Market Overview

Touchstone Expands Its Low-Power Current-Sense Amplifier Portfolio; Two New ICs Extend State-of-the Art Performance for Portable and Fixed-Platform Applications


Touchstone has added the unidirectional TS1102 and the bidirectional TS1103 to its current-sense amplifier portfolio. These new amplifiers combine a very low 1μA supply current, 200-µV VOS and very low gain error.

Milpitas, Calif. (PRWEB) October 24, 2012

Touchstone Semiconductor, Inc., a developer of high-performance analog integrated circuit solutions, today announced two new members of its 1μA current-sense amplifier portfolio – the unidirectional TS1102 and the bidirectional TS1103.

Starting at $0.61 each in 1,000-piece quantities, these new current-sense amplifiers combine a very low 1μA supply current, a 200-µV (max) VOS, and very low (0.5% (max) gain error for TS1102 and 0.6% (max) gain error for the TS1103 for cost-sensitive applications. Both CSAs offer a wide input common-mode voltage range from 2V to 25V and each is available in four gain options: 25V/V, 50V/V, 100V/V and 200V/V.

The low input offset voltage performance exhibited by these two new CSAs enables design engineers to achieve improved accuracy and reduced current-sense resistor expense without increasing the power consumption. This makes them suitable for portable applications where form factor and cost are important. Touchstone's current-sense amplifiers are the only ICs in the market that shatter the offset/power/price performance ceiling.

The TS1102 is form-factor identical to Maxim's MAX9938 and the MAX9634 CSAs. Its 200-µV (max) VOS is 60% lower than the MAX9938's input VOS and 20% lower than the MAX9634's input VOS. It is also pin-for-pin to the industry-standard, 100-µV (max) VOS TS1100.

The TS1103 IC is a symmetrical, high-side current-sense amplifier and pin-for-pin to Touchstone's industry-standard 100-µV (max) VOS TS1101 announced in March of this year. The TS1103's symmetrical architecture eliminates the load current “dead band” when switching from measuring battery discharge to measuring battery charge. This significantly simplifies customer designs while reducing power, saving board space and improving system accuracy. The TS1103 is self-powered and provides a SIGN comparator digital output that indicates the current flow direction.

The combination of a small form factor (SOT23-5 for the TS1102 and SOT23-6 for the TS1103), low supply current operation and variety of fixed gain options make these an ideal choice for low current, high-side current-sensing amplification. This includes applications such as battery-powered and portable devices, including mobile phones, notebook computers, power management systems, motor control, load protection, current-shunt measurement and smart battery packs and chargers.

Key Specifications

  •     Ultra-Low Supply Current: 1μA
  •     Wide Input Common Mode Range: +2V to +25V
  •     Low Input Offset Voltage: 200μV (max)
  •     Low Gain Error: 0.5% (max) TS1102; 0.6% (max) TS1103
  •     Voltage Output
  •     Packaging: 5-Pin SOT23 (TS1102) and 6-Lead SOT23 (TS1103)
  •     Four Gain Options Available:
  •      TS1102-25/ TS1103-25: Gain = 25V/V
  •     TS1102-50/ TS1103-50: Gain = 50V/V
  •     TS1102-100/ TS1103-100: Gain = 100V/V
  •     TS1102-200/ TS1103-200: Gain = 200V/V

Pricing starts at $0.61/each for the TS1102 and $0.84/each for the TS1103 in 1,000 piece quantities. The TS1102 and TS1103 are fully specified over the extended temperature range of −40°C to +105°C. These products are in stock and ready to ship from Digi-Key and Future Electronics.

Free samples and free demo boards are available to qualified engineers at The products are part of Touchstone Semiconductor's NanoWatt Analog™ high-performance analog integrated circuits portfolio.

About Touchstone
Touchstone Semiconductor, Inc., creates high-performance analog integrated circuit solutions that solve critical problems for electronics companies. Touchstone's second-source products are pin-compatible, specification identical solutions, offering customers a long-awaited alternative source for hard to get sole-sourced products. Touchstone's proprietary products provide unique combinations of features and performance that cannot be found from any other supplier. Founded in 2010, Touchstone is headquartered in Milpitas, Calif. Its investors include Opus Capital and Khosla Ventures. Find us at Twitter:@touchstonesemi or Facebook: Touchstone Semiconductor.
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