Buck-boost DCDC TPS63810 application in TWS earphones

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Buck-boost DCDC TPS63810 application in TWS earphones [Copy link]

By Haiwen Huang

With the explosive growth of TWS headsets in recent years, more and more end customers have put forward higher requirements on the size, battery life, sound quality, etc. of TWS headsets.

Below we recommend TI's latest solution from the perspective of battery life. Figure 1 is a typical TWS headset power supply block diagram, using a boost chip TPS61099 with an Iq (quiescent current) as low as 600nA to increase the battery voltage to 5V and power both earphone ends. There is a voltage difference between the battery voltages at the earphone ends, which will reduce the charging efficiency.

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Figure 1

TI innovatively uses two buck-boost chips TPS63810 to power the two earphone ends respectively, which improves the overall efficiency while reducing the temperature of the earphones and earphone compartment, improving the user experience. We introduce the TPS63810 solution from the following aspects:

1. TPS63810 chip introduction

a. TPS63810 is a 2.5A buck/boost converter with four built-in MOSFETs and IC interface

b. The input voltage range is 2.2V to 5.5V, which can well cover the voltage of a single lithium battery.

c. The output voltage range is 1.8V to 5.2V, and the output voltage can be configured by IC during both operation and shutdown.

d. DSBGA 2.3mm × 1.4mm small package, only 4 parts are configured on the periphery, as shown in Figure 2.

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Figure 2

2. TPS63810 buck-boost solution system block diagram introduction

a. The following is a block diagram of the TWS headset power system using TPS63810

b. The charging case uses two TPS63810s to power the two earphone terminals respectively.

c. The MCU adjusts the output of TPS63810 by reading the voltage at the headphone end.

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Figure 3

3. Figure 4 is a comparison table between the TPS63810 solution and the traditional solution, which shows great improvements in charging efficiency, overall temperature and battery life.

Function	TPS63810	Boost	Boost+LDO	Boost+Buck
Charging efficiency	92%-93%	70%-72%	70%-72%	82%-85%
Headphone compartment temperature	Low	Low	Normal	Low
Headphone temperature	Low	High	Low	Low
Headphone compartment battery life	Best	Normal	Normal	Better

Figure 4

4. Figure 5 shows that when the power levels of the two earphones are different, the two TPS63810s can charge the earphone batteries with different power levels respectively, thus ensuring that the charging voltage and the battery voltage have the minimum voltage difference under any circumstances, thereby improving the charging efficiency.

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Figure 5