Ideal Diode IC minimizes power dissipation.
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Press Release Summary:
Model LTC4411 low loss Power Path(TM) IC controls integrated, 140 mOhm, P-channel MOSFET to create near ideal diode function for power switchover or load sharing. When conducting, voltage drop across MOSFET is as low as 28 mV, minimizing power dissipation and dropout voltage when ORing multiple power sources. Quiescent current is less than 40 µA for load currents up to 100 mA. Model LTC4411 operates from 2.6-5.5 V supplies and is housed in SOT-23 package.
Original Press Release:
Increase Diode-OR Efficiency with 2.6A, Ultralow Forward Voltage Ideal Diode
MILPITAS, CA - January 13, 2004 - Linear Technology Corporation introduces the LTC4411, a low loss Power Path(TM) controller that controls an integrated P-channel MOSFET to create a near ideal diode function for power switchover or load sharing. When conducting, the voltage drop across the MOSFET is as low as 28mV, which is as much as ten times less than a comparable Schottky diode. This minimizes power dissipation and dropout voltage when ORing multiple power sources for extended battery life, low input voltage operation or minimal heat generation. In addition, the LTC4411 improves system reliability by offering several protection features including current limiting, thermal protection and reverse current detection for input supply protection. A logic-level input pin simplifies microcontroller interfacing, and an open drain status pin indicates the conduction status of the LTC4411. This pin can be used to drive the gate of an external P-channel MOSFET for switching between two input supplies. The LTC4411 operates from 2.6V to 5.5V supplies and is housed in a SOT-23 package. Applications include devices that are powered from a battery and AC/DC input, load sharing and low voltage backup power systems.
The LTC4411 contains a 140mOhm P-channel MOSFET. During normal forward operation, the drop across the MOSFET is regulated to as low as 28mV. Quiescent current is less than 40uA for load currents up to 100mA. If the output voltage exceeds the input voltage, the MOSFET is turned off and less than 1uA of reverse current flows from OUT to IN. Maximum forward current is limited to a constant 2.6A (typical) and internal thermal limiting circuits protect the part during fault conditions. During shutdown, the LTC4411 consumes less than 25uA.
The LTC4411 is rated for operation from -40°C to 85°C. 1,000-piece pricing begins at $1.60 each.
Summary of Features: LTC4411
Low Loss Replacement for an ORing Diode
Small Regulated Forward Voltage: 28mV
2.6A Maximum Forward Current
Low Forward ON Resistance: 140mOhms
Low Reverse Leakage Current <1uA
2.6V to 5.5V Operating Range
Protection: Current Limit, Thermal, Reverse Current
5-Lead ThinSOT Package
Company Background
Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products include operational, instrumentation and audio amplifiers; voltage regulators,power management devices, DC-DC converters and voltage references; comparators; monolithic filters; communications interface circuits; one-chip data acquisition sub-systems; pulse-width modulators and sample-and-hold devices; and high frequencydevices. Applications for Linear Technology's high performance circuits include wireless and broadband telecommunications infrastructure, cellular telephones, networking products and satellite systems, notebook and desk top computers, computer peripherals, video/multimedia, industrial and medical instrumentation, automotive electronics, factory automation, process control, military and space systems, and high-end consumer products including digital cameras, MP3 players and other electronic products.
