400mA Inductor Built-in Step-Down “micro DC/DC” Converters
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.
●Mobile phones, Smart phones
●PC peripheral devices
■TYPICAL APPLICATION CIRCUIT
Fixed Output Voltage
Operating Ambient Temperature
: 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)
: 3.0MHz (±15%)
: Active High
Soft-start Circuit Built-in
CL High Speed Auto Discharge
: Current Limiter Built-in
(Constant Current & Latching)
: PWM (XCL208)
: EU RoHS Compliant, Pb Free
XCL208A / XCL208B / XCL209A / XCL209B Type
XCL208F / XCL209F Type
■ TYPICAL PERFORMANCE
●Efficiency vs. Output Current
V OUT =3.3V
Output Current:IOUT (mA)