Datasheet > SC1486_03

SC1486_03

更新时间： 2024-11-21 06:10:15

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
17页	334K
描述
Dual Synchronous Buck Pseudo Fixed Frequency DDR Power Supply Controller

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SC1486_03 数据手册

SC1486

Dual Synchronous Buck Pseudo Fixed

Frequency DDR Power Supply Controller

POWER MANAGEMENT

Description

Features

The SC1486 is a dual output constant on synchronous-

buck PWM controller optimized for cost effective mobile

DDR applications. Features include high efficiency, a fast

dynamic response with no minimum on time, a REFIN

input and a buffered REFOUT pin capable of sourcing

3mA. The excellent transient response means that

SC1486 based solutions will require less output

capacitance than competing fixed frequency converters.

Constant on-time for fast dynamic response

VIN range = 1.8V – 25V

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

or sense resistor

Integrated reference buffer for VTT

Low power S3 state

Resistor programmable frequency

Cycle-by-cycle current limit

Digital soft-start

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.

PSAVE option for VDDQ

Over-voltage/under-voltage fault protection

<20uA shutdown current

Low quiescent power dissipation

Two separate PGOOD indicators

Separate enable of each switcher

Integrated gate drivers with soft switching

Efficiency >90%

1% Internal reference

28 Lead TSSOP

Industrial temperature range

The output voltage of the first controller can be adjusted

from 0.5V to VCCA. In DDR applications, this voltage is

set to 2.5 volts. A resistor divider from the 2.5 volt supply

is used to drive the REFIN pin of the second controller. A

unity gain buffer drives the REFOUT pin to the same

potential as REFIN. The second controller regulates its

output to REFOUT. Two frequency setting resistors set

the on-time for each buck controller. The frequency can

thus be tailored to minimize crosstalk. 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 for each

controller.

Applications

Notebook computers

CPU I/O supplies

Handheld terminals and PDAs

LCD monitors

Typical Application Circuit

Network power supplies

PGOOD2

PGOOD1

TON1

PGOOD1

PGOOD2

VBAT

SC1486

TON2

VDDQ/2

REFIN

REFOUT

EN1

REFOUT

EN/PSV1

DH2

LX2

VTT, 1.25V

ILIM2

DL2

DH1

VDDQ, 2.5V

LX1

PGND2

FBK2

FBK1

PGND1

ILIM1

DL1

R11

PGND1

R10

Revision 5, January 2003

www.semtech.com

12 3 4 5 6 7...17

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与SC1486_03相关器件

型号	品牌	获取价格	描述	数据表
SC1486A	SEMTECH	获取价格	Dual Synchronous Buck DDR and DDR2 Power Supply Controller
SC1486A_06	SEMTECH	获取价格	Complete DDR1/2/3 Power Supply Controller
SC1486AEVB	SEMTECH	获取价格	Dual Synchronous Buck DDR and DDR2 Power Supply Controller
SC1486AITSTR	SEMTECH	获取价格	Dual Synchronous Buck DDR and DDR2 Power Supply Controller
SC1486AITSTRT	SEMTECH	获取价格	Dual Synchronous Buck DDR and DDR2 Power Supply Controller
SC1486ITSTR	SEMTECH	获取价格	Dual Synchronous Buck Pseudo Fixed Frequency DDR Power Supply Controller
SC1486ITSTRT	SEMTECH	获取价格	Dual Synchronous Buck Pseudo Fixed Frequency DDR Power Supply Controller
SC149B	POWEREX	获取价格	TRIAC, 200V V(DRM), 12A I(T)RMS
SC149B	ASI	获取价格	TRIAC, 200V V(DRM), 12A I(T)RMS,
SC149B-A	MOTOROLA	获取价格	TRIAC, 200V V(DRM), 12A I(T)RMS, TO-220AB,

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