TOREX XC9103, XC9104, XC9105 User Manual
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XC9103/XC9104/XC9105
Series
ETR0404_005
Ceramic Capacitor Compatible, Step-up DC/DC Controllers
■GENERAL DESCRIPTION
The XC9103/XC9104/XC9105 series are PWM, PWM/PFM auto switching /manual switching controlled universal step-up
DC/DC converter controllers.
Output will be stable no matter which load capacitors are used but should a low ESR capacitor be used, RSENSE of about 0.1Ω
will be required and phase compensation will be achieved. This allows the use of ceramic capacitors and enables to obtain lower
output ripple and small PCB design. Tantalum and electrolytic capacitors can also be used, in which case, R
unnecessary.
With 0.9V internal voltage reference and by using externally connected two resistors, output voltage can be set freely within a
range of 1.5V to 30V. The series is available in 300 kHz and 180 kHz frequencies, the size of the external components can be
reduced. 100 kHz and 500 kHz are also available in custom options.
The XC9103 offers PWM operation. The XC9104 offers PWM/PFM automatic switching operation. The PWM operation is shifted to
the PFM operation automatically at light load so that it maintains high efficiency over a wide range of load currents. The XC9105
offers both PWM and PWM/PFM auto switching operations and it can be selected by external signal.
A current limiter circuit is built-in to the IC (except with the 500 kHz version) and monitors the ripple voltage on the FB pin.
Operation is shut down when the ripple voltage is more than 250mV. The operations of the IC can be returned to normal with
a toggle of the CE pin or by turning the power supply back on.
■APPLICATIONS
●PDAs
●Cellular phones
●Palmtop computers
●Portable audio systems
●Various multi-function power supplies
■TYPICAL APPLICATION CIRCUIT
■FEATURES
Input Voltage Range : 0.9V ~ 10V
Supply Voltage Range : 1.8V ~ 10V
Output Voltage Range : 1.5V ~ 30V
Set freely with the reference voltage
Oscillation Frequency : 100, 180, 300, 500kHz (±15%)
Output Current : more than 400mA
(V
Controls : PWM (XC9103)
PWM/PFM manual switching
High Efficiency : 85% (TYP.)
Stand-by Current : I
Load Capacitors : Low ESR capacitors compatible
Current
Limiter Function
Also available without current limite
(100kHz and 500kHz types are
Packages : SOT-25, USP-6B
Environmentally Friendly
■ TYPICAL PERFORMANCE
CHARACTERISTICS
☆GreenOperation Compatible
SENSE becomes
0.9V(±2.0%) and two resistors
180, 300kHz only for XC9103/04/05B
type (with current limiter)
IN=1.8V, VOUT=3.3V)
PWM/PFM auto-switching (XC9104)
(XC9105)
=1.0μA (MAX.)
STB
: Operates when
ripple voltage=250mV
available only without current limiter)
: EU RoHS Compliant, Pb Free
1/23
XC9103/XC9104/XC9105
■PIN CONFIGURATION
■PIN ASSIGNMENT
EXT
FB
VDD
(TOP VIEW)
PIN NUMBER
GND
FB 6
CE
NC 5
CE 4
PIN NAME FUNCTION
Series
1 EXT
2 VDD
3 GND
The dissipation pad for the USP-6B
package should be solder-plated in
recommended mount pattern and metal
masking so as to enhance mounting
strength and heat release.
If the pad needs to be connected to other
pins, it should be connected to the V
(No.2) pin.
SOT-25 USP-6B
1 6 FB Output Resistor Connection
2 2 VDD Supply Voltage
3 4
CE Chip Enable
CE (/PWM) Serves as both PWM/PFM switching pin and CE pin for XC9105
4 3 GND Ground
5 1 EXT External Transistor Connection
- 5 NC No Connection
■ PRODUCT CLASSIFICATION
●Ordering Information
XC9103①②③④⑤⑥-⑦
XC9104①②③④⑤⑥-⑦
XC9105①②③④⑤⑥-⑦
(*1)
: PWM Control
(*1)
: PWM/PFM Automatic Switching Control
(*1)
: PWM/PFM Manual Switching Control
DESIGNATOR ITEM SYMBOL DESCRIPTION
① Type of DC/DC Controller
B With current limiter (180kHz, 300kHz only)
D Without current limiter
②③ Output Voltage 09 FB voltage (e.g. FB Voltage=0.9V→②=0, ③=9)
300kHz
④ Oscillation Frequency
3
1 100kHz
2 180kHz
5 500kHz
SOT-25 (3,000/Reel)
⑤⑥-⑦
Packages
(Oder Unit)
MR
MR-G SOT-25 (3,000/Reel)
DR USP-6B (3,000/Reel)
DR-G USP-6B (3,000/Reel)
(*1)
The “-G” suffix indicates that the products are Halogen and Antimony free as well as being fully RoHS compliant.
DD
2/23
■ BLOCK DIAGRAM
■ ABSOLUTE MAXIMUM RATINGS
Power Dissipation
Operating Temperature Range Topr -40 ~ +85
PAR AMETER SYMBOL RATINGS UNITS
VDD pin Voltage VDD -0.3 ~ 12.0 V
FB pin Voltage FB -0.3 ~ 12.0 V
CE pin Voltage VCE -0.3 ~ 12.0 V
EXT pin Voltage VEXT -0.3 ~ VDD + 0.3 V
EXT pin Current IEXT/ ±100 mA
SOT-25 150
USP-6B
Storage Temperature Range Tstg -40 ~ +125
Pd
100
XC9103/XC9104/XC9105
Series
Ta =2 5℃
mW
℃
℃
3/23
XC9103/XC9104/XC9105
■ELECTRICAL CHARACTERISTICS
XC9103B092MR, XC9104B092MR, XC9105B092MR
XC9103D092MR, XC9104D092MR, XC9105D092MR
PAR AMETER SYMBOL CONDITIONS MIN. TYP. MAX.
Output Voltage VOUT 3.234 3.300 3.366 V
Output Voltage Range VOUTSET
FB Control Voltage VFB 0.882 0.900 0.918 V
Supply Voltage Range
(*1)
DD
V
Operation Start Voltage VST1
Oscillation Start Voltage
(*1)
V
ST2
Operation Hold Voltage VHLD
Supply Current 1 IDD1 Same as VST2, VDD=3.3V - 45 64
Supply Current 2 IDD2 Same as IDD1, FB=1.2V - 17 24
Stand-by Current ISTB Same as IDD1, CE=0V - - 1.0
Oscillation Frequency f
OSC
Maximum Duty Cycle MAXDTY Same as IDD1 75 81 87 %
PFM Duty Rate PFMDTY No load (XC9104B/D, 9105B/D) 20 28 36 %
Overcurrent
Sense Voltage
(*3)
VLMT
Efficiency EFFI Recommended circuit using XP161A1355 - 85 - %
Soft-Start Time t
SS
CE “High” Voltage (*2) VCEH Same as IDD1 0.65 - - V
CE “Low” Voltage (*2) VCEL Same as IDD1 - - 0.20 V
PWM “High” Voltage (*2) VPWMH IOUT=1.0mA (XC9105B/D)
PWM “Low” Voltage (*2) VPWML IOUT=1.0mA (XC9105B/D) - -
EXT “High”
On Resistance
EXT “Low”
On Resistance
R
EXTH Same as IDD1, VEXT=VOUT-0.4V - 24 36
R
EXTL Same as IDD1, VEXT=0.4V - 16 24
CE “High Current ICEH Same as IDD2, CE=VDD - - 0.1
CE “Low” Current ICEL Same as IDD2, CE=0V - - - 0.1
FB “High” Current IFBH Same as IDD2, CE=VDD - - 0.1
FB “Low” Current IFBL Same as IDD2, CE=0V - - - 0.1
Test Conditions: Unless otherwise stated, CL: ceramic, recommended MOSFET should be connected.
NOTE:
*1 Although the IC starts step-up operations from a V
Therefore, a V
*2 With the XC9105 series, the CE pin also serves as a PWM/PFM switching pin. In operation, PWM control is selected when the voltage
at the CE pin is more than V
the voltage at the CE pin is less than V
*3 The overcurrent limit circuit of this IC is designed to monitor the ripple voltage so please select your external components carefully to
prevent V
circuit operations, which in turn causes the IC's operations to stop, the operations of the IC can be returned to normal with a toggle of
the CE pin or by turning the power supply back on.
V
OUT=3.3V, VIN=2.0V, IOUT=170mA
DD of more than 1.8V is recommended when VDD is supplied from VIN or other power sources.
DD -0.2V. On the other hand, PWM/PFM automatic switching control at a duty = 25% is selected when
LMT being reached under low temperature conditions as well as normal operating conditions. Following current limiter
VIN=VOUTSETx0.6, VDD=3.3V
I
OUT=10mA, Using 2SD1628
Recommended circuit using 2SD1628,
I
OUT=1.0mA
No external components, CE connected
to V
DD, Voltage applied, FB=0V
Recommended circuit using 2SD1628,
I
OUT=1.0mA
Same as IDD1 153 180 207 kHz
Step input to FB (Pulse width: 2.0μS
or more), EXT=Low level voltage
(XC9103B, 9104B, 9105B)
5.0 10.0 20.0 ms
DD of 0.8V, the output voltage and oscillation frequency are stabilized at VDD>1.8V.
DD -1.0V and more than VCEH.
Series
(f
=180kHz) Ta= 2 5℃
OSC
UNITS CIRCUIT
①
1.5 - 30.0 V
②
④
1.8 - 10.0 V
- - 0.9 V
- - 0.8 V
- - 0.7 V
③
④
③
μA ④
μA ④
μA ⑤
④
④
①
170 250 330 mV
⑥
①
①
⑤
⑤
VDD-0.2
- V
VDD-1.0
V
Ω
①
①
④
Ω ④
μA ⑤
μA ⑤
μA ⑤
μA ⑤
4/23
XC9103/XC9104/XC9105
Series
■ELECTRICAL CHARACTERISTICS (Continued)
XC9103B093MR, XC9104B093MR, XC9105B093MR
XC9103D093MR, XC9104D093MR, XC9105D093MR
PAR AMETER SYMBOL CONDITIONS MIN. TYP. MAX.
Output Voltage VOUT 3.234 3.300 3.366 V
Output Voltage Range VOUTSET
VIN=VOUTSETx0.6, VDD=3.3V
I
OUT=10mA, Using 2SD1628
FB Control Voltage VFB 0.882 0.900 0.918 V
Supply Voltage Range
(*1)
DD
V
Operation Start Voltage VST1
Oscillation Start Voltage
(*1)
V
ST2
Operation Hold Voltage VHLD
Recommended circuit using 2SD1628,
I
OUT=1.0mA
No external components, CE connected
to V
DD, Voltage applied, FB=0V
Recommended circuit using 2SD1628,
I
OUT=1.0mA
Supply Current 1 IDD1 Same as VST2, VDD=3.3V - 62 88
Supply Current 2 IDD2 Same as IDD1, FB=1.2V - 16 22
Stand-by Current ISTB Same as IDD1, CE=0V - - 1.0
Oscillation Frequency f
Same as IDD1 255 300 345 kHz
OSC
Maximum Duty Cycle MAXDTY Same as IDD1 75 81 87 %
PFM Duty Rate PFMDTY No load (XC9104B/D, 9105B/D) 24 32 40 %
Overcurrent
Sense Voltage
(*3)
VLMT
Step input to FB (Pulse width: 2.0μS
or more), EXT=Low level voltage
(XC9103B, 9104B, 9105B)
Efficiency EFFI Recommended circuit using XP161A1355 - 85 - %
Soft-Start Time tSS 5.0 10.0 20.0 ms
CE “High” Voltage (*2) VCEH Same as IDD1 0.65 - - V
CE “Low” Voltage (*2) VCEL Same as IDD1 - - 0.20 V
PWM “High” Voltage (*2) VPWMH IOUT=1.0mA (XC9105B/D)
VDD-0.2
PWM “Low” Voltage (*2) VPWML IOUT=1.0mA (XC9105B/D) - -
EXT “High”
On Resistance
EXT “Low”
On Resistance
R
EXTH Same as IDD1, VEXT=VOUT-0.4V - 24 36
R
EXTL Same as IDD1, VEXT=0.4V - 16 24
CE “High Current ICEH Same as IDD2, CE=VDD - - 0.1
CE “Low” Current ICEL Same as IDD2, CE=0V - - - 0.1
FB “High” Current IFBH Same as IDD2, CE=VDD - - 0.1
FB “Low” Current IFBL Same as IDD2, CE=0V - - - 0.1
Test Conditions: Unless otherwise stated, CL: ceramic, recommended MOSFET should be connected.
NOTE:
*1 Although the IC starts step-up operations from a V
Therefore, a V
*2 With the XC9105 series, the CE pin also serves as a PWM/PFM switching pin. In operation, PWM control is selected when the voltage
at the CE pin is more than V
the voltage at the CE pin is less than V
*3 The overcurrent limit circuit of this IC is designed to monitor the ripple voltage so please select your external components carefully to
prevent V
circuit operations, which in turn causes the IC's operations to stop, the operations of the IC can be returned to normal with a toggle of
the CE pin or by turning the power supply back on.
DD of more than 1.8V is recommended when VDD is supplied from VIN or other power sources.
DD -0.2V. On the other hand, PWM/PFM automatic switching control at a duty = 25% is selected when
DD -1.0V and more than VCEH.
LMT being reached under low temperature conditions as well as normal operating conditions. Following current limiter
DD of 0.8V, the output voltage and oscillation frequency are stabilized at VDD>1.8V.
(f
=300 kHz) Ta= 2 5℃
OSC
UNITS CIRCUIT
①
1.5 - 30.0 V
②
④
1.8 - 10.0 V
- - 0.9 V
- - 0.8 V
- - 0.7 V
③
④
③
μA ④
μA ④
μA ⑤
④
④
①
220 300 380 mV
⑥
①
①
⑤
⑤
- - V
VDD-1.0
V
Ω
①
①
④
Ω ④
μA ⑤
μA ⑤
μA ⑤
μA ⑤
5/23
XC9103/XC9104/XC9105
■ TYPICAL APPLICATION CIRCUIT
■NOTES ON USE
When obtaining VDD from a source other than VOUT,
please insert a capacitor CDD between the VDD pin and
the GND pin in order to provide stable operations.
Please place C
L and CDD as close as to the VOUT and
VDD pins respectively and also close to the GND pin.
Strengthen the wiring sufficiently. RSENSE should be
removed and shorted when the C
L capacitor except for
ceramic or low ESR capacitor is used.
OFF ON Duty=25%, PWM/PFM automatic switching
OFF OFF PWM
By using external signals, the control of the XC9105 series can be
alternated between PWM control and PWM/PFM automatic switching
control. By inputting a voltage of more than V
pin, PWM control can be selected. On the other hand, PWM/PFM
automatic switching control can be selected by inputting a voltage of less
than V
With the XC9105, by connecting resistors of the same value (R
shown in the diagram to the left, it is possible to obtain chip disable with
S
CE ON and, SPWM ON or OFF, PWM/PFM auto switching at Duty=25%
with S
Note:
When operating at V
necessary to pull-up to V
V
CEH voltage level. Please make sure that the IC is in PWM control
(S
PWM=OFF) when operations start. If SPWM is ON, there are times when
Series
Insert RB and CB when using a bipolar
NPN Transistor.
SCE SPWM CONDITIONS
ON
DD -1.0V.
CE OFF & SPWM ON, & PFM control with both switches OFF.
－
DD -1.8V and below (stepping-up from VIN=0.9V), it is
DD in order to allow the CE/PWM pin reach the
Chip Disable
DD -0.2V to the CE/PWM
M1, RM2) as
chip enable might not operate.
6/23
* Please select your external components carefully.
XC9103/XC9104/XC9105
Series
■ OPERATIONAL EXPLANATION
The XC9103/04/05 series are step-up DC/DC converter controller ICs with built-in high speed, low ON resistance drivers.
<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 Controller>
This circuit generates PFM pulses.
The PWM/PFM automatic switching mode switches between PWM and PFM automatically depending on the load. The
PWM/PFM automatic switching mode is selected when the voltage of the CE pin is less than VDD - 1.0V, and the control
switches between PWM and PFM automatically depending on the load. PWM/PFM control turns into PFM control when
threshold voltage becomes lower than voltage of error amps. PWM control mode is selected when the voltage of the CE
pin is more than V
suitable for noise sensitive portable audio equipment as PWM control can suppress noise during operation and PWM/PFM
switching control can reduce consumption current during light load in stand-by.
<Vref 1 with Soft Start>
The reference voltage, Vref (FB pin voltage)=0.9V, is adjusted and fixed by laser trimming (for output voltage settings,
please refer to the notes on next page). 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 (C
the error amps, the operation maintains a balance between the two inputs of the error amps and controls the EXT pin's ON
time so that it doesn't increase more than is necessary.
<Enable Function>
This function controls the operation and shutdown of the IC. When the voltage of the CE pin is 0.2V or less, the mode will
be disable, the channel's operations will stop and the EXT1 pin will be kept at a low level (the external N-type MOSFET will
be OFF). When the IC is in a state of disable, current consumption will be no more than 1.0μA.
When the CE pin's voltage is 0.65V or more, the mode will be enabled and operations will recommence.
DD - 0.2V. Noise is easily reduced with PWM control since the switching frequency is fixed. The series is
L) from inrush current. With the Vref voltage limited and depending upon the input to
7/23
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