Products - Step-Down

XC9257 1.0A Hi-SAT COT Synchronous Step-Down DC/DC Converter

1.0A Hi-SAT COT Synchronous Step-Down DC/DC Converter image


Property XC9257
Output Current 1000mA
Input Voltage 2.5 ~ 5.5V
Output Voltage 0.8 ~ 3.6V
Oscillation Frequency 1.2MHz, 6.0MHz
Quiescent Current 250µA
Packages SOT-25, USP-6C

Product Description

1.0A Hi-SAT COT Synchronous Step-Down DC/DC Converter

  • XC9257 PWM only
  • XC9258 PWM/PFM (Auto Switching)

The XC9257/XC9258 series is a high speed transient response 1.0A synchronous step-down DC/DC converter. The extremely fast load transient performance is as a result of a new Hi-SAT 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%). 1.2MHz or 6.0MHz can be selected for the oscillation frequency and the operating ambient temperature range is -40°C ~ 105°C.

The soft-start time is set to 0.3ms (TYP.). With the built-in UVLO function, the driver transistor is forced OFF when the input voltage becomes 1.6V or lower.


  • Input Voltage: 2.5V ~ 5.5V
  • Output Voltage: 0.8V ~ 3.6V
  • Output Current: 1.0A
  • Oscillator Frequency: 1.2MHz, 6MHz
  • Current Consumption: 250uA (1.2MHz)
  • Hi-SAT COT Control
  • Compatible with ceramic capacitors
  • Built-in soft start circuit
  • SOT-25 and USP-6C Packages

Need more Integration ?

For additional space saving take a look at the XCL219 Micro DC/DC with integrated inductor! The XCL219 is available in a small CL-2025-02 package measuring 2.5mm x 2.0mm x 1.0mm. Needs only two external capacitors!