Power Management New Product Highlights

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Chongmao Technology launches a new PFC control chip, and PWM+MOS two-in-one IC is also under development

The newly released power factor correction (PFC) control chip series by Chongmao Technology is mainly used in LCD TV, electronic ballast, desktop computer, notebook computer and other fields, including SG6931, SG6902 and SG6961. SG6931 is a PFC/PWM combination chip suitable for forward architecture, and SG6902 is a PFC/PWM combination chip designed for flyback architecture. These two types of combination chip products highly integrate PFC and PWM components into an independent component, and are designed for current conversion operation in continuous conduction mode (CCM) of high-power power converters above 150W. Another streamlined PFC control chip SG6961 has excellent power factor and total harmonic performance, and is used for current conversion operation in critical current mode, suitable for 70~200W power conversion.

The company also revealed that it will launch two new product lines for chargers/adapters for all low-end, mid-end and high-end portable products: SGB1xx series, CC/CV±5%, for the 5W charger market; SGP3xx series, CV±10%, for replacing linear chargers below 3W. Finally, the company will integrate the above primary-side control PWM IC with MOS, and is developing PWM/MOS two-in-one ICs: EZ1xx series (SGP1xx PWM+MOS); EZ3xx series (SGP3xx PWM+MOS).

Shengbang launches 300mA low power consumption, low voltage dropout LDO

Shengbang Microelectronics (SGMC) has launched the SG2011 series of low-power, low-dropout CMOS linear regulators with an output current of 300mA, thermal overload protection, output current limit, and preset output voltage (accuracy of ±1.8%). The device is targeted at mobile phones, digital cameras, MP3, MP4, USB2.0, modems, PCs, handheld devices, electronic dictionaries, portable battery-powered devices, and other applications.

According to reports, the input voltage of the SG2011 series LDO is 2.5V~5.5V; it has a variety of output voltages: fixed output 1.5V, 1.8V, 2.5V, 2.8V, 3.0V, 3.3V and 3.6V; the voltage difference is 210mV when the output is 300mA; the power supply current is 80μA at zero load; the power supply current is 110μA when the output current is 300mA.

SG2011 is a pollution-free, lead-free and environmentally friendly product with a temperature range that extends the industrial standard from –40°C to +125°C and is available in small packages of SOT23-3, SOT89-3 and SOT89-3 (L-type).

Freescale Power Management ICs Provide Plug-and-Play for Communications Processors

Freescale has introduced its third-generation QUICCsupply power management IC to support its PowerQUICC communications processors. The MC34703 integrates system power functions in a small package, making it an all-in-one plug-and-play product for PowerQUICC III and other communications processors for telecom and networking applications.

QUICCsupply ICs manufactured using Freescale's proprietary SMARTMOS program include key features such as power sequencing, voltage limiting, system protection, programmable outputs, reset and watchdog functions. The MC34703 dual-output power IC is equipped with a 10A synchronous buck converter with integrated high-current low-Rds(on) and LDO controller that can work in conjunction with selected external MOSFETs.

The MC34703's innovative logic and power integration is said to minimize the need for external components for applications ranging from telecom and network cards to industrial controllers, reducing required motherboard space by up to 50 percent and supporting switching speeds up to 400kHz.

The technical features of MC34703 include: large input voltage range (2.8V to 13.5V), synchronous buck regulator output current up to 10A, integrated power MOSFET, LDO controller output up to 2A (suitable for I/O and bus), adjustable switching frequency (200kHz to 400kHz), selectable power sequencing, I2C voltage limit and programmable watchdog timer, adjustable conversion rate, Power-ON reset with adjustable delay timer, smooth start, suitable for two outputs. In addition, the IC has built-in low voltage, over current and over temperature protection circuits, and adopts 33-lead PQFN small package, which complies with RoHS directive.

ST's highly integrated power management chip extends battery life in portable multimedia systems

STMicroelectronics (ST) has released a small single-chip power management device, the STw4810, which can be used in multimedia application processing engines in any portable product, including ST's STn881x Nomadik processor. In addition to multiple DC/DC converters and programmable regulators, the STw4810 also integrates a complete USB-OTG module and mainstream memory card interfaces, as well as processor power monitoring and reset monitoring components.

Because of the highly integrated power management functions and basic support for multimedia products, STw4810 can minimize component costs and circuit board area, simplifying the design of printed circuit boards. The new chip integrates various analog and mixed signal functions in a very small 4.6×4.6mm VFBGA84 or 6×6mm TFBGA84 package. Only a few external components are needed to perform the main energy management functions in APE products.

The STw4810's two independent DC/DC step-down converters provide 1V to 1.5V at 600mA for the core supply and 1.8V at 600mA for I/O functions and general functions. Three low-dropout programmable regulators power auxiliary devices and peripheral interfaces.

Power Integrations' PeakSwitch family of power conversion ICs is ideal for applications such as printers

The new PeakSwitch series from Power Integrations is the first monolithic integrated circuit containing a switching converter for power supplies with a high ratio of peak to continuous power. The product contains a 700V MOSFET transistor, integrated with low-voltage control circuits and safety circuits on a single chip. PeakSwitch uses an on/off control scheme and Power Integrations' EcoSmart technology to provide high efficiency at high and low load currents.

The company says PeakSwitch is perfectly suited for any power supply where the peak power is three times higher than the average continuous power. A prominent example is a printer. When the printer is printing, it needs to start the paper feed motor, which requires increased power. After printing starts, the paper starts to move and much less power is required. A typical inkjet printer requires 30W of continuous power when printing, and up to 80W of power for a short period of time when starting the paper feed motor.

In addition, Power Integrations points out that PeakSwitch provides peak power at frequencies up to 277kHz, meeting load requirements. For continuous loads, the actual switching frequency automatically drops to lower values, below 1kHz at no load.

In the past, power supplies were "designed with a lot of margin" to meet peak power needs, just like telecommunications networks are designed with short-term peak traffic in mind. Most of the time, the "excess" capacity is not used. With PeakSwitch, the power supply can be designed for continuous power and the power supply capacity can be temporarily expanded when needed. In this way, smaller magnetic components can be used, resulting in a lower cost power supply.

Qingli Technology uses synchronous rectification technology to improve power efficiency

As electronic devices gradually move toward low voltage, high current applications, the power management market is shifting from secondary rectification using Schottky diodes to synchronous rectification using MOSFETs.

In terms of power management, QINGLI Technology has a US patented synchronous rectification technology that improves the power management performance of AC/DC. The company uses the "predictive" synchronous rectification patented technology as the core, and uses its synchronous rectification IC (SP6002, SP6003, SP6003A, SP6013) with ultra-low impedance trench MOSFET to replace the secondary Schottky diode of traditional AC/DC. This solution can avoid the heat energy and reaction time accumulated by the curved startup voltage of the Schottky diode.

The rectification effect produced by the combination of SP6002 (forward type) and SP6003 (flyback type) with Trench MOSFET is a linear voltage-activated rectification function. The response speed of the rectification switching can reduce the switching loss very quickly, and the ultra-low impedance of Trench MOSFET can reduce the conduction loss during AD/DC operation. In addition, the timing (dV/dt) waveform slope tracking function of Qingli Technology can effectively detect the AC/DC secondary noise waveform, thereby avoiding the abnormal influence of noise on power conversion.

Diansheng Landa launches the fifth generation of switching power supply products

Densei-Lambda announced the launch of the fifth generation of switching power supply products to meet the industry's demand for environmentally friendly (compliant with the EU RoHS directive), miniaturized, and efficient switching power supply products. The company launched four series of new power supply products and models, including two fifth-generation new products - the AC/DC standard switching power supply HWS series and the CC-E series DC/DC converter; the Genesys series of small and large-capacity CVCC variable power supply that achieves 1500W power in a 1U size; and the SWS series of AC/DC packaged power supply that emphasizes cost performance.

Among them, the HWS series is a high-efficiency and small product with an output capacity of 15-1500W and an output voltage of 3.3-48V. Compared with the old products, the volume is reduced by 50% while ensuring the same output power. This series has a rich lineup, with options such as packaged, non-packaged, and remote control. Applications include factory automation equipment controllers, semiconductor manufacturing/inspection equipment, medical equipment, power equipment, and various display devices. The CC-E series is a small, lightweight, RoHS-compliant DC/DC converter product that does not use tantalum capacitors and electrolytic capacitors. The entire series has built-in remote control functions that correspond to DIP and SMD assembly methods, and high output voltage accuracy (±3%).

IR smart rectifier IC helps reduce MOSFET temperature by 10 degrees

The IR1167 smart rectifier IC from International Rectifier (IR) is suitable for AC/DC power converter applications in notebook computers, mini PCs, LCD and plasma TVs, game consoles and other digital computing and home entertainment systems. The device not only simplifies the design, but also improves the secondary synchronous rectification (SR) efficiency in high-power flyback and resonant half-bridge conversion circuits, making the design smaller and heat dissipating better.

In 100-300W flyback circuits, traditional transformer control circuits are complex, bulky, and waste energy because the polarity reversal sensing of the SR MOSFET requires high reverse current. In contrast, IR smart rectifier ICs achieve fast and accurate control to minimize power consumption by leveraging new technical standards and directly sensing the voltage threshold of the SR MOSFET. The IR1167 can improve overall system efficiency by 1%, reduce MOSFET temperature rise by up to 10 degrees, and reduce the number of circuit components to 1/4 of the past.

The IR1167 uses IR's proprietary HVIC technology, which is compatible with a variety of MOSFET gates and can also be directly connected to IR's various 30-200V SR MOSFETs. The advantages of the IR1167 smart rectifier IC will be more prominent when used with IR MOSFET products with optimized on-resistance and gate charge characteristics, such as: IRF7853, IRFB4110 and IRFB4227. These optimized MOSFETs can be integrated with the IR1167 smart rectifier IC to become a "total chipset solution" to further improve the efficiency and power density of the SR circuit.

Since the IR1167 can operate independently of the main control, it is suitable for a variety of switch mode transformer and capacitor output filter applications. Being independent of the primary section means that the IR1167 operates in a low power "frequency hopping mode", making the product meet the "standby power less than 1W" and California Energy Commission's 80Plus regulations.

Tyco DC/DC converters have an efficiency of 96% at 9.6V

Tyco Electronics' EUK240 series DC/DC converters have an output power of 240W and are packaged in a 1/8 brick package. The product supports intermediate bus architecture applications with a 5:1 fixed ratio output. The EUK240 power module is an isolated DC/DC converter with an input voltage range of 36-60Vdc and a single fixed ratio output voltage. The device has a maximum output current of 34A and can output 240W of power over the entire input range. The module is fully isolated between the input and output, allowing multi-polarity configurations and ground connections, and its built-in filter reduces the number of peripheral components.

EUK240 can output 240W power within the input voltage range of 55℃ and 1m/s, and the efficiency is 96% at 9.6V, which is a solution for IBA applications using load point converters. In addition, the module also has functions such as remote on/off logic, low output ripple noise, overheat protection, output overcurrent/overvoltage protection, and output voltage regulation. After fault shutdown, it can enter the automatic restart protection mode and basic isolation state.

Onbao Electronics PWM control chip is used for DC/DC switching power supply

Onbao Electronics has launched the highly integrated and high-function PWM control chip OB2268/2269. This chip is used in DC/DC switching power supplies and adopts DIP8 and SOP8 packaging. It contains many patented technologies of Onbao, making it easier for system design to meet the specific requirements recommended by the International Energy Agency (IEA), Energy Star and Blue Angel in 2007.

The OB2268/2269 series products adopt BiCMOS technology, with low startup current (5uA), low operating current (＜3mA＝) and various green environmental protection requirements, and can provide certified Onbao Electronics SGS report. Its main features are concentrated in: 1. High integration can minimize external parts and reduce the complexity of power supply design, thereby shortening product development time; 2. No-load and light-load both meet the specific requirements recommended by the International Energy Agency, Energy Star and Blue Angel in 2007; 3. Ultra-low noise; 4. Built-in leading edge blanking circuit; 5. Overvoltage and over-temperature protection functions; 6. Undervoltage protection function (UVLO); 7. Output overload protection function (OLP); 8. OCP compensation module is set, with excellent OCP characteristics; 9. B2269 has frequency jitter function to improve the EMI characteristics of the system. This product can be used in various switching power supplies, high-power power converters (30-150w) and some other high-end applications, including LCD monitors, LCD TV power supply, DVD power supply, N/B adapter, PC/TV/set-top box power supply, charger, communication power supply, etc.

National Semiconductor Launches Synchronous Buck Controller with 1% Voltage Feedback Accuracy

National Semiconductor Corporation announced that the company's LM274x series of synchronous buck controllers have added four new models, including the LM2747 voltage mode PWM synchronous buck controller that can maintain 1% voltage feedback accuracy over a wide industrial temperature range. These four new controllers can provide regulated power supply for cores such as ASICs, DSPs and FPGAs with extremely high accuracy. In addition, these controller chips can also support high-frequency operation, which helps to reduce the size of the power system.

The LM2747 chip is suitable for a wide industrial temperature range of -40℃ to +125℃, and guarantees that the voltage feedback accuracy within this range can reach 1%, which is especially important for cores with an operating voltage below 1V. In addition, the shortest on-time of this chip is only 40ns, so when operating at a 1MHz switching frequency, it can provide a 0.6V output using a 12V supply voltage. Other functions of the LM2747 chip include pre-biased load startup, soft start with tracking function, high-precision enable function to ensure sequential power supply, and external clock synchronization function, the latter of which is used to prevent the external clock from easily interacting with other power supply systems and circuits with extremely sensitive loads.

The LM2746 controller has essentially the same features and benefits as the LM2747, but the LM2746 does not have pre-biased load startup or external clock synchronization. The LM2745 controller has essentially the same features and benefits as the LM2747, but the LM2745 has a voltage feedback accuracy of 1.5% over the same wide temperature range. The LM2748 controller has the same accuracy as the LM2745, but the LM2748 does not have an external clock synchronization feature.

New Zetex current monitor accurately measures current in harsh environments

Zetex's new ZXCT1011 current monitor can accurately measure DC current in the range of -40℃-125℃. It is reported that this new integrated circuit is specially designed for sensing high-side current to avoid any damage to the ground plane.

The 5-pin ZXCT1011 device is easy to use and requires few external components. It measures the voltage across a low-value sense resistor and converts it to a proportional output current through an external shunt resistor. This current is then positioned by an output resistor to produce a ground-referenced output voltage with 1% accuracy.

With a maximum sensing voltage of 500mV and a bandwidth of 1.5MHz, the ZXCT1011 current monitor can provide real-time and accurate power or load current monitoring over a wide range of load currents, from a few microamperes to hundreds of amperes. The device operates with an input voltage of 2.5V to 20V and is tolerant to circuit transients, thus meeting a variety of demanding applications such as automotive, telecommunications, and industrial control.

The ZXCT1011 is packaged in a tiny SOT23-5 package with a typical operating current of 4μA, making it suitable for the design of battery-powered portable devices.

Maxim Power IC can provide multiple power supplies for LCD panels

Maxim's MAX8728 power supply IC can provide multiple power supplies for TFT LCD panels in TVs and monitors. The chip includes buck and boost regulators, positive and negative charge pumps, and a dual-mode logic-controlled high-voltage switch control module.

The MAX8728 provides 3.3V logic, 13.5V source drive, 28V positive gate drive, and -6V negative gate supply, and is optimized for 12V powered LCD TV panels and LCD monitors. The MAX8728's boost and buck regulators have internal power MOSFETs and operate in high-frequency mode, allowing the use of small inductors and capacitors. Both switching regulators use a fixed-frequency current-mode control architecture for fast load transient response and easy compensation.

The product's positive and negative charge pump regulators can be adjusted via external resistive dividers. Its switch control module can be used to control the positive TFT gate drive voltage. Its soft-start function can limit the inrush current at startup, and the integrated current limiting function element for internal switching and the output fault shutdown function can protect the chip from fault conditions. The MAX8728 also provides adjustable power timing function.

The new LTC3240 voltage regulator charge pump can be used for portable product power management

The LTC3240-2.5/3.3 regulated general-purpose buck-boost charge pump in a 2×2mmDFN package has a wide input range of 1.8-5.5V and can output up to 150mA. When the input voltage exceeds the output voltage, the device operates in low-dropout regulator (LDO) mode. If the input voltage drops to 100mV difference from the output voltage, the device automatically switches to boost mode. For light loads, the device operates in high-efficiency, low-power Burst Mode to extend battery life.

When boosting higher loads, the LTC3240 automatically switches to a low noise constant frequency mode of operation. The patented constant frequency architecture features both low input and low output ripple, and the high switching frequency of 1.2MHz allows the use of tiny external ceramic capacitors, reducing solution size and cost. In addition to the flat (0.75) 2×2mm DFN package, the LTC3240 requires very few external components, only one floating capacitor and two bypass capacitors, making the device an extremely compact solution for space-constrained applications. Other features include soft-start to prevent excessive inrush current at startup, output disconnect during shutdown, current limiting, and thermal shutdown circuits.

The LTC3240 features a regulated output suitable for a wide range of applications such as digital cameras, PDAs, media players, measuring instruments and cellular phones. Its low ripple performance makes it ideal for applications sensitive to variable frequency operation such as audio and RF power supplies as well as thin PC and I/O cards.