Electronics from reversed supplies shield by brand new ideal diode


The Power by Linear LTC4376 from Analog Devices Inc., an active diode with an internal 7 A MOSFET and −40 V reverse input protection. The LTC4376 replaces power Schottky diodes in diode-OR and supply holdup circuits, which reduces voltage and power losses by 10×.

The LTC 4376 is a 7A ideal diode that uses an internal 15mΩ N-channel MOSFET to replace a Schottky diode when used in diode-OR and high current diode applications. The LTC4376 reduces power consumption, heat dissipation and PC board area.

The LTC4376 controls the forward voltage drop across the internal MOSFET to ensure smooth current delivery without oscillation even at light loads. If a power source fails or is shorted, a fast turn-off minimizes reverse current transients. The LTC4376 also easily ORs power sources to increase total system reliability.

With its low operating voltage, small solution size and the ability to withstand reverse input voltage, the LTC4376 excels in portable battery applications. A shutdown mode is available to reduce the quiescent current to 9μA. The SHDN pin can also control the forward current path when an external MOSFET is used in series with the internal MOSFET in a back-to-back configuration.

The LTC4376 has a wide operating range of 4V to 40V which allows operation during cold crank conditions and transient conditions. The LTC4376 also protects against negative inputs to –40V, which can occur when the automotive battery is reversed.

For more information, visit: www.analog.com