The RTKA210040DR0000BU demonstration board

(shown in Figure 2 and Figure 3) features the

RAA210040. Capable of delivering up to 4A of

continuous current, the RAA210040 is a compact,

synchronous step-down, non-isolated complete

power supply that is optimized for space-constrained

applications. The RAA210040 is based on a peak

current mode PWM control scheme that provides a

fast transient response and excellent loop stability.

The switching frequency is programmable from

500kHz to 4MHz with either the external resistor or

synchronization to an external clock through the

SYNC pin.

The RTKA210040DR0000BU demonstration board is

a 1×1 inch 4-layer FR4 board with 2oz. copper on all

layers. It is optimized to minimize the complete power

module solution size. Operating from a single 2.7V to

5.5V input power rail, the RTKA210040DR0000BU

demonstration board offers adjustable output voltages

down to 0.6V, up to 95 efficiency, and better than

1.5 accuracy over line, load, and temperature. A

dedicated enable pin and power-good flag allow for

easy system power rails sequencing.

By default, the board is set to a 1.2V output voltage

with a 1.2MHz switching frequency.

Features

▪ Wide input voltage range from 2.7V to 5.5V

▪ Adjustable output voltage down to 0.6V with ±1.5

accuracy over line, load, and temperature

▪ Up to 95 conversion efficiency

▪ 100 duty cycle

▪ Internal 1ms soft-start time

▪ Prebias output start-up

▪ External frequency synchronization up to 4MHz

▪ Dedicated enable pin and PGOOD flag

▪ UVLO, overcurrent, negative overcurrent,

overvoltage, and over-temperature protections

Specifications

The demonstration board is configured and optimized

for the following operating conditions:

▪ VIN = 2.7V to 5.5V

▪ VOUT = 1.2V

▪ IOUT-MAX = 4A

▪ fSW = 1.2MHz