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XC9509D Datasheet(PDF) 1 Page - Torex Semiconductor |
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XC9509D Datasheet(HTML) 1 Page - Torex Semiconductor |
1 / 9 page September 30, 2003 Ver. 1 Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel plus Voltage Detector ! Input Voltage Range 2.4V ~ 6.0V " APPLICATIONS ! Output Voltage Range DC/DC 0.9 ~ 4.0V ( ±2%) # HDD VR 0.9 ~ 4.0V ( ±2%) # CD-R / RW, DVD VD 0.9 ~ 5.0V ( ±2%) # PDAs, portable communication modem ! Switching Frequency 300kHz, 600kHz, 1.2MHz # Cellular phones ! Output Current DC/DC 600mA # Palmtop computers VR 200mA # Cameras, video recorders ! Ultra Small Packages MSOP-10, USP-10 ! Ceramic Capacitor Compatible " GENERAL DESCRIPTION " FEATURES Input Voltage Range : 2.4V ~ 6.0V Load Capacitors : Ceramic Capacitors Compatible (Low ESR Capacitors) VD Function : Sense internally either VDD, DCOUT, or VROUT. Nch Open Drain Output <DC/DC Converter> Output Voltage Range : 0.9 ~ 4.0V ( ±2%) Output Current : 600mA Controls : PWM Control Oscillation Frequency : 300kHz, 600kHz, 1.2MHz <Regulator> Output Voltage Range : 0.9 ~ 4.0V ( ±2%) Current Limit 300mA Dropout Voltage : 80mV @ IOUT=100mA (VOUT=2.8V) High Ripple Rejection 60dB @1kHz (VOUT=2.8V) " TYPICAL APPLICATION CIRCUIT " TYPICAL PERFORMANCE CHARACTERISTICS XC9509 Series PWM, PWM / PFM Automatic Switching External The XC9509 series consists of a step-down DC/DC converter and a high-speed LDO regulator connected in parallel with the DC/DC converter's output. A voltage detector is also built-in. Since the input for the LDO voltage regulator block comes from the input power supply, it is suited for use with various applications. 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 XC9509 can deliver output currents up to 600mA at efficiencies over 90%. The XC9509 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 5ms. With the built- in U.V.L.O. (Under Voltage Lock Out) function, the internal P-channel driver transistor is forced OFF when input voltage becomes 1.4 V or lower. The functions of the MODE pin can be selected via the external control pin to switch the DC/DC control mode and the disable pin to shut down either the DC/DC block or the regulator block. MSOP-10 (TOP VIEW) LX DCOUT VROUT MODE AGND PGND CE PVDD AVDD 1 CL2 L CL1 SD 2 3 4 5 6 7 8 9 10 CIN2 VDOUT VROUT DCOUT Semiconductor Ltd. CIN1 XC9509Hxxxx 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 DC/DC Output Current IDOUT (mA) PWM/PFM Switching Control PWM Control DC/DC Efficiency (DCOUT:2.2V, 1.2MHz) VIN=3.6V, Topr=25OC, L:4.7uH(CDRH4D28C) CIN:4.7uF(ceramic), CL1:10uF(ceramic), CL2: 1uF(ceramic) Data Sheet 1 |
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