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RT7274/79/80/81 系列为ACOT(Advanced Constant On-Time)操作模式之同步整流降压式直流转换器，输入电压4.5V至18V范围内，最大电流输出为2A。系统操作于ACOT模式下可在广负载变动范围内提供良好的瞬时响应，并于输出电容的选择上可选用具较小ESR的陶瓷电容，并确保整体系统表现的稳定性。此外，RT7274/79/80/81 在输入与负载变动情形下仍能提供良好的恒定操作频率表现，内建的整流开关可允许在输出在全负载变动范围内提供良好的转换效率。藉由侦测同步整流开关的端电压可达到逐周期形式的限流机制，并可藉由外部的电容设计达到缓启动效果，消除启动时产生过大的输入电涌。在保护机制方面，RT7274/79/80/81 均有过热保护功能，而RT7279/80 则另含有输出过电压保护功能。

应用

  • 工业和商用低功率系统
  • 计算机外设
  • 液晶显示器和电视
  • 节能电器设备
  • 高性能 DSP、FPGA、ASIC 使用的负载点调节器
主要规格
RT7274 RT7279 RT7280 RT7281
Status Active Active Active Active
Vin (min) (V) 4.5 4.5 4.5 4.5
Vin (max) (V) 18 18 18 18
Number of Outputs 1 1 1 1
Vout (min) (V) 0.765 0.765 0.765 0.765
Vout (max) (V) 8 8 8 8
Output Adj. Method Resistor Resistor Resistor Resistor
Iout (max) (A) 2 2 2 2
Current Limit (typ) (A) 3.5 3.5 3.5 3.5
Freq (typ) (kHz) 700 700 700 700
Ext Sync No No No No
Ron_HS (typ) (mOhm) 150 150 150 150
Ron_LS (typ) (mOhm) 105 105 105 105
Iq (typ) (mA) 0.7 0.7 0.7 0.7
Features ACOT Control;Adjustable Soft-Start;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;OCP;OTP;PSM;Power Good;Stable with Ceramic Capacitor;UVP ACOT Control;Adjustable Soft-Start;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;Force PWM;OCP;OTP;Power Good;Stable with Ceramic Capacitor;UVP ACOT Control;Adjustable Soft-Start;Enable Input;Fast Transient Response;OCP;OTP;PSM;Power Good;Stable with Ceramic Capacitor;UVP ACOT Control;Adjustable Soft-Start;Enable Input;Fast Transient Response;Force PWM;OCP;OTP;Power Good;Stable with Ceramic Capacitor;UVP
Package Type PSOP-8 TSSOP-14(PP);WDFN3x3-10 TSSOP-14(PP);WDFN3x3-10 PSOP-8
关键特性
  • 具ACOT™ 操作模式提供快速的瞬时响应
  • 4.5V 至 18V 输入电压范围
  • 最大2A 输出电流
  • 具有针对低占空比的应用的高效率内置N-MOSFET
  • 105mΩ的内部低端N-MOSFET
  • 进阶的恒定导通时间控制
  • 允许陶瓷电容作为输出电容
  • 700kHz切换频率
  • 可调输出电压范围0.765V 至 8V
  • 可调整设计的缓启动机制
  • 逐周期电流限制
  • 输入欠压闭锁
  • 过热保护
  • 符合RoHS规范与无卤特性
Evaluation Boards
TitleLast UpdateDownload
RT7279GQW Evaluation Board2015/05/15
RT7280GQW Evaluation Board2015/05/15
Reference Design
TitleLast UpdateDownload
立锜负载瞬变测试工具2018/11/01
Part NumberPackage TypePackage Qty.Free SampleDistributorStockBuy From Authorized Distributor
RT7274GSPPSOP-82,500 Request Digikey 458 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
RT7279GCPTSSOP-14(PP)2,500 Request Digikey 351 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
RT7279GQWWDFN3x3-101,500 Request Digikey 25,413 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
RT7280GQWWDFN3x3-101,500 Request Digikey 957 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
RT7281GSPPSOP-82,500 Request Digikey 2,397 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
Evaluation Board
Part NumberDistributorStockBuy From Authorized Distributor
EVB_RT7279GQW Digikey 2 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
EVB_RT7280GQW Digikey 5 Buy
Mouser Lead-Time: 14 weeks Not Available
WPG Lead-Time: 14 weeks Not Available
库存实际状况请联系代理商或业务窗口
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