Richtek RT6251B

Description

The RT6251A/B is a high efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 3A output current from a 4.5V to 18V input supply. The RT6251A/B current-mode architecture with external compensation allows the transient response to be optimized over a wide range of loads and output capacitors. Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. Fault condition protections include output under-voltage protection, output over-voltage protection, and over-temperature protection. The low current shutdown mode provides output disconnection, enabling easy power management in battery-powered systems.

Features

• Low RDS(ON) Power MOSFET Switches 46m/36m
• Input Voltage Range : 4.5V to 18V
• Adjustable Switching Frequency : 200kHz to 1.2MHz
• Current-Mode Control
• Synchronous to External Clock : 200kHz to 1.2MHz
• Accurate Voltage Reference 0.8V ±1%
• Monotonic Start-Up into Pre-biased Outputs
• Adjustable Soft-Start
• Power Good Indicator
• Under-Voltage and Over-Voltage Protection
• Input Under-Voltage Lockout

Typical applications

• High Performance Point of Load Regulation / High Density and Distributed Power Systems
• Notebook Computers

More information

• Datasheet
• IC product information