Ultra low-power load switch ICs extend battery life with nA-rated leakage current

The Low Quiescent (LQ) series of load switch ICs from Littelfuse features reduced parasitic leakage current and low on-resistance. Several compact package options offer a high level of integration.

The Littelfuse LQ series load switch ICs provide industry-leading low on-resistance and leakage current measured in nanoamps to reduce power consumption, resulting in higher system efficiency and extended battery life.

Suitable for use in space-constrained applications, the LQ switches feature a highly integrated design: the switches take passives, transistors, and reverse current blocking diodes that are often mounted externally, and integrate them in the IC package to give substantial space and bill-of-materials cost savings. This high level of integration also results in on-resistance that is some two-thirds lower than that of discrete solutions.

These load switches support a voltage range from 1.1 V to 5.5 V. Two maximum current options are available: the 0.77 mm x 0.77 mm x 0.46 mm CSP4 package is rated for current up to 2 A. The 0.97 mm x 1.47 mm x 0.55 mm CSP6 package option has a 4 A rating. 

An additional 0.97 mm x 0.97 mm x 0.55 mm CSP4 package option for the 2 A device gives more opportunity for drop-in replacement of other components, to accelerate time-to-market.

The LQ series load switches also offer several features to protect a circuit from damage caused by transient currents. Slew-rate control and soft-start protects the system from inrush currents. Input and output voltage detection enables reverse-current blocking. Quick output discharge prevents unpredictable behavior in downstream circuitry.

Introduction to LQ series

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