1124 results found, displaying items 401 - 420

The LTC4062 standalone linear single one-cell lithium-ion (Li-ion) battery charger integrates a micropower comparator and provides features for charging safety, increased charge termination flexibility, improved status reporting, and prolonged battery life. The device requires no external sense resistor, MOSFET, or blocking diode. It can charge Li-Ion batteries to a 4.2-V float voltage with ±0.35% accuracy. For USB-powered charging, the logic pin from a USB controller can select...

The Typhoon family's 300-W eighth-brick intermediate bus converter generates an isolated, unregulated 12-V/25-A output with 96% full-load efficiency. That 300 W represents 23% more useable output than the family's previous most powerful eighth-brick, raising the power density bar to 362 W/in3. Two other eighth-brick IBC converters with semi-regulated outputs in the Typhoon family have input voltage ranges optimized for telecom and computing applications. One outputs up to 300...

The MAX8620Y micro power-management integrated circuit (microPMIC) integrates a 500-mA step-down dc-dc converter, two 300-mA low-dropout linear regulators, and a 30-ms reset into a 9-mm2 TDFN package with a maximum height of 0.8 mm. The tiny package saves space compared to the 41 mm2 required by alternative designs. The device's 4-MHz synchronous step-down dc-dc converter uses a low-profile, 1-µH inductor and tiny ceramic capacitors and provides up to 92%...

Hi Bob: I see more and more uses of LEDs in place of incandescent lamps every day. However, many of our engineering brethren are not looking at the big picture with these. It would appear that they are not considering the devastating interference that some of these replacement LED (power-supply) units are creating on the AM radio broadcast bands. For example: traffic signals. While I was waiting under a red traffic signal, I had a barrage of repetitive static wiping out...

"Smaller, faster, cheaper" has been the traditional IC market refrain. But recently, the tune has changed. Today's chips are adequately small and fast for many electronic systems, even though they may never be cheap enough for purchasing managers or consumers. Yet as a direct and indirect factor impacting system cost, performance, and usability, power consumption has emerged as one of the major challenges surrounding the design and use of core...

What is a two-phase gate driver IC? A two-phase gate driver IC is a power amplifier that produces two high-current gate drives for either a synchronous buck or half-bridge totem-pole MOSFET configuration. The two-phase driver provides the gate drive for both a low-side and high-side n-channel MOSFET. In contrast, the single-phase gate driver services only a single lowside MOSFET. What is the function of the level shifter? The level shifter...

The CoolMOS CS—eight years in the making. Back in 1997, Infineon (then Siemens) introduced a technology for manufacturing power MOSFETs with 190-mΩ conduction losses in TO220 packaging. Then in 2000, the company improved the process and cut on-resistance (RDS(ON)) down to 190 mΩ while increasing switching speeds. To reduce on-state resistance, CoolMOS implements a compensation structure in the MOSFET's vertical drift region. Essentially,...

Thanks to a novel layout, the 6548 Power-over-Ethernet (PoE) midspan can accommodate 48 ports in a 1U high, 19-in. rack assembly. That represents twice the density of any other midspan (see the figure). Developed by PowerDsine, the 6548 lets companies add PoE for Voice over Internet Protocol (VoIP) to their existing Ethernet networks in half the space. It fully complies with the IEEE 802.3 standard. Web browsing and...

Imagine designing a converter/charger with an integrated power FET for lithium-ion or lithium-polymer cells in Bluetooth headsets and accessories. Then, try making it work from either an ac adapter or USB cable without user intervention. Next, have it multitask by regulating the battery voltage when there's no external supply. And, squeeze it into a 3.5- by 4.5-mm QFN package. Then again, you can try Texas Instruments' bq2501x family. Two versions have fixed 3.3- or 1.8-V...

Next-generation automotive and power applications will benefit from a fully qualified family of high-reliability small-outline IC (SOIC) packages. The narrow-body packages provide zero delamination after MSL 1, 260°C pre-conditioning testing, which significantly improves the overall reliability of the end product. They also save packaging and shipping costs. The fully qualified SOIC packages are available now. Pricing is approximately $0.005 to $0.008 per lead, depending on volume...

Power management is fast becoming one of the most critical design constraints in the world of IC designers. New 90-nm processes deliver greater silicon performance and integration, but battery technology hasn't kept up. To compensate, new design techniques are being developed to address the need for low-power silicon. A collaboration between members of the Silicon Design Chain (Applied Materials, ARM, Cadence, and TSMC) has resulted in a demonstration of the ARM1136JF-S...

Power-supply designers tend to use discontinuous current mode (DCM) for power-factor correction (PFC) for power levels below 200 to 250 W. For higher power levels, they use continuous conduction mode (CCM). Although DCM is simpler to implement, the required electromagnetic-interference (EMI) filtering and other parts make it bulkier than CCM at the higher power levels. The IR1150 PFC controller from International Rectifier lets designers use CCM from the 75-W level...

IT administrators and system intrgators and installers can use Power Dsine's Power over Ethernet (PoE) Tester to find out if these jacks are hot. PoE Testers connected to an RJ-45 outlet check for the presence of electrical power. They also identify whether the power-sourcing equipment (PSE) is an endspan or PoE midspan device. And, the PoE Tester can detect operating electrical power originated by Cisco pre-803.3af standard in-line power switches. Available from PowerDsine's...

Featuring 256 bytes of RAM, the 16-bit MSP430F42x0 series microcontrollers (MCUs) from Texas Instruments typically draw 1.1 uA in real-time clock standby mode and 300 uA in active mode. Flash programming of the 32-kbyte memory only requires 2.5 V, making it ideal for battery operation in devices like altimeters and portable instrumentation. The chip incorporates an LCD interface and charge pump to minimize the system's bill of materials. Other peripherals include a five-channel, 15-bit...

One sign that AdvancedTCA, the telecom industry's open standard for equipment manufacturers, is gaining traction is the announcement of the first power-input module for AdvancedTCA boards. The PIM200 modules incorporate all of the power-management features required by the AdvancedTCA PICMG 3.0 specification. They're rated for 200 W of maximum output power and an input voltage range of ­38 to ­75 V dc, suitable for both ­48- and ­60-V dc distribution. They also provide a...

The PH220 series of 200-W high-voltage power supplies comes housed in a standard 3U-high rack-mount chassis or bench units. These devices exhibit very low noise and high-precision output characteristics, needed for MRI scanners and other systems with multiple photomultiplier tube (PMT) devices. The first released model in the series is rated for an output voltage of ­1500 V dc, with a broad range of output voltages from 100 V to higher than 5000 V possible. Either positive or negative...

In lieu of LDOs for space-limited applications that also require design simplicity, a pair of 1.5-A synchronous buck regulators with integrated MOSFETs can shrink board-space requirements by up to 40% compared to designs that use either linear or nonsynchronous regulators. Housed in lead-free, six-terminal 3- by 3-mm MLPs, the FAN2011 and FAN2012 operate at 1.3 MHz and provide up to 95% efficiency. Output is adjustable from 0.8 V to VIN. The FAN2011 is always "on," while the...

Relatively low-power communications products such as gateway routers, firewalls, or VPN concentrators for IP telephony can now have their own uninterruptible power supply (UPS). The Liebert GXT2-500 500-V A UPS extends the company's GXT family of Online UPSs to support critical systems with modest power requirements. Other members of the family provide protection up to 10,000 V A. Online, or double-conversion systems, convert incoming ac power to dc and then back to ac within the UPS,...

For backlighting, the IPS401 LED controller will drive hundreds of white LED diodes, typically 120 to 1000 from ac sources and 10 to several hundreds from dc sources. It operates from 12 to 265 V dc as a boost-converter that controls output current rather than voltage. Constant current ensures controlled brightness and consistent spectral output from the LEDs. Brightness intensity may be adjusted by analog voltage or by pulse-width modulation (PWM) control. The IPS401 achieves better than...

The converters in the NPX20 series are available in three industry-standard pin patterns for upgrading existing designs to higher currents and lower voltages. These single-output, isolated converters deliver 6 A at voltages down to 1.8 V. The series comprises nominal 24- and 48-V input devices. Output voltage options are 1.8, 2.5 and 3.3 V in both cases. The rated output current of 6.0 A results in output powers ranging from 10.8 to 19.8 W. Surface-mount parts have dimensions of 51.2 by 25.7...

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