Abstract: Li-ion batteries pack the most power per unit volume, but excessive charging or discharging can damage or destroy the battery and its surroundings. Carefully designed circuits can help you avoid such dire consequences. ...

The need for ultra-low on-resistance and low switching losses can make notebook MOSFET choice difficult. Nonetheless, MOSFET characteristics dominate DC-DC power conversion efficiency. This is critical for notebook CPUs due out in 1999....

Synchronous rectifiers can improve switching-power-supply efficiency, particularly in low-voltage low-power applications. This article compares synchronous rectifiers to Schottky-diode types and illustrates some circuit tricks useful in th...

Fast-moving battery technology poses a question for designers: whether to choose the latest technology for maximum performance or to sacrifice performance for a mature and more reliable technology. The advent of chemistry-independent batte...

Battery reversal can be fatal to portable equipment. However, numerous circuits can protect against the backward installation of batteries and other overcurrent-causing conditions. Battery-operated equipment is prone to the consequ...

Abstract: This article describes the design of a flyback power converter to operate CCD equipment such as digital cameras from four AAA cells. The MAX752 and a multiple output transformer deliver +15V, -7.5V and 5V. First pass design had l...

Power supplies are perhaps the most crucial elements of a battery-powered system. Knowledge of some basic regulator topologies will help you select or design the right supply configurations for your needs.Portable computers and dig...

Power saving is the common denominator for lower supply voltage and portable electronic systems. The paramount need in battery-powered and portable electronics—saving power—is also the major benefit in moving from 5V to 3.3V (and lower...

New-generation ICs have combined with passive-component improvements to make charge-pump voltage conversion a favored approach in many applications. In many cases, the earlier charge pumps were considered either unsuitable or acceptable on...

Abstract: Step-down buck regulators are extremely popular in a variety of portable and non-portable equipment. These buck converters are terminated with an input capacitor, CIN and an output capacitor, CO, at the output. CIN provides high-...

Abstract: The charge-pump voltage converter is known mostly in its doubler and inverter configuration. This article focuses on the voltage-splitter charge-pump configuration, which divides the input voltage precisely by two. ...

Many portable universal serial bus (USB) devices are powered from the USB port. Most of these devices need a power fail warning to perform an orderly shut down in case of USB power loss. Referred to as a "dying gasp," the warning time is t...

With most regulators, it is difficult to generate an output voltage that is less than the reference voltage. This note describes a way to use the MAX1864 to achieve an output voltage less than its 1.236V reference.The MAX1864 inclu...

Digital camera supplies must be small and efficient. The power supplies must be relatively free of low-power noise, so that post filtering can be easily achieved. They must be capable of generating several voltages. Most camera makers requ...

Figure 1 shows a simplified buck converter with asynchronous rectification based on the MAX1744/5 controller IC. Due to the turn-off nature of the diode, turn-on switching loss of the main switch (Q1) depends on the switching frequency, th...

Abstract: Design idea outlining a method to use an analog switch and discrete components to reduce the power dissipated in relay actuation. Relays are often used as electrically controlled switches. Unlike transistors, th...

The MAX1864 power-supply controller is designed for cost-effective applications such as cable modem consumer premise equipment (CPE), XDSL CPE and set-top boxes. It includes a current mode synchronized step-down controller and two positive...

Abstract: This application note provides the reader with information concerning how to interface the Maxim DS2760 Battery Monitor and Protector IC to a microcontroller. The DS5000 microcontroller module is used for example purposes. Both h...

摘要：精確的電池電量計量應(yīng)建立在對在不同工作環(huán)境和條件下的電池各種特性的充分了解的基礎(chǔ)上。要獲取這些信息，應(yīng)該在已知的條件下準(zhǔn)確測試電池的各種特性。本應(yīng)用筆記...

摘要：電壓基準(zhǔn)源簡單、穩(wěn)定的基準(zhǔn)電壓，作為電路設(shè)計的一個關(guān)鍵因素，電壓基準(zhǔn)源的選擇需要考慮多方面的問題并作出折衷。本文討論了不同類型的電壓基準(zhǔn)源以及它們的關(guān)鍵...