Solutions for Portable Systems from National Semiconductor
Solutions for Portable Systems
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Display and Illumination Solutions For Portable Devices
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With displays growing in size, vibrancy, and complexity, customers demand better display technology from their portable devices. National offers solutions for the display module including lighting management, flash drivers, backlighting drivers, interface bridges, and motor drivers for haptics touch technology. These solutions come in the smallest form factors and include advanced features such as ambient light sensing, audio adaptive lighting, and programmability. National features the most energy efficient, advanced, small form factor display solutions for the most demanding portable systems.
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Backlighting
National’s backlight drivers feature:
- Ambient light sensing
- Content-adjustable backlight control
- Audio synchronization
- I2C control
- Advanced dimming control
- Small footprint
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LED Flash
National’s flash drivers feature:
- Solutions to optimize image quality
- Flash, torch, and indicator modes support camera and video
- Effective thermal management
- LED protection mechanisms
- RF power amplifier synchronization and flash timeout
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Display Links
National's MPL display bridges:
- Reduce system power consumption
- Lower EMI with increased display color depth
- Reduce I/O for hinge applications
- Provide robust operation in an RF-intensive environment
- Proven serial interface
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Power Management For Portable Devices
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With the demand for increased battery life, portable devices require the most efficient power management devices. National Semiconductor provides industry leading power management solutions specifically designed for portable devices, featuring highest efficiency and smallest solution size. National’s solutions include:
- Power Management Units (PMU) featuring the highest level of integration
- Processor power featuring PowerWise® Adaptive Voltage Scaling (AVS) enabling industry leading system efficiency
- Discrete Switching Regulators and LDOs boasting smallest footprints and minimal external components requirements
- Power for RF Power Amplifiers that increase the RF PA efficiency with processor control
- Battery Management for single or dual cell Li-Ion batteries
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Solutions For Portable RF Subsystems
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The radio portion of portable devices often consumes a significant portion of the system power. National Semiconductor offers PowerWise® solutions that increase the efficiency of the Power Amplifier. Explore these innovative RF power products, RF detectors, and clock buffers for portable applications.
PowerWise® RF Adaptive Power Regulation for PAs
- Dynamically reduces PA supply for lower battery current below maximum transmit power
- Reduces current by 50% at 30 dBm over direct battery connection in GSM mode
- Saves 40% power over multistage WCDMA PAs
- Addresses the RF Power Amplifier (PA) efficiency problem with GSM/WCMDA multimode handsets without increased footprint
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Thermal Management For Portable Devices
As technological advances make heavy inroads into the Personal Mobile Devices space, the engineers are faced with new challenges to incorporate high-technology solutions while also building in safety mechanisms that ensure the highest levels of performance. Thermal monitoring and control are key components of these systems. As a pioneer in thermal management, National Semiconductor's extensive line of thermal management solutions and technology building blocks offer the highest accuracy, lowest power, and smallest packages to address applications including:
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Power Amplifier
- Compensate for thermally induced gain changes
- Prevents thermal run-away and save power
Backlight Monitor
- Color correction for RGB diode backlighting as a function of temperature changes
System Sensors
- Thermal management for the application processor and system
- Constant monitoring of PCB temperature to protect against operation outside of min and max temperature specs.
- Accurate over-temperature alarm is most important
Battery Monitor
- Li-Ion batteries must have temperature monitored to protect against charging when battery is too cold or too hot.
Local Oscillator/PLL
- Offers frequency stability over temperature. Frequency control over temperature is critical as frequencies increase, the requirements for frequency stability increase
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Featured thermal management solutions:
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| LM94022 |
Analog Temperature Sensor
- High accuracy
- Low voltage and current
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1.5V, SC70, Multi-Gain Analog Temperature Sensor with Class-AB Output |
| LM94023 |
Analog Temperature Sensor
- High accuracy
- Low voltage and current Small package
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1.5V, micro SMD, Dual-Gain Analog Temperature Sensor with Class AB Output |
| LM26LV |
Temperature Switch + Analog Temperature Sensor
- High accuracy
- Low voltage and current
- Small package
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1.6V, LLP-6 Factory Preset Temperature Switch and Temperature Sensor |
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Visit National’s Thermal Management Homepage for a complete list of products and design resources.
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