Due to their portability, battery-operated, tablet platforms require diverse power conversion due to multiple features and functions that operate simultaneously along with a large LCD display backlight. Since these devices are primarily battery powered, good power conversion efficiency is necessary to extend operating times between charging cycles. As with all portable products, internal circuit board component density and height requirement force the smallest solution sizes for power management devices. Kinetic Technologies offers solutions to meet the required small footprint and the high functionality tablets need for lighting, display, camera flash, DC/DC power conversion and over-voltage and surge protection IC switches.
Buck and Boost Converters
Tablet operating systems typically use highly integrated system power management ICs. However, not all voltages are available and in some point of load applications, such as camera modules or Wi-Fi/Bluetooth transceiver modules, circuitry is located some distance away from the centralized PMIC and require local regulation.
Point of load voltage regulators provide a local supply rail with high efficiency
Single output high efficiency DC/DC switching regulators can provide either a step-up or step-down voltage output
Kinetic Technologies’ general-purpose input/output (GPIO) technology is low voltage and offers general purpose expanders designed for microcontrollers when additional I/Os are needed, ensuring additional interconnections are kept to a minimum.
As an input, the expander programs the polarity, latch, pull-up, pull-down and interrupt functions. For a system with noisy input, our GPIO technology also provides a seamless debounce function with programmable debounce time. Working as an output, this technology can?program output stage with bank/pin selectable push-pull or open-drain options, and can also program four drive strengths of the output stage to optimize rise/fall times.
Tablets LCD display backlights require multiple white LEDs that have large displays that consume the most significant portion of the device battery power budget. LEDs are normally connected in series and therefore require a compliance voltage significantly higher than the battery voltage.
Panel size and resolution determine the number of white LEDs (WLED) required to produce the necessary screen brightness
Dimming techniques to control the brightness can range from simple linear LED brightness control to sophisticated high efficiency PWM control to achieve contrast ratios of typically 20,000:1
High accuracy current sinks to provide uniform backlight across larger panel sizes
High efficiency boost power conversion required to minimize demands on battery power consumption and maximize the battery life between charge cycles
Multiple series/parallel strings of WLED drivers to match the display panel needs
Multiple programming options from simple PWM signal control to full-featured I2C interfaces.
Advanced design, low drop-out current sinks with tight linearity characteristics to maintain constant LED current accuracy over all battery voltage extremes
High efficiency boost converters with integrated protection against LED open and short-circuit conditions
High Efficiency 4-CH LED Backlight Driver with Dual LCD Bias Power
Overvoltage and Surge Protection ICs
Battery powered portable platforms like Tablets, require switches to protect external input power ports used for operation and battery charging and to control internal load circuits.
Input power port protection is a paramount concern in tablet design, as reliable power sources may not always be used.
Over-voltage, and surge protected load switches protect battery charge management and operating tablet circuits, by breaking the connection between the power source and the internal circuitry, in the event the device is connected to a faulty power source or subjected to an abnormal stress condition.
Programmable and fixed over-voltage protection (OVP) shutdown thresholds.
Wrong adapter up to +40V
Reverse voltage down to -6V
Transient voltage protection up to 200V, compliant to IEC61000-4-2 (Level 4)
ESD protection compliant to ±8kV contact, ±15kV air gap and ±2kV human body model.
Single or dual devices with Uni or Bi-directional blocking
Integrated load switches provide internal power switching and are controlled by simple GPIO logic.
Eliminate the need for bias and level shift circuits associated with discrete MOSFET switches
Provides slew-rate limited turn-on with reverse current blocking and output discharge mode to de-select functions when not required to extend battery life.