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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC470ITSTRT датащи(PDF) 1 Page - Semtech Corporation |
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SC470ITSTRT датащи(HTML) 1 Page - Semtech Corporation |
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1 / 31 page  1 www.semtech.com SC470 Synchronous Buck Controller for Dynamic Load-Voltage Applications POWER MANAGEMENT September 27, 2005 Description Features Applications The SC470 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. The excellent transient response means that SC470 based solutions will require less output capacitance than competing fixed frequency converters. The SC470 is specifically targeted for graphics processor power supplies that require dynamic voltage transition, with a tight 0.85% DC accuracy and a 20% OVP threshold. 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. At light loads, Power-Save Mode enables the SC470 to skip PWM pulses for better efficiency. The output voltage can be adjusted from 0.5V to VCCA. The integrated gate drivers feature adaptive shoot- through protection and soft switching. Additional features include cycle-by-cycle current limit, digital soft-start, over- voltage and under-voltage protection, and a PGD output. Graphics Cards Embedded Graphics Processors High Performance Processors Constant on-time for fast dynamic response Programmable VOUT range = 0.5 – VCCA VBAT range = 1.8V – 25V DC current sense using low-side RDS(ON) sensing or RSENSE in source of low-side MOSFET for greater accuracy Resistor programmable on-time Cycle-by-cycle current limit Digital soft-start Combined EN and PSAVE functions Over-voltage/under-voltage fault protection and PGD output 20% OVP threshold for simpler dynamic voltage transition circuitry 5µA typical shutdown current Low quiescent power dissipation 14 lead TSSOP and 16 pin MLPQ (4mm x 4mm) packages Industrial temperature range 0.85% DC accuracy Integrated gate drivers with soft-switching Typical Application Circuit 5VSUS 5VSUS VBAT R2 R1 RTON PGOOD R3 C4 1uF VOUT R4 L1 R2 C2 10uF U1 SC470 EN/PSV TON VOUT VCCA FB PGD VSSA PGND DL VDDP ILIM LX DH BST C6 1uF VOUT D1 R1 10R VBAT + C3 Q2 C1 0.1uF Q1 C5 1nF |
Аналогичный номер детали - SC470ITSTRT |
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Аналогичное описание - SC470ITSTRT |
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