Torex Announces Coil-Integrated Step-Down micro DC-DC Converters
Torex Semiconductor Ltd. has developed a new step-down micro dc-dc converter with integrated coil. The XCL201/XCL202 series expands our lineup of step-down micro dc-dc converters with integrated coil. Like our previous converters, an ultra-small size has been achieved with dimensions of 2.5 x 2.0 x h1.0mm, enabling these converters to make a huge contribution to the development of smaller and more lightweight portable devices.
A power source with a maximum load current of 400mA can be configured by simply adding two ceramic capacitors to the micro dc-dc. The operating voltage range is 2.0 to 6.0V. The output voltage is fixed and can be selected in steps of 0.05V within a range 0.8 to 4.0V (accuracy ±2.0%). The IC operates at a switching frequency of 1.2MHz (accuracy ±15%) and uses synchronous rectification with an internal 0.42Ω P-ch driver transistor and 0.52Ω N-ch switch transistor. For the operation mode, PWM control (XCL201) or PWM/PFM auto switching control (XCL202) can be selected. The XCL202 freely responds at high speed to a full range of loads from light loads to heavy loads, achieves low ripple and high efficiency, and reduces quiescent current to 1.0µA or less by turning off all circuits during standby. A switching frequency of 1.2MHz is used to improve overall efficiency by around 3% compared to the previous XCL205/XCL206/XCL207. An internal under-voltage lockout (UVLO) function forcibly turns off the internal driver transistor when the input voltage is 1.4V or less.
An internal high-speed soft-start function starts the output voltage at 0.25ms (TYP). A CL discharge function discharges the charge of the load capacitance CL by turning on an internal switch during standby. This makes it possible to rapidly return the output voltage to the VSS level. This environmentally friendly product complies with the EU RoHS directive and is Pb free.
