DA9155M: Enabling the Fastest Charge Yet


DA9155M: Enabling the Fastest Charge Yet

By Robert Rozario


Smartphones are meant to travel with us, living in our hands and pockets without being tethered to power outlets. This is why the ability for a wireless device to charge fast – and sustain its battery life – is a major selling point for consumers today.

While manufacturers may tout larger or more agile batteries to entice buyers, this doesn’t always equate to phones spending less time plugged in. This often comes down to the type of charger used to power up the device, be that the factory-issue USB adapter that comes standard with most phones or chargers that feature fast-charging protocols like MediaTek PumpExpress™.

Generally speaking, all smartphones have built-in regulators that prevent chargers from pumping too much power into the phone. From the get-go, phones can only charge as fast as their internal regulators allow in order to prevent the battery from overheating and frying out, which puts a predetermined limit on charging speed.

Rapid chargers are more performant than standard-issue designs because despite still only being able to pump electricity into the phone’s battery at a pre-determined maximum pace, a quick charger can ensure as much power as possible is actually in the pipeline.

Think of this scenario as if the phone’s internal regulator is a bouncer at a club: The bouncer will only admit one patron every few minutes as a policy, but the club won’t ever reach capacity if there are fewer than the maximum number of patrons waiting to enter. Rapid chargers ensure that there are loads of potential patrons (electricity) angling to enter the club (a phone’s battery) right when the doors open, allowing it to quickly hit capacity. Standard chargers, however, represent a smaller volume of patrons, therefore making it take longer for the club to hit capacity.

While the benefits of rapid chargers more than justify buying products featuring them, the downside to this technology is that they can generate a lot of heat. Although rapid chargers are designed to be safe, excessive heat over the long term is not great for the health of your phone, its battery or charger, and could ultimately shorten its lifespan.

Enter DA9155M, which is our 2.5 A companion charger IC for rapid charging applications. This chip is designed to address the creation of excessive heat within the phone that comes about when an increased charge current is being delivered. The DA9155M works independent of charging standards, but is compatible with industry-leading rapid chargers, accepting input voltages from 4.3 to 13.5V, delivering up to 2.5 A output current with a ±5 percent current regulation accuracy.

This companion charger was designed so that the charge current from the power source is distributed between the main charger and the DA9155M. Picking up on the scenario above, this chip acts as a second bouncer, allowing patrons to enter the club at a faster pace now that another doorman is helping to vet.

Our IC produces very little heat thanks to its 92 percent peak efficiency and optimized thermal performance, which acts to ultimately deliver power to the battery without frying it out. Among the DA9155M’s most tactical features are selectable switching frequency, fault detection on input and output, a safety timer and junction temperature monitoring.

While smartphone technology is very much in flux, most of us still rely on wired chargers to power our devices. Our DA9155M helps keep your phones mobile longer while taking a lot of the concerns that come with rapid-charging technology out of the equation.

Learn more about this technology, which just recently began shipping in volume production, by exploring our data sheets and product briefs on its official product page.