XC9208A213ML 概述
Switching Regulator/Controller 开关式稳压器或控制器
XC9208A213ML 规格参数
是否Rohs认证: | 符合 | 生命周期: | Obsolete |
包装说明: | , | Reach Compliance Code: | compliant |
风险等级: | 5.84 | 湿度敏感等级: | 1 |
Base Number Matches: | 1 |
XC9208A213ML 数据手册
通过下载XC9208A213ML数据手册来全面了解它。这个PDF文档包含了所有必要的细节,如产品概述、功能特性、引脚定义、引脚排列图等信息。
PDF下载XC9206/XC9207/XC9208Series
ETR0503_001
PWM, PWM / PFM Switchable Step-Down
DC / DC Converters With Driver Transistor Built-In
☆GO-Compatible
■GENERAL DESCRIPTION
The XC9206/XC9207/XC9208 series is a group of DC/DC converters with a built-in 0.4Ω P-channel driver transistor, offered
in a SOT-25 package. The ICs are designed to provide high efficiencies and a stable power supply with an output current of
500mA using only a coil, a diode and two ceramic capacitors connected externally.
Minimum operating voltage of the XC9206/9207 is 1.8V and 2.0V for XC9208. Output voltage is internally programmable in
a range from 0.9V to 4.0V in 100mV increments (accuracy: ±2.0%). Oscillation frequency is selectable from 300kHz, 600kHz
and 1.2MHz so that the frequency best suited to your particular application can be selected. Each series features different
operation modes: PWM control (XC9206 series), automatic PWM/PFM switching control (XC9207 series) and manual
PWM/PFM switching control (XC9208 series). The series gives fast transient response, low ripple and high efficiency over
the full range of load (from light load to high output current conditions). The soft start and current control functions are
internally optimized. During stand-by, all circuits are shutdown to reduce current consumption to as low as 1.0μA or less.
With the built-in U.V.L.O. (Under Voltage Lock Out) function, the internal P-channel driver transistor is forced OFF when input
voltage becomes 1.4V or lower.
■FEATURES
P-ch driver Tr. Built-in
Output Voltage Range
■APPLICATIONS
●Mobile phones
: ON resistance 0.4Ω
: 0.9V ~ 4.0V
(PDC, GSM, CDMA, IMT2000 etc.)
●PDAs, Portable communication modems
●Portable games
(100mV increments)
Fixed output voltage accuracy ±2%
Oscillation Frequency
: 300kHz, 600kHz, 1.2MHz
Fixed oscillation frequency
Accuracy ±15%
●Cameras, digital cameras
●Cordless phones
Stand-by function
: Istb = 1μA (MAX.)
: 600mA
●Note book computers
Current Limiter built-in
Input Voltage Range
: 1.8V ~ 6.0V(XC9206/XC9207)
2.0V ~ 6.0V (XC9208)
: 500mA
Output Current
Maximum Duty Ratio
: 100%
PWM/PFM Switching Control (XC9207 / XC9208)
Ceramic Capacitor Compatible
Soft start circuit built-in
Small Package
: SOT-25
■TYPICAL APPLICATION CIRCUIT
■TYPICAL PERFORMANCE
CHARACTERISTICS
●Efficiency vs. Output Current
XC9208A18C
VOUT=1.8V (Oscillation Frequency 1.2MHz)
CIN:4.7μF,CL:10μF, L:4.7μH(CDRH3D16),
SD:CRS02, Topr=25℃
CE/MODE
VOUT
CE/
3
4
5
MODE
100
PWM/PFM
Switching Control
VSS
Lx
90
2
1
VOUT
(500mA)
80
70
L
VIN
VIN=2.4V
VIN
3.6V
60
CL
(ceramic)
50
4.2V
CIN
(ceramic)
SD
40
PWM Control
30
20
10
0
L
:4.7μF (CDRH 3D16,SUMIDA)
0.1
1
10
100
1000
SD :CRS02 (SCHOTTKY DIODE,TOSHIBA)
CL :10μF (ceramic)
Output Current IOUT (mA)
CIN :4.7μF (ceramic)
1/15
XC9206/XC9207/XC9208 Series
■PIN ASSIGNMENT
■PIN CONFIGURATION
PIN NUMBER PIN NAME
FUNCTION
VIN
CE/MODE
1
2
3
4
5
LX
VSS
Switching Output
Ground
VOUT
Output Voltage Sense
CE/MODE Chip Enable/Mode Switch
Power Input
VIN
Lx
VSS VOUT
SOT-25
(TOP VIEW)
■PRODUCT CLASSIFICATION
●Ordering Information
XC9206①②③④⑤⑥: PWM Control
XC9207①②③④⑤⑥: PWM / PFM Automatic Switching Control
XC9208①②③④⑤⑥: PWM Control, PWM / PFM Automatic Switching Control Manually Selectable
DESIGNATOR
DESCRIPTION
SYMBOL
A
DESCRIPTION
: 600mA current limiter, Transistor built-in, output voltage
internally set (VOUT product), soft start internally set.
①
Type of DC/DC Converter
: 100mV increments
09~40
e.g. VOUT=1.5V→②=1, ③=5
②③
④
Output Voltage
: 1.85V VOUT →②=1, ③=L
2.85V VOUT →②=2, ③=L
09~40 & L
3
6
: 300kHz
: 600kHz
: 1.2MHz
Oscillation Frequency
C
⑤
⑥
Package
M
R
L
: SOT-25 (SOT-23-5)
: Embossed tape, standard feed
: Embossed tape, reverse feed
Device Orientation
* Output voltage 0.9V ~ 4.0V (100mV increments), 1.85V and 2.85V are standard products.
Output voltage other than these are available as semi-custom products.
2/15
XC9206/XC9207/XC9208
Series
■BLOCK DIAGRAM
Note: The signal from CE/MODE Control Logic to PWM/PFM Selector is being fixed to "L" level inside, and XC9206 series chooses
PWM control.
The signal from CE/MODE Control Logic to PWM/PFM Selector is being fixed to "H" level inside, and XC9207 series chooses
only PWM/PFM automatic switching control.
■ABSOLUTE MAXIMUM RATINGS
Ta=25℃
PARAMETER
VIN Pin Voltage
SYMBOL
VIN
RATINGS
- 0.3 ~ + 6.5
- 0.3 ~ + 6.5
- 0.3 ~ VIN + 0.3
- 0.3 ~ + 6.5
- 0.3 ~ VIN + 0.3
± 1000
UNITS
V
VSS Pin Voltage
VSS
V
Lx Pin Voltage
VLx
V
VOUT Pin Voltage
VOUT
VCE
ILx
V
CE / MODE Pin Voltage
Lx Pin Current
V
mA
mW
℃
Power Dissipation
Pd
250
Operating Temperature Range
Storage Temperature Range
Topr
Tstg
- 40 ~ + 85
- 55 ~ + 125
℃
3/15
XC9206/XC9207/XC9208 Series
■ELECTRICAL CHARACTERISTICS
XC9206A18CMR, XC9207A18CMR, XC9208A18CMR
VOUT=1.8V, FOSC=1.2MHz, Ta=25℃
CIRCUIT
PARAMETER
Output Voltage
SYMBOL
CONDITIONS
MIN. TYP. MAX. UNIT
When connected to ext. components
CE=VIN, IOUT=30mA
VOUT
1.764 1.800 1.836
V
V
①
①
(XC9206, 9207) 1.8
(XC9208) 2.0
When connected to ext. components 500
-
-
6.0
6.0
Operating Voltage Range
Maximum Output Current
U.V.L.O. Voltage
VIN
IOUTMAX
-
-
mA
V
①
②
CE=VIN, VOUT=0V,
Voltage which Lx pin voltage holding "L"
level (*1)
VUVLO
1.00 1.40 1.78
Supply Current 1
Supply Current 2
Stand-by Current
IDD1
IDD2
ISTB
CE=VIN, VOUT=fixed voltage x 0.9V
CE=VIN, VOUT=fixed voltage x 1.1V
CE=VSS, VOUT=fixed voltage x 1.1V
-
-
-
255
98
0
413
158
1
μA
μA
μA
③
③
③
When connected to ext. components
CE=VIN, IOUT=30mA
Oscillation Frequency
FOSC
1.020 1.200 1.380 MHz
①
When connected to ext. components
(XC9207, XC9208 only), CE=VIN,
IOUT=1mA
PFM Pulse Width Rate
PFMDTY
24
30
36
0
%
①
Maximum Duty Cycle
Minimum Duty Cycle
MAXDTY CE=VIN, VOUT=0V
100
-
-
-
%
%
②
②
MINDTY
CE=VOUT=VIN
When connected to ext. components,
CE=VIN, IOUT=100mA
Efficiency (*2)
EFFI
-
86
%
①
Lx SW ON Resistance
Current Limit
RLx
ILIM
CE=VIN, VOUT=0V, ILx=400mA (*3)
VIN=CE=5.0V, VOUT=0V
-
-
0.4
0.9
-
Ω
④
④
600
mA
VOUT=0V, When CE
voltage is applied Lx
determine "H"
(XC9206, 9207) 1.2
(XC9208) 0.9
-
-
VIN
VIN
CE "H" Voltage
VCEH
V
⑤
VOUT=0V, When CE voltage is applied Lx
determine "L"
CE "L" Voltage
PWM "H" Voltage
PWM "L" Voltage
VCEL
VSS
VIN-0.3
-
-
-
-
0.3
-
V
V
V
⑤
①
①
When connected to ext. components
(XC9208 only), IOUT=1mA (*4)
VPWMH
VPWML
When connected to ext. components
(XC9208 only), IOUT=1mA (*4)
VIN-1.0
CE "H" Current
CE "L" Current
ICEH
ICEL
CE=VIN=5.5V, VOUT=0V
-0.1
-0.1
-
-
0.1
0.1
μA
μA
⑤
⑤
CE=0V, VIN=5.5V, VOUT=0V
When connected to ext. components
CE=0V → VIN, IOUT=1mA
Soft-Start Time
TSS
0.8
-
6.0
ms
①
When connected to ext. components
VIN=CE=5.0V, short VOUT by 1Ω
resistance (*5)
Latch Time
Tlat
-
-
12.0
ms
⑥
Test condition: Unless otherwise stated, VIN = 3.6V
NOTE:
*1: Including hysteresis operating voltage range.
*2: EFFI = [ (output voltage x output current) / (input voltage x input current) ] x 100
*3: On resistance = VLx (measurement voltage) / 0.4
*4: The CE/MODE pin of the XC9208A series works also as an external PWM control and PWM/PFM control switching pin. When the
IC is in the operation, control is switched to the PWM mode when the CE/MODE pin voltage is equal to or greater than VIN minus 0.3
V, and to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0 V and
equal to or greater than VCEH.
*5: Time until it short-circuits VOUT with GND through 1Ωof resistance from a state of operation and is set to VOUT=0V from current limit
pulse generating.
4/15
XC9206/XC9207/XC9208
Series
■ELECTRICAL CHARACTERISTICS (Continued)
XC9206A25CMR, XC9207A25CMR, XC9208A25CMR
VOUT=2.5V, FOSC=1.2MHz, Ta=25℃
PARAMETER
Output Voltage
SYMBOL
CONDITIONS
MIN. TYP. MAX. UNIT CIRCUIT
When connected to ext. components
CE=VIN, IOUT=30mA
VOUT
2.450 2.500 2.550
V
①
(XC9206, 9207)
(XC9208)
When connected to ext. components
1.8
2.0
-
-
-
6.0
6.0
-
Operating Voltage Range
Maximum Output Current
VIN
V
①
①
IOUTMAX
500
mA
CE=VIN, VOUT=0V,
Voltage which Lx pin voltage holding "L"
U.V.L.O. Voltage
VUVLO
1.00 1.40 1.78
V
②
level (*1)
Supply Current 1
Supply Current 2
Stand-by Current
IDD1
IDD2
ISTB
CE=VIN, VOUT=fixed voltage x 0.9V
CE=VIN, VOUT=fixed voltage x 1.1V
CE=VSS, VOUT=fixed voltage x 1.1V
-
-
-
255
98
0
413
158
1
μA
μA
μA
③
③
③
When connected to ext. components
CE=VIN, IOUT=30mA
Oscillation Frequency
FOSC
1.020 1.200 1.380 MHz
①
When connected to ext. components
PFM Pulse Width Rate
PFMDTY (XC9207, XC9208 only), CE=VIN,
24
30
36
0
%
①
IOUT=1mA
Maximum Duty Cycle
Minimum Duty Cycle
MAXDTY CE=VIN, VOUT=0V
100
-
-
-
%
%
②
②
MINDTY
EFFI
CE=VOUT=VIN
When connected to ext. components,
CE=VIN, IOUT=100mA
Efficiency (*2)
-
91
%
①
Lx SW ON Resistance
Current Limit
RLx
ILIM
CE=VIN, VOUT=0V, ILx=400mA (*3)
VIN=CE=5.0V, VOUT=0V
-
-
0.4
600
-
0.9
-
Ω
④
④
mA
VOUT=0V, When CE
voltage is applied Lx
determine "H"
(XC9206, 9207)
(XC9208)
1.2
VIN
CE "H" Voltage
VCEH
V
⑤
0.9
-
-
VIN
0.3
VOUT=0V, When CE voltage is applied Lx
determine "L"
CE "L" Voltage
PWM "H" Voltage
PWM "L" Voltage
VCEL
VSS
V
V
V
⑤
①
①
When connected to ext. components
(XC9208 only), IOUT=1mA (*4)
VPWMH
VPWML
VIN-0.3
-
-
-
-
When connected to ext. components
(XC9208 only), IOUT=1mA (*4)
VIN-1.0
CE "H" Current
CE "L" Current
ICEH
ICEL
CE=VIN=5.5V, VOUT=0V
-0.1
-0.1
-
-
0.1
0.1
μA
μA
⑤
⑤
CE=0V, VIN=5.5V, VOUT=0V
When connected to ext. components
CE=0V →VIN, IOUT=1mA
Soft-Start Time
TSS
0.8
-
6.0
ms
①
When connected to ext. components
VIN=CE=5.0V, short VOUT by 1Ω
resistance (*5)
Latch Time
Tlat
-
-
12.0
ms
⑥
Test condition : Unless otherwise stated, VIN = 3.6V
NOTE:
*1 : Including hysteresis operating voltage range.
*2 : EFFI = [ (output voltage x output current) / (input voltage x input current) ] x 100
*3 : On resistance = VLX (measurement voltage) / 0.4
*4 : The CE/MODE pin of the XC9208A series works also as an external PWM control and PWM/PFM control switching pin. When the
IC is in the operation, control is switched to the PWM mode when the CE/MODE pin voltage is equal to or greater than VIN minus 0.3
V, and to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0 V and
equal to or greater than VCEH.
*5 : Time until it short-circuits VOUT with GND through 1Ω of resistance from a state of operation and is set to VOUT=0V from current
limit pulse generating.
5/15
XC9206/XC9207/XC9208 Series
■ELECTRICAL CHARACTERISTICS (Continued)
XC9206A33CMR, XC9207A33CMR, XC9208A33CMR
VOUT=3.3V,FOSC=1.2MHz, Ta=25℃
PARAMETER
Output Voltage
SYMBOL
CONDITIONS
MIN. TYP. MAX. UNIT CIRCUIT
When connected to ext. components
CE=VIN, IOUT=30mA
VOUT
3.234 3.300 3.366
V
①
(XC9206, 9207) 1.8
(XC9208) 2.0
When connected to ext. components 500
CE=VIN, VOUT=0V,
-
-
-
6.0
6.0
-
Operating Voltage Range
Maximum Output Current
VIN
V
①
①
IOUTMAX
mA
U.V.L.O. Voltage
VUVLO
Voltage which Lx pin voltage holding "L" 1.00 1.40 1.78
level (*1)
V
②
Supply Current 1
Supply Current 2
Stand-by Current
IDD1
IDD2
Istb
CE=VIN, VOUT=fixed voltage x 0.9V
CE=VIN, VOUT=fixed voltage x 1.1V
CE=VSS, VOUT=fixed voltage x 1.1V
-
-
-
370
120
0
585
180
1
μA
μA
μA
③
③
③
When connected to ext. components
CE=VIN, IOUT=30mA
Oscillation Frequency
FOSC
1.020 1.200 1.380 MHz
①
When connected to ext. components
PFM Pulse Width Rate
PFMDTY (XC9207, XC9208 only),
26
32
38
0
%
①
CE=VIN, IOUT=1mA
Maximum Duty Cycle
Minimum Duty Cycle
MAXDTY CE=VIN, VOUT=0V
MINDTY CE=VOUT=VIN
100
-
-
-
%
%
②
②
When connected to ext. components,
CE=VIN, IOUT=100mA
Efficiency (*2)
EFFI
-
92
%
①
Lx SW ON Resistance
Current Limit
RLx
ILIM
CE=VIN, VOUT=0V, ILx=400mA (*3)
VIN=CE=5.0V, VOUT=0V
-
0.4
600
-
0.9
-
Ω
④
④
-
mA
VOUT=0V, When CE
voltage is applied Lx
determine "H"
(XC9206, 9207) 1.2
VIN
CE "H" Voltage
CE "L" Voltage
VCEH
VCEL
V
V
⑤
⑤
(XC9208) 0.9
-
-
VIN
0.3
VOUT=0V, When CE voltage is applied
Lx determine "L"
VSS
When connected to ext. components
(XC9208 only), IOUT=1mA (*4)
PWM "H" Voltage
PWM "L" Voltage
VPWMH
VPWML
VIN-0.3
-
-
-
-
V
V
①
①
When connected to ext. components
(XC9208 only), IOUT=1mA (*4)
VIN-1.0
CE "H" Current
CE "L" Current
ICEH
ICEL
CE=VIN=5.5V, VOUT=0V
-0.1
-0.1
-
-
0.1
0.1
μA
μA
⑤
⑤
CE=0V, VIN=5.5V, VOUT=0V
When connected to ext. components
CE=0V → VIN, IOUT=1mA
Soft Start Time
TSS
0.8
-
6.0
ms
①
When connected to ext. components
VIN=CE=5.0V, short VOUT by 1Ω
resistance (*5)
Latch Time
Tlat
-
-
12.0
ms
⑥
Test condition: Unless otherwise stated, VIN = 5.0V
NOTE:
*1: Including hysteresis operating voltage range.
*2: EFFI = [ (output voltage x output current) / (input voltage x input current) ] x 100
*3: On resistance = VLX (measurement voltage) / 0.4
*4: The CE/MODE pin of the XC9208A series works also as an external PWM control and PWM/PFM control switching pin. When the
IC is in the operation, control is switched to the PWM mode when the CE/MODE pin voltage is equal to or greater than VIN minus 0.3
V, and to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0 V and
equal to or greater than VCEH.
*5: Time until it short-circuits VOUT with GND through 1Ω of resistance from a state of operation and is set to VOUT=0V from current limit
pulse generating.
6/15
XC9206/XC9207/XC9208
Series
■TYPICAL APPLICATION CIRCUIT
●FOSC=1.2MHz
: 4.7μH (CDRH3D16,
SUMIDA)
SD : CRS02 (TOSHIBA)
CIN : 4.7μF (Ceramic)
CL : 10μF (Ceramic)
●FOSC=600kHz
CE/MODE
VOUT
CE/
3
4
L
L
: 10μH
(CDRH4D18C,
SUMIDA)
MODE
VSS
Lx
SD : CRS02 (TOSHIBA)
CIN : 4.7μF (Ceramic)
2
1
VOUT
(500mA)
L
VIN
CL : 10μF
(Ceramic)
VIN
5
CL
(ceramic)
CIN
(ceramic)
SD
●FOSC=300kHz
L
: 22μH (CDRH4D18,
*SD : Schottky diode
SUMIDA)
SD : CRS02 (TOSHIBA)
CIN : 4.7μF (Ceramic)
CL : 10μF (Ceramic)
* XC9206/9207/9208 series wire connection
■OPERATIONAL EXPLANATION
Each unit of the XC9206/9207/9208 series consists of a reference voltage source, ramp wave circuit, error amplifier, PWM
comparator, phase compensation circuit, output voltage adjustment resistors, driver transistor, current limiter circuit, U.V.L.O.
circuit and others. The series ICs compare, using the error amplifier, the voltage of the internal voltage reference source with
the feedback voltage from the VOUT pin through resistors R1 and R2. Phase compensation is performed on the resulting error
amplifier output, to input a signal to the PWM comparator to determine the turn-on time during PWM operation. The PWM
comparator compares, in terms of voltage level, the signal from the error amplifier with the ramp wave from the ramp wave
circuit, and delivers the resulting output to the buffer driver circuit to cause the Lx pin to output a switching duty cycle. This
process is continuously performed to ensure stable output voltage. The current feedback circuit monitors the P-channel MOS
driver transistor current for each switching operation, and modulates the error amplifier output signal to provide multiple
feedback signals. This enables a stable feedback loop even when a low ESR capacitor, such as a ceramic capacitor, is used,
ensuring stable output voltage.
< Reference Voltage Source >
The reference voltage source provides the reference voltage to ensure stable output voltage of the ICs.
< Ramp Wave Circuit >
The ramp wave circuit determines switching frequency. The frequency is fixed internally and can be selected from 300kHz,
600 kHz and 1.2 MHz. Clock pulses generated in this circuit are used to produce ramp waveforms needed for PWM
operation, and to synchronize all the internal circuits.
< Error Amplifier >
The error amplifier is designed to monitor output voltage. The amplifier compares the reference voltage with the feedback
voltage divided by the internal resistors (R1 and R2). When a voltage lower than the reference voltage is fed back, the output
voltage of the error amplifier increases. The gain and frequency characteristics of the error amplifier output are fixed internally
to deliver an optimized signal to the mixer.
<Current Limit>
The current limiter circuit of the XC9206/9207/9208 series monitors the current flowing through the P-channel MOS driver
transistor connected to the Lx pin, and features a combination of the constant-current type current limit mode and the operation
suspension mode.
①When the driver current is greater than a specific level, the constant-current type current limit function operates to turn off the
pulses from the Lx pin at any given timing.
②When the driver transistor is turned off, the limiter circuit is then released from the current limit detection state.
③At the next pulse, the driver transistor is turned on. However, the transistor is immediately turned off in the case of an over
current state.
④When the over current state is eliminated, the IC resumes its normal operation.
The IC waits for the over current state to end by repeating the steps ① through ③ . If an over current state continues for
several msec and the above three steps are repeatedly performed, the IC performs the function of latching the OFF state of the
driver transistor, and goes into operation suspension mode.
Once the IC is in suspension mode, operations can be resumed
by either turning the IC off via the CE /MODE pin, or by restoring power to the VIN pin. The suspension mode does not mean a
complete shutdown, but a state in which pulse output is suspended; therefore, the internal circuitry remains in operation. The
constant-current type current limit of the XC9206A/9207A/9208A series can be set at 600 mA.
Limit< #mS
Limit> #mS
CurrentLimit LEVEL
IOUT
0mA
VSS
VOUT
LX
CE/MODE
Restart
VIN
7/15
XC9206/XC9207/XC9208 Series
■OPERATIONAL EXPLANATION (Continued)
< U.V.L.O. Circuit>
When the VIN pin voltage becomes 1.4 V or lower, the P-channel output driver transistor is forced OFF to prevent false pulse
output caused by unstable operation of the internal circuitry. When the VIN pin voltage becomes 1.8 V or higher, switching
operation takes place. By releasing the U.V.L.O. function, the IC performs the soft start function to initiate output startup
operation. The soft start function operates even when the VIN pin voltage falls momentarily below the U.V.L.O. operating
voltage. The U.V.L.O. circuit does not cause a complete shutdown of the IC, but causes pulse output to be suspended;
therefore, the internal circuitry remains in operation.
< Function of CE/MODE pin >
The XC9206/9207/9208 series will enter into shut down state by inputting a low level signal to the CE/MODE pin. During a
shut down state, the current consumption of the IC becomes 0μA (TYP.), with a state of high impedance at the Lx pin and
VOUT pin. The IC starts its operation by inputting a high level signal to the CE/MODE pin. The input of the CE/MODE pin is
a CMOS input and the sink current is 0μA (TYP.).
●XC9206A / 07A series - Examples of how to use CE/MODE pin
SW_CE
ON
STATUS
Chip Disable
A
B
PWM control (XC9206),
PWM/PFM automatic switching control (XC9207
PWM control (XC9206),
OFF
ON
)
PWM/PFM automatic switching control (XC9207)
OFF
Chip Disable
(A)
(B)
●XC9208A series - Examples of how to use CE/MODE pin
SW_CE SW_PMW/PFM
STATUS
ON
*
Synchronous PWM control
Non-synchronous PWM/PFM
automatic switching control
OFF
ON
A
OFF
ON
OFF
*
Chip Disable
Chip Disable
Non-synchronous PWM/PFM
automatic switching control
(A)
(B)
OFF
OFF
ON
OFF
B
Synchronous PWM control
Intermediate voltage can be generated by RM1 and RM2. Please set the value of each R1, R2, RM1, RM2 at around 100kΩ.
For switches, CPU open-drain I/O port and transistor can be used.
< PWM / PFM >
XC9207/9208 series features PWM/PFM automatic switching control.
With the automatic PWM/PFM switching control function, the series ICs are automatically switched from PWM control to
PFM control mode under light load conditions. If during light load conditions the coil current becomes discontinuous and
on-time rate falls lower than PFM duty, the PFM circuit operates to output a pulse with a fixed on-time rate from the Lx pin.
During PFM operation with this fixed on-time rate, pulses are generated at different frequencies according to conditions of
the moment. This causes a reduction in the number of switching operations per unit of time, resulting in efficiency
improvement under light load conditions. However, since pulse output frequency is not constant, consideration should be
given if a noise filter or the like is needed. Necessary conditions for switching to PFM operation depend on input voltage,
load current, coil value and other factors.
8/15
XC9206/XC9207/XC9208
Series
■NOTES ON USE
●Application Information
1. The XC9206/9207/9208 series are designed for use with an output ceramic capacitor. If, however, the potential
difference between input and output is too large, a ceramic capacitor may fail to absorb the resulting high switching
energy and oscillation could occur on the output. If the input-output potential difference is large, connect an
electrolytic capacitor in parallel to compensate for insufficient capacitance.
2. Spike noise and ripple voltage arise in a switching regulator as with a DC/DC converter. These are greatly influenced
by external component selection, such as the coil inductance, capacitance values, and board layout of external
components. Once the design has been completed, verification with actual components should be done.
3. When the difference between VIN and VOUT is large and the load current is light, very narrow pulses will be outputted,
and there is the possibility that some cycles may be skipped completely.
●Oscillation Wave Form (FOSC=1.2MHz)
① VIN = 5.5V, VOUT=1.8V, IOUT=10mA
CH1 : Lx
L
: 4.7μH (CDRH3D16,
SUMIDA)
SD : CRS02 (TOSHIBA)
CH2 : VOUT
CIN : 4.7μF (Ceramic)
AC-COUPLED
CL
: 10μF
(Ceramic)
4. When the difference between VIN and VOUT is small, and the load current is heavy, very wide pulses will be outputted
and there is the possibility that some cycles may be skipped completely: in this case, the Lx pin may not go low at all.
●Oscillation Wave Form (FOSC=1.2MHz)
② VIN = 2.0V, VOUT=1.8V, IOUT=60mA
CH1 : Lx
L
: 4.7μH (CDRH3D16,
SUMIDA)
SD : CRS02 (TOSHIBA)
CH2 : VOUT
CIN : 4.7μF (Ceramic)
AC-COUPLED
CL
: 10μF
(Ceramic)
5. With the IC, the peak current of the coil is controlled by the current limit circuit. Since the peak current increases when
dropout voltage or load current is high, current limit starts operating, and this can lead to instability. When peak current
becomes high, please adjust the coil inductance value and fully check the circuit operation. In addition, please
calculate the peak current according to the following formula:
Ipk = (VIN - VOUT) x On Duty / (2 x L x FOSC) + IOUT
OnDuty: OnDuty ratio of Pch Driver Transistor
L
: Coil Inductance Value
FOSC : Oscillation Frequency
6. When the peak current which exceeds limit current flows within the specified time, the built-in P-ch driver transistor is
turned off. During the time until it detects limit current and before the built-in transistor can be turned off, the current
for limit current flows; therefore, care must be taken when selecting the rating for the coil or the schottky diode.
7. When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
9/15
XC9206/XC9207/XC9208 Series
■NOTES ON USE (Continued)
●Application Information (Continued)
8. Care must be taken when laying out the PC Board, in order to prevent misoperation of the current limit mode.
Depending on the state of the PC Board, latch time may become longer and latch operation may not work. In order to
avoid the effect of noise, the board should be laid out so that capacitors are placed as close to the chip as possible.
9. Use of the IC at voltages below the recommended voltage range may lead to instability.
10. This IC should be used within the stated absolute maximum ratings in order to prevent damage to the device.
11. Depending on the input-output voltage differential, or load current, some pulses may be skipped, and the ripple voltage
may increase. When the series' duty cycle is digitally signalized, the linear duty cycle and the digitally signalized duty
cycle cannot carry out completely the same change, which means that the duty cycle does not change linearly. The
output is stabilized by applying the phase compensation and adjusting the duty cycle, even when the duty cycle loses the
linear change in the whole circuit. When the state where the output was stabilized is continued by applying phase
compensation to duty cycle which lost linearity, ripple voltage does not increase more than it. The ripple voltage may
increase to about several 10mV according to operating conditions. It is possible, by increasing the capacitance values,
to reduce the ripple voltage. The operating conditions are greatly influenced by the dropout voltage, the load current, the
delay-time, or the external components, such as the coil inductance, and the capacitance values. Verification with actual
parts should be done.
●The Increase of Ripple Voltage (1.2MHz)
① VIN=4.2V, VOUT=1.8V, IOUT=180mA
② VIN=4.2V, VOUT=1.8V, IOUT=60mA
CH1: Lx
CH1: Lx
CH2: VOUT
CH2: VOUT
AC-COUPLED
AC-COUPLED
③ VIN=3.6V, VOUT=1.8V, IOUT=30mA
L
: 4.7μH (CDRH3D16,
CH1: Lx
SUMIDA)
SD : CRS02 (TOSHIBA)
CH2: VOUT
CIN : 4.7μF (Ceramic)
CL
: 10μF
(Ceramic)
AC-COUPLED
●Instructions on Pattern Layout
CE/
MODE
VIN
CIN
GND
1. In order to stabilize VDD's voltage level, we recommend that a
by-pass capacitor (CIN) be connected as close as possible to the
VIN & VSS pins.
5
4
2. Please mount each external component as close to the IC as
possible, and connect it to GND with the shortest possible PCB
traces.
CL
SD
1
2
3
Lx
3. Wire external components as close to the IC as possible and use
thick, short connecting traces to reduce the circuit impedance.
4. Make sure that the PCB GND traces are as thick as possible, as
variations in ground potential caused by high ground currents at
the time of switching may result in instability.
VIN Line
L
GND Line
Other Line
VOUT
( Through Hole to SD
)
10/15
XC9206/XC9207/XC9208
Series
■TEST CIRCUITS
Circuit ①
Circuit ②
CE
/MODE
VOUT
4
3
2
VOUT
CE
4
5
3
2
1
/MODE
VSS
Lx
L
VSS
Lx
VIN
5
1
VI
SD
V
CL
CIN
RL
200
Ω
1
F
μ
Circuit ③
Circuit ④
VOUT
CE
/MODE
VOUT
CE
4
3
2
4
3
2
1
/MODE
VSS
Lx
VSS
Lx
A
VIN
VIN
5
F
1
5
V
L
1
μ
1
F
μ
Circuit ⑤
Circuit ⑥
H
CE
/MODE
CE
/MODE
VOUT
VOUT
4
3
2
1
4
3
2
1
A
L
VSS
Lx
VSS
Lx
L
VI
5
5
VIN
SD
V
1kΩ
CL
CIN
1μF
1Ω
1.2MHz
600kHz
300kHz
CIN
CL
L
4.7μF (ceramic)
10μF (ceramic)
4.7μH
4.7μF (ceramic)
10μF (ceramic)
10μH
4.7μF (ceramic)
10μF (ceramic)
22μH
SD
Schottky Diode
Schottky Diode
Schottky Diode
11/15
XC9206/XC9207/XC9208 Series
■TYPICAL PERFORMANCE CHARACTERISTICS
(1) Output Voltage vs. Output Current
XC9208A18C
VOUT=1.8V (Oscillation Frequency1.2MHz)
XC9208A186
VOUT=1.8V (Oscillation Frequency 600kHz)
CIN:4.7 F,CL:10 F, L:4.7 H(CDRH3D16),
CIN:4.7 F,CL:10 F, L:10 H(CDRH4D18C),
μ μ μ
μ
μ
μ
SD:CRS02, Topr=25
SD:CRS02, Topr=25
℃
℃
2
1.9
1.8
1.7
1.6
1.5
2
1.9
1.8
1.7
1.6
1.5
PWM/PFM
PWM/PFM
3.6V, 4.2V
VIN=2.4V
VIN=2.4V
Switching Control
Switching Control
PWM
PWM Control
3.6V
4.2V
Control
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current IOUT (mA)
Output Current IOUT (mA)
(2) Efficiency vs. Output Current
XC9208A183
VOUT=1.8V (Oscillation Frequency 300kHz)
CIN:4.7 F,CL:10 F, L:22 H(CDRH4D28C),
μ
μ
μ
SD:CRS02, Topr=25
℃
2
1.9
1.8
1.7
1.6
1.5
PWM/PFM
3.6V, 4.2V
VIN=2.4V
Switching Control
PWM Control
0.1
1
10
100
1000
Output Current IOUT (mA)
12/15
XC9206/XC9207/XC9208
Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(3) Ripple Voltage vs. Output Current
XC9208A18C
XC9208A186
VOUT=1.8V (Oscillation Frequency 1.2MHz)
VOUT=1.8V (Oscillation Frequency 600kHz)
CIN:4.7 F,CL:10 F, L:4.7 H(CDRH3D16),
μ
μ
μ
CIN:4.7 F,CL:10 F, L:10 H(CDRH4D18C),
μ
μ
μ
SD:CRS02, Topr=25
℃
SD:CRS02, Topr=25
℃
100
80
60
40
20
0
100
80
60
40
20
0
PWM Control
PWM Control
4.2V
3.6V
PWM/PFM Switching
Control
PWM/PFM Switching Control
4.2V
3.6V
VIN=2.4V
VIN=2.4V
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current IOUT (mA)
Output Current IOUT (mA)
XC9208A183
VOUT=1.8V (Oscillation Frequency 300kHz)
CIN:4.7 F,CL:10 F, L:22 H(CDRH3D28C),
μ
μ
μ
SD:CRS02, Topr=25
℃
100
80
60
40
20
0
PWM Control
PWM/PFM Switching
Control
3.6V
4.2V
VIN=2.4V
0.1
1
10
100
1000
Output Current IOUT (mA)
■PACKAGING INFORMATION
●SOT-25
13/15
XC9206/XC9207/XC9208 Series
■MARKING RULE
●SOT-25
① Represents product name and type of DC/DC converters
5
4
MARK
PRODUCT SERIES
XC9206AxxxMx
XC9207AxxxMx
XC9208AxxxMx
①
②
③
④
6
7
8
1
2
3
* Character inversion is used.
SOT-25
(TOP VIEW)
② Represents integer of output voltage and oscillation frequency
MARK
OUTPUT VOLTAGE
(V)
FOSC=300kHz
FOSC=600kHz
FOSC=1.2MHz
XC920xx②x3Mx
XC920xx②x6Mx
XC920xx②xCMx
0
1
2
3
4
0
1
2
3
4
A
B
C
D
E
0.x
1.x
2.x
3.x
4.x
③ Represents decimal number of output voltage and oscillation frequency
MARK
OUTPUT VOLTAGE
(V)
FOSC=300kHz
FOSC=600kHz
FOSC=1.2MHz
XC920xxx③3Mx
XC920xxx③6Mx
XC920xxx③CMx
0
1
2
3
4
5
6
7
8
Z
9
A
B
C
D
E
F
A
B
C
D
E
F
x. 0
x. 1
x. 2
x. 3
x. 4
x. 5
x. 6
x. 7
x. 8
x. 85
x. 9
H
K
L
H
K
L
Y
M
Y
M
* Output voltage 0.9V ~ 4.0V (100mV increments), 1.85V and 2.85V are standard products.
Output voltages other than these are available as semi-custom products.
②③ example :
MARK
OSCILLATION
VOUT=3.3V
VOUT=5.0V
VOUT=1.85V
FREQUENCY
②
③
3
②
③
0
②
③
Z
300kHz
600kHz
1.2MHz
3
3
5
5
F
1
1
B
D
D
A
A
Y
D
Y
④ Represents production lot number
0 to 9, A to Z repeated (G, I, J, O, Q, W excepted)
14/15
XC9206/XC9207/XC9208
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.
15/15
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