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SC1486AEVB Datasheet(PDF) 1 Page - Semtech Corporation |
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SC1486AEVB Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 29 page  1 www.semtech.com SC1486A Dual Synchronous Buck DDR and DDR2 Power Supply Controller POWER MANAGEMENT Revision: June 22, 2004 Description Features Applications Typical Application Circuit The SC1486A is a dual output constant on-time synchronous buck PWM controller optimized for cost effective mobile DDR and DDR2 applications. Features include high efficiency, a fast dynamic response with no minimum on time, a REFIN input and a buffered REFOUT pin capable of sourcing 3mA. The excellent transient response means that SC1486A based solutions will require less output capacitance than competing fixed frequency converters. The output voltage of the first controller can be adjusted from 0.5V to VCCA. In DDR applications, this voltage is set to 2.5 volts, and in DDR2, 1.8V. A resistor divider from this supply is used to drive the REFIN pin of the second controller. A unity gain buffer drives the REFOUT pin to the same potential as REFIN. The second controller regulates its output to REFOUT. Two frequency setting resistors set the on-time for each buck controller. The frequency can thus be tailored to minimize crosstalk. The integrated gate drivers feature adaptive shoot-through protection and soft switching, requiring no gate resistors for the top MOSFET. Additional features include cycle- by-cycle current limit, digital soft-start, over-voltage and under-voltage protection, and a Power Good output for each controller. Notebook computers CPU I/O supplies Handheld terminals and PDAs 1% DC accuracy Compatible with DDR & DDR2 memory power requirements Constant on-time for fast dynamic response VIN range = 1.8V – 25V DC current sense using low-side RDS(ON) sensing or sense resistor Integrated reference buffer for VTT Low power S3 state with high-Z VTT Resistor programmable on-time Cycle-by-cycle current limit Digital soft-start PSAVE option for VDDQ Over-voltage/under-voltage fault protection <20µA shutdown current Low quiescent power dissipation Two Power Good indicators Separate enable for each switcher Integrated gate drivers with soft switching - no gate resistors required Efficiency >90% 28 Lead TSSOP (lead free available) D1 L1 R1 RTON1 C8 10uF C13 1uF C4 1uF PGOOD C5 1nF VTT VDDQ C1 0.1uF VDDQ 5VSUS 5VRUN VSSA2 VBAT R5 C2 10uF C12 100nF VBAT Q1 C10 1uF R6 0R VDDQ VSSA2 R8 10k R9 10R 5VSUS R3 VSSA1 PGOOD R7 Q3 VSSA1 VBAT 5VSUS L2 Q2 Q4 R2 10R VBAT + C3 5VSUS R14 0R R10 RTON2 R4 R12 10R U1 SC1486A 22 23 24 25 26 27 28 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 EN/PSV1 TON1 VOUT1 VCCA1 FB1 PGD1 VSSA1 PGND1 DL1 VDDP1 ILIM1 LX1 DH1 BST1 REFIN TON2 REFOUT VCCA2 FB2 PGD2 VSSA2 PGND2 DL2 VDDP2 ILIM2 LX2 DH2 BST2 VTT R11 D2 + C9 C6 1uF C11 1nF REFOUT R15 10k C7 0.1uF R13 C14 1uF |
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