XCL201/XCL202Series
ETR2802-003
Inductor Built-in Step-Down “micro DC/DC” Converters
☆GreenOperation Compatible
■GENERAL DESCRIPTION
The XCL201/XCL201 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 400mA 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 1.2MHz, and includes 0.42ΩP-channel driver transistor and 0.52ΩN-channel switching
transistor. As for operation mode, the XCL201 series is PWM control, the XCL202 series is automatic PWM/PFM switching
control, 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. The
series provide short-time turn-on by the soft start function internally set in 0.25ms (TYP). The series 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%)
: 92%(VIN=4.2V,VOUT=3.3V)
: 400mA
High Efficiency
●WiMAX PDAs, MIDs, UMPCs
●Portable game consoles
Output Current
Oscillation Frequency
Maximum Duty Cycle
Output Capacitor
Current Limiter Circuit
Control Methods
: 1.2MHz (±15%)
●Digital cameras, Camcorders
●SSD(Solid State Drive)
: 100%
: Low ESR Ceramic
: Constant Current & Latching
: PWM (XCL201)
●PND(Portable Navigation Device)
PWM/PFM Auto (XCL202)
: Soft-Start Circuit Built-In
CE Function
Operating Ambient Temperature : -40℃~+85℃
Environmentally Friendly
: EU RoHS Compliant, Pb Free
■TYPICAL PERFORMANCE
CHARACTERISTICS
XCL201B331BR/XCL202B331BR
■TYPICAL APPLICATION CIRCUIT
XCL201/XCL202 Series
100
XCL202(PWM/PFM)
L1
80
VIN
LX
60
CIN
4.7μF
VIN= 5.5V
Vss
CE
Vss
CL
10μF
40
XCL201(PWM)
5.0V
0.1
VOUT
400mA
20
4.2V
L2
VOUT=3.3V
0
0.01
1
10
100
1000
(TOP VIEW)
* “L1 and LX”, and “L2 and VOUT” is connected by wiring.
Output Current:IOUT (mA)
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