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...

摘要：DC-DC轉(zhuǎn)換器常用于采用電池供電的便攜式及其它高效系統(tǒng)，在對電源電壓進(jìn)行升壓、降壓或反相時，其效率高于95%。電源內(nèi)阻是限制效率的一個重要因素。本文描述了電源內(nèi)阻...

摘要：最終用戶是否滿意其便攜式設(shè)備的設(shè)計，很大程度上取決于電池的性能。 電池的關(guān)鍵指標(biāo)當(dāng)然是電池的使用壽命。從表面上看，這只是一個簡單的規(guī)格，但它卻涉及到了...

摘要：本文討論用于單電源或雙電源處理器的上電復(fù)位功能和門限電壓的選擇策略，另外，還探討了手動復(fù)位、電源失效和低電壓檢測等功能。文中闡述了避免使用分立POR和處理器...

Abstract: This article about low-voltage ICs discusses many types of low-voltage ICs, including voltage regulators, data converters, op amps and current monitors, comparators, microprocessor supervisors, voltage references, analog switches...

摘要：許多電池電流監(jiān)測應(yīng)用中需要雙向電流檢測功能，以測量電池的充電和放電電流。本文介紹了怎樣用兩個單向電流檢測放大器，比如MAX4172和MAX4173，組成一個雙向電流檢測放大...