TI's new buck-boost battery charger ICs - BQ25790 and BQ25792
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This post was last edited by qwqwqw2088 on 2020-7-5 16:46
Today’s “always connected” consumers want to charge their portable electronics anytime, anywhere. For example, we often see travelers charging their phones, laptops, and headphones while waiting to board a flight or riding a train. However, since each device charges differently, these consumers must carry different adapters, and remembering which adapter works with which device is a hassle (see Figure 1). For engineers to solve this hassle, their battery charging system design must support charging from a variety of input sources.
Figure 1: Example of an electric vehicle showing the need for battery monitoring for power supply
Why use USB Type-C PD charging?
Designing a single-chip charger integrated circuit (IC) to charge multiple battery-powered devices in different configurations and with different input voltage ranges is a complex process because traditional adapters are not compatible with all battery-powered devices, and traditional USB adapters are limited to 5-15 W, thus limiting the portable battery-powered devices they will support.
As shown in Figure 2, USB Type-C Power Delivery (USB PD) provides a useful alternative for fast and efficient charging for a variety of applications. The output voltage range of USB PD can be adjusted for battery-powered devices with different battery configurations to take advantage of the 5 W to 100 W (20 V/5 A) power spectrum of USB PD.
Figure 2: USB PD enables universal fast charging
Further to the example above of a traveler charging one or more devices, given that they may not always be connected to a power source, ideally their device would be able to charge quickly and once fully charged, the battery would last for a long time. Even if they only have a short stop of 15 minutes to charge their device, this would be enough to last for several hours.
Therefore, to meet consumer expectations, design engineers are looking for solutions that have the following features:
It simplifies design while enabling universal charging – capable of charging multiple battery-powered devices with different configurations (1 to 4 series cells) and different input voltages.
It can extend battery life and use the maximum battery capacity to provide consumers with a better experience.
Enables efficient charging while reducing heat dissipation to minimize power losses within the charger IC.
Capable of protecting the input adapter, battery and system from cascading failures.
TI’s new buck-boost battery charger ICs, including the BQ25790 and BQ25792, take advantage of the increased flexibility of USB PD inputs to charge 1S-4S batteries over an input voltage range of 3.6 V to 24 V. These buck-boost chargers give you the freedom to choose whether a single charger IC is a better design choice for compact, small-form-factor battery-powered devices such as mobile phones, laptops, Bluetooth headsets or medical devices, rather than designing multiple power stages that need to be stepped up or down to keep the application within a safe operating voltage range.
The BQ25790 and BQ25792 utilize a low-power charger IC to extend battery run time and conserve battery power as much as possible when the application is not in use. In addition to low power consumption, the charger also features a charge timer that allows additional charging on top of the normal charge cycle, ensuring that the battery can be charged to its maximum capacity (see Table 1).
Table 1: Programmable functions included on the BQ25790 and BQ25792
For power designs that require long run times, fast and efficient charging, and compact designs, USB PD charging offers the flexibility to charge a wide range of applications while keeping the bill of materials low and reducing the overall solution size. To learn more about designing with power density and low quiescent current in mind, check out the additional resources below.
bq25792数据手册.pdf
(1.38 MB, downloads: 34)
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