Linear Technology introduced digital programmable devices LT3071 linear regulator
Linear Technology Corporation (Linear Technology Corporation) introduced a digitally programmable linear regulator family of second device LT3071, available in the current monolithic 5A LDO, the device with the lowest dropout voltage, low noise and most fast transient response. 5A when the ultra-low dropout voltage is 85mV. In the 10Hz to 100kHz bandwidth, 5A, when the output voltage noise of only 25uVRMS. With the LT3071 and its unity gain bandwidth of 1MHz minimum 15uF ceramic output capacitor, output 4.5A for a fast load step, only produces a 30mV overshoot / undershoot, thus saving a lot of body capacitance, space and cost. LT3071 is ideal for low voltage, high current devices (for example: FPGA, DSP, ASIC, microprocessor), power-sensitive communications, server / storage unit and post-high-power step-down regulator applications.
LT3071's output voltage can be digitally set, set from 0.8V to 1.8V (in 50mV increments). The accuracy of the entire line, load and temperature range is strictly defined as +/- 1%. Analog output margining function can be continuous within the range of +/- 10% output voltage regulation system, which is very beneficial when developing and debugging the system. A power good (PowerGood) mark indicates the output voltage is in a stable state, or the device is in UVLO state, the tags also provide early warning of thermal fault indication. An output current monitor supply output current proportional Dongtai that (IOUT/2500), it can be directly measured, can also use a resistor Zhongjie and converted to voltage, allowing the calculation of load or power. LT3071's input voltage range of 0.95V to 3.0V, the bias supply voltage range of 2.2V to 3.6V. Bias supply to the internal NMOS pass device provides the gate drive.
Multiple LT3071 devices can be easily paralleled to achieve higher output current and spread the heat throughout the board. Tracking can control a power supply input for the LT3071 step-down regulator. The tracking drive upstream buck regulator to maintain the LT3071's input voltage VOUT + 300mV, minimizing power consumption. If the output voltage is dynamically changed, then the tracking function automatically adjusts the buck regulator output voltage to maintain constant efficiency. Internal protection circuitry includes UVLO, the reverse current protection, with power foldback current limiting and accurate thermal shutdown with hysteresis.
LT3071 in a thermally enhanced, Flat (0.75mm) 28-lead 4mm x 5mm QFN package, E and Class I devices from -40 ° C to +125 ° C junction temperature range. 1,000-piece quantities, the price of both devices were $ 4.20 per tablet and $ 4.80.
Photo Caption: Analog margining of ultra-fast, digitally programmable, ultra-low dropout, low noise 5A LDO
* Output Current: 5A
* Dropout voltage: typically 85mV
* Digital Programmable VOUT: 0.8V to 1.8V, 50mV increments
* Analog output margin control: the range of +/- 10%
* Output current monitor: Provides IOUT/2500, when the IOUT = 5A 2mA
Low output noise: 25uVRMS (10Hz to 100kHz)
* Parallel: 10A output with two devices to achieve
* Accurate current limit: +/- 20%
* In the line, load and temperature range of +/- 1% accuracy
* With low ESR ceramic output capacitor (minimum 15uF) is stable
* High-frequency PSRR: 1MHz to 30dB at
* Enable function ON / OFF output
* VIOC pin control buck converter, in order to maintain low power consumption and optimize efficiency
* PWRGD / UVLO / Thermal Shutdown mark
* The current limit with foldback protection
* Thermal shutdown
* Profile (0.75mm) thermally enhanced 28-lead 4mm x 5mm QFN package
Expo in the "low-carbon king"
Shanghai World Expo is the first formally proposed a "low carbon" concept of the Expo, the Expo area large-scale implementation of solar energy, new energy vehicles, smart grid, LED lighting demonstration, and these green projects, and some have become "carbon highest in the world. "
Reporters from the 7th Shanghai World Expo held a special press conference was informed that the application of the Shanghai World Expo design large-scale solar power projects, the use of new technologies and more, is the World Expo history, the largest solar power technology one.
The topic was held yesterday afternoon at a press conference, Shanghai officials said frankly: they are more land is "demonstration", Zhang Xian Shanghai is determined to advance these technologies, but large-scale promotion Yin Jishu conditioned take some time.
According to the Shanghai Economic and Information Technology Committee and deputy director Zhou Minhao introduced in the solar photovoltaic power generation, the application of the Expo Design building-integrated photovoltaic solar power projects and the largest and most is the World Expo history, the scale of solar power technology biggest. According to reports, theme pavilion roof solar panel area of 30,000 square meters, is the world's largest single area of the solar roof, the generating capacity for the Shanghai 4500 residents a year, equivalent to annual savings of about 1,000 tons of standard coal.
In the China Pavilion, Theme Pavilion, Expo Center, the performing arts center on the roof and glass walls installed total capacity of more than 4.68 MW solar power facilities, the annual carbon dioxide emissions of 4,000 tons, is the largest solar photovoltaic demonstration area.
In the new energy vehicles, Shanghai World Expo will have more than 1000 new energy vehicles in the Expo and run around. One Expo with a new energy vehicles in public transportation zero emissions, including 120 electric buses, 36 super capacitor bus and six fuel cell vehicles by bus in the form of demonstration runs, 140 electric venue vehicles and 100 fuel cell sightseeing by car to meet the public demand for a particular form, can reduce carbon dioxide emissions 13,000 tons. 4 places around the park meet the national standard for low-emission hybrid vehicles.
In addition, the Shanghai World Expo in the China Pavilion, Expo Axis, performing arts centers and other venues in the Urban Best Practices Area region using semiconductor light LED, a kilometer World Expo axis on the use of more than 200 ten thousand LED, 9 more than 10,000 of the different types of lamps and lamp with full color; "Shanghai World Expo comprehensive smart grid demonstration project" is China's first comprehensive smart grid demonstration projects, to achieve a new energy access, energy storage systems, intelligent substation, distribution automation, Fault repair management system, the power of information collection system, power quality monitoring, intelligent power buildings, homes and other electric vehicle charging and discharging station demonstration applications.
Zhou Minhao also put forward in 2010, Shanghai will organize 260 200 energy technology projects and contract energy management projects, energy savings 600,000 tons of standard coal.
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