Tiny Power Protection Switch

August 11, 2014 | 23:31
Tiny Power Protection Switch
Tiny Power Protection Switch

Texas Instruments have introduced the industry's smallest, high power efficiency, bidirectional 18 V, 5 A protection switches. These devices save board space and will extend battery life in portable and adapter-powered devices. The eFuse TPS259404 and TPS259422 integrated circuits include back-to-back FETs to provide bidirectional current control and result in up to 50 percent reduction in PCB footprint compared with discrete solutions. These smart eFuse ICs can maintain over/under voltage threshold accuracy of 2 percent thereby eliminating the need for a separate supply voltage supervisor chip.

The PGOOD, FLT and current monitor output signals IMON provide comprehensive system status information.

Main features:

  • 2.7 V to 18 V operating voltage, 20 V ABSmax
  • 42 mΩ RON(typical)
  • 0.6 A to 5.3 A adjustable current limit (±8%)
  • IMON current indicator output (±8%)
  • 200 µA Operating IQ (typical)
  • 15 µA Disabled IQ (typical)
  • ±2% Overvoltage, undervoltage thresholds
  • Reverse current blocking
  • 1 µs reverse voltage shutoff
  • Programmable dVo/dt control
  • Power good / fault outputs
  • Two overcurrent fault response options
    • TPS25942: I(LIMIT) with thermal shutdown
    • TPS25944: 4 ms fault timer then shutoff
  • −40°C to 125°C Junction temperature range
  • UL2367 recognition pending
  • UL60950 safe during single point failure
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