General Description

The RT2825 features two synchronous wide input range

high efficiency buck converters that cab deliver up to 5A/

5A output current from a 4.5V to 18V input supply. The

converters are designed to simplify its application while

giving the designer the option to optimize their usage

according to the target application.

The converters can operate in 5V, 9V, 12V or 15V systems

and have integrated power transistors. The RT2825's

current mode architecture allows the transient response

to be improved. Cycle-by-cycle current limit provides

protection against shorted outputs.

Each converter features enable pin that allows a delayed

start-up for sequencing purposes, soft start pin that allows

adjustable soft-start time by choosing the soft-start

capacitor, and a current limit (RLIMx) pin that enables

designer to adjust current limit by selecting an external

resistor and optimize the choice of inductor. The COMP

pin allows optimizing transient versus dc accuracy

response with a simple RC compensation.

The switching frequency of the converters can either be

set with an external resistor connected to ROSC pin or

can be synchronized to an external clock if needed. The

switching regulators are designed to operate from

200kHz to 1MHz. The converters operate with 180° phase

between two channels to minimize the input filter

requirements.

The RT2825 also features a low power mode enabled by

an external signal, which allows for a reduction on the

input power supplied to the system when the host

processor is in stand-by (low activity) mode.

The RT2825 is available in a VQFN-36L 6x6 package.

Features

Wide Input Supply Voltage Range : 4.5V to 18V

Fully Integrated Dual-Buck, Up to 5A/5A

Adjustable Switching Frequency 200kHz to 1MHz

Set by External Resistor or SYNC Signal

Dedicated Enable/Soft-Start for Each Buck

Current Mode Control with Simple Compensation

Circuit

Adjustable Cycle-by-Cycle Current Limit Set by

External Resistor

Over-Temperature Protection

Power Good Indicator

Discontinuous Operating Mode at Light Load when

LOWP = L

1 VREF Accuracy

RoHS Compliant and Halogen Free

Applications

DTV

TCON

BDVD

Set Top Boxes

Tablet