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XCL205/XCL206/XCL207
Series
Inductor Built-in Step-Down “micro DC/DC” Converters
0
20
40
60
80
100
0.1 1 10 100 1000
Output Current:I
OUT
(mA)
Efficency:EFFI(%
VIN= 5.5V
5.0V
4.2V
VOUT=3.3V
PWM
XCL206/XCL207
PWM/PFM
XCL205/XCL207
■TYPICAL PERFORMANCE
CHARACTERISTICS
☆GreenOperation Compatible
■APPLICATIONS
●Mobile phones, Smart phones
●Bluetooth Headsets
●WiMAX PDAs, MIDs, UMPCs
●Portable game consoles
●Digital cameras, Camcorders
●Electronic dictionaries
■TYPICAL APPLICATION CIRCUIT
ETR2801-008
■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 C
L
auto discharge function which enables the electric charge
stored at the output capacitor C
L
to be discharged via the internal auto-discharge switch located between the L
X
and V
SS
pins.
When the devices enter stand-by mode, output voltage quickly returns to the V
SS
level as a result of this function.
V
IN
Vss
CE/MODE
L
X
ss
V
OUT
CL
10μF
4.7μF
CIN
L1
L2
600mA
(TOP VIEW)
* “L1 and L
X
”, and “L2 and V
OUT
” is connected by wiring.
■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 : 90% (V
IN
=4.2V, V
OUT
=3.3V)
Output Current : 600mA
Oscillation Frequency : 3.0MHz (+15%)
Maximum Duty Cycle
Capacitor
CE Function
Protection Circuits
: 100%
: Low ESR Ceramic
: Active High
Soft-Start Circuit Built-In
C
L
High Speed Auto Discharge
:Current Limiter Circuit Built-In
(Constant Current & Latching)
Control Methods : PWM (XCL205)
PWM/PFM Auto (XCL206)
PWM/PFM Manual (XCL207)
* Performance depends on external components and wiring on the PCB.
XCL205A333xx/XCL206A333xx/XCL207A333xx
XCL205/206/207 Series
