Smart Watch Solution

Toshiba’s smart watch solutions get more performance in a smaller package

Image of Toshiba's Smart Watch Solution Designing power circuitry for smart watches and other wearables can be a challenge due to the expectations of today's consumer: more functionality, longer battery life, and smaller size. Toshiba's discrete components increase available board space and reduce passive current consumption to ensure long battery life. Toshiba offers tiny MOSFETs, diodes, and transistors in addition to feature-rich ICs such as LDO regulators, load switches, and the intelligent eFuse IC.

Power Supply Circuit Solutions

Wireless or contact charging presents design challenges with control and protection from the outside world, whether it is a short circuit condition or EMI.

Toshiba load switches or eFuse ICs can provide precise control in addition to overvoltage and overcurrent protection. These ICs are supported by various FETs and diodes.

Beyond the PMIC, there are requirements for LDOs and switches designed for rails leading to sensitive sensors, chipsets, and other modules. Performance is maximized by implementing low IQ load switches and LDOs which come in tiny wafer-level chip-scale packages.

Image of Toshiba's Power Supply Circuit Solutions Diagram

Interface Circuit Solutions

Another consideration is the interface side of any design. This involves the subsystem which manages sensor outputs and controls displays or wireless modules.

Sensors are becoming increasingly smaller and, as such, require ultra-low offset voltage and low noise op amps to help bring the recorded signal to a readable level. Toshiba offers op amps to address both of these requirements.

In addition, Toshiba offers high speed and high current ESD protection diodes to help manage unwelcome static shock, a concern when designing wearables and other handheld devices. This is achieved with minimal insertion loss, allowing for speeds up to 10 Gbps.

Image of Toshiba's Interface Circuit Solutions Diagram

Application Details Link:

https://toshiba.semicon-storage.com/us/semiconductor/application/smart-watch.html

Key Benefits

  • Wide portfolio of products
  • Reduces the need for board space with smaller packaging
  • Increases battery life by minimizing quiescent current (IQ)
  • Offers application notes and other material to help with design
  • Aids in new protection standards (IEC-62368-1) with eFuse

Supporting Components

MOSFETs

ImageManufacturer Part NumberDescriptionPart StatusDrain to Source Voltage (Vdss)Drive Voltage (Max Rds On, Min Rds On)Available QuantityView Details
MOSFET P-CH 20V 250MA CST3CSSM3J35CTC,L3FMOSFET P-CH 20V 250MA CST3CActive20V1.2V, 4.5V0View Details
MOSFET P-CH 20V 1.4A CST3SSM3J56ACT,L3FMOSFET P-CH 20V 1.4A CST3Active20V1.2V, 4.5V4826 - ImmediateView Details
MOSFET N-CH 20V 250MA CST3CSSM3K35CTC,L3FMOSFET N-CH 20V 250MA CST3CActive20V1.2V, 4.5V2840 - ImmediateView Details
MOSFET N-CH 20V 1.4A CST3SSM3K56ACT,L3FMOSFET N-CH 20V 1.4A CST3Active20V1.5V, 4.5V27772 - ImmediateView Details

Load Switch IC

ImageManufacturer Part NumberDescriptionRatio - Input:OutputOutput ConfigurationOutput TypeAvailable QuantityView Details
IC PWR SWITCH P-CHAN 1:1 4WCSPDTCK106AG,LFIC PWR SWITCH P-CHAN 1:1 4WCSPD1:1High SideP-Channel16951 - ImmediateView Details
IC PWR SWITCH P-CHAN 1:1 4WCSPDTCK107AG,LFIC PWR SWITCH P-CHAN 1:1 4WCSPD1:1High SideP-Channel27880 - ImmediateView Details
IC PWR SWITCH P-CHAN 1:1 4WCSPDTCK108AG,LFIC PWR SWITCH P-CHAN 1:1 4WCSPD1:1High SideP-Channel76 - ImmediateView Details

eFuse IC

ImageManufacturer Part NumberDescriptionAccuracyVoltage - InputCurrent - OutputAvailable QuantityView Details
EFUSE IC, AUTO RETRY, 6V VOLTAGETCKE805NA,RFEFUSE IC, AUTO RETRY, 6V VOLTAGE-4.4V ~ 18V5A1 - ImmediateView Details
EFUSE IC, LATCH TYPE, 6V VOLTAGETCKE805NL,RFEFUSE IC, LATCH TYPE, 6V VOLTAGE-4.4V ~ 18V5A0View Details

LDO Regulators

ImageManufacturer Part NumberDescriptionVoltage - Input (Max)Voltage - Output (Max)Current - OutputAvailable QuantityView Details
IC REG LINEAR 1.2V 300MA 4WCSP-FTCR3UG12A,LFIC REG LINEAR 1.2V 300MA 4WCSP-F5.5V-300mA2425 - ImmediateView Details
IC REG LINEAR 1.8V 300MA 4WCSP-FTCR3UG18A,LFIC REG LINEAR 1.8V 300MA 4WCSP-F5.5V-300mA7736 - ImmediateView Details
IC REG LINEAR 2.85V 300MA 4WCSPFTCR3UG285A,LFIC REG LINEAR 2.85V 300MA 4WCSPF5.5V-300mA9760 - ImmediateView Details
IC REG LINEAR 3V 300MA 4WCSP-FTCR3UG30A,LFIC REG LINEAR 3V 300MA 4WCSP-F5.5V-300mA5 - ImmediateView Details
IC REG LINEAR 3.3V 300MA 4WCSP-FTCR3UG33A,LFIC REG LINEAR 3.3V 300MA 4WCSP-F5.5V-300mA11040 - ImmediateView Details

FET Driver ICs

ImageManufacturer Part NumberDescriptionChannel TypeGate TypeVoltage - SupplyAvailable QuantityView Details
IC GATE DRVR HIGH-SIDE 6WCSPETCK401G,LFIC GATE DRVR HIGH-SIDE 6WCSPESingle-2.7V ~ 28V8794 - ImmediateView Details
IC GATE DRVR LOW-SIDE 6WCSPETCK402G,LFIC GATE DRVR LOW-SIDE 6WCSPESingle-2.7V ~ 28V8577 - ImmediateView Details

ESD Diodes for Power Line Protection

ImageManufacturer Part NumberDescriptionVoltage - Reverse Standoff (Typ)Voltage - Breakdown (Min)Voltage - Clamping (Max) @ IppAvailable QuantityView Details
TVS DIODE 5.5VWM 16VC SL2DF2B7BSL,L3FTVS DIODE 5.5VWM 16VC SL25.5V (Max)5.6V16V8863 - ImmediateView Details
TVS DIODE 12.6VWM CST2CDF2S14P2CTC,L3FTVS DIODE 12.6VWM CST2C12.6V12.9V-0View Details

Schottky Barrier Diodes

ImageManufacturer Part NumberDescriptionVoltage - DC Reverse (Vr) (Max)Current - Average Rectified (Io)Voltage - Forward (Vf) (Max) @ IfAvailable QuantityView Details
DIODE SCHOTTKY 30V 200MA CST2CTS520,L3FDIODE SCHOTTKY 30V 200MA CST230V200mA600mV @ 200mA239422 - ImmediateView Details
DIODE SCHOTTKY 30V 200MA CST2CTS521,L3FDIODE SCHOTTKY 30V 200MA CST230V200mA500mV @ 200mA12873 - ImmediateView Details
DIODE SCHOTTKY 30V 100MA SL2DSF01S30SL,L3FDIODE SCHOTTKY 30V 100MA SL230V100mA500mV @ 100mA29364 - ImmediateView Details
DIODE SCHOTTKY 30V 100MA SL2DSR01S30SL,L3FDIODE SCHOTTKY 30V 100MA SL230V100mA620mV @ 100mA7799 - ImmediateView Details

High Speed ESD Diodes

ImageManufacturer Part NumberDescriptionVoltage - Reverse Standoff (Typ)Voltage - Breakdown (Min)Voltage - Clamping (Max) @ IppAvailable QuantityView Details
TVS DIODE 3.6VWM 15VC SL2DF2B5M4ASL,L3FTVS DIODE 3.6VWM 15VC SL23.6V (Max)4V15V5145 - ImmediateView Details
TVS DIODE 5.5VWM 15VC SL2DF2B6M4ASL,L3FTVS DIODE 5.5VWM 15VC SL25.5V (Max)5.6V15V7083 - ImmediateView Details
TVS DIODE 24VWM 31.5VC SL2DF2B26M4SL,L3FTVS DIODE 24VWM 31.5VC SL224V (Max)21V31.5V (Typ)0View Details
TVS DIODE 3.3VWM 25VC SL2DF2B5M5SL,L3FTVS DIODE 3.3VWM 25VC SL23.3V (Max)3.6V25V (Typ)2456 - ImmediateView Details
TVS DIODE 5VWM 26.5VC SL2DF2B6M5SL,L3FTVS DIODE 5VWM 26.5VC SL25V (Max)5.5V26.5V (Typ)8856 - ImmediateView Details

Operational Amplifiers

ImageManufacturer Part NumberDescriptionPart StatusAmplifier TypeOutput TypeAvailable QuantityView Details
IC CMOS 1 CIRCUIT UFVTC75S67TU,LFIC CMOS 1 CIRCUIT UFVActiveCMOS-0View Details
Published: 2020-05-27