Products - Step-Down

XC9273 5.5V 3A Hi-SAT COT Step-Down DC/DC Converter

5.5V 3A Hi-SAT COT Step-Down DC/DC Converter image


Property XC9273
Output Current 3.0A
Input Voltage 2.7V~5.5V
Output Voltage 0.8V~3.6V
Oscillation Frequency 1.2MHz, 3.0MHz
Quiescent Current 40μA
Package QFN0404-24C

Product Description

The XC9273 incorporates Hi-SAT COT, Torex’s own Constant On-Time architecture, to deliver extremely fast transient response performance and high efficiency.

With Hi-SAT the XC9273 only needs one low cost 47μF ceramic capacitor at the output side, whilst competitors often need multiple capacitors to achieve similar levels of performance. However adding an extra capacitor will allow the user to reduce output ripple further if required.

Hi-SAT COT also provides less fluctuation in oscillation frequency against load and input voltage when compared to traditional COT control architectures.

With a 0.6V reference voltage source the output voltage can be set freely from 0.8V using external resistors. Furthermore, it is possible to control the output voltage dynamically using an external digital-to-analog converter (DAC).

The XC9273 also allows the engineer to select different features using the MODE pins. Using a High or Low signal the engineer can select PWM control or PWM/PFM auto switching control (MODE1), Short Protection with latch or hiccup mode (MODE2) and optional CL discharge with soft OFF (MODE3).

The integral soft start time can be adjusted with an external capacitor (CSS) and a Power Good feature is also included to help with system power-up sequencing.