For Thin Electronic Devices, Negative Output Voltage Expanded Lineup of DC/DC Converters XC9307/XC9308 Series

Torex Semiconductor Ltd. (Tokyo Japan: President, Koji Shibamiya, 6616: 1st section at Tokyo Stock Exchange) has launched the XC9307/XC9308 series as a new series of negative output voltage DC/DC converters.　

The XC9307/XC9308 series are negative voltage output DC/DC converters in a small and thin package of 1.8 x 2.0 x 0.4mm. (Fig.1 and Fig.2) Increasing oscillating frequency to 2.5MHz, small parts with height of 0.65 mm or less can be used with including the external coils and capacitors required for DC/DC converters. The mounting area is reduced by approximately 70% (65.25mm² to 19.11mm²) compared to general negative voltage output DC/DC, which can contribute to downsizing and thinning of electronic devices. (Fig. 3)

Compared to a charge pump type solution, the switching method of the XC9307/XC9308 maintains a stable output voltage even when the input voltage fluctuates. In addition, this new DC/DC converters can support maximum output current 300mA (when V_IN = 3.3V, V_OUT = -3.0V).
Output votage can be adjusted within the range of -1.2V to -6.0V using externally mounted resistors.

The PWM controlled XC9307 series can be selected for applications where low noise is important, and the PWM/PFM automatic switching controlled XC9308 series can be selected for applications where high efficiency at light load current and low noise at high load current is important.

Fig1.Appearance of Package USP-6EL

Fig2. Information of Package USP-6EL

Fig3. Mounting Area of XC9307/XC9308