Negative Output Voltage Integrated Inductor Micro DC-DC Converters
Torex Semiconductor Ltd. has launched the XCL303/XCL304 as a new series of integrated inductor negative output voltage micro dc-dc converters. The XCL303/XCL304 series are small coil-integrated negative voltage micro dc-dc converter IC.
Applications are expected to include optical transceivers, amplifiers, LCD displays, CCD cameras and sensors, as well as general-purpose negative output power supplies.
Increased oscillating frequency to 2.5MHz and by adopting the small package CL-2025-02(2.5 x 2.0 x 1.0mm), the mounting area is reduced by approximately 78% compared to general negative voltage output dc-dc (from 65.25mm2 to 14.43mm2).
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Mounting Area of XCL303/XCL304 Series
Further, integrating the coil together with the dc-dc simplifies the circuit board layout and minimizes potential noise interference.
Near Magnetic Field Noise of XCL303/XCL304 Series
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).
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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 -1.2V to -6.0V using externally mounted resistors.