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SC1480AEVB Datasheet(PDF) 1 Page - Semtech Corporation |
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SC1480AEVB Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 23 page  1 www.semtech.com SC1480A DDR and DDR2 Memory VTT Power Supply Controller POWER MANAGEMENT Revision: December 8, 2004 Description .eatures Applications Typical Application Circuit K Notebook computers K CPU I/O supplies K Handheld terminals and PDAs K LCD monitors K Network power supplies K Compatible with DDR & DDR2 memory power requirements K Constant on-time for fast dynamic response K Programmable VOUT based on external reference K VBAT range = 1.8V 25V K DC current sense using low-side RDS(ON) sensing or sense resistor K 3mA reference output buffer K Low power S3 state K Resistor programmable frequency K Cycle-by-cycle current limit K Digital soft start K Output current source-sink capability K Overvoltage/under-voltage fault protection and PGOOD output K Under 10uA typical shutdown current K Low quiescent power dissipation K 14 Lead TSSOP K Industrial temperature range K Integrated gate drivers with soft switching K Efficiency >80% The SC1480A 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. .eatures include high efficiency and fast dynamic response with no minimum on time, a reference input and a buffered RE.OUT pin capable of sourcing 3mA. The excellent transient response means that SC1480A 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 SC1480A 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 SC1480A 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. REFIN 1 TON 2 REFOUT 3 VCCA 4 FB 5 PGD 6 VSSA 7 PGND 8 DL 9 VDDP 10 ILIM 11 LX 12 DH 13 BST 14 U1 SC1480A Q1 Q2 C7 1u C6 1n R7 10R R4 10R R3 R2 RTON R1 10k0 R6 10k0 VTT VDDQ VBAT 5VSUS PGOOD C3 1u REFOUT C5 1u R5 RLIM D1 C1 0u1 5VRUN C2 10u VBAT L1 + C4 VTT C8 0u1 |
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