RAA211835GSP#HA0

The RAA211835 is a DC/DC nonsynchronous 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. With a programmable PWM switching frequency, it provides the best trade off between transient response and efficiency. The device supports PFM operation to maximize light load efficiency as well as an external bias LDO input to further reduce power dissipation across the load range. The regulator 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 a power-good indicator. For safe operation, the RAA211835 has protection features such as cycle-by-cycle peak current limit, input voltage UVLO, output voltage undervoltage (short-circuit) protection, and thermal shutdown.

Applications

• Industrial power systems
• Distributed power supplies and general-purpose point-of-load
• Telecommunication base station power supplies
• High-voltage single-board systems

Key features

• Wide input voltage range: 4.5V to 75V
• Adjustable output voltage: 0.8V to 90% of VIN
• Up to 3A of continuous output current
• Default 400kHz switching frequency and programmable switching frequency range 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
• Internal 0.5ms soft-start in QFN
• External programmable soft-start (HTSSOP)
• PFM operation at light load
• Integrated external bias LDO
• Power good indicator
• Integrated MOSFET rDS(ON) (typical): 155mΩ (QFN); 200mΩ (HTSSOP)
• Cycle-by-cycle peak current limit
• Input voltage UVLO and output voltage undervoltage (short-circuit) protection
• Thermal shutdown
• Available in 20 Ld QFN 4mm × 3.5mm and 16 Ld HTSSOP packages