SC470 Synchronous Buck Controller for Dynamic Load-Voltage Applications

PublishTime：2022-08-10

● Description:
■ 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.
● Features:
■ 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) sensingor RSENSE in source of low-side MOSFET forgreater accuracy
■ Resistor programmable on-time
■ Cycle-by-cycle current limit
■ Digital soft-start
■ Combined EN and PSAVE functions
■ Over-voltage/under-voltage fault protectionand PGD output
■ 20% OVP threshold for simpler dynamic voltagetransition 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

Brand of Product：	SEMTECH
Part#：	SC470 、 SC470IMLTRT(2)(3) 、 SC470ITSTRT(2)(3) 、 SC470EVB(4) More Part#
Product Category：	Synchronous Buck Controller More
Application：	[ Graphics Cards ][ Embedded Graphics Processors ][ High Performance Processors ] More
Data Type：	Datasheet More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：
Language：	English Chinese Chinese and English Japanese
Date of Creation：	September 27, 2005
Version Number：
Data Encoding：
Data Size：	1.1 MB

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