SC1485

更新时间： 2024-11-10 22:43:27

品牌	Logo	应用领域
商升特 - SEMTECH		控制器
页数	文件大小	规格书
17页	363K
描述
Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller

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SC1485 数据手册

SC1485

Dual Synchronous Buck Pseudo Fixed

Frequency Power Supply Controller

POWER MANAGEMENT

Description

Features

The SC1485 is a dual output constant on synchronous- ꢀ Constant on-time for fast dynamic response

buck PWM controller intended for use in notebook ꢀ Programmable VOUT range = 0.5 – VCCA

computers and other battery operated portable devices. ꢀ VIN Range = 1.8V – 25V

Features include high efficiency and a fast dynamic ꢀ DC current sense using low-side RDS(ON)

response with no minimum on time. The excellent

sensing or sense resistor

transient response, means that SC1485 based solutions ꢀ Resistor programmable frequency

will require less output capacitance than competing fixed ꢀ Cycle-by-cycle current limit

frequency converters.

ꢀ

Digital soft-start

ꢀ

Separate PSAVE option for each switcher

The frequency is constant until a step in load or line voltage ꢀ Over-voltage/Under-voltage fault protection

occurs at which time the pulse density and frequency will ꢀ 10uA Typical shutdown current

increase or decrease to counter the change in output or ꢀ Low quiescent power dissipation

input voltage. After the transient event, the controller ꢀ Two PGOOD indicators

frequency will return to steady state operation. At light ꢀ 1% Reference (2% system DC accuracy)

loads, Power-Save Mode enables the SC1485 to skip ꢀ Efficiency >90%

PWM pulses for better efficiency.

ꢀ

Integrated gate drivers with soft switching

Separate enables

Each output voltage can be independently adjusted from ꢀ 28 Lead TSSOP

0.5V to VCCA. Two frequency setting resistors set the ꢀ Industrial temperature range

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

Applications

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, over-voltage and under-

voltage protection, and a PGOOD output for each

controller.

ꢀ

Notebook computers

CPU I/O supplies

Handheld terminals and PDAs

LCD monitors

Network power supplies

Typical Application Circuit

PGOOD1

PGOOD2

VBAT

TON1

PGOOD1

PGOOD2

VBAT

SC1485

TON2

EN2

EN1

EN/PSV2

EN/PSV1

DH2

LX2

VOUT2

DH1

ILIM2

DL2

VOUT1

LX1

ILIM1

DL1

PGND2

FBK2

FBK1

PGND1

Revision: October 14, 2004

www.semtech.com

12 3 4 5 6 7...17

中文翻译

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与SC1485相关器件

型号	品牌	获取价格	描述	数据表
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
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

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