XCL205_1 Datasheet, PDF (1/26 Pages) Torex Semiconductor – Inductor Built-in Step-Down micro DC/DC Converters

XCL205/XCL206/XCL207 Series
ETR2801-008
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. 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
: 2.5mm×2.0mm, H=1.0mm
Input Voltage
: 2.0V ~ 6.0V
Output Voltage
: 0.8V ~ 4.0V (+2.0%)
High Efficiency
Output Current
: 90% (V_IN=4.2V, V_OUT=3.3V)
: 600mA
Oscillation Frequency
: 3.0MHz (+15%)
Maximum Duty Cycle
: 100%
Capacitor
: Low ESR Ceramic
CE Function
: Active High
Soft-Start Circuit Built-In
Protection Circuits
C_L High Speed Auto Discharge
:Current Limiter Circuit Built-In
(Constant Current & Latching)
Control Methods
: PWM (XCL205)
PWM/PFM Auto (XCL206)
PWM/PFM Manual (XCL207)
* Performance depends on external components and wiring on the PCB.
■TYPICAL APPLICATION CIRCUIT ■TYPICAL PERFORMANCE
CHARACTERISTICS
XCL205/206/207 Series
L1
XCL205A333xx/XCL206A333xx/XCL207A333xx
100
XCL206/XCL207(PWM/PFM)
80
CL
10μF
600mA
L_X
V_IN
Vss
Vss
V_OUT CE/MODE
L2
CIN
4.7μF
(TOP VIEW)
* “L1 and L_X”, and “L2 and V_OUT” is connected by wiring.
60
VIN= 5.5V
5.0V
40 _4.2V
20
XCL205/XCL207
(PWM)
VOUT=3.3V
0
0.1
1
10
100
1000
Output Current:IOUT (mA)
1/26