General Description

The RT2856H is a high efficiency, monolithic synchronous

step-down DC/DC converter that can deliver up to 6A output

current from a 4.5V to 18V input supply. The RT2856H

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 startup.

Fault condition protections include output under-voltage

protection, output over-voltage protection, and overtemperature

protection. The low current shutdown mode

provides output disconnection, enabling easy power

management 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 0.8V ± 1, Over −40°C

to 85°C

 Monotonic Start-Up into Pre-biased Outputs

 Adjustable Soft-Start

 Power Good Indicator

 Under-Voltage and Over-Voltage Protection

 Input Under-Voltage Lockout

 RoHS Compliant and Halogen Free

Applications

 High Performance Point of Load Regulation

 Notebook Computers

 High Density and Distributed Power Systems