XCL201/XCL202 Series0 pages

XCL201/XCL202 Series

ETR2802-005

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 1.0μ or less. With the built-in UVLO
A
(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 autodischarge 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
Output Voltage
High Efficiency
Output Current
Oscillation Frequency
Maximum Duty Cycle
Output Capacitor
Current Limiter Circuit
Control Methods

: 2.5mm×2.0mm, h=1.0mm
: 2.0V ~ 6.0V
: 0.8V ~ 4.0V (±2.0%)
: 92%(VIN=4.2V,VOUT=3.3V)
: 400mA
: 1.2MHz (±15%)
: 100%
: Low ESR Ceramic
: Constant Current & Latching
: PWM (XCL201)
PWM/PFM Auto (XCL202)
CE Function
: Soft-Start Circuit Built-In
Operating Ambient Temperature : -40℃+85℃
Environmentally Friendly
: EU RoHS Compliant, Pb Free

●Mobile phones, Smart phones
●Bluetooth Headsets
●WiMAX PDAs, MIDs, UMPCs
●Portable game consoles
●Digital cameras, Camcorders
●SSD(Solid State Drive)
●PND(Portable Navigation Device)

■TYPICAL APPLICATION CIRCUIT

■ TYPICAL PERFORMANCE
CHARACTERISTICS
XCL201B331BR/XCL202B331BR

XCL201/XCL202 Series
100
L1
VIN

CL
10μF

Vss

CIN
4.7μF

CE

VOUT
400mA

Efficency:EFFI(%)

80

LX
Vss

XCL202(PWM/PFM)

60
40
20

(TOP VIEW)

XCL201(PWM)

5.0V

L2

* “L1 and LX”, and “L2 and VOUT” is connected by wiring.

VIN= 5.5V

4.2V
VOUT=3.3V

0
0.01

0.1

1

10

100

1000

Output Current:IOUT (mA)

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