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XC9508 Scheda tecnica(PDF) 1 Page - Torex Semiconductor |
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XC9508 Scheda tecnica(HTML) 1 Page - Torex Semiconductor |
1 / 36 page 1 Data Sheet ud200541 June 9, 2005 V7 ◆ Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator plus Voltage Detector ◆ Step-Down DC/DC Converter's Output Connected in Series with LDO Regulator ◆ High Efficiency, Low Noise Regulated Output ◆ Ultra Small Packages: MSOP-10, USP-10 ◆ Small-Footprint ◆ Output Current DC/DC:600mA, VR: 200mA ◆ Ceramic Capacitor Compatible (Low ESR Capacitors) ■ GENERAL DESCRIPTION The XC9508 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 stepped-down 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 XC9508 can deliver output currents up to 600mA at efficiencies over 90%. The XC9508 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 is set-up internally in 100mV steps within the range of 1.6V to 4.0V(± 2.0%) and for the VR are set-up internally 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 the regulator block. ■ APPLICATIONS ● CD-R / RW, DVD ● HDD ● PDAs, portable communication modem ● Cellular phones ● Palmtop computers ● Cameras, video recorders ■ TYPICAL APPLICATION CIRCUIT ■ FEATURES Input Voltage Range : 2.4V ~ 6.0V Low ESR Capacitor : Ceramic capacitor compatible VD Function : N-channel open drain output <DC/DC Converter Block> Output Voltage Range : 1.6V ~ 4.0V (Accuracy ± 2%) Output Current : 600mA (for MSOP-10 package) 400mA (for USP-10 package) Controls : PWM Control PWM, PWM/PFM Automatic Switching External Oscillation Frequency : 300kHz, 600kHz, 1.2MHz <Regulator Block> Output Voltage Range : 0.9V ~ 4.0V (Accuracy ± 2%) Current Limit : 300mA Dropout Voltage : 80mV @ IOUT=100mA (VOUT=2.8V) High Ripple Rejection : 60dB @1kHz (VOUT=2.8V) ■ TYPICAL PERFORMANCE CHARACTERISTICS XC9508Cxxxx VIN=3.6V, Topr=25OC L=4.7μH (CDRH4D28C) CIN:4.7μF ‘(ceramic), CL1:10μF (ceramic), CL2: 4.7μF (ceramic) * Please refer to the typical application circuit when external components are selected. MSOP-10 (TOP VIEW) |
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