Richtek RT2857B | Demoboard DS2857B-03

Description

6A, 18V, Synchronous Step-Down ConverterThe RT2857B is a high efficiency, monolithic synchronousstep-down DC/DC converter that can deliver up to 6A outputcurrent from a 4.5V to 18V input supply. The RT2857Bcurrent-mode architecture with external compensationallows the transient response to be optimized over a widerange of loads and output capacitors. Cycle-by-cyclecurrent limit provides protection against shorted outputsand soft-start eliminates input current surge during startup.Fault condition protections include output over-currentprotection, output over-voltage protection, and overtemperatureprotection. The low current shutdown modeprovides output disconnection, enabling easy powermanagement in battery-powered systems.

Features

 Low RDS(ON) Power MOSFET Switches 26mΩ/19mΩ Input Voltage Range : 4.5V to 18V Adjustable Switching Frequency : 200kHz to 1.6MHz Current-Mode Control Synchronous to External Clock : 200kHz to 1.6MHz Accurate Voltage Reference 0.6V ± 1%, Over −40°Cto 85°C Monotonic Start-Up into Pre-biased Outputs Adjustable Soft-Start Power Good Indicator Over-Current Protection Over-Temperature and Over-Voltage Protection Input Under-Voltage Lockout RoHS Compliant and Halogen Free

Typical applications

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

More information

• IC product information