brief introduction:
National Semiconductor Corporation announced that the company's PowerWise series of energy-efficient chip products have added three new power | regulator management products, namely LM2755 LED driver, LM2757 inductorless switching capacitor boost regulator and LM4510 high voltage Boost regulator. These three compact new products can drive LEDs and organic light-emitting diode (OLED) displays, making them ideal for portable multimedia devices. In addition to extending the battery life of the system, they also support a new generation of visual effects.
The LM2755 driver chip is available in a small, slim microSMD package that provides multi-band backlighting for three independent red, green, and blue LEDs, or white indicator LEDs controlled by a programmable pattern generator. The chip is not only programmable, but also has multi-level light and dark control and an I2C compatible interface, so it can flexibly meet customers' needs for various multimedia functions, such as games and mobile TV.
The LM2757 is also available in a microSMD package that requires only four small ceramic capacitors, so the overall solution does not exceed 12 square millimeters. The chip can output very high current and can select the output voltage through the pin, which can be used to illuminate peripheral devices without an inductor, such as backlighting the keypad. The LM2757 chip also provides regulated power to USBOn-The-Go peripherals.
National's LM4510 is a synchronous high-voltage boost regulator that supports OLED displays, which are thinner and consume less power than liquid crystal displays. The chip is available in a small LLP package and is up to 85% efficient, extending battery life.
National Semiconductor LM2755LED Driver Specifications
National's LM2755 chip is a charge pump that provides a constant current LED driver that can drive three LEDs with a total output current of up to 60mA. The current waveform of each LED is trapezoidal, and all parameters including delay, rise time, high and low level can be set through the I2C compatible interface. The LM2755 driver can operate with a 3/2-gain gain pump or with a “pass-mode†operation, eliminating the need for inductors for maximum efficiency. The proper gain to keep the current stable can be set based on the forward voltage of the LED to ensure maximum energy efficiency over the specified input voltage range. The LM2755 is available in an 18-bump microSMD package with up to 90% energy efficiency that extends battery life.
National Semiconductor LM2757 Boost Regulator Specifications
National's LM2757 chip is a constant frequency preset switched capacitor boost regulator operating at up to 1.25MHz, but with very low output voltage noise. This regulator eliminates the need for an inductor and determines the gain factor (3/2x or 2x) based on the selected input and output voltages, then operates with a charge pump for energy efficiency optimization.
In addition, the different configurations of this chip can provide different drive currents, such as output voltage of 4.1V, drive current up to 100mA; output voltage of 4.5V, drive current up to 110mA; output voltage of 5V, drive current It is up to 180mA. The output voltage pin of the LM2757 has a very high impedance. After the chip is turned off, another power supply can supply power to the regulated output bus. The LM2757 is available in a 12-bump microSMD package with up to 90% efficiency, which helps extend battery life.
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brief introduction:
National Semiconductor LM4510 Organic Light Emitting Diode (OLED) Display Power Specifications
National's LM4510 is a current mode step-up DC/DC converter with a 1.2A NMOS switch.
The NMOS switch allows a lithium battery to output 80mA of drive current at 18V. The chip can be operated in different modes. For example, when the load is high, the chip can adopt the synchronous operation mode; if the load is low, the asynchronous operation mode can be used instead. Because of this flexibility, the energy efficiency is as high as 85. % can further extend battery life.
In addition, the chip uses a true shutdown isolation design to avoid current leakage through the ground in standby mode. The chip helps reduce system size and system cost by eliminating the need for an external Schottky diode. In addition, the chip can increase the input voltage of 3.2V to 18V to 5V, and then output a stable current. System designers can use external compensation networks to dramatically improve transient response of lines and loads, especially for USB power supplies or OLED display bias circuits. Finally, it is worth mentioning that the LM4510 chip provides a feedback fault and short circuit protection for the output, so it is a very reliable solution.
The LM4510 is available in a thermally enhanced 10-pin LLP package.
National Semiconductor's power management products
Multi-function portable electronic products and even larger devices that use AC power are subject to strict restrictions on size and energy. For this reason, National Semiconductor has been committed to providing various design solutions for these applications to solve the design of power management systems. problem. Whether you are a novice in designing a power supply system or a power management expert, you can take advantage of National Semiconductor's products, technical experience, and design hardware|tools. For example, they can use the more complex power supply system developed by the company. Electronic products that meet environmental standards and can be launched in the shortest possible time
National Semiconductor offers a variety of high-performance silicon products, including switching regulators such as the company's flagship SIMPLESWITCHER® family, as well as specialty applications such as white LED drivers and PoE controllers.
Price and availability
The LM2755 and LM2757 chips are priced at $1.50 each, while the LM4510 chip is priced at $1.80 each. All three chips are priced at 1,000 units and are available in volume.
National Semiconductor's PowerWise brand
National Semiconductor's range of high energy efficiency products are based on the PowerWise brand name. This family of products features a high performance/power ratio and can be paired with other National Semiconductor chips to create an exceptionally energy-efficient solution. National's PowerWise family of chips includes power management systems, operational amplifiers, interface chips and data conversion systems.
National Semiconductor Corporation
National Semiconductor is a well-known analog technology supplier and continues to develop high value-added analog chips and subsystems. The company's advanced products include power management circuits, display drivers, audio and operational amplifiers, interface products, and data conversion solutions. National's analog chip products are targeted at mobile phones, displays, communications systems, medical equipment, automotive electronics systems, industrial systems, and test and measurement equipment. The US National Semiconductor Corporation is located in Santa Clara, California, USA. (SantaClara), as of May 27, 2007, had a turnover of $1.93 billion in fiscal year 2007.
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National Semiconductor Corporation announced that the company's PowerWise series of energy-efficient chip products have added three new power | regulator management products, namely LM2755 LED driver, LM2757 inductorless switching capacitor boost regulator and LM4510 high voltage Boost regulator. These three compact new products can drive LEDs and organic light-emitting diode (OLED) displays, making them ideal for portable multimedia devices. In addition to extending the battery life of the system, they also support a new generation of visual effects.
The LM2755 driver chip is available in a small, slim microSMD package that provides multi-band backlighting for three independent red, green, and blue LEDs, or white indicator LEDs controlled by a programmable pattern generator. The chip is not only programmable, but also has multi-level light and dark control and an I2C compatible interface, so it can flexibly meet customers' needs for various multimedia functions, such as games and mobile TV.
The LM2757 is also available in a microSMD package that requires only four small ceramic capacitors, so the overall solution does not exceed 12 square millimeters. The chip can output very high current and can select the output voltage through the pin, which can be used to illuminate peripheral devices without an inductor, such as backlighting the keypad. The LM2757 chip also provides regulated power to USBOn-The-Go peripherals.
National's LM4510 is a synchronous high-voltage boost regulator that supports OLED displays, which are thinner and consume less power than liquid crystal displays. The chip is available in a small LLP package and is up to 85% efficient, extending battery life.
National Semiconductor LM2755LED Driver Specifications
National's LM2755 chip is a charge pump that provides a constant current LED driver that can drive three LEDs with a total output current of up to 60mA. The current waveform of each LED is trapezoidal, and all parameters including delay, rise time, high and low level can be set through the I2C compatible interface. The LM2755 driver can operate with a 3/2-gain gain pump or with a “pass-mode†operation, eliminating the need for inductors for maximum efficiency. The proper gain to keep the current stable can be set based on the forward voltage of the LED to ensure maximum energy efficiency over the specified input voltage range. The LM2755 is available in an 18-bump microSMD package with up to 90% energy efficiency that extends battery life.
National Semiconductor LM2757 Boost Regulator Specifications
National's LM2757 chip is a constant frequency preset switched capacitor boost regulator operating at up to 1.25MHz, but with very low output voltage noise. This regulator eliminates the need for an inductor and determines the gain factor (3/2x or 2x) based on the selected input and output voltages, then operates with a charge pump for energy efficiency optimization.
In addition, the different configurations of this chip can provide different drive currents, such as output voltage of 4.1V, drive current up to 100mA; output voltage of 4.5V, drive current up to 110mA; output voltage of 5V, drive current It is up to 180mA. The output voltage pin of the LM2757 has a very high impedance. After the chip is turned off, another power supply can supply power to the regulated output bus. The LM2757 is available in a 12-bump microSMD package with up to 90% efficiency, which helps extend battery life.
[1] [2] Next page
brief introduction:
National Semiconductor LM4510 Organic Light Emitting Diode (OLED) Display Power Specifications
National's LM4510 is a current mode step-up DC/DC converter with a 1.2A NMOS switch.
The NMOS switch allows a lithium battery to output 80mA of drive current at 18V. The chip can be operated in different modes. For example, when the load is high, the chip can adopt the synchronous operation mode; if the load is low, the asynchronous operation mode can be used instead. Because of this flexibility, the energy efficiency is as high as 85. % can further extend battery life.
In addition, the chip uses a true shutdown isolation design to avoid current leakage through the ground in standby mode. The chip helps reduce system size and system cost by eliminating the need for an external Schottky diode. In addition, the chip can increase the input voltage of 3.2V to 18V to 5V, and then output a stable current. System designers can use external compensation networks to dramatically improve transient response of lines and loads, especially for USB power supplies or OLED display bias circuits. Finally, it is worth mentioning that the LM4510 chip provides a feedback fault and short circuit protection for the output, so it is a very reliable solution.
The LM4510 is available in a thermally enhanced 10-pin LLP package.
National Semiconductor's power management products
Multi-function portable electronic products and even larger devices that use AC power are subject to strict restrictions on size and energy. For this reason, National Semiconductor has been committed to providing various design solutions for these applications to solve the design of power management systems. problem. Whether you are a novice in designing a power supply system or a power management expert, you can take advantage of National Semiconductor's products, technical experience, and design hardware|tools. For example, they can use the more complex power supply system developed by the company. Electronic products that meet environmental standards and can be launched in the shortest possible time
National Semiconductor offers a variety of high-performance silicon products, including switching regulators such as the company's flagship SIMPLESWITCHER® family, as well as specialty applications such as white LED drivers and PoE controllers.
Price and availability
The LM2755 and LM2757 chips are priced at $1.50 each, while the LM4510 chip is priced at $1.80 each. All three chips are priced at 1,000 units and are available in volume.
National Semiconductor's PowerWise brand
National Semiconductor's range of high energy efficiency products are based on the PowerWise brand name. This family of products features a high performance/power ratio and can be paired with other National Semiconductor chips to create an exceptionally energy-efficient solution. National's PowerWise family of chips includes power management systems, operational amplifiers, interface chips and data conversion systems.
National Semiconductor Corporation
National Semiconductor is a well-known analog technology supplier and continues to develop high value-added analog chips and subsystems. The company's advanced products include power management circuits, display drivers, audio and operational amplifiers, interface products, and data conversion solutions. National's analog chip products are targeted at mobile phones, displays, communications systems, medical equipment, automotive electronics systems, industrial systems, and test and measurement equipment. The US National Semiconductor Corporation is located in Santa Clara, California, USA. (SantaClara), as of May 27, 2007, had a turnover of $1.93 billion in fiscal year 2007.
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