Non-synchronous step-down regulators

10 September 2003 Power Electronics / Power Management

The XC9206, XC9207 and XC9208 are three non-synchronous stepdown DC-DC converters from Torex Semiconductor. Featuring a high switching frequency up to 1,2 MHz and a built-in 0,4 W P-channel driver transistor, the converters enable a high efficiency, stable power supply with an output current of 500 mA to be configured using only a coil, a diode and two small capacitors connected externally. The devices use the latest current/voltage multiple feedback technique allowing ceramic capacitors, rather than expensive tantalums, to be used to stabilise their output. Input voltage range is from 1,8 to 6,0 V. Output voltage is internally programmable from 0,9 to 4,0 V in incremental steps of 0,1 V, and oscillation frequency is selectable (300 kHz, 600 kHz, 1,2 MHz). The XC9206 offers a basic pulse width modulation (PWM) operating mode. Both the XC9207 and XC9208 have a PWM to pulse frequency modulation (PFM) switching facility, allowing them to operate at maximum efficiency, over a broad range of output loads. PWM to PFM switching is automatic on the XC9207 while the XC9208 uniquely boasts external control of PWM ot PFM mode switching, allowing designers flexibility in tailoring the converter exactly to the needs of their application.

Prime Semiconductors, 011 447 6527

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