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