IR3899AMTRPBF

The IR3899A is an easy-to-use, fully integrated DC-DC buck regulator. The on-board PWM controller and integrated bootstrap diode MOSFET make the IR3899A a small-footprint solution capable of delivering efficient power conversion. In addition, it employs a fast constant on-time (COT) control scheme that simplifies design effort and provides fast transient response. The IR3899A features an internal LDO that enables single-supply operation. It is a versatile regulator offering a programmable switching frequency from 600 kHz to 2 MHz, two selectable current limit settings, forced continuous conduction mode (FCCM), and diode emulation mode (DEM) operation. It also incorporates essential protection features such as pre-bias startup, thermally compensated current limiting, overvoltage and undervoltage protection, and thermal shutdown to ensure the required system-level safety under fault conditions.

Applications

• Server applications
• Storage applications
• Telecom and datacom applications
• Distributed point-of-load power architecture

Key features

• Single 4.3 V to 17 V application
• Precision reference voltage (0.6 V ±0.5%)
• Enhanced fast COT engine, stable with ceramic output capacitors, no external compensation required
• Selectable forced continuous conduction mode or diode emulation for improved light-load efficiency
• Programmable switching frequency from 600 kHz to 2 MHz
• Enable input with voltage monitoring and power-good output
• Monotonic startup with 2 ms soft-start and enhanced pre-bias startup
• Thermally compensated internal overcurrent protection with two selectable settings
• Thermal shutdown
• Operating junction temperature: -40°C < Tj < 125°C
• Small form factor: 4 mm x 5 mm PQFN
• Halogen-free and RoHS compliant