Analysis

Micro DC/DC converters with built-in negative output voltage

29th November 2019
Alex Lynn

Torex Semiconductor has launched the XCL303/XCL304 as a new series of inductor built-in negative output voltage micro DC/DC converters. The XCL303/XCL304 series are small coil-integrated negative voltage micro DC/DC converter IC. Increased oscillating frequency to 2.5MHz and by adopting the small package CL-2025-02(2.5x2.0x1.0mm), the mounting area is reduced by approximately 78%. 

Further, integrating the coil together with the DC/DC simplifies the circuit board layout and minimises potential noise interference. 

Compared to a charge pump type solution, the switching method of the XCL303/XCL304 maintains a stable output voltage even when the input voltage fluctuates. In addition, this new micro DC/DC can support maximum output current 300mA (when VIN = 3.3V, VOUT = -3.0V). 

The PWM controlled XCL303 series can be selected for applications where low noise is important, and the PWM/PFM automatic switching controlled XCL304 series can be selected for applications where high efficiency at light load current and low noise at high load current is important. 

The XCL303/XCL304 series allows users to select either a PWM control or PWM/PFM automatic switching control method, which are optimum for low noise and small negative voltage devices such as optical communication equipment. 

Output voltage can be adjusted within the range of -1.2 to -6.0V using externally mounted resistors.

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