XC9510

XC9510 Series Preliminary ! Input Voltage Range ! Output Voltage Range 2.4V ~ 6.0V DC/DC VR VD 0.9 ~ 4.0V ( ±2%) 0.9 ~ 4.0V (±2%) 0.9 ~ 5.0V (±2%) 800mA 600mA October 28, 2003 Ver. 4 Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator In Series plus Voltage Detector ! Switching Frequency ! Output Current ! Ultra Small Packages ! Ceramic Capacitor Compatible 300kHz, 600kHz, 1.2MHz DC/DC VR SOP-8 ! APPLICATIONS " CD-R / RW, DVD " HDD " PDAs, portable communication modem " Cellular phones " Palmtop computers " Cameras, video recorders ! GENERAL DESCRIPTION The XC9510 series consists of a step-down DC/DC converter and a high-speed LDO regulator connected in series with the DC/DC converter's output. A voltage detector is also built-in. A highly efficient, low noise output is possible since the regulator is steppeddown further from the DC/DC output. The DC/DC converter block incorporates a P-Channel driver transistor and a synchronous N-Channel switching transistor. With an external coil, diode and two capacitors, the XC9510 can deliver output currents up to 800mA at efficiencies over 90%. The XC9510 is designed for use with small ceramic capacitors. A choice of three switching frequencies are available, 300 kHz, 600 kHz, and 1.2 MHz. Output voltage settings for the DC/DC and VR are set-up internally in 0.1V steps within the range of 0.9V to 4.0V ( ± 2.0%). For the VD, the range is of 0.9V to 5.0V (± 2.0%). The soft start time of the series is internally set to ...