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RT7257B为高效率的DC/DC单芯片同步降压型转换器，输入电压范围从4.5V至18V，输出电流至3A。RT7257B的电流模式架构与外部的补偿机制可因应大范围的输入与负载变化的瞬时响应进行优化的补偿。逐周期形式的限流机制可在输出短路时提供电路保护作用，缓启动机制则可消除启动瞬间的输入电流涌浪的问题。此外RT7257B提供低电压保护与热关断保护功能，低电流消耗(<3μA)的关断模式则可断开与输出的连接，实现简易的电池供电系统中的电源管理。RT7257B采用SOP-8(裸露焊盘)的封装规格。

应用

  • Wireless AP/Router
  • Set-Top-Box
  • Industrial and Commercial Low Power Systems
  • LCD Monitors and TVs
  • Green Electronics/Appliances
  • Point of Load Regulation of High-Performance DSPs
主要规格
RT7257B
Status Active
Vin (min) (V) 4.5
Vin (max) (V) 18
Number of Outputs 1
Vout (min) (V) 0.8
Vout (max) (V) 12
Output Adj. Method Resistor
Iout (max) (A) 3
Current Limit (typ) (A) 5.1
Freq (typ) (kHz) 1200
Ext Sync No
Ron_HS (typ) (mOhm) 110
Ron_LS (typ) (mOhm) 90
Iq (typ) (mA) 0.8
Features Adjustable Soft-Start;Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;OCP;OTP;PSM;Stable with Ceramic Capacitor;UVP
Package Type PSOP-8
关键特性
  • ±1.5% High Accuracy Reference Voltage
  • 4.5V to 18V Input Voltage Range
  • 3A Output Current
  • Integrated N-MOSFET Switches
  • Current Mode Control
  • Fixed Frequency Operation : 1.2MHz
  • Output Adjustable from 0.8V to 12V
  • Up to 95% Efficiency
  • Programmable Soft-Start
  • Stable with Low ESR Ceramic Output Capacitors
  • Cycle-by-Cycle Over Current Protection
  • Input Under Voltage Lockout
  • Output Under Voltage Protection
  • Thermal Shutdown Protection
  • RoHS Compliant and Halogen Free
Datasheet
TitleLast UpdateDownload
3A, 18V, 1.2MHz 同步降压型 DC/DC 转换器2011/10/31
Technical Documents
TitleItem TypeLast UpdateDownload
立锜全系列产品选择指南 [Jan., 2024] Selection Guide2024/01/19
立锜精选产品 Product Tree 手册 [Aug., 2023] Selection Guide2023/08/07
Reference Design
TitleLast UpdateDownload
立锜负载瞬变测试工具2018/11/01
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT7257BHZSPPSOP-82500 Request Buy from Distributor
库存实际状况请联系代理商或业务窗口
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