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XC9511E14SRL Datasheet(PDF) 1 Page - Torex Semiconductor |
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XC9511E14SRL Datasheet(HTML) 1 Page - Torex Semiconductor |
1 / 13 page February 2, 2004 V5 Synchronous Step-Down DC/DC Converter with built-in LDO Regulator in parallel plus Voltage Detector Preliminary ! Synchronous step-down DC/DC converter ! APPLICATIONS with built-in LDO regulator plus voltage detector " CD-R / RW, DVD ! Step-down DC/DC converter's output connected in parallel " HDD with LDO regulator " PDAs, portable communication modem ! SOP-8 package for high current " Cellular phones ! Small-footprint " Palmtop computers ! Output Current (DC/DC : 800mA, VR : 400mA) " Cameras, video recorders ! Ceramic capacitor compatible (Low ESR capacitors) ! GENERAL DESCRIPTION ! FEATURES Input Voltage Range : 2.4V ~ 6.0V Load Capacitors : Ceramic Capacitor Compatible (Low ESR Capacitors) VD Function : Detects output voltage from the VDOUT pin while sensing either VDD, DCOUT, or VROUT internally. Nch Open Drain Output <DC/DC Converter> Output Voltage Range : 0.9V ~ 4.0V (Accuracy ±2%) Output Current : 800mA Controls : PWM Control Oscillation Frequency : 300kHz, 600kHz, 1.2MHz <Regulator> Output Voltage Range : 0.9V ~ 4.0V (Accuracy ±2%) Current Limit 600mA Dropout Voltage : 160mV @ IOUT=200mA (VOUT=2.8V) High Ripple Rejection 60dB @1kHz (VOUT=2.8V) ! TYPICAL APPLICATION CIRCUIT ! TYPICAL PERFORMANCE CHARACTERISTICS XC9511 Series PWM, PWM / PFM Automatic Switching External The XC9511 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 XC9511 can deliver output currents up to 800mA at efficiencies over 90%. The XC9511 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 100mV 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. SOP-8 (TOP VIEW) Semiconductor Ltd. XC9511Axxxx 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 DC/DC Output Current IDOUT DC/DC Efficiency (DCOUT:3.3V, 1.2MHz) VIN=5.0V, Topr=25OC, L:4.7uH(CDRH4D28C) CIN:4.7uF(ceramic), CL1:10uF(ceramic), CL2:1uF(ceramic) 1 2 3 4 8 7 5 6 AVDD PVDD AGND LX DCOUT VROUT VDOUT PGND VROUT L CL2 DCOUT SD CIN1 ( ) CL1 CIN2 + + + + Data Sheet 1 |
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