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 ranging from 0.5V to 36.0V input. These new parts utilise Torex’s 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 XCL240 and XCL242 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 XCL242 specifications

Series	XCL202	XCL242
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	-40^oC ~ +85^oC	-40^oC ~ +105^oC
Lx SW "H" ON Resistance	0.35Ω	0.24Ω
Lx SW "L" ON Resistance	0.45Ω	0.16Ω

Comparison of XCL206 and XCL240 specifications

Series	XCL206	XCL240
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	-40^oC ~ +85^oC	-40^oC ~ +105^oC
Lx SW "H" ON Resistance	0.35Ω	0.24Ω
Lx SW "L" ON Resistance	0.45Ω	0.16Ω

CONVERSION EFFICIENCY

Comparison of XCL202 and XCL242 efficiency

\|_OUT	XCL202	XCL242
0.1mA	68.3%	69.9%
1mA	84.9%	86.8%
10mA	86.8%	89.0%
100mA	87.8%	89.2%
200mA	85.8%	89.3%
300mA	82.5%	88.3%
400mA	78.9%	86.7%
500mA	-	84.8%

Conditions:V_IN=3.6V, V_OUT=1.8V

Compared to the XCL202 series, the XCL242 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 XCL240 efficiency

\|_OUT	XCL206	XCL240
0.1mA	59.2%	61.2%
1mA	82.2%	85.2%
10mA	85.5%	88.6%
100mA	86.1%	89.0%
200mA	84.4%	89.5%
300mA	82.2%	89.0%
600mA	74.3%	84.9%
1.0A	-	78.3%

Conditions:V_IN=3.6V, V_OUT=1.8V

Compared to the XCL206 series, the XCL240 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 XCL242B181ER-G

It can be seen from the VOUT waveform that the XCL242 series has a fast load transient response by means of Hi-SAT COT control.

XCL Comparison