0.5A Inductor Built-in Step-Down “micro DC/DC” Converters
The XCL221 series is a synchronous step-down micro DC/DC converter which integrates an inductor and a control IC in one tiny package (2.0mm×2.5mm, h=1.0mm). 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 2.5V to 5.5V enables support for applications that require an internally fixed output voltage (0.8V to 3.6V). The XCL221 series uses synchronous rectification at an operating frequency of 1.2MHz. The XCL221 series uses HiSAT-COT(*) synchronous rectification.
The series have a high speed soft-start as fast as 0.25ms (TYP.) in typical for quick turn-on. With the built-in UVLO (Under Voltage Lock Out) function, the internal P-channel driver transistor is forced OFF when input voltage becomes 2.0V or lower. When CE=Low, the integrated CL discharge function which enables the electric charge at the output capacitor CL to be discharged via the internal discharge switch located between the LX and GND pins. The power consumption will be less than 1.0μA.
(*) HiSAT-COT is an original Torex term for High Speed Transient Response.
|Jul 1, 2015||
|Low noise, higher efficiency with our unique fast transient response control！Step-down "micro DC/DC" converter with integrated 500mA output current coil|
Typical Application Circuit
|Input Voltage Range||2.5V～5.5V|
|Control Methods||HiSAT-COT Control
100% Duty cycle
|Protection Circuits||Thermal Shut Down
Current Limit Circuit (Drop)
Short Circuit Protection
|Capacitor||Low ESR Ceramic|
|Operating Ambient Temperature||-40℃～+105℃|
|Environmentally Friendly||EU RoHS compliant, Pb free|
|Package||CL-2025-02||Number of Pins||6|
|Pcs/Reel||3,000||Package Size(mm)||2.0 x 2.5 x 1.04|
What is the soft-start function?
The function to soften the rise to prevent the inrush current.