
(Ordering information is the same as XC9106 Series)
12
3
4
5
3
1
M
D
R
L
Reference Voltage (apply external)
Fixed : 00
Oscillation Frequency: 300kHz
100kHz
Package:
SOT-25 (1 reel = 3000 pcs.)
USP-6B (1 reel = 3000 pcs.)
Standard Feed
Reverse Feed
Embossed Tape:
Block Diagram
FB
Current
Ripple Detect
and FB
Phase
Compensation
VDD
PWM
Comparator
Error Amp.
Vref with
Soft Start,
CE
CE / Vref
PWM/PFM
Controller
Ramp Wave
Generator,
OSC
Buffer,
Driver
EXT
GND
FB, CE : CMOS INPUT
EXT
: CMOS OUTPUT
Absolute Maximum Ratings
PARAMETER
V
DD
pin Voltage
FB pin Voltage
CE / Vref pin Voltage
EXT pin Voltage
EXT pin Current
Power Dissipation
Operating Ambient Temperature
Storage Temperature
SYMBOL
V
DD
FB
V
CE
/ Vref
V
EXT
I
EXT
/
Pd
SOT-25
USP-6B
RATINGS
-0.3 ~ 12.0
-0.3 ~ 12.0
-0.3 ~ 12.0
-0.3 ~ V
DD
+ 0.3
±100
150
100
-40 ~ +85
-55 ~ +125
2
Ta = 25
O
C
UNITS
V
V
V
V
mA
mW
O
O
Topr
Tstg
C
C
XC9106 / 07 Series
Preliminary
Electrical Characteristics
XC9106D001MR, XC9107D001MR
PARAMETER
Output Voltage
Reference Voltage Range
FB Control Voltage
*1
*1
Power Supply Voltage Range
PWM Control, PWM/PFM Switching Control,
Step-up DC/DC Converters
Externally Applied Reference Voltage (Vref)
(FOSC=100 (kHz)
MIN.
8.820
Vref = 0.9V
0.8
0.882
Vref = 0.9V
VDD as shown right or
(Vref applied voltage + 0.7V)
1.8
CONDITIONS
Recommended Circuit using 2SD1628, I
OUT
=1.0mA
Ta=25
O
C
TYP.
9.000
0.900
MAX.
9.180
2.5
0.918
10.0
0.9
0.8
0.7
41
19
1.0
115
87
36
20.0
0.20
36
24
2.5
-0.1
0.1
-0.1
UNITS
V
V
V
V
V
V
V
µA
µA
µA
KHz
%
%
%
mS
V
V
Ω
Ω
µA
µA
µA
µA
Circuit
Operation Start Voltage
Oscillation Start Voltage
SYMBOL
V
OUT
Vref
V
FB
V
DD
V
ST1
V
ST2
1
-
4
-
3
4
3
4
4
5
4
4
1
1
1
5
5
4
4
5
5
5
5
No external connections
CE/Vref=0.9V, Voltage applied, FB=0V
29
14
85
75
20
5.0
0.65
100
81
28
85
10.0
V
HLD
Operation Holding Voltage
Recommended Circuit using 2SD1628, IOUT=1.0mA
I
DD1
Same as V
ST2
, V
DD
=3.300V
Supply Current 1
I
DD2
Same as I
DD1
, FB=1.2V
Supply Current 2
Same as I
DD1
, CE/Vref=0V
I
STB
Stand-by Current
FOSC Same as I
DD1
Oscillation Frequency
MAXDTY Same as I
DD1
Maximum Duty Ratio
PFMDTY No Load
PFM Duty Ratio
(XC9106 series)
EFFI
Recommended Circuit using XP161A1355
Efficiency
T
SS
Soft-start Time
Vref=0.9V
Same as I
DD1
V
CEH
CE "High" Voltage
Same as I
DD1
V
CEL
CE "Low" Voltage
EXT "High" ON Resistance R
EXTH
Same as I
DD1
, V
EXT
=V
OUT
-0.4V
R
EXTL
Same as I
DD1
, V
EXT
=0.4V
EXT "Low" ON Resistance
I
CEH
Same as I
DD2
, CE=2.5V
CE "High" Current
Same as I
DD2
, CE=0V
I
CEL
CE "Low" Current
Same as I
DD2
, CE=V
DD
I
FBH
FB "High" Current
Same as I
DD2
, CE=0V
I
FBL
FB "Low" Current
24
16
0.0
Test Conditions: Unless otherwise stated, CL: ceramic, recommended MOS FET should be connected.
0.09 (V) ,
Vref =
RFB1, 2 x 10
V
DD
= 3.30 (V)
50 (mA)
V
IN
=
3.30 (V)
I
OUT
=
Notes
*1 Although the IC starts step-up operations from a V
DD
of 0.8V, the output voltage and oscillation frequency are stabilized at
V
DD
≥
1.8V or (Vref applied voltage + 0.7V). Therefore, a V
DD
of more than 1.8V or (Vref applied voltage + 0.7V) is recommended when
V
DD
is supplied from V
IN
or other power sources.
3
XC9106 / 07 Series
Preliminary
Electrical Characteristics
XC9106D003MR, XC9107D003MR
PARAMETER
Output Voltage
Reference Voltage Range
FB Control Voltage
*1
*1
Power Supply Voltage Range
PWM Control, PWM/PFM Switching Control,
Step-up DC/DC Converters
Externally Applied Reference Voltage (Vref)
(FOSC=300 (kHz)
MIN.
Vref = 0.9V
8.820
0.8
Vref = 0.9V
0.882
VDD as shown right or
(Vref applied voltage + 0.7V)
1.8
Recommended Circuit using 2SD1628, I
OUT
=1.0mA
Ta=25
O
C
TYP.
9.000
0.900
MAX.
9.180
2.5
0.918
10.0
0.9
0.8
0.7
88
22
1.0
345
87
40
20.0
0.20
36
24
2.5
-0.1
0.1
-0.1
UNITS
V
V
V
V
V
V
V
µA
µA
µA
KHz
%
%
%
mS
V
V
Ω
Ω
µA
µA
µA
µA
Circuit
Operation Start Voltage
Oscillation Start Voltage
SYMBOL
V
OUT
Vref
V
FB
V
DD
V
ST1
V
ST2
CONDITIONS
1
-
4
-
3
4
3
4
4
5
4
4
1
1
1
5
5
4
4
5
5
5
5
No external connections
CE/Vref=0.9V, Voltage applied, FB=0V
62
16
255
75
24
5.0
0.65
300
81
32
85
10.0
V
HLD
Operation Holding Voltage
Recommended Circuit using 2SD1628, IOUT=1.0mA
Same as V
ST2
, V
DD
=3.300V
I
DD1
Supply Current 1
Same as I
DD1
, FB=1.2V
I
DD2
Supply Current 2
Same as I
DD1
, CE/Vref=0V
I
STB
Stand-by Current
Oscillation Frequency
FOSC Same as I
DD1
Maximum Duty Ratio
MAXDTY Same as I
DD1
PFM Duty Ratio
PFMDTY No Load
(XC9106 series)
Efficiency
EFFI
Recommended Circuit using XP161A1355
T
SS
Soft-start Time
Vref=0.9V
Same as I
DD1
V
CEH
CE "High" Voltage
Same as I
DD1
V
CEL
CE "Low" Voltage
EXT "High" ON Resistance R
EXTH
Same as I
DD1
, V
EXT
=V
OUT
-0.4V
R
EXTL
Same as I
DD1
, V
EXT
=0.4V
EXT "Low" ON Resistance
Same as I
DD2
, CE=2.5V
I
CEH
CE "High" Current
Same as I
DD2
, CE=0V
I
CEL
CE "Low" Current
Same as I
DD2
, CE=V
DD
I
FBH
FB "High" Current
Same as I
DD2
, CE=0V
I
FBL
FB "Low" Current
24
16
0.0
Test Conditions: Unless otherwise stated, CL: ceramic, recommended MOS FET should be connected.
Vref =
0.09 (V) ,
RFB1, 2 x 10
V
DD
= 3.30 (V)
V
IN
=
3.30 (V)
50 (mA)
I
OUT
=
Notes
*1 Although the IC starts step-up operations from a V
DD
of 0.8V, the output voltage and oscillation frequency are stabilized at
V
DD
≥
1.8V or (Vref applied voltage + 0.7V). Therefore, a V
DD
of more than 1.8V or (Vref applied voltage + 0.7V) is recommended when
V
DD
is supplied from V
IN
or other power sources.
Standard Circuit
RSENSE
C
FB
V
OUT
R
FB1
R
FB2
1
CL
2
3
CE/Vref
4
5
Nch Power
MOS FET
Cb
Rb
L
SD
V
IN
When obtaining V
DD
from a source other than V
OUT
, please
insert a capacitor C
DD
between the V
DD
pin and the GND pin in
order to provide stabler operations.
Please wire CL & C
IN
between the V
OUT
/V
DD
pin and the GND
pin. Strengthen the wiring sufficiently. When using a capacitor
other than ceramic or low ESR at CL, please take away
R
SENSE
and short.
Insert Rb and CB when using a
bipolar NPN Transistor.
4
XC9106 / 07 Series
Preliminary
Operational Description
PWM Control, PWM/PFM Switching Control,
Step-up DC/DC Converters
Externally Applied Reference Voltage (Vref)
The XC9106 / 07 series are reference voltage (Vref) apply external step-up DC/DC Controler ICs. Output voltage will be set with external
resistors (RFB1 and 2) and Vref value. The series make it easy to control output voltage externally and are suited to software applications
that need to vary voltage such as LCD power supply for PDA.
<Error Amp.>
Error Amplifier is designed to monitor the output voltage, comparing the feedback voltage (FB) with the reference voltage Vref. In
response to feedback of a voltage lower than the reference voltage Vref, the output voltage of the error amp. decreases.
<OSC Generator>
This circuit generates the internal reference clock.
<Ramp Wave Generator>
The Ramp Wave Generator generates a saw-tooth waveform based on outputs from the OSC Generator.
<PWM Comparator>
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 Controler>
This circuit generates PFM pulses.
The PWM/PFM automatic switching mode 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. Noise is easily reduced with
PWM control since the switching frequency is fixed. Because of the function, control suited to the application can easily be selected.
<Vref 1 with Soft Start>
The reference voltage of the XC9106/9107 series is adjusted and fixed by external applied voltage. (For output voltage settings, please
refer to the output voltage setting on page 6.)
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 error amp, the operation maintains a balance between the two inputs of error amps and
controls the EXT pin's ON time so that it doesn't increase more than is necessary.
The XC9106/9107 series alters soft start times by the setting value of reference voltage in order to protect against voltage overshoot and
also to protect against inrush current. Please determine soft start time by the formula equation.
TSS = 8.65 x Vref + 2.21
30
XC9106 / XC9107D xxx MR
Soft Start Time : TSS (ms)
[Example Computation]
Vref = 0.9V, TSS = 8.65 x 0.9 + 2.21 = 10.0 ms
25
20
15
10
5
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Reference Voltage Vref (V)
<Enable Function>
This function controls the operation and shutdown of the IC. When the voltage of the CE pin drops to 0.2V or less, disable mode will
be entered, the IC's operations will stop and the EXT pin will be kept at a low level (the external N-type MOSFET will be OFF) . When
the IC is in a state of chip disable, current consumption will be no more than 1.0µA.
When the CE pin's voltage rises to 0.65V or more, enable mode will be entered and operations will recommence. The CE pin also
doubles with reference voltage in the XC9106/9107 series, and the range of reference voltage can be varied externally from 0.8V to
2.5V.
5
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