描述 Description

The RAA211630 is a DC/DC synchronous step-down (Buck) regulator that supports a 4.5V to 60V input voltage range and adjustable output voltage. It can deliver up to 3A of continuous output current with premium load and line regulation performance.

The RAA211630 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 and DEM 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 RAA211630 provides useful functions such as internal or programmable soft-start and power good indicator. For safe operation, the RAA211630 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 60V
? 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
? 95μA typical quiescent current
? Internal compensation, fixed 0.5ms SS for QFN and adjustable SS for HTSSOP
? PFM operation and DEM 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