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RT6251A/RT6251B

3A, 18V, 同步降压型转换器

RT6251A/RT6251B
New

RT6251A/B是一个高效率，单片同步降压型DC / DC转换器，在4.5V至18V的输入电源下可提供高达3A的输出电流。RT6251A/B的电流模式架构和外部补偿使得在很宽范围的负载及输出电容中，都可得到最佳的瞬态响应。逐周期电流限制保护组件不受输出短路影响，软启动功能可在启动过程中防止了输入电流过冲。故障保护包括输出欠压保护、输出过电压保护和过温保护。低电流消耗之电源关闭模式会将输出关闭，有助于电池供电系统的电源管理。

应用

  • 负载点调节
  • 笔记本电脑
  • 高密度和分布式电源系统

主要规格

RT6251A RT6251B
Status EOL EOL
Vin (min) (V) 4.5 4.5
Vin (max) (V) 18 18
Number of Outputs 1 1
Vout (min) (V) 0.8 0.8
Vout (max) (V) 15 15
Output Adj. Method Resistor Resistor
Iout (max) (A) 3 3
Current Limit (typ) (A) 6.2 6.2
Freq (typ) (kHz) 480 480
Freq (min) (kHz) 200 200
Freq (max) (kHz) 1200 1200
Ext Sync Yes Yes
Ron_HS (typ) (mOhm) 46 46
Ron_LS (typ) (mOhm) 36 36
Iq (typ) (mA) 0.8 0.6
Features 100% Duty Cycle;Adjustable Frequency;Adjustable Soft-Start;Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;External Synchronization;OCP;OTP;PSM;Power Good;Stable with Ceramic Capacitor;UVP 100% Duty Cycle;Adjustable Frequency;Adjustable Soft-Start;Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;External Synchronization;Force PWM;OCP;OTP;Power Good;Stable with Ceramic Capacitor;UVP
Package Type WQFN3.5x3.5-14A WQFN3.5x3.5-14A

关键特性

  • 低 RDS(ON) MOSFET 开关：46mΩ/36mΩ

  • 输入电压范围：4.5V至18V

  • 可调切换频率：200kHz至1.2MHz

  • 电流模式控制

  • 外部时钟同步：200kHz至1.2MHz

  • 精确的参考电压：0.8V ± 1%

  • 单调启动进入预偏置输出

  • 可调软启动

  • 电源良好指示

  • 欠压和过电压保护

  • 输入欠压锁定

Datasheet

DS6251AB-00.pdf

Videos

怎样使用简单工具对电源转换器的稳定性进行测试评估?

Datasheet

DS6251AB-00.pdf

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