XCL205/XCL206/XCL207Series
Inductor Built-in Step-Down “micro DC/DC” Converters
■GENERAL DESCRIPTION
ETR2801-005c
☆GreenOperation Compatible
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.
■FEATURES
Ultra Small
■APPLICATIONS
●Mobile phones, Smart phones
●Bluetooth Headsets
: 2.5mm×2.0mm, H=1.0mm
: 2.0V ~ 6.0V
Input Voltage
Output Voltage
: 0.8V ~ 4.0V (+2.0%)
: 85% (TYP.)
High Efficiency (VOUT=1.8V)
Output Current
●WiMAX PDAs, MIDs, UMPCs
●Portable game consoles
●Digital cameras, Camcorders
●Electronic dictionaries
: 600mA
Oscillation Frequency
Maximum Duty Cycle
Control Methods
: 3.0MHz (+15%)
: 100%
: 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
XCL205A333xx/XCL206A333xx/XCL207A333xx
XCL205/206/207 Series
100
XCL206/XCL207(PWM/PFM)
L1
80
LX
VIN
60
CIN
VIN= 5.5V
5.0V
CL
10μF
4.7μF
Vss
Vss
40
20
0
600mA
4.2V
XCL205/XCL207
(PWM)
VOUT
CE/MODE
L2
VOUT=3.3V
(TOP VIEW)
* “L1 and LX”, and “L2 and VOUT” is connected by wiring.
0.1
1
10
100
1000
Output Current:IOUT (mA)
1/26
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