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Protection controller tailored for portable electronics

Posted: 15 Jul 2010     Print Version  Bookmark and Share

Keywords:Protection controller  car battery adapters  portable electronics 

Linear Technology Corp. rolls out the LTC4362, a 2.5V to 5.5V protection controller that is tailored for portable electronics with multiple power supply options that charge via wall and car battery adapters and USB ports. The over-voltage and over-current protector is designed to safeguard low voltage, portable electronics like cell phones, MP3/MP4 players, digital cameras that charge via wall and car battery adapters and USB ports from damaging input voltage transients and current surges.

The LTC4362 utilises a 2 per cent accurate 5.8V over-voltage threshold to detect an over-voltage event and responds quickly within 1µs (max) to isolate the downstream components from the input. Overvoltage protection of up to 28V is achieved with an internal, avalanche rated, low RDS(ON) MOSFET, and rides through inductive cable transients without requiring transient voltage suppressors (TVS) or other external components in most applications. In addition, the LTC4362 monitors the voltage drop across an internal current sense resistor to provide a 20 per cent accurate, 1.5A over-current threshold.

The LTC4362 controls an internal 40mΩ N-channel MOSFET so that under normal operation it provides a low loss path from the input to the load. Inrush current limiting is achieved with a controlled gate voltage slew rate. If the voltage at the input exceeds the over-voltage threshold of 5.8V, the GATE is pulled low within 1µs to protect the load.

The LTC4362 features a soft shutdown controlled by the ON pin and provides a gate drive output for an optional external P-channel MOSFET for reverse voltage protection. A power good output pin indicates gate turn on.

The LTC4362 is available in two options; the LTC4362-1 latches off after an over-current event, whereas the LTC4362-2 performs an auto-retry following a 130ms delay. Following an over-voltage condition, both options automatically restart with a start-up delay.

Specified over the full commercial and industrial temperature ranges, the LTC4362 is offered in 8-pin, 2mm x 3mm DFN packages. Evaluation boards and samples are available online. The LTC4362 is priced at Rs.74.72 ($1.60) each in 1,000-piece quantities, and is available today in production.

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