48V Buck Converter Helps MHEVs Meet Fuel Emission Standards
Ever-tightening automotive fuel emission standards are becoming challenging. The gasoline engine needs the help of an electric motor to meet these standards, leading to the introduction of mild hybrid electric vehicles (MHEV) with higher battery voltages. 48V hybrids are in production vehicles today and are proliferating. A 48V buck converter with integrated MOSFETs in an advanced CMOS process helps meet these standards by withstanding high-voltage load-dump transients and operating with low EMI, low duty cycles, and high efficiency.
High-Efficiency Boost Converter Extends Wearable Medical Patch Battery Life
The Internet of Things, combined with low power wireless data transmission protocols, is enabling the continuous and real-time monitoring of patient life signs by means of wearable devices. We reviewe the challenges of powering a wearable medical patch with a small disposable 160mAh zinc-air battery. A typical boost converter that regulates the battery voltage falls short of the five-day operating requirement for wearables. On the other hand, a high-efficiency, low-quiescent boost converter can meet and exceed the requirement of five-day operation.
Back to Black with Backlight Local Dimming
In this design solution, we show how a 12.3-inch automotive LCD display backlight panel housing a full-array of 256 LEDs implements local dimming for true black using only four chips. The LED driver ICs and the voltage source that powers the LED strings are connected with a feedback loop that assures proper voltage headroom to the four LED drivers’ output, minimizing overall system power dissipation.
Efficient Earbud Charging is All About Keeping a Cool Head
True wireless earbuds commonly use three (or more) pins to interface with their charging case, for data and power transfer. Extra pins need more space while also causing a reliability concern. Additionally, a fixed voltage is commonly used during earbud battery charging, an approach that can cause unwanted heating. In this design solution, we examine the shortcomings of these approaches in more detail before presenting a composite approach that uses two ICs to address these concerns.