一，方案概述：

SY8088，SY8089是矽力杰(Silergy)公司推出的两款款1.5MHz高效同步压降DC/DC稳压器芯片，其输入电压可在2.5V到5.5V范围内变动，该芯片集成了主开关及同步开关等以减少电源损失，其主要应用于：手提电脑、机顶盒、USB电子狗、媒体播放器、智能手机等中。

SY8088：Input 2.5~5.5V，1.5MHz，1.2A低压高频同步降压DC/DC，小封装：SOT23-5；

SY8089：Input 2.5~5.5V，1.5MHz，2A低压高频同步降压DC/DC，小封装：SOT23-5；

二、方案框图：

SY8088的主要功能特性包括：

1、Low RDS(ON) for internal switches (top/bottom) 260mΩ/170mΩ

2、2.5~5.5V input voltage range

3、40µA typical quiescent current

4、High light load efficiency

5、High switching frequency 1.5MHz minimizes the external components 

6、Internal soft-start limits the inrush current

7、100% dropout operation

8、RoHS Compliant and Halogen Free

9、Compact package: SOT23-5

 方案描述：

方案关键器件表

SY8088

General Description    

SY8088 is a high efficiency 1.5MHz synchronous step down DC/DC regulator IC capable of delivering up to 1A output current. It can operate over a wide input voltage range from 2.5V to 5.5V and integrate main switch and synchronous switch with very low RDS (ON) to minimize the conduction loss.   

Ordering Information  

Package Code   Temperature  CodeOptional Spec Code( ) SY8088   Temperature Range: -40°C to 85°C Features    

 Low RDS(ON) for internal switches (top/bottom) 260m/170m   2.5~5.5V input voltage range  40A typical quiescent current  High light load efficiency   High switching frequency 1.5MHz minimizes the external components     Internal soft-start limits the inrush current  100% dropout operation   RoHS Compliant and Halogen Free  Compact package: SOT23-5   

Applications    

ortable Navigation Device   

Set Top Box   

USB Dongle  

Media Player  

Smart phone

SY8089

General Description   

The SY8089 and SY8089A are high-efficiency, high frequency synchronous step-down DC-DC regulator IC capable of delivering up to 2A output current. The SY8089 and SY8089A operate over a wide input voltage range from 2.7V to 5.5V and integrate main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss.    Low output voltage ripple and small external inductor and capacitor sizes are achieved with greater than 1MHz switching frequency.   SY8089 integrates short circuit and over-voltage latch off protection.    

Ordering Information    

Package Code   Temperature  CodeOptional Spec Code SY8089  Temperature Range: -40°C to 85°C Ordering Number Package type Note SY8089AAC SOT23-5  SY8089AAAC SOT23-5   

Features     

• Low RDS(ON) for internal switches  (top/bottom):110mΩ/80mΩ  

• 2.7-5.5V input voltage range  

• 2A continuous, 3A peak load current capability 

• 1MHz switching frequency minimizes the external components  

• Internal softstart limits the inrush current 

• Reliable short circuit protection:   

SY8089: Latch off protection    

SY8089A: Hic-cup mode protection 

• Reliable over-voltage protection:   

SY8089: Latch off protection  

SY8089A:  No latch off protection 

• 100% dropout operation  

• RoHS Compliant and Halogen Free 

• Compact package: SOT23-5    

Applications   

• LCD TV 

• Set Top Box 

• Net PC  

• Mini-Notebook PC 

• Access Point Router

矽力杰公司主要从事WIFI、蓝牙、2.4G等高科技无线电子产品的研发、生产和销售，主要产品有WIFI放大器、WIFI移动硬盘、蓝牙防丢器、蓝牙定位器、蓝牙电子烟等无线智能家居等高科技产品。