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The RT8243A/B/C is a dual step down, Switch Mode Power Supply (SMPS) controller which generates logic supply voltages for battery powered systems. It includes two Pulse Width Modulation (PWM) controllers adjustable from 2V to 5.5V and also two fixed 5V/3.3V linear regulators. One of the controllers (LDO5) provides automatic switch over to the BYP1 input connected to the main SMPS1 output for maximized efficiency. An optional external charge pump can be monitored through SECFB (RT8243B/C). Other features include on board power up sequencing, a power good output, internal soft-start, and a soft discharge output that prevents negative voltage during shutdown.

A constant on-time PWM control scheme operates without sense resistors and assures fast load transient response while maintaining nearly constant switching frequency. To eliminate noise in audio applications, an ultrasonic mode is included, which maintains the switching frequency above 25kHz. Moreover, a diode emulation mode maximizes efficiency for light load applications. The SMPS1/SMPS2 switching frequency can be adjustable from 200kHz/233kHz to 400kHz/466kHz respectively.

The RT8243A/B/C is available in a WQFN-20L 3x3 package, and operates over an extended temperature range from -40°C to 85°C.

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  • 输入电压范围：5.5V~25V
  • 输出电压范围：2V~5.5V
  • 无需使用电流检测电阻
  • 5V/3.3V 线性稳压器
  • 4700ppm/°C RDS(ON) 电流检测
  • 内部电流限制的软启动和输出软放电
  • 内建 OVP/UVP/OCP
  • 使能端控制的操作模式选择 (RT8243A)
  • SECFB 输入维持电荷泵电压输出 (RT8243B/C)
  • Power Good 指示 (RT8243B/C，包含 SECFB)
  • 符合 RoHS 规范，不含卤素
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笔记本电脑 系统电源 3~4节锂离子电池供电的设备
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