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PDF XCL207 Data sheet ( Hoja de datos )
| Número de pieza | XCL207 | |
| Descripción | Inductor Built-in Step-Down micro DC/DC Converters | |
| Fabricantes | Torex Semiconductor | |
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Hay una vista previa y un enlace de descarga de XCL207 (archivo pdf) en la parte inferior de esta página. Total 26 Páginas | ||
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XCL205/XCL206/XCL207Series
www.DataSheet4U.com
ETR2801-005b
Inductor Built-in Step-Down “micro DC/DC” Converters
☆GreenOperation Compatible
■GENERAL DESCRIPTION
The XCL205/XCL206/XCL207 series is a synchronous step-down micro DC/DC converter which integrates an inductor and a
control IC in one tiny package (2.5mm×2.0mm, H=1.0mm). A stable power supply with an output current of 600mA is
configured using only two capacitors connected externally.
Operating voltage range is from 2.0V to 6.0V. Output voltage is internally set in a range from 0.8V to 4.0V in increments of
0.05V. The device is operated by 3.0MHz, and includes 0.42ΩP-channel driver transistor and 0.52ΩN-channel switching
transistor. As for operation mode, the XCL205 series is PWM control, the XCL206 series is automatic PWM/PFM switching
control and the XCL207 series can be manually switched between the PWM control mode and the automatic PWM/PFM
switching control mode, allowing fast response, low ripple and high efficiency over the full range of loads (from light load to
heavy load). During stand-by, the device is shutdown to reduce current consumption to as low as 1.0μA or less. With the
built-in UVLO (Under Voltage Lock Out) function, the internal driver transistor is forced OFF when input voltage becomes 1.4V
or lower. XCL205B/XCL206B/XCL207B series provide short-time turn-on by the soft start function internally set in 0.25 ms
(TYP). XCL205B(C) /XCL206 B(C) / XCL207B(C) integrate CL auto discharge function which enables the electric charge
stored at the output capacitor CL to be discharged via the internal auto-discharge switch located between the LX and VSS pins.
When the devices enter stand-by mode, output voltage quickly returns to the VSS level as a result of this function.
■APPLICATIONS
●Mobile phones, Smart phones
●Bluetooth Headsets
●WiMAX PDAs, MIDs, UMPCs
●Portable game consoles
●Digital cameras, Camcorders
●Electronic dictionaries
■FEATURES
Ultra Small
: 2.5mm×2.0mm, H=1.0mm
Input Voltage
: 2.0V ~ 6.0V
Output Voltage
: 0.8V ~ 4.0V (+2.0%)
High Efficiency (VOUT=1.8V)
Output Current
: 85% (TYP.)
: 600mA
Oscillation Frequency
: 3.0MHz (+15%)
Maximum Duty Cycle
: 100%
Control Methods
: PWM (XCL205)
PWM/PFM Auto (XCL206)
PWM/PFM Manual (XCL207)
High Speed Soft-Start Circuit Built-In
Current Limiter Circuit Built-In (Constant Current & Latching)
Low ESR Ceramic Capacitor Compatible
CL High Speed Auto Discharge
* Performance depends on external components and wiring on the PCB.
■TYPICAL APPLICATION CIRCUIT ■TYPICAL PERFORMANCE
CHARACTERISTICS
XCL205/206/207 Series
CL
10μF
600mA
L1
LX VIN
Vss Vss
VOUT CE/MODE
L2
CIN
4.7μF
(TOP VIEW)
* “L1 and LX”, and “L2 and VOUT” is connected by wiring.
XCL205A333xx/XCL206A333xx/XCL207A333xx
100
XCL206/XCL207(PWM/PFM)
80
60
VIN= 5.5V
5.0V
40 4.2V
20
XCL205/XCL207
(PWM)
VOUT=3.3V
0
0.1
1
10 100 1000
Output Current:IOUT (mA)
1/26
1 page  
■ELECTRICAL CHARACTERISTICS (Continued)
●XCL205A183AR/XCL206A183AR/XCL207A183AR, VOUT=1.8V, fOSC=3.0MHz, Ta=25℃
XCL205/XCL206/XCL207
Series
www.DataSheet4U.com
PARAMETER
SYMBOL
Output Voltage
Operating Voltage Range
Maximum Output Current
VOUT
VIN
IOUTMAX
UVLO Voltage
Supply Current (XCL205)
Supply Current (XCL206, XCL207)
Stand-by Current
Oscillation Frequency
VUVLO
IDD
ISTB
fOSC
PFM Switching Current (*12)
IPFM
PFM Duty Limit (*12)
Maximum Duty Cycle
Minimum Duty Cycle
DTYLIMIT_PFM
DMAX
DMIN
Efficiency
EFFI
Lx SW "H" ON Resistance 1
Lx SW "H" ON Resistance 2
Lx SW "L" ON Resistance 1
Lx SW "L" ON Resistance 2
Lx SW "H" Leak Current (*5)
Lx SW "L" Leak Current (*5)
Current Limit (*10)
Output Voltage
Temperature Characteristics
RLｘH
RLｘH
RLｘL
RLｘL
ILeakH
ILeakL
ILIM
△VOUT/
(VOUT・△topr)
CE "H" Voltage
VCEH
CE "L" Voltage
VCEL
CONDITIONS
When connected to external components,
VIN=VCE=5.0V, IOUT=30mA
VIN=VOUT(E)+2.0V, VCE=1.0V
When connected to external components (*9)
VCE=VIN,VOUT=0V,
Voltage which Lx pin holding “L” level (*1, *11)
VIN=VCE=5.0V, VOUT=VOUT(T)×1.1V
VIN=5.0V, VCE=0V, VOUT=VOUT(T)×1.1V
When connected to external components,
VIN=VOUT(T)+2.0V,VCE=1.0V, IOUT=100mA
When connected to external components,
VIN=VOUT(T)+2.0V, VCE=VIN , IOUT=1mA (*12)
VCE= VIN=(C-1) IOUT=1mA (*12)
VIN=VCE=5.0V, VOUT=VOUT (T)×0.9V
VIN=VCE=5.0V, VOUT=VOUT (T)×1.1V
When connected to external components,
VCE=VIN＝VOUT (T)+1.2V, IOUT = 100mA
VIN=VCE=5.0V, VOUT=0V, ILX=100mA (*3)
VIN=VCE=3.6V, VOUT=0V, ILX=100mA (*3)
VIN=VCE=5.0V (*4)
VIN=VCE=3.6V, (*4)
VIN=VOUT=5.0V, VCE=0V, LX=0V
VIN=VOUT=5.0V, VCE=0V, LX= 5.0V
VIN=VCE=5.0V, VOUT=VOUT (E)×0.9V (*8)
IOUT =30mA
-40℃≦Topr≦85℃
VOUT=0V, Applied voltage to VCE,
Voltage changes Lx to “H” level (*11)
VOUT=0V, Applied voltage to VCE,
Voltage changes Lx to “L” level (*11)
MIN. TYP. MAX. UNITS CIRCUIT
1.764
2.0
600
1.800 1.836
- 6.0
--
V
V
mA
①
①
①
1.00
-
-
-
2550
1.40
46
21
0
3000
1.78
65
35
1.0
3450
V
μA
μA
kHz
③
②
②
①
170 220 270 mA
⑩
- 200 300
100 -
-
- -0
%
%
%
①
③
③
- 85 - % ①
-
0.35 0.55
Ω
-
0.42 0.67
Ω
-
0.45 0.66
Ω
-
0.52 0.77
Ω
- 0.01 1.0 μA
- 0.01 1.0 μA
900 1050 1350 mA
④
④
-
-
⑤
⑤
⑥
- ±100 - ppm/ ℃ ①
0.65 -
VIN V
③
VSS - 0.25 V ③
PWM "H" Level Voltage (*13)
VPWMH
When connected to external components,
IOUT=1mA (*6), Voltage which oscillation
frequency becomes 2550kHz≦fOSC≦3450kHz (*13)
-
- VIN - 1.0 V
①
PWM "L" Level Voltage (*13)
CE "H" Current
CE "L" Current
Soft Start Time
Latch Time
Short Protection
Threshold Voltage
Inductance Value
Allowed Inductor Current
VPWML
ICEH
ICEL
tSS
tLAT
VSHORT
L
IDC
When connected to external components,
IOUT=1mA (*6), Voltage which oscillation
frequency becomes fOSC＜2550kHz (*13)
VIN=VCE=5.0V, VOUT=0V
VIN=5.0V, VCE=0V, VOUT=0V
When connected to external components,
VCE=0V→VIN , IOUT=1mA
VIN=VCE=5.0V, VOUT=0.8×VOUT(T)
Short Lx at 1Ω resistance (*7)
Sweeping VOUT, VIN=VCE=5.0V, Short Lx at
1Ω resistance, VOUT voltage which Lx becomes “L”
level within 1ms
Test frequency =1MHz
ΔT=40℃
VIN -
0.25
- 0.1
- 0.1
0.5
1.0
0.675
-
-
-
-
-
0.9
-
0.900
1.5
1000
-
0.1
0.1
2.5
20
1.125
-
-
V
μA
μA
ms
ms
V
μH
mA
①
⑤
⑤
①
⑦
⑦
Test conditions: Unless otherwise stated, VIN=5.0V, VOUT (T)=Nominal Voltage
NOTE:
*1: Including hysteresis operating voltage range.
*2: EFFI = { ( output voltage×output current ) / ( input voltage×input current) }×100
*3: ON resistance (Ω)= (VIN - Lx pin measurement voltage) / 100mA
*4: Design value
*5: When temperature is high, a current of approximately 10μA (maximum) may leak.
*6:The CE/MODE pin of the XCL207 series works also as an external switching pin of PWM control and PWM/PFM control. When the IC is in the
operation, control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than VIN minus
0.3V, and to the PWM mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0V and equal to or greater than VCEH.
*7:Time until it short-circuits VOUT with GND via 1Ωof resistor from an operational state and is set to Lx=0V from current limit pulse generating.
*8: When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
*9: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.
If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.
*10: Current limit denotes the level of detection at peak of coil current.
*11: “H”=VIN~VIN-1.2V, “L”=+0.1V~-0.1V
*12: IPFM and DTYLIMIT_PFM are defined only for the XCL206 and XCL207 series which have PFM control function. (Not for the XCL 205 series)
*13: VPWMH and VPWML are defined only for the XCL207 series. (They are not used in the XCL205/and XCL206 series)
5/26
5 Page 
XCL205/XCL206/XCL207
Series
www.DataSheet4U.com
■OPERATIONAL DESCRIPTION
The XCL205/XCL/206/XCL207 series consists of a reference voltage source, ramp wave circuit, error amplifier, PWM
comparator, phase compensation circuit, output voltage adjustment resistors, P-channel MOSFET driver transistor, N-channel
MOSFET switching transistor for the synchronous switch, current limiter circuit, UVLO circuit with control IC, and an inductor.
(See the block diagram above.) Using the error amplifier, the voltage of the internal voltage reference source is compared with
the feedback voltage from the VOUT pin through split 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 DC/DC converter.
<Ramp Wave Circuit>
The ramp wave circuit determines switching frequency. The frequency is fixed internally 3.0MHz. 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 split resistors, R1 and R2. When a feed back voltage is lower than the reference voltage, the
output voltage of the error amplifier is increased. 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 XCL205/XCL206/XCL207 series monitors the current flowing through the P-channel MOS driver
transistor connected to the Lx pin, and features a combination of the current limit mode and the operation suspension mode.
① When the driver current is greater than a specific level, the current limit function operates to turn off the pulses from the Lx pin
at any given timing.
② When the driver transistor is turned off, the limiter circuit is then released from the current limit detection state.
③ At the next pulse, the driver transistor is turned on. However, the transistor is immediately turned off in the case of an over
current state.
④ When 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 a few
milliseconds 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 state. Once the IC is in suspension state, 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 state does not mean a
complete shutdown, but a state in which pulse output is suspended; therefore, the internal circuitry remains in operation. The
current limit of the XCL205/XCL206/XCL207 series can be set at 1050mA at typical. 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, an input capacitor is
placed as close to the IC as possible.
Limit < # ms
Limit > # ms
Current Limit LEVEL
I Lx 0mA
V OUT
Lx
Vss
VCE Restart
V IN
11/26
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet XCL207.PDF ] | |
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