Battery powered wearables and fitness devices are typically very compact in size and have limited battery capacities. These devices must use high efficiency power conversion to maximize user time between charging cycles. Internal load circuit switching and input power port protection are required to connect to battery charging devices.


Buck and Boost Converters

Wearable and fitness devices operate from small, limited capacity, battery cells with a voltage level that varies based on their state of charge.

  • Most application circuits within a wearable device operate at a voltage level lower than that of the battery
  • To conserve power and maximize battery operation between charges, small, high efficiency DC-DC voltage step-down converters are recommended to supply the required regulated voltage rails
  • High efficiency DC-DC switching step-down regulators can provide the solution
Part Number Description
KTB851 600mA Step-down Converter with Output Load Discharge
KTB851-1 600mA Step-down Converter
KTC218 Wide Output Range Step-Up Converter

GPIO

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.

GPIO technology is the perfect fit for wearables and fitness technology.

Part Number Description
KTS1620 Low Voltage 24-Bit I2C-bus I/O Expander

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 wearables and fitness design, as reliable power sources may not always be used.

  • 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.

Product Highlights:

  • Programmable and fixed over-voltage protection (OVP) shutdown thresholds.
  • Input protection
    • 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

The compact nature of wearables and fitness devices leave very little room for discrete and associated passive components. 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.

Product Highlights:

  • Extremely low IN to OUT resistance
  • Tiny footprint
  • Operation down to 1.8V
Part Number Description
KTS1601 SRC P-Ch Load Switch with Reverse Blocking
KTS1601-1 SRC P-Ch Load Switch with Reverse Blocking and Output Discharge
KTS1605 SRC P-Ch Load Switch with Reverse Blocking
KTS1605-1 SRC P-Ch Load Switch with Reverse Blocking and Output Discharge
KTS1612 Dual-Input Push Button Reset IC with Two Discharge Paths
KTS1613 Dual-Input Push Button Reset IC
KTS1662 Load Switch with fixed and adjustable OVP
KTS1670 Adjustable Over-Voltage Protection Switch
KTS1671 Load Switch with fixed and adjustable OVP
KTS1681 Ultra-Fast 100V Surge Protected OVP Switch, with VDET output and MIC function
KTS1681A 4 Amp Over-Voltage Protection IC with Sense Output
KTS1682 Ultra-Fast 100V Surge Protected OVP Switch, with VDET output and MIC function
KTS1685 OVP Switch with 100V Surge Protection
KTS1686 Ultra-Fast 100V Surge Protected OVP Switch, with Bidirectional Blocking
KTS1688 OVP Switch with Reverse Blocking and Current Limiting
KTS1689A 100V Surge Protected OVP Switch

RGB LED Drivers

Multicolor RGB LEDs are often incorporated into wearables and fitness devices as function indicator lamps or for fashion lighting.

  • RGB LED drivers allow simplified programmable control of LED color and brightness

Product Highlights:

  • 3-channel RGB LED drivers permit custom color control
  • 4-channel RGBW devices allow for driving a white LED in addition to the RGB LED
  • Multiple programming options include I2C or ExpressWire to ease integration with a wide variety of processors and operating systems
  • Wide range of ramp up/down timing for slow fade in/out effects and complex repeating patterns
  • Ultra-small package footprint
Part Number Description
KTD2021 3-Channel RGB LED Driver with ExpressWire Control
KTD2022 3-Channel RGB LED Driver with ExpressWire Control
KTD2023 4-Channel RGBW LED Driver with ExpressWire Control
KTD2026 3-Channel RGB LED Driver with I2C Control
KTD2027 4-Channel RGBW LED Driver with I2C Control
KTD2037 3-Channel RGB LED Driver with I2C Control, AutoBlinQ™

USB Data Line Protection ICs

Part Number Description
KTU1000 USB Hi-Speed Switch with Fault Protection
KTU1001 USB D+/D- Hi-Speed or SBU1/2 Switch with Fault Protection
KTU1001A USB D+/D- Hi-Speed or SBU1/2 Switch with Fault Protection
KTU1101 USB Type-C Port Protector for CC and SBU Pins