Products - Step-Down

XCL239 1A Step-Down Micro DC/DC with Integrated Inductor

1A Step-Down Micro DC/DC with Integrated Inductor image


Property XCL239
Output Current 1.0A
Input Voltage 2.5 ~ 5.5V
Output Voltage 0.8 ~ 3.6V
Oscillation Frequency 3MHz
Quiescent Current 600µA
Packages CL-2025-02

Product Description

1.0A HiSAT-COT Synchronous Step-Down Micro DC/DC Converter

  • XCL239 PWM only
  • XCL240 PWM/PFM (Auto Switching)

The XCL239/240 series is a high speed transient response 1.0A synchronous step-down Micro DC/DC converter with integrated inductor which fits in an extremely small 2.5mm x 2.0mm x 1.0mm CL-2025-02 package.

The extremely fast load transient performance is as a result of a new HiSAT-COT (Constant On Time) control method, which, when compared to standard COT control, provides less fluctuation in oscillation frequency against load and input voltage.

The input voltage range is 2.5V to 5.5V and the output voltage range is 0.8V to 3.6V (accuracy ±2.0%). Switching frequency is 3.0MHz and the operating ambient temperature range is -40°C ~ 105°C.

With the built-in UVLO function, the driver transistor is forced OFF when the input voltage becomes 1.95V or lower.


  • Input Voltage: 2.5V ~ 5.5V
  • Output Voltage: 0.8V ~ 3.6V
  • Output Current: 1.0A
  • Oscillator Frequency: 3MHz
  • HiSAT-COT Control
  • Built-in soft start circuit
  • CL-2025-02 Package

XCL219 Typical Application Circuit