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Torex Semiconductor

XCL208 Datasheet Preview

XCL208 Datasheet

400mA Inductor Built-in Step-Down micro DC/DC Converters

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XCL208/XCL209 Series
400mA Inductor Built-in Step-Down “micro DC/DC” Converters
ETR28003-004
GENERAL DESCRIPTION
GreenOperation Compatible
The XCL208/XCL209 series is a synchronous step-down micro DC/DC converter which integrates an inductor and a control IC in
one tiny package (2.5mm×2.15mm, h=1.05mm). A stable power supply with an output current of 400mA is configured using only
two capacitors connected externally.
An internal coil simplifies the circuit and enables minimization of noise and other operational trouble due to the circuit wiring.
A wide operating voltage range of 1.8V (2.0V) to 6.0V enables support for applications that require an alkaline battery (2-cell) or
AC adapter (5V) power supply. An internally fixed output voltage (0.8V to 4.0V) or an externally set output voltage can be selected.
The XCL208/XCL209 series uses synchronous rectification at an operating frequency of 3.0MHz. PWM control (XCL208) or
automatic PWM/PFM switching control (XCL209) can be selected. The XCL208 series has a fixed frequency, enabling the
suppression of output ripple. The XCL209 series achieves high efficiency while holding down output ripple across the full range of
loads, from light to heavy, enabling the extension of battery operation time.
Soft start and on/off functions with CL discharge are provided, and the IC can be put in the standby state by inputting a Low level
signal into the CE pin.
APPLICATIONS
Mobile phones, Smart phones
Bluetooth Headsets
Tablet PCs
PND
PC peripheral devices
DSC, Camcorders
TYPICAL APPLICATION CIRCUIT
FEATURES
Input Voltage
Fixed Output Voltage
High Efficiency
Output Current
Oscillation Frequency
CE Function
Protection Circuits
Control Methods
Operating Ambient Temperature
Package
Environmentally Friendly
: 1.8V ~ 6.0V (Type F)
: 2.0V ~ 6.0V (Type A/B)
: 0.8V ~ 4.0V (±2.0%)
: 90% (VIN=4.2V, VOUT=3.3V)
: 400mA
: 3.0MHz (±15%)
: Active High
Soft-start Circuit Built-in
CL High Speed Auto Discharge
: Current Limiter Built-in
(Constant Current & Latching)
: PWM (XCL208)
PWM/PFM (XCL209)
: -40+85
: USP-10B03
: EU RoHS Compliant, Pb Free
XCL208A / XCL208B / XCL209A / XCL209B Type
XCL208F / XCL209F Type
TYPICAL PERFORMANCE
CHARACTERISTICS
Efficiency vs. Output Current
XCL208x333DR/XCL209x333D
100
XCL209(PWM/PFM)
80
60
40
20
0
0.01
VIN= 4.2V
5.0V
XCL208(PWM)
V OUT =3.3V
0.1 1
10 100
Output Current:IOUT (mA)
1000
1/22




Torex Semiconductor

XCL208 Datasheet Preview

XCL208 Datasheet

400mA Inductor Built-in Step-Down micro DC/DC Converters

No Preview Available !

XCL208/XCL209 Series
BLOCK DIAGRAM
1)XCL208A / XCL209A Type
L1
VO UT
L2
LX
VIN PVSS
2) XCL208B / XCL209B Type
L1
VO UT
VIN
AVSS
CE AVSS
L2
LX
PVSS
CE
3)XCL208F / XCL209F Type
L1
FB
VIN
L2
LX
PVSS
AVSS
CE
NOTE:
The XCL208 offers a fixed PWM control, a signal from CE Control Logic to PWM/PFM Selector is fixed to "L" level inside. The XCL209 control
scheme is PWM/PFM automatic switching, a signal from CE Control Logic to PWM/PFM Selector is fixed to "H" level inside. The diodes placed
inside are ESD protection diodes and parasitic diodes.
2/22


Part Number XCL208
Description 400mA Inductor Built-in Step-Down micro DC/DC Converters
Maker Torex Semiconductor
Total Page 22 Pages
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