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The RT8208E/F is a constant-on-time PWM controller which provides four resistor programmable DC output voltages by controlling the G0 and G1 digital input. The output voltage is programmable from 0.75V to 3.3V. The RT8208E/F offers the lowest total solution cost in systems where need output voltage slewing. The RT8208E/F provides an automatic masking power good output during output voltage transition.
The constant-on-time PWM control scheme handles wide input/output ratios with ease and provides 100ns "instant-on" response to load transient while maintaining a relatively constant frequency. It provides the high efficiency, excellent transient response, and DC output accuracy needed for stepping down high voltage batteries to generate low voltage CPU core, graphics, I/O and chipset RAM supplies in notebook computers.
The RT8208E/F achieves high efficiency at a reduced cost by eliminating the current sense resistor in traditional current mode PWMs. Efficiency is further enhanced by its ability to drive very large synchronous rectifier MOSFETs. The buck conversion allows this device to directly step down from high voltage batteries for the highest possible efficiency. Additional features include soft-start, under voltage protection, programmable over current protection and non-overlapping gate drive. The RT8208E/F is available in a WQFN-16L 3x3 package.
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  • 极高的效率
  • 0.75V~3.3V 电阻可编程的输出电压，集成变换支持能力
  • 100ns 负载阶跃快速响应能力
  • 全输入、负载范围内 1% VFB 精度
  • 4.5V~26V 输入电压范围
  • 电阻可设定工作频率
  • 集成自举开关
  • 电阻可设定正电流限制阈值，电流经下桥 RDS(ON) 进行检测
  • 负电流限制器
  • 电压瞬态过冲消除器
  • 过压保护
  • 欠压保护
  • 4级电流限制软启动过程
  • Power Good 指示
  • 符合 RoHS 规范，不含卤素
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笔记本电脑 系统电源 I/O 电源 输出可编程电源
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