XCL205/XCL206/XCL207
Series
Inductor Built-in Step-Down “micro DC/DC” Converters
ETR2801-008
☆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 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.
■APPLICATIONS
●Mobile
phones, Smart phones
●Bluetooth
Headsets
●WiMAX
PDAs, MIDs, UMPCs
●Portable
game consoles
●Digital
cameras, Camcorders
●Electronic
dictionaries
■FEATURES
Ultra Small
Input Voltage
Output Voltage
High Efficiency
Output Current
Oscillation Frequency
Maximum Duty Cycle
Capacitor
CE Function
: 2.5mm×2.0mm, H=1.0mm
: 2.0V ~ 6.0V
: 0.8V ~ 4.0V (+2.0%)
: 90% (V
IN
=4.2V, V
OUT
=3.3V)
: 600mA
: 3.0MHz (+15%)
: 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)
: PWM (XCL205)
PWM/PFM Auto (XCL206)
PWM/PFM Manual (XCL207)
Protection Circuits
Control Methods
* Performance depends on external components and wiring on the PCB.
■TYPICAL
APPLICATION CIRCUIT
■TYPICAL
PERFORMANCE
CHARACTERISTICS
XCL205/206/207 Series
XCL205A333xx/XCL206A333xx/XCL207A333xx
100
80
V
IN
Vss
CE/MODE
L2
CIN
4.7μF
XCL206/XCL207(PWM/PFM)
L1
L
X
CL
10μF
600mA
V
OUT
Vss
Efficency:EFFI(%)
60
40
20
VIN= 5.5V
5.0V
4.2V
XCL205/XCL207
(PWM)
VOUT=3.3V
0
(TOP VIEW)
* “L1 and L
X
”, and “L2 and V
OUT
” is connected by wiring.
0.1
1
10
100
1000
Output Current:I
OUT
(mA)
1/26
TOREX [ TOREX SEMICONDUCTOR ]
