LTC3524 的 2.5V 至 6V 輸入電源範圍非常適合於那些從鋰離子電池或者多節堿性或鎳電池供電的便攜式設備。LCD 和 LED 驅動器的工作頻率均為 1.5MHz，因而允許使用纖巧、低成本的電感器和電容器。
上傳時間： 2013-11-22
上傳用戶：zzbbqq99n
在常用的低壓電源中，用電容器降壓（實際是電容限流）與用變壓器相比，電容降壓的電源體積小、經濟、可靠、效率高，缺點是不如變壓器變壓的電源安全。
上傳時間： 2013-12-25
上傳用戶：xhwst
移動電源方案功能要求: 1、單芯片控制充電、升壓輸出、電量指示功能，輸出電流可達1A，效率90%以上 按開關鍵開機6燈頻閃幾次后待機， LI為充電指示，L2頻閃指示有輸出。L2I常亮為輸出充滿指示，L3-L6為電量指示。在輸出時L2頻閃。充電時LI頻閃。當有負載設備連接時自動輸出，無負載電流轉為待機。 當按開關工作后，無負載（無操作）10秒自動關機。 2、移動電源方案，單芯片控制為內電池充電、升壓輸出、電量顯示、邊充邊放；輸入電壓5V、300-1000MA，輸出電壓5V、；輸出電流可達1A，輸出效率90%以上 1）、電性能參數： USB輸入電壓：DC 5V 輸出DC5V
上傳時間： 2013-11-19
上傳用戶：wangfei22
阻容降壓式電源:將交流市電轉換為低壓直流的常規方法是采用變壓器降壓后再整流濾波，當受體積和成本等因素的限制時，最簡單實用的方法就是采用電容降壓式電源。與變壓器降壓相比，電容降壓（也可理解成電容限流）的電源體積小、經濟、可靠、效率高，缺點是不如變壓器降壓的電源安全。通過電容器把交流電引入負載中，對地有220V電壓，人易觸電，但若用在不需人體接觸的電路內部電路電源中，本缺點也可克服。如冰箱電子溫控器或遙控電源的開/關等電源都是用電容器降壓而制成的。
上傳時間： 2013-11-23
上傳用戶：wxqman
The CN3052A is a complete constant-current /constant voltage linear charger for single cell Li-ion and Li Polymer rechargeable batteries. The device contains an on-chip power MOSFET and eliminates the need for the external sense resistor and blocking diode.
上傳時間： 2013-11-10
上傳用戶：子虛烏有
Linear Technology offers a variety of devices that simplifyconverting power from a USB cable, but the LTC®3455represents the highest level of functional integration yet. The LTC3455 seamlessly manages power flowbetween an AC adapter, USB cable and Li-ion battery,while complying with USB power standards, all from a4mm × 4mm QFN package. In addtion, two high efficiencysynchronous buck converters generate low voltage railswhich most USB-powered peripherals require. TheLTC3455 also provides power-on reset signals for themicroprocessor, a Hot SwapTM output for poweringmemory cards as well as an uncommitted gain blocksuitable for use as a low-battery comparator or an LDOcontroller. The PCB real estate required for the entire USBpower control circuit and two DC/DC converters is only225mm2.
上傳時間： 2013-11-02
上傳用戶：名爵少年
Although recent popular attention is focused on LithiumIon batteries, one must not forget that other batterychemistries, such as Nickel Cadmium (NiCd) and NickelMetal Hydride (NiMH) have advantages in rechargeablepower systems. Nickel-based batteries are robust, capableof high discharge rates, have good cycle life, do notrequire special protection circuitry and are less expensivethan Li-Ion. Among the two, NiMH batteries are rapidlyreplacing NiCd because of their higher capacity (40% to50% more) and the environmental concerns of the toxiccadmium contained in NiCd batteries.
上傳時間： 2013-11-04
上傳用戶：qq10538412
A number of conventional solutions have been available forthe design of a DC/DC converter where the output voltageis within the input voltage range—a common scenarioin Li-Ion battery-powered applications—but none werevery attractive until now. Conventional topologies, suchas SEPIC or boost followed by buck, have numerousdisadvantages, including low effi ciency, complex magnetics,polarity inversion and/or circuit complexity/cost. TheLTC®3785 buck-boost controller yields a simple, effi cient,low parts-count, single-converter solution that is easyto implement, thus avoiding the drawbacks associatedwith traditional solutions.
上傳時間： 2013-10-21
上傳用戶：ljt101007
The LTC®3562 quad output step-down regulator is designedfor multicore handheld microprocessor applications thatoperate from a single Li-Ion battery. Its four monolithic, higheffi ciency buck regulators support Intel’s mobile CPU P-Stateand C-State energy saving operating modes. The outputvoltages are independently controllable via I2C, and eachoutput can be independently started and shut down. Designerscan choose from power saving pulse-skipping mode orBurst Mode® operation, or select low noise LDO mode. Thespace-saving LTC3562 is available in a 3mm × 3mm QFNpackage and requires few external components.
上傳時間： 2013-10-07
上傳用戶：1583060504
Piezoelectric motors are used in digital cameras for autofocus,zooming and optical image stabilization. Theyare relatively small, lightweight and effi cient, but theyalso require a complicated driving scheme. Traditionally,this challenge has been met with the use ofseparatecircuits, including a step-up converter and an oversizedgeneric full-bridge drive IC. The resulting high componentcount and large board space are especially problematicin the design of cameras for ever shrinking cell phones.The LT®3572 solves these problems by combining astep-up regulator and a dual full-bridge driver in a 4mm× 4mm QFN package. Figure 1 shows a typical LT3572Piezo motor drive circuit. A step-up converter is usedto generate 30V from a low voltage power source suchas a Li-Ion battery or any input power source within thepart’s wide input voltage range of 2.7V to 10V. The highoutput voltage of the step-up converter, adjustable upto 40V, is available for the drivers at the VOUT pin. Thedrivers operate in a full-bridge fashion, where the OUTAand OUTB pins are the same polarity as the PWMA andPWMB pins, respectively, and the OUTA and OUTB pinsare inverted from PWMA and PWMB, respectively. Thestep-up converter and both Piezo drivers have their ownshutdown control. Figure 2 shows a typical layout
上傳時間： 2013-11-18
上傳用戶：hulee
