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Home Healthcare

 

Home healthcare products cover a wide assortment of functions from digital thermometers to blood pressure meters.  These devices are typical battery powered form disposable alkaline battery cells to rechargeable Li-Ion/polymer batteries.  For products with LCD displays, backlight and bias power management is needed.  Devices without large displays often use indicator LED lamps.  All devices need voltage regulation for internal supply rails and in cases where external power sources may be plugged in, power port protection can be necessary for product reliability.

 

+ LCD Bias Supplies  

 

LCD panels require positive/negative bias supply voltages that must be stepped up and inverted from product battery power source. 

 

  • Programmable voltage LCD bias supply drivers provide 2-channel regulated outputs using a single inductor for high power conversion efficiency and minimized solution size. 
  • LCD panel size sets the voltage and load current requirements for a bias driver. 
  • Advanced LCD bias drivers provide user adjustable boost headroom options to maximize efficiency for specific operating conditions.
  • Battery consumption is reduced farther during shutdown by minimizing unnecessary leakage current by the I2C bus.

 

Part NumberDescriptionPackagePackage Alt.Package Alt.1
KTD2150 2-Channel LCD Panel Bias Supply with Single Inductor WLCSP-15 2.2x1.45-15 TDFN 3x2.5-14  
KTD2151 2-Channel LCD Panel Bias Supply with Single Inductor WLCSP-15 2.2x1.45-15 TDFN 3x2.5-14  
KTD2151B 2-Channel LCD Panel Bias Supply with Single Inductor WLCSP-15 2.2x1.45-15 TDFN 3x2.5-14  
KTD2159 2-Channel LCD Panel Bias Supply with Single Inductor WLCSP-15 2.2x1.45-15 TDFN 3x2.5-14  

+ LCD Backlight LED Drivers  

 

Home healthcare products utilize LCD displays require LED backlighting. 

 

  • Monochrome LCD displays may use colored or whites LEDs and may only need simple on/off or brightness control. 
  • Color LCD display need white LED backlights with power management solutions for high power conversion efficiency over a flexible control range to minimize battery power consumption.
  • LED backlight driver solutions range from simple linear LED brightness controllers to full feature high efficiency WLED array drivers to cover most LCD panel backlight applications.
  • LED backlight controllers and drivers offer external control and programming options from PWM signal to full featured I2C interfaces to fit a wide range of product requirements and processor capabilities.

 

Part NumberDescriptionPackagePackage Alt.Package Alt.1
KTD104 Linear-mode 4-Channel LED Driver SOT23-8 TDFN22-8  
KTD105 Linear-mode 5-Channel LED Driver SOT23-8 TDFN22-8  
KTD108 Linear-mode 4-Channel LED Driver SOT23-8 TDFN33-16  
KTD109 Linear-mode 5-Channel LED Driver SOT23-8 TDFN33-16  
KTD117 Linear-mode 4+2 -Channel LED Driver TDFN33-12    
KTD251 Step-Up LED Driver with PWM Control TSOT23-6    
KTD2531 Step-Up LED Driver with PWM Control TSOT23-6    
KTD2536 Step-Up LED Driver with PWM Control TSOT23-6    
KTD2500 Step-Up LED Driver with ExpressWire or PWM Control TDFN22-6    
KTD2505R Step-Up LED Driver with ExpressWire or PWM Control TDFN22-6    
KTD2511C Step-Up LED Driver with PWM Control TSOT23-6 TDFN22-8    
KTD2511D Step-Up LED Driver with PWM Control TSOT23-6 TDFN22-8    
KTD2801 Step-Up LED Driver with Internal Diode and ExpressWire/PWM Dimming TSOT23-6 TDFN22-6    
KTD2801A Step-Up LED Driver with Internal Diode and ExpressWire/PWM Dimming TSOT23-6 TDFN22-6    
KTD314 High Efficiency, Wide Voltage Range 20-LED Driver TQFN33-16    
KTD315 High Efficiency, Wide Voltage Range 30-LED Driver TQFN33-16    
KTD3112 High Efficiency Step-Up 2-Ch LED Driver, 25V OVP TQFN33-16 WLCSP-9    
KTD3113 High Efficiency Step-Up 3-Ch LED Driver, 25V OVP TQFN33-16 WLCSP-9    
KTD3116-1 High Efficiency Step-Up 2-Ch LED Driver, 31V OVP WLCSP-9    
KTD3117-1 High Efficiency Step-Up 3-Ch LED Driver, 31V OVP WLCSP-9    
KTD3118 High Efficiency Step-Up 2-Ch LED Driver, 42V OVP WLCSP-9    
KTD3119 High Efficiency Step-Up 3-Ch LED Driver, 42V OVP WLCSP-9    
KTD3122 2-Ch Step-Up LED Driver with Integrated Power Diode TQFN33-16 WLCSP-12  
KTD3156 6-Ch Step-Up LED Driver with PWM-Control Mixed-Mode Dimming TQFN33-16 WLCSP-16  
KTD3156B 6-Ch Step-Up LED Driver with PWM-Control Mixed-Mode Dimming, low duty dimming TQFN33-16 WLCSP-16  
KTD325 High Efficiency, Wide Voltage Range 30-LED RGB Driver TQFN33-16    

+ Power Interface  

 

Home healthcare devices often need internal voltage rail on/off control to reduce standby or shutdown state power consumption in order to maximize battery life. 

 

  • Integrated load switches provide simplified microcontroller I/O controlled power switching to eliminate the need for bias and level shift circuits associated with discrete MOSFET switches.
  • Load switches also provide slew rate limited turn on and shutdown mode reverse current blocking.

 

Part NumberDescriptionPackagePackage Alt.Package Alt.1
KTS1601 SRC P-Ch Load Switch with Reverse Blocking WLCSP-4 1.0 x 1.0mm    
KTS1601-1 SRC P-Ch Load Switch with Reverse Blocking and Output Discharge WLCSP-4 1.0 x 1.0mm    
KTS1605 SRC P-Ch Load Switch with Reverse Blocking WLCSP-6 1.0 x 1.5mm    
KTS1605-1 SRC P-Ch Load Switch with Reverse Blocking and Output Discharge WLCSP-6 1.0 x 1.5mm    
KTS1670 Load Switch with adjustable OVP WLCSP-6 1.0 x 1.2mm    
KTS1671 Load Switch with fixed and adjustable OVP WLCSP-6 1.0 x 1.2mm    
KTS1674 OVP Switch with Reverse Blocking and 100V surge Protection WLCSP-20 2.57 x 2.07mm    
KTS1678 OVP Switch with Single Input, Dual Output Switches with Surge Protection and Individual Enables WLCSP-28 2.96 x 1.67mm    
KTS1679-1 OVP Switch with Single Input, Dual Output Switches with 10V Surge Protection, Individual Enables, Selectable OVP & BAT SNS pin WLCSP-28 2.96 x 1.67mm    
KTS1680 100V Surge Protected OVP Switch WLCSP-12 1.3 x 1.96mm    
KTS1681 Ultra-Fast 100V Surge Protected OVP Switch, with VDET output and MIC function WLCSP-12 1.3 x 1.96mm    
KTS1682 Ultra-Fast 100V Surge Protected OVP Switch, with VDET output and MIC function WLCSP-12 1.3 x 1.96mm    
KTS1685 OVP Switch with 100V Surge Protection WLCSP-9 1.33 x 1.33mm    
KTS1686 Ultra-Fast 100V Surge Protected OVP Switch, with Bidirectional Blocking WLCSP-15 1.6 x 2.1mm    
KTS1688 OVP Switch with Reverse Blocking and Current Limiting WLCSP-9 1.22 x 1.22mm    
KTS1689A 100V Surge Protected OVP Switch WLCSP-12 1.3 x 1.96mm    

+ RGB LED Drivers  

 

Home healthcare devices which do not have an LCD display use LED indicator lamps to inform the user.  Devices with LCD display may also use LED indicator lamps to show function or battery states. 

 

  • Multicolor RGB LED drivers allow for simplified program and control of LED color and brightness in an ultra small footprint package.
  • 3-channel RGB LED drivers permit custom color and brightness control.
  • 4-channel RGBW devices allow for driving a white LED in addition to the RGB LED. 
  • Programming interface options include Express Wire or I2C to ease integration with a wide variety of processors and operating systems.

 

Part NumberDescriptionPackagePackage Alt.Package Alt.1
KTD2021 3-Channel RGB LED Driver with ExpressWire Control TSOT23-6    
KTD2022 3-Channel RGB LED Driver with ExpressWire Control UTDFN-8 1.5x1.5mm    
KTD2023 4-Channel RGBW LED Driver with ExpressWire Control UTDFN-8 1.5x1.5mm    
KTD2026 3-Channel RGB LED Driver with I2C Control UTDFN-8 1.5x1.5mm    
KTD2027 4-Channel RGBW LED Driver with I2C Control UTDFN-8 1.5x1.5mm    
KTD2037 3-Channel RGB LED Driver with I2C Control, AutoBlinQ™ UTDFN-8 1.5x1.5mm    

+ Voltage Regulation  

 

Regardless of battery or external power, home healthcare devices need voltage regulation for system microcontrollers, memory and application specific circuit functions. 

 

  • For light load current requirements, a dual output linear regulator can provide a compact low cost voltage regulation solution. 
  • When High power conversion efficiency is desired, a DC/DC switching regulator can be a better choice.  DC-DC switching regulators are available for voltage step-up and step-down applications.

 

Part NumberDescriptionPackagePackage Alt.Package Alt.1
KTB851 600mA Step-down Converter with Output Load Discharge UTDFN-6 1.6 x1.6 x 0.55mm TDFN-6 1.6 x1.6 x 0.75mm TSOT23-5
KTB851-1 600mA Step-down Converter UTDFN-6 1.6 x1.6 x 0.55mm TDFN-6 1.6 x1.6 x 0.75mm TSOT23-5
KTA201 Low Noise, Fast Reponse Dual 150mA LDO Regulators SOT23-6 TDFN22-8  
KTC218 Wide Output Range Step-Up Converter SOT23-5 TSOT23-5  

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