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XC9503 Datasheet(PDF) 1 Page - Torex Semiconductor |
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XC9503 Datasheet(HTML) 1 Page - Torex Semiconductor |
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1 / 30 page  Mar. 14, 2003 Ver. 2 Applications 2ch DC/DC Controller (Step-down + Step-down) PDAs Input Voltage Range 2.0V ~ 10.0V Palm Top Computers Output Voltage Externally Set-Up Digital Cameras Switching Frequency 300kHz (±15%) Various Multi-Function Power Supplies Maximum Duty Cycle 100% PWM, PWM/PFM Switching Control Features High Efficiency Step-down 92% (Typ.) Input Voltage Range : 2.0V ~ 10V Small MSOP-10 package Power Supply Voltage Range : 2.0V ~ 10V Output Voltage Range : 0.9V ~ 6.0V General Description Oscillation Frequency : 300kHz ±15% (180kHz, 500kHz custom) Output Current Stand-By Function : 3.0 µA (MAX.) Package : MSOP-10 Soft-Start Time : 10 ms (internally set) Typical Performance Characteristics Typical Application Circuit XC9503B093A Input : VOUT 1 : 3.3V, VOUT2 : 1.8V : more than 1000mA (VIN=5.0V, VOUT=3.3V) Noise is easily reduced with PWM control since the frequency is fixed. The series gives freedom to select control suited to the application. Soft-start time is internally set to 10msec and offers protection against in-rush currents when the power is switched on and also protects against voltage overshoot. XC9503 Series 2ch. Step-down DC/DC Controller ICs The XC9503 series are PWM controlled, PWM/PFM automatic switching controlled, multi-functional, 2 channel step-down DC/DC controller ICs. Since the series has a built-in 0.9V reference voltage (accuracy ±2%), 0.9V to 6.0V can be set using external components. With a 300kHz frequency, the size of the external components can be reduced. Switching frequencies of 180kHz & 500kHz are also available as custom- designed products. The control of the XC9503 series can be switched between PWM control and PWM/PFM automatic switching control using external signals. Control switches from PWM to PFM during light loads when automatic switching is selected and the series is highly efficient from light loads through to large output currents. Can be set freely with 0.9V (±2.0%) of reference voltage supply and external components. XC9503B093A (300kHz,VOUT1:3.3V) 0 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 1000 Output Current 1 IOUT1(mA) VIN=5.0V PWM PWM/PFM Switching L1=22 µH(CDRH5D28), CL1=47µF(Tantalum) SD1:MA2Q737, Tr1:XP162A1355P L1:22 µH CDRH5D28 Tr2:Pch MOSFET XP162A12A6P CIN :47 µF VIN =5.0V Tr1:Pch MOSFET XP162A12A6P SD2 :MA2Q737 SD1 :MA2Q737 RFB11 :200k Ω CFB1 :62pF RFB12 :75k Ω VOUT1:3.3V 1 EXT1/ 2 VDD 3 FB1 FB2 8 GND 9 EXT2/ 10 4 PWM1 PWM2 7 5 EN1 EN2 6 CL1: 47 µFX2 CL2: 47 µFX2 VPWM1 VPWM2 VEN2 VEN1 L2:22 µH CDRH5D28 VOUT2:1.8V RFB21 :220k Ω RFB22 :220k Ω CFB2 :62pF 1 |
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