The RT8800/B is Richtek's multi-phase synchronous buck controller dedicated to high-density power supply regulation. The device can implement 2, 3 buck switching stages, which operate in interleaved phase set automatically. The output voltage is regulated and controlled following the input voltage of FB pin. Such a single analog control provides a simple, flexible, wide-range and extreme cost-effective high-density voltage regulation solutions for various high-density power supply application. The RT8800/B multi-phase architecture provides high output current while maintaining low power dissipation on power devices and low stress on input and output capacitors. The high equivalent operating frequency also reduces the component dimension and the output voltage ripple in load transient. RT8800/B implement both voltage and current loops to achieve good regulation, response and power stage thermal balance. The RT8800/B apply the time sharing DCR current sensing technology newly as well; with such a topology, the RT8800/B extract the DCR of output inductor as sense component to deliver a more precise load line regulation and better thermal balance capability. Moreover, the parts monitor the output voltage for over-current and over-voltage protection; Soft-start and programmable under-voltage lockout are also provided to ensure safe and reliable operation.
The RT8800/B is a general purpose multi-phase synchronous buck controller designed for high density power supply regulation. It implements 2 or 3 buck switching stages operating in interleaved phase, automatically selected based on the specific part variant (RT8800 supports 2/3 phases, RT8800B supports 2 phases). The device provides precise core voltage regulation and ensures power stage thermal balance.
| Operating Temperature Range | 0 °C to 70 °C |
|---|---|
| Junction Temperature Range | 0 °C to 125 °C |
| Typical Operating Frequency (Per Phase) | 300kHz |
| Package Type | VQFN-16L 3x3 or SOP-16 |
The RT8800 supports 2 or 3 phases, while the RT8800B variant is limited to 2-phase power conversion.
The absolute maximum rating for the supply voltage (VDD) is 7V.