RAA211835中文资料Integrated FET 75V, 3A Asynchronous Buck Regulator with Internal Compensation and Programmable Frequency数据手册Renesas规格书

描述 Description

The RAA211835 is a DC/DC asynchronous step-down (Buck) regulator that supports a 4.5V to 75V input voltage range and adjustable output voltage. It can deliver up to continuous 3A of continuous output current with premium load and line regulation performance.

The RAA211835 uses peak-current mode control architecture. Its PWM switching frequency is programmable to provide the best trade-off between transient response and efficiency. It also supports PFM operation to maximize light load efficiency, in addition to an external bias LDO input to further reduce power dissipation across the load range. The regulator also has an internal loop compensation circuit to reduce the external component count and BOM cost.

The RAA211835 provides useful functions such as internal or programmable soft-start and power good indicator. For safe operation, the RAA211835 also offers protection features such as cycle-by-cycle peak and valley current limit, input voltage UVLO, output voltage undervoltage (short-circuit) protection, and thermal shutdown.

特性 Features

• Wide Vin operating range from 4.5V to 75V
• Adjustable Vout from 0.8V to ~90% of Vin
• Up to 3A of continuous output current
• Default 400kHz or adjustable switching frequency from 200kHz to 800kHz
• ±1% load regulation accuracy from -40°C to 125°C, ±0.5% load regulation accuracy at 25°C
• 90μA typical quiescent current
• Internal compensation, fixed 0.5ms SS for QFN and adjustable SS for HTSSOP
• PFM operation at light load with integrated external bias LDO & Power Good indicator
• Cycle-by-cycle peak and valley current limit, input voltage UVLO, output voltage undervoltage (short-circuit) protection and thermal shut down

应用 Application

应用
• Up to 75V distributed power supplies & general purposes POL
• Telecommunication base station power supplies
• Power tools
• Surveillance
• Portable mobility/robotic devices
• Industrial power systems