XCL205/XCL206/XCL207 Series0 pages

XCL205/XCL206/XCL207 Series

ETR2801-013

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(XCL20xG:1.8V6.0V). 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 0.52Ω
N-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(G)/XCL206B(G)/XCL207B(G) series provide short-time turn-on by the soft start function
internally set in 0.25 ms (TYP). XCL205B(C,G) /XCL206 B(C,G) / XCL207B(C,G) 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

■APPLICATIONS

Ultra Small
Input Voltage

●Mobile phones, Smart phones
●Bluetooth Headsets

Output Voltage
High Efficiency
Output Current
Oscillation Frequency
Maximum Duty Cycle
Capacitor
CE Function

●WiMAX PDAs, MIDs, UMPCs
●Portable game consoles
●Digital cameras, Camcorders
●Electronic dictionaries

Protection Circuits
Control Methods

Operating Ambient Temperature
Environmentally Friendly

■TYPICAL APPLICATION CIRCUIT
XCL205/206/207 Series

: 2.5mm×2.0mm, H=1.0mm
: 2.0V ~ 6.0V(A/B/C Type)
1.8V ~ 6.0V(G Type)
: 0.8V ~ 4.0V (+2.0%)
: 90% (VIN=4.2V, VOUT=3.3V)
: 600mA
: 3.0MHz (+15%)
: 100%
: Low ESR Ceramic
: Active High
Soft-Start Circuit Built-In
CL High Speed Auto Discharge
:Current Limiter Circuit Built-In
(Constant Current & Latching)
: PWM (XCL205)
PWM/PFM Auto (XCL206)
PWM/PFM Manual (XCL207)
: -40℃+85℃
: EU RoHS Compliant, Pb Free

■TYPICAL PERFORMANCE
CHARACTERISTICS
XCL205A333xx/XCL206A333xx/XCL207A333xx
100

L1
LX

80

VIN

Vss

Vss

VOUT

CIN
4.7μF

CE/MODE

600mA

L2

Efficency:EFFI(%)

CL
10μF

XCL206/XCL207(PWM/PFM)

60

VIN= 5.5V
5.0V
4.2V

40

XCL205/XCL207
(PWM)

20
VOUT=3.3V

(TOP VIEW)
* “L1 and LX”, and “L2 and VOUT” is connected by wiring.

0
0.1

1

10

100

1000

Output Current:IOUT (mA)

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