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SC1480AEVB

更新时间： 2024-11-21 04:05:35

品牌	Logo	应用领域
商升特 - SEMTECH		双倍数据速率控制器
页数	文件大小	规格书
23页	343K
描述
DDR and DDR Memory VTT power Supply Controller

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SC1480AEVB 数据手册

SC1480A

DDR and DDR2 Memory VTT

Power Supply Controller

POWER MANAGEMENT

Description

ꢀeatures

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

REꢀOUT pin capable of sourcing 3mA. The excellent

transient response means that SC1480A based solutions

will require less output capacitance than competing fixed

frequency converters.

u Compatible with DDR & DDR2 memory power

requirements

u Constant on-time for fast dynamic response

u Programmable VOUT based on external reference

u VBAT range = 1.8V 25V

u DC current sense using low-side RDS(ON) sensing

or sense resistor

u 3mA reference output buffer

u Low power S3 state

u Resistor programmable frequency

u Cycle-by-cycle current limit

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.

u Digital soft start

u Output current source-sink capability

u Overvoltage/under-voltage fault protection and

PGOOD output

u Under 10uA typical shutdown current

u Low quiescent power dissipation

u 14 Lead TSSOP

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.

u Industrial temperature range

u Integrated gate drivers with soft switching

u Efficiency >80%

Applications

u Notebook computers

u CPU I/O supplies

u Handheld terminals and PDAs

The integrated gate drivers feature adaptive shoot-

through protection and soft switching. Additional features u LCD monitors

include cycle-by-cycle current limit, digital soft-start,

u Network power supplies

overvoltage and under-voltage protection, and a PGOOD

output.

Typical Application Circuit

VDDQ

VBAT

5VSUS

5VRUN

VBAT

C1 0u1

10k0

RTON

10R

REFIN

SC1480A

BST

10u

TON

VTT

REFOUT

VCCA

ILIM

R5 RLIM

VTT

VDDP

PGOOD

PGD

VSSA

PGND

0u1

10k0

10R

Revision: December 8, 2004

www.semtech.com

12 3 4 5 6 7...23

中文翻译

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与SC1480AEVB相关器件

型号	品牌	获取价格	描述	数据表
SC1480AITSTRT	SEMTECH	获取价格	DDR and DDR Memory VTT power Supply Controller
SC1480EVB	SEMTECH	获取价格	DDR Memory Power Supply Controller
SC1480ITSTR	SEMTECH	获取价格	DDR Memory Power Supply Controller
SC1480ITSTRT	SEMTECH	获取价格	DDR Memory Power Supply Controller
SC1485	SEMTECH	获取价格	Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller
SC1485_05	SEMTECH	获取价格	Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller
SC1485ITSTR	SEMTECH	获取价格	Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller
SC1485ITSTRT	SEMTECH	获取价格	Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller
SC1486	SEMTECH	获取价格	Dual Synchronous Buck Pseudo Fixed Frequency DDR Power Supply Controller
SC1486_03	SEMTECH	获取价格	Dual Synchronous Buck Pseudo Fixed Frequency DDR Power Supply Controller

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