Battery Power Circuit Design in Portable Electronics

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

inductance

Brand AVX TPSE226M035R0125 Low impedance tantalum capacitor AVX 22

Electronic scale crystal oscillator 3.2*2.5mm 3225 16M (16.000MHZ) 12PF 10PPM 20PPM 30PPM

SMD aluminum electrolytic capacitor

Overview:
Not only are portable entertainment devices and handheld products powered by batteries, but such applications are also useful in green products such as Photovoltaic (PV) applications and Electric Vehicles (EVs).

As batteries become more popular in people's daily lives, the choice of battery and low-power design has become the key to the success of battery-powered product development. Because today's semiconductor technology is developing more rapidly than battery technology, power management design is the key to making users feel the pros and cons of the product.

In addition to safety, cost and size, maximizing battery life and extending its life is extremely important for system design in battery-powered applications. As battery technology for driving portable applications continues to increase, there is a need to select a suitable method for discharging and charging rechargeable batteries. This article first reviews the general battery strategy for portable applications and then discusses power management and battery management circuit design using today's integrated solutions.

The main battery technology battery technology can be easily divided into two categories: non-rechargeable and rechargeable. A non-rechargeable battery is discarded after it has been used once, and is called a disposable battery. Alkaline batteries are the most common household disposable batteries. Alkaline rechargeable batteries are also available on the market, but are beyond the scope of this article. A typical alkaline battery has a floating voltage of approximately 1.5V to 1.65V, a nominal voltage of 1.2V, and a voltage at the end of life of approximately 0.9V. The voltage at the end of a single-cell alkaline battery life can be as low as 0.7V-0.8V , depending on the load current. Table 1 shows some common alkaline battery configurations. Some applications can be configured in a variety of configurations, depending on product form factor, system requirements, available solutions, and power budget.
For example, a wireless optical mouse solution operates from 1.8V to 3.2V. The mouse works with two alkaline batteries in series, eliminating the need for an additional regulated power supply. If an extremely compact mouse design is required, 2 AA/AAA alkaline batteries may not be available. In this case, a single AA/AAA alkaline battery can be used to reduce the space, but a boost converter is needed to raise the voltage to 1.8V.

Table 1: Comparison of alkaline battery configurations (please read the PDF for details)