Smartphone platforms are evolving at an extreme pace; adding new features, new functions and larger displays with higher definition. This is placing a significant burden on the battery power source, where technology development moves at a much slower pace resulting in a continual demand for more efficient and cost-effective ways to use the limited available power. At Kinetic, we pride ourselves in meeting those demands with highly efficient, compact power management solutions, offering cost effective solutions for display power, camera flash, power conversion, over-voltage protection and load switching applications.
Camera LED Flash Drivers
Smartphone LED camera flash requirements are mainly determined by camera resolution, quality and functionality.
Low cost / low resolution cameras may only require a single flash LED with a simple driver
High-resolution smartphone cameras require multiple high brightness flash LEDs that support video and torch modes
Single low current, low noise linear or boost flash LED drivers
Multi-channel high efficiency flash LED drivers that can support independent programmable LED torch and flash modes, with drive currents up to 1.5A per channel
Smartphone LCD display backlights require multiple white LEDs that consume a significant portion of the device battery power. 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 efficiency boost power conversion required to minimize demands on battery power consumption and maximize the battery life between charge cycles
Single or multiple channel LED 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
1-Channel LED Driver plus 2-Channel LCD Panel Bias
Over-Voltage and Surge Protection
Battery powered portable platforms 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 mobile phone and smartphone design, as reliable power sources may not always be used. The level of protection is dependent upon phone model and local country requirements
Over-voltage, and surge protected load switches protect battery charge management and operating handset 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.
Smartphones typically use highly integrated power management ICs (PMIC) to supply the multitude of internal system power rails. However, in cases where a specific voltage rail is unavailable, or the device to be powered is far from the PMIC, a voltage regulator can be added to provide the necessary supply.
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