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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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SC1486ITSTRT bảng dữ liệu(PDF) 1 Page - Semtech Corporation |
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SC1486ITSTRT bảng dữ liệu(HTML) 1 Page - Semtech Corporation |
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1 / 17 page  1 www.semtech.com SC1486 Dual Synchronous Buck Pseudo Fixed Frequency DDR Power Supply Controller POWER MANAGEMENT Revision 5, January 2003 Description Features Applications Typical Application Circuit The SC1486 is a dual output constant on synchronous- buck PWM controller optimized for cost effective mobile DDR 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 SC1486 based solutions will require less output capacitance than competing fixed frequency converters. The frequency is constant until a step in load or line voltage occurs at which time the pulse density and frequency will increase or decrease to counter the change in output or input voltage. 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. A resistor divider from the 2.5 volt 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. Additional features include cycle-by- cycle current limit, digital soft-start, overvoltage and under-voltage protection, and a PGOOD output for each controller. Notebook computers CPU I/O supplies Handheld terminals and PDAs LCD monitors Network power supplies 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 Resistor programmable frequency Cycle-by-cycle current limit Digital soft-start PSAVE option for VDDQ Over-voltage/under-voltage fault protection <20uA shutdown current Low quiescent power dissipation Two separate PGOOD indicators Separate enable of each switcher Integrated gate drivers with soft switching Efficiency >90% 1% Internal reference 28 Lead TSSOP Industrial temperature range PGOOD1 EN1 + C8 Q2 REFOUT R10 L1 Q1 R3 PGND1 VBAT VDDQ, 2.5V + C7 R11 R2 L2 VBAT VDDQ/2 Q4 PGND1 VTT, 1.25V SC1486 1 2 4 5 6 8 9 12 13 15 16 18 19 20 22 23 26 27 10 PGND1 DL1 ILIM1 LX1 DH1 REFIN TON2 FBK2 PGOOD2 PGND2 DL2 ILIM2 LX2 DH2 EN/PSV1 TON1 FBK1 PGOOD1 REFOUT Q3 R5 R4 PGOOD2 R1 R8 |
Số phần tương tự - SC1486ITSTRT |
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Mô tả tương tự - SC1486ITSTRT |
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