New Industry Products

Negative Output Voltage Integrated Inductor Micro DC-DC Converters

November 22, 2019 by Paul Shepard

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.

Typical application circuit.

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.