XC9210 Series
ETR0504_001
Synchronous Step-Down DC / DC Controller ICs
■GENERAL DESCRIPTION
The XC9210 is a synchronous PWM, PWM/PFM controller designed for low voltage step-down DC/DC converter applications.
High efficiency is obtained through the use of a synchronous rectification topology. Efficiencies are maximized by using the low
RDSon N-Channel MOSFET switch which replaces the catch diode used in standard buck circuits.
The operation of the XC9210 series can be switched between PWM and PWM/PFM externally using the MODE pin. In
PWM/PFM mode the XC9210 automatically switches from PWM to PFM during light loads and high efficiencies can be
achieved over a wide range of load conditions.
Output noise is reduced in PWM operation as the frequency is fixed.
The XC9210 has an 0.9V (±2.0%) internal voltage, and using externally connected components, the output voltage can be set freely
between 0.9V to 6.0V. With an internal switching frequency of 300kHz and 180kHz (custom) smaller, low cost external
components can also be used.
Soft-start time is internally set to 10msec offering protection against in-rush currents during start-up and preventing voltage overshoot.
■APPLICATIONS
●PDAs
●Palmtop computers
●Portable audios
●Various power supplies
■TYPICAL APPLICATION CIRCUIT
<XC9210B093K OUTPUT=3.3V>
■FEATURES
Input Voltage Range : 2.0V ~ 10V
Output Voltage Range : 0.9V ~ 6.0V
Oscillation Frequency : 300kHz ±15%
Output Current : More than 2A
Stand-By Function : 3.0μA (MAX. )
Soft-start internally set-up : 10 ms (internally set-up)
Synchronous Step-Down DC/DC Controllers
Maximum Duty Cycle : 100% (TYP.)
PWM and PWM/PFM Externally Selectable
Synchronous Rectification Control
High Efficiency : 95% (TYP.)
Package : MSOP-8A
■TYPICAL PERFORMANCE
CHARACERISTICS
Efficiency vs. Output Current
☆GO-Compatible
Can be set freely with 0.9V
(±2.0%) of reference
(180kHz as custom)
(VIN = 5.0V, VOUT=3.3V)
Tr1:Pch MOSFET
:CPH3308
C
IN
:47μF
EXT1
VDD
PWM
CE MODE
V
IN
:3.3V~10V
PWM
CE
EXT2
GND
FB
MODE
L:22μH
CDRH125
Tr2:Nch MOSFET
:CPH3408
CFB
:62pF
RFB1
:200kΩ
RFB
:75kΩ
CL:
47μFX2
OUT
:3.3V
V
1/12
XC9210 Series
■PIN CONFIGURATION
■PIN ASSIGNMENT
PIN NUMBER PIN NAME FUNCTIONS
1 EXT 1 /
2 VDD Supply Voltage
3 PWM
4 CE
5 MODE
6 FB
External Transistor Drive Pin
<Connected to High Side of P-ch Power MOSFET Gate>
PWM/PFM Switching Pin
<PWM control when connected to VDD, PWM / PFM auto switching when connected to
Ground. >
Chip Enable Pin
<Connected to Ground when output is stand-by mode. Connected to VDD when output is
active. EXT/1 is high and EXT2/ is low when in stand-by mode. >
Synchronous/Non-Synchronous Rectification Switching Pin
<Synchronous operation when MODE pin and PWM pin are connected to V
Non-Synchronous operation when MODE pin and PWM pin are connected to Ground.
Regardless of MODE pin, Non-Synchronous operation when PWM pin is connected to
Ground. >
Output Voltage Monitor Feedback Pin
<Threshold value: 0.9V. Output voltage can be set freely by connecting split resistors
between V
OUT and Ground.>
1 EXT1
2 VDD
3 PWM FB 6
4 CE MODE 8
MSOP-8A
(TOP VIEW)
EXT2 8
GND 7
DD,
7 GND Ground
8 EXT 2
■PRODUCT CLASSIFICATION
●Ordering Information
XC9210①②③④⑤⑥
DESIGNATOR DESCRIPTION SYMBOL DESCRIPTION
① Type of DC/DC Controller B : Standard type
② ③ Output Voltage 09 : FB Voltage: 0.9V
④ Oscillation Frequency
⑤ Package K : MSOP-8A
⑥ Devise Orientation
External Transistor Drive Pin
<Connected to Low side of N-ch Power MOSFET Gate>
2 : 180kHz (custom)
3 : 300kHz
R : Embossed tape, standard feed
L : Embossed tape, reverse feed
2/12
X
■ BLOCK DIAGRAM
■ ABSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL RATINGS UNITS
VDD Pin Voltage VDD - 0.3 ~ 12.0 V
FB Pin Voltage VFB - 0.3 ~ 12.0 V
CE Pin Voltage VCE - 0.3 ~ 12.0 V
PWM Pin Voltage VPWM - 0.3 ~ 12.0 V
MODE Pin Voltage VMODE - 0.3 ~ 12.0 V
EXT1, 2 Pin Voltage VEXT - 0.3 ~ VDD + 0.3 V
EXT1, 2 Pin Current IEXT ±100 mA
Power Dissipation Pd 150 mW
Operating Temperature Range Topr - 40 ~ + 85 ℃
Storage Temperature Range Tstg - 55 ~ +125 ℃
C9210
Series
Ta = 2 5 ℃
3/12
(
(
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C
62p
XC9210 Series
■ ELECTRICAL CHARACTERISTICS
XC9210B093
FOSC = 300kHz) Ta =2 5 ℃
PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
CIRCUIT
Supply Voltage VDD MODE = 0V 2.0 - 10.0 V ①
Maximum Input Voltage VIN MODE = 0V 10.0 - - V ①
Output Voltage Range
( *1)
VOUTSET
VIN≧2.0V, MODE = 0V,
I
OUT=1mA
OUT 0.9 - VIN V ①
V
Supply Current 1 IDD1 FB = 0V - 65 120 μA ②
Supply Current 2 IDD2 FB = 1.0V - 65 120 μA ②
Stand-by Current ISTB Same as IDD1, CE = 0V - - 3.0 μA ②
Oscillation Frequency FOSC Same as IDD1 255 300 345 kHz ②
FB Voltage VFB VIN=3.0V, IOUT=10mA 0.882 0.900 0.918 V ③
Minimum Operation Voltage VINmin - - 2.0 V ①
Maximum Duty Ratio MAXDTY Same as IDD1 100 - - % ②
Minimum Duty Ratio MINDTY Same as IDD2 - - 0 % ②
PFM Duty Ratio PFMDTY No Load, VPWM=0V 22 30 38 % ④
Efficiency1
(*2)
EFFI IOUT1=300mA
(*3)
- 96 - % ④
Soft-Start Time TSS VOUT1×0.95V, CE=0V→0.65V 5.0 10.0 20.0 ms ④
EXT1 "High" ON Resistance REXTBH1 CE1 = 0, EXT1= VDD - 0.4V - 26 37 Ω ⑤
EXT1 "Low" ON Resistance REXTBL1 FB = 0V, EXT1 = 0.4V - 19 30 Ω ⑤
EXT2 "High" ON Resistance REXTBH2 EXT2 = VDD - 0.4V - 23 31 Ω ⑤
EXT2 "Low" ON Resistance REXTBL2 CE = 0V, EXT2 = VDD - 0.4V - 19 30 Ω ⑤
PWM "High" Voltage VPWMH No Load 0.65 - - V ④
PWM "Low" Voltage VPWML No Load - - 0.20 V ④
MODE "High" Voltage VMODEH No Load 0.65 - - V ④
MODE "Low" Voltage VMOD EL No Load - - 0.20 V ④
CE "High" Voltage VCEH FB = 0V 0.65 - - V ②
CE "Low" Voltage VCEL FB = 0V - - 0.2 V ②
PWM "High" Current IPWMH - - 0.5 μA ②
PWM "Low" Current IPWML PWM=0V - - - 0.5 μA ②
MODE "High" Current IMODEH - - 0.5 μA ②
MODE "Low" Current IMODEL MODE = 0V - - - 0.5 μA ②
CE "High" Current ICEH - - 0.5 μA ②
CE "Low" Current ICEL CE = 0V - - - 0.5 μA ②
FB "High" Current IFBH - - 0.50 μA ②
FB "Low" Current IFBL FB = 1.0V - - - 0.50 μA ②
Unless otherwise stated, VDD = 3.0V, CE = 3.0V, PWM = 3.0V, FB = 3.0V, EXT1, 2=OPEN, MODE = 3.0V, VIN=4.2V
NOTE: *1： Please be careful not to exceed the breakdown voltage level of the peripheral parts.
*2： EFFI={ [ (output voltage) x (output current) ] / [ (input voltage) x (input current) ] } x 100
*3： Tr1: CPH3308 (SANYO)
Tr2: CPH3408 (SANYO)
L: 22μH
CL: 16V, 47μF x 2 (Tantalum MCE Series, NICHICEMI)
C
R
R
IN: 16V, 47μF (Tantalum MCE Series, NICHICEMI)
FB1: 200kΩ
FB2: 75kΩ
FB:
F
CDRH125, SUMIDA
4/12
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(
(
(
)
00
■ ELECTRICAL CHARACTERISTICS (Continued)
XC9210B092
(FOSC = 180kHz) Ta =2 5 ℃
C9210
Series
PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
Supply Voltage VDD MODE = 0V 2.0 - 10.0 V
Maximum Input Voltage VIN MODE = 0V 10.0 - - V
Output Voltage Range
(*1)
VOUTSET
VIN≧2.0V, MODE = 0V,
I
OUT=1mA
OUT 0.9 - VIN V ①
V
Supply Current 1 IDD1 FB = 0V - 45 105
Supply Current 2 IDD2 FB = 1.0V - 45 105
Stand-by Current ISTB Same as IDD1, CE = 0V - - 3.0
Oscillation Frequency FOSC Same as IDD1 153 180 207 kHz
FB Voltage VFB VIN=3.0V, IOUT=10mA 0.882 0.900 0.918 V
Minimum Operation Voltage VINmin - - 2.0 V
Maximum Duty Ratio MAXDTY Same as IDD1 100 - - %
Minimum Duty Ratio MINDTY Same as IDD2 - - 0 %
PFM Duty Ratio PFMDTY No Load, VPWM=0V 22 30 38 %
Efficiency1
(*2)
EFFI IOUT1=300mA
(*3)
- 96 - %
Soft-Start Time TSS VOUT1×0.95V, CE=0V→0.65V 5.0 10.0 20.0 ms
EXT1 "High" ON Resistance REXTBH1 CE1 = 0, EXT1= VDD - 0.4V - 26 37 Ω
EXT1 "Low" ON Resistance REXTBL1 FB = 0V, EXT1 = 0.4V - 19 30 Ω
EXT2 "High" ON Resistance REXTBH2 EXT2 = VDD - 0.4V - 23 31 Ω
EXT2 "Low" ON Resistance REXTBL2 CE = 0V, EXT2 = VDD - 0.4V - 19 30 Ω
PWM "High" Voltage VPWMH No Load 0.65 - - V
PWM "Low" Voltage VPWML No Load - - 0.20 V
MODE "High" Voltage VMODEH No Load 0.65 - - V
MODE "Low" Voltage VMODEL No Load - - 0.20 V
CE "High" Voltage VCEH FB = 0V 0.65 - - V
CE "Low" Voltage VCEL FB = 0V - - 0.20 V
PWM "High" Current IPWMH - - 0.50
PWM "Low" Current IPWML PWM=0V - - - 0.50
MODE "High" Current IMODEH - - 0.50
MODE "Low" Current IMODEL MODE = 0V - - - 0.50
CE "High" Current ICEH - - 0.50
CE "Low" Current ICEL CE = 0V - - - 0.50
FB "High" Current IFBH - - 0.50
FB "Low" Current IFBL FB = 1.0V - - - 0.50
Unless otherwise stated, VDD = 3.0V, CE = 3.0V, PWM = 3.0V, FB = 3.0V, EXT1,2 = OPEN, MODE = 3.0V, VIN=4.2V
NOTE: *1 : Please be careful not to exceed the breakdown voltage level of the peripheral parts.
*2 : EFFI={ [ (output voltage) x (output current) ] / [ (input voltage) x (input current) ] } x 100
*3 : Tr1: CPH3308
Tr2: CPH3408
L:
C
CIN:
R
R
C
22μH
L:
16V, 47μF x 2
16V, 47μF
FB1:
2
FB2:
kΩ
75kΩ
FB: 62pF
SANYO)
SANYO)
(CDRH125, SUMIDA)
Tantalum MCE Series, NICHICEMI
(Tantalum MCE Series, NICHICEMI)
CIRCUIT
①
①
μA ②
μA ②
μA ②
②
③
①
②
②
④
④
④
⑤
⑤
⑤
⑤
④
④
④
④
②
②
μA ②
μA ②
μA ②
μA ②
μA ②
μA ②
μA ②
μA ②
5/12
XC9210 Series
■ OPERATIONAL EXPLANATION
The XC9210 series are 2 channel step-down DC/DC converter controller ICs with built-in high speed, low ON resistance
drivers.
<Error Amp>
The error amplifier is designed to monitor the output voltage and it compares the feedback voltage (FB) with the reference
voltage. In response to feedback of a voltage lower than the reference voltage, the output voltage of the error amp.
decreases.
<OSC Generator>
This circuit generates the oscillation frequency, which in turn generates the source clock.
<Ramp Wave Generator>
The ramp wave generator generates a saw-tooth waveform based on outputs from the phase shift 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.
Control can be switched between PWM control and PWM/PFM automatic switching control using external signals.
The PWM/PFM automatic switching mode is selected when the voltage of the PWM pin is less than 0.2V, and the control
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. PWM control mode is selected when the
voltage of the PWM pin is more than 0.65V. Noise is easily reduced with PWM control since the switching frequency is fixed.
Control suited to the application can easily be selected which is useful in audio applications, for example, where traditionally,
efficiencies have been sacrificed during stand-by as a result of using PWM control (due to the noise problems associated
with the PFM mode in stand-by).
<Synchronous, blank logic>
The Synchronous, blank logic circuit is to prevent penetration of the transistor connected to EXT1 and EXT2. Synchronous
can be switched between Synchronous rectification and Non-Synchronous rectification automatically by using external
signals. When the MODE pin's voltage is 0.2V or less, the mode will be non-synchronous rectification and operations will
recommence. The EXT2 pin will be kept at a low level (the external N-type MOSFET will be OFF). When the MODE pin's
and PWM pin's voltage is 0.65V or more, the mode will be synchronous rectification and operations will recommence.
<Vref 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 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
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.
<Chip 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 chip disable, the channel's operations will stop. The EXT1 pin will be kept at a high level (the external P-ch MOSFET
will be OFF) and the EXT2 pin will be kept at a low level (the external N-ch MOSFET will be OFF). When CE pin is in a
state of chip disable, current consumption will be no more than 3.0μA.
When the CE pin's voltage is 0.65V or more, the mode will be chip enable and operations will recommence. With soft-start,
95% of the set output voltage will be reached within 10mS (TYP.) from the moment of chip enable.
L) from inrush current. With the Vref voltage limited and depending upon the input to the error amps, the
6/12
X
C9210
Series
■ OPERATIONAL EXPLANATION (Continued)
< Output Voltage Setting >
Output voltage can be set by adding external split resistors. Output voltage is determined by the following equation, based
on the values of R
less.
The value of C
equal to 12kHz. Adjustments are required from 1kHz to 50kHz depending on the application, value of inductance (L), and
value of load capacity (C
[Example of Calculation]
V
[Typical Example]
FB11 (RFB21) and RFB12 (RFB22). The sum of RFB11 (RFB21) and RFB12 (RFB22) should normally be 1 MΩ or
OUT = 0.9
×
( RFB11 + RFB12 ) / RFB12
FB1(CFB2), speed-up capacitor for phase compensation, should be fzfb= 1 / (2
L).
×π×
CFB1×RFB11) which is
When RFB11 = 200kΩ and RFB12 = 75kΩ, VOUT1 = 0.9×( 200k + 75k ) / 75k = 3.3V.
VOUT
(V)
RFB11
(kΩ)
RFB12
(kΩ)
CFB1
(pF)
VOUT
(V)
RFB11
(kΩ)
RFB12
(kΩ)
CFB1
(pF)
1.2 110 330 100 2.5 390 220 33
1.5 220 330 62 2.7 360 180 33
1.8 220 220 62 3.0 560 240 24
2.0 330 270 39 3.3 200 75 62
2.2 390 270 33 5.0 82 18 160
[External Components]
Transistor :
●Low Input Voltage (2.0V ≦ VIN ≦ 5.0V, IOUT ≦ 2A)
EXT1:
EXT2:
●High Input Voltage (5.0V ≦ V
EXT1:
EXT2:
CPH6315 (P-ch MOSFET: SANYO), IRLMS6702 (P-ch MOSFET: IR)
CPH3409 (N-ch MOSFET: SANYO), IRLMS1902 (P-ch MOSFET: IR)
IN ≦ 10.0V, IOUT ≦ 2A)
CPH3308 (P-ch MOSFET: SANYO), IRLMS5703 (P-ch MOSFET: IR)
CPH3408 (N-ch MOSFET: SANYO), IRLMS1503 (P-ch MOSFET: IR)
L : 22μH (CDRH125, SUMIDA) C
IN: 16V, 47μF (Tantalum MCE Series, NICHICEMI)
CL: 16V, 47μF x 2 (Tantalum MCE Series, NICHICEMI) SD: CMS02 (Schottky Barrier Diode, TOSHIBA)
■EXTERNAL COMPONENTS
●COIL
PART NU MBE R
CDR125-220 SUMIDA 22 36m 2.8 12.3×12.3 6.0
●INPUT / OUTPUT CAPACITANCE
PART NU MBE R
16MCE476MD2 NICHICHEMI 16.0 47 4.6×5.8 3.2±0.2
●SCHOTTKY BARRIER DIODE
PART NU MBE R
CMS02 TOSHIBA 30 3 0.4 (IF=3A) 0.5m (VR=30V) 2.4×4.7 0.98±0.1
●TRANSISTOR (P-ch MOSFET)
PART
NUMBER
CPH6315 SANYO - 20 ±10 - 3.0 150 (Vgs= -4.0V) 410 (Vds= -10V) - 1.4 (MAX.) CPH6
CPH3308 SANYO - 30 ±20 - 4.0 140 (Vgs= -4.0V) 560 (Vds= -10V) - 2.4 (MAX.) CPH3
IRLMS6702 IR - 20 ±12 - 2.3 200 (Vgs= -4.5V) 210 (Vds= -15V) - 0.7 (MAX.) Micro6
IRLMS5703 IR - 30 ±20 - 2.3 400 (Vgs= -4.5V) 170 (Vds= -25V) - 1.0 (MAX.) Micro6
●TRANSISTOR (N-ch MOSFET)
PART
NUMBER
CPH3409 SANYO 30 ±10 5.0 42 (Vgs=4.0V) 630 (Vds= 10V) 1.3 (MAX.) CPH6
CHP3408 SANYO 30 ±20 5.0 68 (Vgs=4.0V) 480 (Vds= 10V) 2.4 (MAX.) CPH3
IRLMS1902 IR 20 ±12 3.2 100 (Vgs=4.5V) 300 (Vds= 15V) 0.7 (MAX.) Micro6
IRLMS1503 IR 30 ±20 3.2 200 (Vgs=4.5V) 210 (Vds= 25V) 1.0 (MAX.) Micro6
MANUFACTURER
MANUFACTURER
MANUFACTURER
MANUFACTURER
MANUFACTURER
L VALUE
(μH)
VOLTAGE (V) CAPACITANCE (μF) W x L (mm) H (mm)
REVERSE
CURRENT
ABSOLUTE MAX. RATINGS
VDSS (V) VGSS (V) ID (A)
ABSOLUTE MAX. RATINGS
VDSS (V) VGSS (V) ID (A)
SERIAL
RESISTANCE (Ω)
FORWARD
CURRENT
RATED CURRENT
(A)
W x L (mm)
H (mm)
VFmax (V) IRmax (A) W x L (mm) H (mm)
RDS (ON)
MAX.(mΩ)
RDS (ON)
MAX.(mΩ)
Ciss (TYP.) (pF) VGS (off) (V) PKG.
Ciss (TYP.) (pF) VGS (off) (V) PKG.
7/12
XC9210 Series
■TEST CIRCUITS
Circuit ① :
L: 22μH (CDRH125, SUMIDA)
C
L: 16MCE476MD2 (Tantalum Type, NIHONCHEMICON)
IN: 16MCE476MD2 (Tantalum Type, NIHONCHEMICON)
C
PNP Tr 1: 2SA1213 (TOSHIBA)
Tr 2: CPH3409 (SANYO)
R
FB: Please use by the conditions as below.
R
R
FB: fztb = 1 / (2 x π x CFB x RFB1) =1kHz ~ 50kHz (12kHz usual)
C
Circuit ③ :
L: 22μH (CDRH125, SUMIDA)
CL: 16MCE476MD2 (Tantalum Type, NIHONCHEMICON)
IN: 16MCE476MD2 (Tantalum Type, NIHONCHEMICON)
C
Tr 1: CPH6315 (SANYO)
Tr 2: CPH3409 (SANYO)
Circuit ④ :
L: 22μH (CDRH125, SUMIDA)
CL: 16MCE476MD2 (Tantalum Type, NIHONCHEMICON)
IN: 16MCE476MD2 (Tantalum Type, NIHONCHEMICON)
C
Tr 1: CPH3308 (SANYO)
Tr 2: CPH3409 (SANYO)
FB1 + RFB2 ≦1MΩ
FB1 / RFB2 = (Setting Output Voltage / 0.9) -1
8/12
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■NOTES ON USE
1. Checking for Intermittent Oscillation
The XC9210 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 C
and use OS-CON for the load capacitance C
low, the series could produce an abnormal oscillation. In such case, please test with the actual device.
2. PWM/PFM Automatic Switching
If PWM/PFM automatic switching control is selected and the step-down ratio is high (e.g., from 10 V to 1.0 V), the control mode
remains in PFM setting over the whole load range, since the duty ratio under continuous-duty condition is smaller than the PFM
duty ratio of the XC9210 series. The output voltage's ripple voltage becomes substantially high under heavy load conditions,
with the XC9210 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 I
3. Ratings
Use the XC9210 series and peripheral components within the limits of their ratings.
4. Reverse Current
Reverse current is produced under the
conditions of synchronous operation and light
load (current flows from the output to the input).
If this reverse current becomes a concern,
operate under synchronous rectification during
heavy load conditions, or move input
capacitance C
reverse current to the power supply.
* The light load condition mentioned above means that the load current when the coil current being discontinuous at
non-synchronous operation. The heavy load condition means that the load current when the coil current being continuous at
non-synchronous operation. The DC/DC simulation on the TOREX website is useful to determine whether the coil current is
non-synchronous or synchronous under your operating conditions. After the simulation, please test with the actual device.
Coil current when non-synchronous
Comparison among non-synchronous operation (left), synchronous operation (center) and the coil current on a
like-for-like basis. Synchronous of the current IL< 0mA becomes reverse current.
To prevent the reverse current, operate in the condition of I
5. Switching Method of Operational Mode / Control
IN closer to the IC to reduce the
(DiscontinuousMode)
PWM MODE OPERATIONAL MODE / CONTROL
'H' 'H' Synchronous, PWM Control
'H' 'L' Non-Synchronous, PWM Control
'L' 'H' Non-Synchronous, PFM / PWM Automatic Switching Control
'L' 'L' Non-Synchronous, PFM / PWM Automatic Switching Control
L. When using OS-CON for the load capacitance and setting output voltage
OUT = 100 mA.
Coil current when synchronous Coil curren
Lmin > 0mA (right).
C9210
Series
L
9/12
XC9210 Series
■NOTES ON USE (Continued)
6. Notes on How to Select Transistor
Synchronous rectification operation prepares fixed time when switching changes so that the high side P-ch MOSFET and
the low side N-ch MOSFET do not oscillate simultaneously. Also it is designed to prevent the penetration current when the
both MOSFET oscillate at the same time. However, some MOSFET may oscillate simultaneously and worsen efficiency.
Please select MOSFET with high Vth with small input capacity on high side P-ch MOSFET and the low side N-ch MOSFET.
(When using with large current, please note that there is a tendency for ON resistance to become large when the input
capacity of MOSFET is small and Vth is high.)
7. Instruction on Layout
(1) The performance of the XC9120 DC/DC converter is greatly influenced by not only its own characteristics, but also by
■TYPICAL APPLICATION CIRCUIT
10/12
those of the external components it is used with. We recommend that you refer to the specifications of each
component to be used and take sufficient care when selecting components.
(2) Please mount each external component as close to the IC as possible. Wire external components as close to the IC
as possible and use thick, short connecting wires to reduce wiring impedance. In particular, minimize the distance
between the EXT pin and the Gate pin of the low side of N-ch MOSFET.
(3) Make sure that the GND wiring is as strong as possible as variations in ground potential caused by ground current at
the time of switching may result in unstable operation of the IC. Specifically, strengthen the ground wiring in the
proximity of the V
SS pin.
(4) For stable operation, please connect by-pass capacitor between the V
Tr1:Pch MO SFET
CIN
EX T1
VDD
PWM
CE MODE
VIN
PW M
CE
Lx Pin
Tr2:Nch M OSFET
SBD
CF B
EXT2
GND
FB
MODE
DD and the GND.
L
RF B1
RF B2
VOU T
CL
X
■ PACKAGING INFORMATION
●MSOP-8A
■ MARKING RULE
●MSOP-8A
① Represents product series
② Represents type of DC/DC Controller
MSOP-8A
(TOP VIEW)
③,④ Represents FB voltage
MARK
③ ④
0 9 0.9 XC9210B09xKx
⑤ Represents oscillation frequency
MARK OSCILLATION FREQUENCY (kHz) PRODUCT SERIES
⑥ Represents production lot number
0 to 9,A to Z repeated (G, I, J, O, Q, W excepted)
Note: No character inversion used.
C9210
Series
MARK PRODUCT SERIES
5 XC9210B09xKx
MARK PRODUCT SERIES
B XC9210B09xKx
VOLTAGE
（V）
2 180 (Custom) XC9210B092Kx
3 300 XC9210B093Kx
PRODUCT SERIES
11/12
XC9210 Series
1. The products and product specifications contained herein are subject to change without
notice to improve performance characteristics. Consult us, or our representatives
before use, to confirm that the information in this catalog is up to date.
2. We assume no responsibility for any infringement of patents, patent rights, or other
rights arising from the use of any information and circuitry in this catalog.
3. Please ensure suitable shipping controls (including fail-safe designs and aging
protection) are in force for equipment employing products listed in this catalog.
4. The products in this catalog are not developed, designed, or approved for use with such
equipment whose failure of malfunction can be reasonably expected to directly
endanger the life of, or cause significant injury to, the user.
(e.g. Atomic energy; aerospace; transport; combustion and associated safety
equipment thereof.)
5. Please use the products listed in this catalog within the specified ranges.
Should you wish to use the products under conditions exceeding the specifications,
please consult us or our representatives.
6. We assume no responsibility for damage or loss due to abnormal use.
7. All rights reserved. No part of this catalog may be copied or reproduced without the
prior permission of Torex Semiconductor Ltd.
12/12
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