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Load Switch ICs

A load switch IC is a power supply IC fabricated using a CMOS process that contains an output transistor and an output driver. The IC versions of load switches provide a solution footprint much smaller than those composed of discrete components. Moreover, load switch ICs feature low-voltage operation, low on-resistance and low current consumption and provides additional functions. House in ultra-small packages measuring less than 1 mm2, Toshiba's load switch ICs are ideal for space-critical portable applications.

Features

1．Ultra-small packages
Saves board space due to the use of WCSP packages

2．Low on-resistance
Provides low on-resistance close to that of MOSFETs thanks to a small-geometry process

3．Rich ancillary functions
Incorporates various ancillary functions such as inrush current limiting, overcurrent protection, thermal shutdown and output discharge that are complicated to build with discrete components

4．Wide operating voltage range
1.1 V to 5.5 V

5．Product assurance
Standardized on-resistance, leakage and other characteristics over temperature that are difficult to achieve with MOSFETs

This is a photo of the WCSP6B

This is a photo of the WCSP4


Space-Saving Packages and Ancillary Functions

While the TCK Series of load switch ICs features low operating voltage, low on-resistance and rich ancillary functions, it is offered in ultra-small packages. It simplifies your efforts of improving system performance.

This is a illustration that compared load switch ICs with composite device.

TCK10xG Series

The TCK10xG Series consists of CMOS load switch ICs with low-voltage operation, low on-resistance, low current consumption and a control input pin. It features a wide operating voltage range of 1.1 to 5.5 V and low on-resistance of 55 mΩ typical (VIN = 3.3 V, 500 mA). Additionally, all the load switches of the TCK10xG Series have inrush current reduction and thermal shutdown circuits. An auto discharge function and an overcurrent protection circuit are available on some load switches. Those without overcurrent protection provides an output current of 1 A, while those with overcurrent protection are offered with output currents of 0.2 A, 0.5 A and 0.8 A.
The TCK10xG Series is available in ultra-small WCSP6B with a lead pitch of 0.4 mm (measuring 0.8 mm × 1.2 mm × 0.64 mm (max)) and WCSP4 (measuring 0.79 mm × 0.79 mm × 0.5 mm (max)), making it ideal for applications that require high-density assembly such as portable devices.

Features
  • Wide operating voltage range (VIN = 1.1 to 5.5 V)
  • Low RON
    RON = 50 mΩ (typ.) @ VIN = 5.0 V, 500 mA
    RON = 55 mΩ (typ.) @ VIN = 3.3 V, 500 mA
    RON = 75 mΩ (typ.) @ VIN = 1.8 V, 500 mA
    RON = 120 mΩ (typ.) @ VIN = 1.2 V, 800 mA
  • Low current consumption
    IQ = 8 µA (typ.) @ IOUT = 0 mA
    (TCK101G、TCK102G)
    IQ = 20 µA (typ.) @ IOUT = 0 mA
    (TCK103G,TCK104G,TCK105G)
  • Low standby current (IQ (OFF) = 0.1 µA (typ.)
  • Inrush current reduction circuit
  • Overcurrent protection circuit (except TCK101G and TCK102G)
  • Thermal shutdown circuit
  • Auto discharge (except TCK102G)
  • Control pin connected to a pull-down resistor
  • Ultra-small packages
    WCSP6B (0.8 mm × 1.2 mm × 0.64 mm (max))
    WCSP4 (0.79mm × 0.79mm × 0.5mm (max))
On-Resistance of the TCK101G and TCK102G
(Ta=25℃)This is a graph showing the On-Resistance of the TCK101G and TCK102GApplication Examples
  • Cell phones
  • Digital still cameras (DSCs)
  • Small portable devices
  • Portable audio players
  • Tablet PCs

Application Circuit Example

The illustration of Circuit Example of Load Switch ICs.

Package Outline Dimensions

WCSP6B Package

The illustration of package outline dimension of WCSP6B

WCSP4 Package

The illustration of package outline dimension of WCSP4

Product Lineup

Load Switch ICs: TCK Series (Under Development)
Package Part Number Abs. Max Ratings Operating Voltage Range
(V)		 Features
Output
Current DC
(A)		 Input
Voltage
(V)		 Inrush Current Reduction Thermal Shutdown Overcurrent Protection Auto Discharge Control Pin Connection
WCSP6B
 TCK101G** 1.0 6.0 1.1～ 5.5 Y Y - Y Pull-down (Active-High)
TCK102G** 1.0 Y Y - -
TCK104G** 0.5 Y Y Y Y
TCK105G** 0.8 Y Y Y Y
WCSP4
 TCK106G** 1.0 6.0 1.1 ～ 5.5 Y - - -
TCK107G** 1.0 Y - - Y
TCK108G** 1.0 Y - - Y Open (Active-Low)
  • ** Under development

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