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The RT5789A/B is a simple, easy-to-use, 6A synchronous step-down DC-DC converter with an input supply voltage range of 2.5V to 6V. The device build-in an accurate 0.6V (±1.5%) reference voltage and can operate in 100% duty cycle as a very low dropout voltage regulator. the RT5789A/B integrates low R<sub>DS(ON)</sub> power MOSFETs to achieve high efficiency and is available in TSOT-23-8 (FC) package and UDFN-8L 2.5x2(FC) package.<br /><br />The RT5789A/B adopts Advanced Constant On-Time (ACOT<sup>®</sup>) control architecture to provide an ultrafast transient response with few external components and to operate in nearly constant switching frequency over the line, load, and output voltage range. The RT5789A/B is designed to operate at 1.5MHz fixed frequency. While the RT5789A automatically enters power saving mode (PSM) operation at light load to maintain high efficiency. RT5789B operates in Forced PWM over the loading range, that helps meet tight voltage regulation accuracy requirements. <br /><br />The RT5789A/B senses both FETs current for a robust over-current protection. It prevents the device from the catastrophic damage in output short circuit, over current or inductor saturation. The individual enable control input and power good indicator provides flexible system power sequence control a built-in soft-start function prevents inrush current during start-up. The device also includes input under-voltage lockout, output under-voltage protection, and over-temperature protection (thermal shutdown) to provide safe and smooth operation in all operating conditions. <br /><br />The recommended junction temperature range is -40°C to 125°C and ambient temperature range is -40°C to 85°C.
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- 集成18mΩ/16mΩ功率开关的6A Buck转换器
- 输入电压范围：2.5V至6V
- 输入电压范围：0.6V至6V
- 开关工作占空比最高达100%
- 改进型固定导通时间(ACOT®) 控制架构
►超快速瞬态响应
►无需外部补偿
►针对低ESR MLCC输出电容进行了优化 - ±1.5%精准度0.6V回馈参考电压
- 35μA静态工作电流 (RT5789A)
- 强健的过流保护设计
- 可选工作模式
►节能模式 (PSM) (RT5789A)
►强制PWM模式 (RT5789B) - 1.5MHz固定工作频率
- 输出端预偏置时启动过程单调上升
- 独立使能控制
- Power Good指示
- 内建固定软启动过程 (典型值1.5ms)
- 支持100%占空比
- 内建输出放电功能
- 输入欠压锁定保护
- 打嗝模式输出欠压保护
- 过热保护
- TSOT-23-8 (FC) 和UDFN-8L 2.5x2 (FC) 封装
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WLAN设备/存储装置 手机和其他掌上型设备 机顶盒、调制解调器、xDSL设备 各种常规应用中的低压转换
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