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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SC1480ITSTRT 데이터시트(PDF) 1 Page - Semtech Corporation |
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SC1480ITSTRT 데이터시트(HTML) 1 Page - Semtech Corporation |
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1 / 22 page  1 www.semtech.com SC1480 DDR Memory Power Supply Controller POWER MANAGEMENT Revision: August 30, 2006 Description Features Applications Typical Application Circuit Notebook computers CPU I/O supplies Handheld terminals and PDAs LCD monitors Network power supplies Constant on-time for fast dynamic response Programmable VOUT based on external reference VIN range = 1.8V – 25V DC current sense using low-side RDS(ON) sensing or sense resistor 3mA reference output buffer Low power S3 state Resistor programmable frequency Cycle-by-cycle current limit Digital soft start Output current source-sink capability Overvoltage/under-voltage fault protection and PGOOD output Under 10uA typical shutdown current Low quiescent power dissipation 14-Pin TSSOP package. Also available in Lead-free package which is fully WEEE and RoHS compliant Industrial temperature range Integrated gate drivers with soft switching Efficiency >90% The SC1480 is a single output, constant on-time synchronous-buck, pseudo-fixed frequency, PWM controller intended for use in notebook computers and other battery operated portable devices. Features include high efficiency and fast dynamic response with no minimum on time, a reference input and a buffered REFOUT pin capable of sourcing 3mA. The excellent transient response means that SC1480 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. After the transient event, the controller frequency will return to steady state operation. The SC1480 incorporates two power-reducing states, standby and shutdown. In standby mode, the switcher output is shutdown but the buffered reference output stays up, reducing quiescent current to a low 125µA. This is particularly useful for reducing battery draw in systems which implement a suspend-to-RAM (S3) state. The SC1480 can be completely shut down, drawing less than 10µA. 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. R7 C9 C10 4.5V - 25V + C6 PGOOD +5VSB VDD = 2.5V R2 R4 C4 L1 R1 1.25VOUT C5 C2 R5 C3 U1 SC1480 1 2 3 4 5 6 7 8 9 10 11 12 13 14 REFIN TON REFOUT VCCA FBK PGOOD GND PGND DL VDDP ILIM LX DH BST C1 +5V D1 Q2 C7 R6 D2 Q1 C8 R3 REFOUT +5VRUN |
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