Support for 12V and 24V Input Lines Expanded Lineup of Step-Down Synchronous DC/DC Converters XC9268 Series

Jun 7, 2019

Torex Semiconductor Ltd. (Tokyo Japan: President, Koji Shibamiya, 6616: 1st section at Tokyo Stock Exchange) has launched the XC9268 series of step-down synchronous DC/DC converters compatible with 36V input and 600mA output, for industrial equipment and consumer appliances having an input source of 12V or 24V.

The XC9268 series has a maximum input voltage of 36V, making it ideal for use as a power supply for step-down from a 12V or 24V line. Its low minimum input voltage of 3.0V makes a MAX Duty of 100% possible, so it can also be applied as a component in an input OR circuit used with a backup line.

The operation mode is PWM / PFM automatic switching control. 83% (VIN = 12V, VOUT = 5.0V, IOUT = 1mA) efficiency is realized in the standby load state such as microcontroller. In addition, even with heavy load in the active state, it achieves 85% or more efficiency and high efficiency is realized in the entire load area. ( Figure 1)

Figure1 Efficiency--Output Current Graph

Its output current is 600mA, and when compared with voltage regulators conventionally, its high-efficiency power supply circuit generates less heat, with reduced mounting space at 1/4 the required space of past products. (Figure 2)

Figure2 Efficiency--Output Current Graph

The switching frequency can be selected from either 1.2MHz or 2.2MHz and since it operates by PWM control. The soft-start time has been set internally to be 2.0ms (Typ.), but a time longer than the internal soft-start can be set optionally depending on the resistance and capacity connected to the EN/SS terminal.

The compact USP-6C package with the power Good function eliminates the need of a voltage detector to monitor output voltage, allowing the reduction of external component t counts. The Power good function and external soft-start function make the sequence control easy. The protective circuits of an overcurrent protection and a thermal shutdown which are built into these products enable safe use.


Input Voltage Range 3.0 ~ 36V (Absolute Max 40V)
Output Voltage Range 1.0V ~ 25V
FB Voltage 0.75V ± 1.5%
Oscillation Frequency 1.2MHz
Output Current 600mA
Quiescent Current 12.5μA (1.2MHz)
13.5μA (2.2MHz)
Control Methods PWM/PFM Auto
Efficiency 83%@12V→5V、1mA
Soft-start Time Adjustable by RC
Protection Circuits Over Current Protection
Thermal Shutdown
Output Capacitor Ceramic Capacitor
Operating Ambient Temperature - 40℃ ~ + 105℃