XCL Comparison

NEED BETTER PERFORMANCE FROM YOUR MICRO DC/DC?

 

The market has recently seen an increase in the number of applications that now use Micro DC/DC technology, including wearable and wireless devices where size is at a premium and also industrial applications that require high levels of reliability.

 

In response to this Torex has extended its range of Micro DC/DCs to include the XCL220 and XCL222 series of parts. These new parts utilise Torex’s new Hi-SAT COT Control technology which provides a faster transient response and reduces the ON resistance of the internal transistor. For more information on the benefits of our Hi-SAT COT Technology click here.

The new XCL220 and XCL222 series are pin-compatible with the XCL202 and XCL206 series, our first generation of Micro DC/DC converters, and this eliminates the need for printed circuit board layout changes, making it easier to swap to the newer parts .

 

Product specifications

Comparison of XCL202 and XCL222 specifications

Series XCL202 XCL222
Oscillation Frequency 1.2MHz
Control Method PWM/PFM Automatic Hi-SAT COT +
PWM/PFM Automatic
Input Voltage Range 2.0V ~ 6.0V 2.5V ~ 5.5V
Output Current 400mA 500mA
Output Voltage Range 0.8V ~ 4.0V 0.8V ~ 3.6V
Operating Ambient Temperature -40oC ~ +85oC -40oC ~ +105oC
Lx SW "H" ON Resistance 0.35Ω 0.24Ω
Lx SW "L" ON Resistance 0.45Ω 0.16Ω

 

Comparison of XCL206 and XCL220 specifications

Series XCL206 XCL220
Oscillation Frequency 3.0MHz
Control Method PWM/PFM Automatic Hi-SAT COT +
PWM/PFM Automatic
Input Voltage Range 2.0V ~ 6.0V 2.5V ~ 5.5V
Output Current 600mA 1.0A
Output Voltage Range 0.8V ~ 4.0V 0.8V ~ 3.6V
Operating Ambient Temperature -40oC ~ +85oC -40oC ~ +105oC
Lx SW "H" ON Resistance 0.35Ω 0.24Ω
Lx SW "L" ON Resistance 0.45Ω 0.16Ω

 

CONVERSION EFFICIENCY

Comparison of XCL202 and XCL222 efficiency

|OUT XCL202 XCL222
0.1mA 68.3% 71.7%
1mA 84.9% 87.8%
10mA 86.8% 89.8%
100mA 87.8% 91.5%
200mA 85.8% 90.9%
300mA 82.5% 88.6%
400mA 78.9% 85.8%
500mA - 83.5%

Conditions:VIN=3.6V, VOUT=1.8V

 

Compared to the XCL202 series, the XCL222 series achieves high efficiency from light loads to heavy loads. By reducing the ON resistance of the internal transistor, self-heating is suppressed, and efficiency is significantly improved at IOUT = 50mA and higher, enabling a higher output current.

Comparison of XCL206 and XCL220 efficiency

|OUT XCL206 XCL220
0.1mA 59.2% 63.8%
1mA 82.2% 85.1%
10mA 85.5% 88.2%
100mA 86.1% 88.6%
200mA 84.4% 90.0%
300mA 82.2% 89.1%
600mA 74.3% 85.5%
1.0A - 77.6%

Conditions:VIN=3.6V, VOUT=1.8V

 

Compared to the XCL206 series, the XCL220 series achieves high efficiency from light loads to heavy loads. The coil inductance has been changed to 1.0μH to hold down dissipation due to DCR (equivalent series resistance) and other factors. By reducing the ON resistance of the internal transistor, self-heating is suppressed, and efficiency is significantly improved at IOUT = 100mA and higher, enabling a higher output current.

LOAD TRANSIENT RESPONSE

Comparison of load transient response of XCL202B181CR-G and XCL222B181ER-G

It can be seen from the VOUT waveform that the XCL222 series has a fast load transient response by means of Hi-SAT COT control.