Programmable DC/DC converter reduces solution size

Posted By : Nat Bowers
Programmable DC/DC converter reduces solution size

The AP3440 is a PWM synchronous buck DC/DC converter suited for low-voltage, high-density power systems. Introduced by Diodes Incorporated, the converter's switching frequency is programmable from 0.2-2MHz, enabling a reduction in the size of external inductors and capacitors and simplification of power supply design.

The buck converter’s operating frequency is set using a timing resistor and is also easily synchronised with an external system clock applied to the same resistor input pin. A supply voltage range of 2.95-5.5V makes the AP3440 well suited for both 3.3 and 5V bus systems.

Packaged in the thermally enhanced V-QFN3030-16 package and integrating a pair of very low on-resistance N-channel power MOSFETs, the converter is capable of driving a 4A load at an efficiency level as high as 94%. The AP3440 ensures excellent line and load regulation, with its current mode control providing fast transient response and cycle-by-cycle current limit.

The buck converter’s built-in protection features include over-current and over-voltage protection, thermal shutdown, and a programmable under-voltage lockout (UVLO) function. The UVLO level is internally set at 2.6V, but is easily increased by programming the threshold using a resistor divider network on the enable pin.

To help minimise inrush currents and to support power-up sequencing, the AP3440 also integrates a soft-start function, programmed via an external capacitor. The inclusion of an open-drain ‘Power Good’ output signals that the device output is within 93% and 107% of its nominal voltage and helps to further reduce circuit footprint.

The AP3440 buck converter from Diodes Incorporated is available now, priced at $0.25 (USD) each in 10,000 unit quantities.

Downloads


You must be logged in to comment

Write a comment

No comments




Sign up to view our publications

Sign up

Sign up to view our downloads

Sign up

Sensor+Test 2019
25th June 2019
Germany Nürnberg Messe
DSEI 2019
10th September 2019
United Kingdom EXCEL, London
European Microwave Week 2019
29th September 2019
France Porte De Versailles Paris
Engineering Design Show 2019
16th October 2019
United Kingdom Ricoh Arena, Coventry
ELIV 2019
16th October 2019
Germany Bonn World Conference Center