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SC486 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC486 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 26 page  1 www.semtech.com SC486 Complete DDR1/2/3 Memory Power Supply POWER MANAGEMENT Revision: September 13, 2006 The SC486 is a combination switching regulator and linear source/sink regulator intended for DDR1/2/3 memory systems. The switching regulator is used to generate the supply voltage, VDDQ, for the memory system. It is a pseudo-fixed frequency constant on-time controller designed for high efficiency, superior DC accuracy, and fast transient response. The linear source/sink regulator is used to generate the memory termination voltage, VTT, with the ability to source and sink a 3A peak current. For the VDDQ regulator, the switching frequency is constant until a step in load or line voltage occurs at which time the pulse density, i.e. frequency, will increase or decrease to counter the transient change in output or input voltage. After the transient, the frequency will return to steady-state operation. At lighter loads, the selectable Power-Save Mode enables the PWM converter to reduce its switching frequency and improve efficiency. The integrated gate drivers feature adaptive shoot-through protection and soft-switching. For the VTT regulator, the output voltage tracks VREF, which is ½ VDDQ to provide an accurate termination voltage. The VTT output is generated from a 1.2V to VDDQ input by a linear source/sink regulator which is designed for high DC accuracy, fast transient response, and low external component count. Additional features include cycle-by-cycle current limiting, digital soft-start, power good (all VDDQ only) and over-voltage and under-voltage protection (VDDQ and VTT). All 3 outputs (VDDQ, VTT and REF) are actively discharged when VDDQ is disabled, reducing external component count and cost. The SC486 is available in a 24 pin MLPQ 4mmx4mm Lead-free package. Notebook computers CPU I/O supplies Handheld terminals and PDAs LCD monitors Network power supplies DDR1, DDR2 and DDR3 compatible Constant on-time controller for fast dynamic response on VDDQ Programmable VDDQ range - 1.5V to 3V 1% Internal Reference (2% System Accuracy) Resistor programmable on time for VDDQ VCCA/VDDP range = 4.5V to 5.5V VBAT range = 2.5V to 25V VDDQ DC current sense using low-side R DS(ON) sensing or external R SENSE in series with low-side FET Cycle-by-cycle current limit for VDDQ Digital soft-start for VDDQ Combined EN and PSAVE pin for VDDQ Over-voltage/under-voltage fault protection for both outputs and PGD output (VDDQ only) Separate VCCA and VDDP supplies VTT/REF range = 0.75V – 1.5V VTT source/sink 3A peak Internal resistor divider for VTT/REF VTT is high impedance in S3 VDDQ, VTT and REF are actively discharged in S4/S5 24-pin MLPQ (4 x 4mm) Lead-free package, fully WEEE and RoHS compliant + C10 VDDQ C12 1uF C11 20uF VTT C9 1uF R2 10R 5VRUN 5VSUS C3 no-pop R7 10R REF R6 10R C6 1uF R4 10R C2 1uF R5 R9 VDDQ PGOOD VBAT C8 1nF C1 no-pop C7 no-pop R8 0R VDDQ 4 1 2 3 5 6 7 8 Q1 R10 C13 1uF C4 0.1uF D1 R3 470k 5VSUS C5 10uF R1 VBAT L1 PGND1 18 REF 8 EN/PSV 1 TON 2 VDDQS 3 VCCA 5 FB 6 PGD 7 VSSA 4 PGND2 17 DL 19 VDDP 20 ILIM 21 LX 22 DH 23 BST 24 VTTEN 11 VTT 15 PGND2 16 VTTIN 12 VTTIN 13 VTT 14 VTTS 10 COMP 9 U1 SC486 Description Features Applications Typical Application Circuit |
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