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General-Purpose Linear ICs

Power Supply ICs

  • Where can I find information on land pattern dimensions for surface-mount packages?

    Visit the "Package Information" page of this website for general specifications. For more details, contact your local Toshiba sales representative.

  • About absolute maximum ratings (Understanding datasheet values)

    As an example, an "Electrical Characteristics" table for the TCR2EF and TCR2EE Series is shown below.

    Definitions of the Terms in the Table
    1. Input voltage (VIN)
      Absolute maximum voltage that can be applied between the input and GND
    2. Control voltage (Vct)
      Voltage range over which an IC can be turned on and off
    3. Output voltage (Vout)
      Output voltage range that an IC can tolerate
    4. Output current (Iout)
      Maximum output current (load current) that can flow thru an IC
    5. Power dissipation (PD)
      Maximum power that the IC can dissipate. The PD value of a surface-mount device varies with pc board materials and land pad dimensions. The power dissipation (PD) of a low-dropout (LDO) voltage regulator can be calculated as follows:
      PD = VIN × IB +(VIN - VOUT)× IOUT
      where VIN is input voltage, VOUT is output voltage, IB is bias current and IOUT is output current.
    6. Operational temperature range (Topr)
      The allowable ambient temperature range when the device is operating under a specified condition
    7. Junction temperature (Tj)
      Maximum junction temperature that the IC can tolerate
    8. Storage temperature (Tstg)
      Ambient temperature range in which the IC can be stored with no voltage applied

  • About electrical characteristics (Understanding datasheet values)

    As an example, an "Electrical Characteristics" table for the TCR2EF and TCR2EE Series is shown below.

    Definitions of the Terms in the Table
    1. Output voltage (VOUT):
      This is the most important and key characteristic of a power supply IC. VOUT defines the accuracy of output voltage regulation under the specified test conditions.
      As shown in the table, it differs depending on the output voltage range.
      ICs with an output voltage of 1.8 V or higher are regulated with an accuracy of ±1.0%, while those with an output voltage of less than 1.8 V are regulated with an accuracy of ±18 mV.
    2. Input voltage(VIN):
      Range of input voltage that can be applied to a power supply IC. The minimum input voltage, if specified, indicates the input voltage that is required at the minimum to deliver the specified typical output current (IOUT), unless otherwise noted.
    3. Line regulation (Reg・line)
      Output voltage changes over the specified input voltage range, with the output current and the junction temperature kept constant (Tj=25°C).
      This rating does not include any output voltage change caused by input voltage transients.
    4. Load regulation (Reg・load)
      Output voltage changes over the specified output current range, with the input voltage and the junction temperature kept constant (Tj=25°C).
      This rating does not include any output voltage change caused by output current transients.
    5. Bias current (IB)
      Current consumed by the power supply IC when it is operating
    6. Standby current (IB(OFF)) :
      Current consumed by the power supply IC when it is idle
    7. Input-output voltage differential (VIN-VOUT)
      Differential between the minimum input operating voltage and the output voltage required for the IC to keep the output voltage in regulation.
      Also called dropout voltage.
    8. Average temperature coefficient of output voltage (TCVO)
      Change in the output voltage per degree centigrade under the specified test conditions. TCVO of 100 ppm/°C (typ.) means that a 1°C increase in temperature causes the output voltage to increase by 0.1 mV. It should be noted, however, that all devices do not exhibit the same TCVO value; it should be considered only as a guide.
    9. Output noise voltag (VNO):
      RMS value of the noise voltage that occurs at the output when the IC is operating
    10. Ripple rejection (R.R.)
      The ratio of the ripple amplitude (i.e., a small alternating-current component) in the IC input voltage to that in the output voltage after being rejected by the circuit
      R.R. (dB) =20log (ΔVIN/ΔVOUT)
    11. Load transient response (ΔVOUT) :
      Change in the regulated output voltage that occurs as a result of a change in load current when the input voltage is stable enough for output voltage regulation
    12. Control voltage (ON) (VCT (ON) ):
      Voltage required to turn on the IC
    13. Control voltage (VCT (OFF) ) :
      Voltage required to turn off the IC

Motor Drivers

  • MOS devices are typically sensitive to electrostatic discharge (ESD). How should I protect MOSFETs against ESD?

    Proper ESD protection is implemented in each device.

  • Is it OK to make deliberate use of the equivalent diode structure between the drain (D) and the source (S)?

    Typically, the DMOS output section has an equivalent parasitic diode structure. Read the handling precautions.

  • What is the definition of “allowable power dissipation”?

    The allowable power dissipation is the maximum power dissipation permitted at up to the rated maximum junction temperature (Tj) of 150℃ when the ambient temperature, Ta, is 25℃. User should calcurate the derated allowable power dissipation because it should be decreased for higher ambient temperature.

  • How many parts are supplied per tape-and-reel?

    The quantity of devices per reel is 1000, 2000 or other. It differs from device to device. Ask your local Toshiba sales representative.

  • How can I calculate current and power consumption?

    Broadly speaking, the power consumption of a motor driver consists of two factors: the power consumed due to the IC bias current and the power consumed due to current flowing through the output section. Both these factors are affected by the drive voltage and the duty cycle.
    For details of how to calculate the power consumption of a motor driver, see the appropriate datasheet or contact us.

  • Is it OK to connect capacitors to the output lines?

    There is a limitation to the maximum capacitance values at the output lines, which varies with conditions and differs from device to device. Contact us and allow for design margins.

  • Are decoupling capacitors required across power and ground lines?

    Decoupling capacitors are required in order to stabilize IC operation by reducing the impedance of power lines and to absorb back-EMF from the motor coil when it is de-energized.

  • What would happen if static electricity were discharged to the motor driver logic? Isn’t any protection implemented on-chip?

    If static electricity is introduced into a motor driver from a charged object, the on-chip general-purpose CMOS logic may be permanently damaged. Because the gate oxide layer at input gates is only several tens to several hundred angstroms thick, it may be punctured by an electrostatic discharge (ESD) of several hundred to several thousand volts. To protect input gates from ESD, Toshiba's motor drivers have protection circuitry at logic input pins. However, ESD should never be discharged directly into a device; even with protection circuitry, the device might be degraded or damaged.

  • How should the power and input signals be sequenced at power-up and power-down?

    Generally, a device should be powered up in the following sequence to ensure that the absolute maximum ratings will be met: 1) ground, 2) Vcc, 3)VM(Power supply to motor), 4) input signals. It is recommended to power down a device in the reverse order.
    Products that have the input tolerant function (products that do not have an input diode in the direction from the input to the power source) can apply input signals when no power is supplied. Proper power sequences differ from device to device. For details, contact us.

  • What are the differences between the absolute maximum ratings and the recommended operating conditions?

    Absolute maximum ratings are limiting values that should not be exceeded even instantaneously. Exposure to conditions beyond these ratings may affect the lifetime and reliability of a device.
    The recommended operating conditions define the conditions for actual device operation and should be observed to ensure that a device operates properly. Correct operation is not guaranteed if any of the recommended operating conditions is exceeded. If there is a possibility that a device will be subjected to a condition beyond any of them, you should review your system design or select another device.

LED Drivers

  • What are the differences between the absolute maximum ratings and the recommended operating conditions?

    Absolute maximum ratings are limiting values that should not be exceeded even instantaneously. Exposure to conditions beyond these ratings may affect the lifetime and reliability of a device.
    The operating conditions define the conditions for actual device operation and should be observed to ensure that a device operates properly. Correct operation is not guaranteed if any of the operating conditions is exceeded. If there is a possibility that a device will be subjected to a condition beyond any of them, you should review your system design or select another device.

  • You have announced that the TB62705CFG and TB62725BFG 8-channel LED drivers will be discontinued. Do you have any replacements for these devices?

    The TB62777FG is recommended as a replacement for these LED drivers.
    It should be noted, however, that they differ in the output drive current range. For details, see the datasheet or contact us.

  • You have announced that the TB62706BFG and TB62726AFG 16-channel LED drivers will be discontinued. Do you have any replacements for these devices?

    The TC62D748AFG is recommended as a replacement for these LED drivers.

  • I want to connect multiple LED drivers in cascade. Is it okay if the SCK waveform becomes shallow?

    You may want to reduce EMI or circuit noise by slowly changing SCK, but doing so makes it difficult to meet its setup time requirement relative to SIN. If it is not met, data transfer will not be performed properly.
    Be sure to meet the SIN-SCK setup time specified in the Electrical Characteristics table in the datasheet.

  • How many watts does the REXT resistor need to be rated at?

    The REXT pin is a constant-voltage output. The output voltage is somewhere around 1 V, but it differs slightly from device to device. The permissible power of the resistor can be calculated as V2/REXT. 1/8 or 1/16 W will do.

  • How can I program the output current?

    The output current is programmable with a single resistor connected to the REXT pin. See an appropriate datasheet for how to calculate the output current.

  • What is the definition of “allowable power dissipation”?

    The allowable power dissipation is the maximum power dissipation permitted at up to the rated maximum junction temperature (Tj) of 150℃ when the ambient temperature, Ta, is 25℃. The allowable power dissipation should be derated for ambient temperature because it changes with temperature.

  • How many parts are supplied per tape-and-reel?

    The quantity of devices per reel is 2000.

  • How can I calculate current and power consumption?

    Broadly speaking, the power consumption of an LED driver consists of two factors: the power consumed due to the IC bias current and the power consumed due to current flowing through the output section. Both these factors are affected by the drive voltage and the duty cycle. For details of how to calculate the power consumption of an LED driver, see the appropriate datasheet or contact us.

  • Are decoupling capacitors required across power and ground lines?

    Decoupling capacitors are required in order to stabilize IC operation by reducing the impedance of power lines.

  • How should the power and input signals be sequenced at power-up and power-down?

    Generally, a device should be powered up in the following sequence to ensure that the absolute maximum ratings will be met: 1) ground, 2) Vcc, 3) input signals. It is recommended to power down a device in the reverse order.

·Before creating and producing designs and using, customers must also refer to and comply with the latest versions of all relevant TOSHIBA information and the instructions for the application that Product will be used with or for.