XCL201 Datasheet, PDF (1/21 Pages) Torex Semiconductor – Inductor Built-in Step-Down “micro DC/DC” Converters

XCL201/XCL202 Series
Inductor Built-in Step-Down “micro DC/DC” Converters
ETR2802-003
ˑGreenOperation 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 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
˔SSD(Solid State Drive)
˔PND(Portable Navigation Device)
■FEATURES
Ultra Small
: 2.5mmÊ·2.0mm, h=1.0mm
Input Voltage
: 2.0V ~ 6.0V
Output Voltage
: 0.8V ~ 4.0V (±2.0%)
High Efficiency
: 92%(V_IN=4.2V,V_OUT=3.3V)
Output Current
: 400mA
Oscillation Frequency
: 1.2MHz (±15%)
Maximum Duty Cycle
: 100%
Output Capacitor
: Low ESR Ceramic
Current Limiter Circuit
: Constant Current & Latching
Control Methods
: PWM (XCL201)
PWM/PFM Auto (XCL202)
CE Function
: Soft-Start Circuit Built-In
Operating Ambient Temperature : -40ˆʙ+85ˆ
Environmentally Friendly : EU RoHS Compliant, Pb Free
˙TYPICAL APPLICATION CIRCUIT ^{˙çTYPICAL PERFORMANCE}
CHARACTERISTICS
XCL201/XCL202 Series
XCL201B331BR/XCL202B331BR
100
XCL202(PWM/PFM)
L1
80
C_L
10ЖF
400mA
L_X
V_IN
Vss
Vss
V_OUT
CE
L2
C_IN
4.7ЖF
(TOP VIEW)
* “L1 and L_X”, and “L2 and V_OUT” is connected by wiring.
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60
VIN= 5.5V
40
5.0V
XCL201(PWM)
20
4.2V
0
0.01
0.1
1
VOUT=3.3V
10
100 1000
Output Current:IOUT (mA)
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