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LTC4352 Datasheet(PDF) 1 Page - Analog Devices |
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LTC4352 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 18 page  Data Sheet LT4423 28V, 2A Ideal Diode and Load Switch Rev. 0 DOCUMENT FEEDBACK TECHNICAL SUPPORT One Analog Wa y, Wilmington, MA 01887 -2356, U.S.A. Tel: 781.329.47 00 ©2024 Analog Devices, Inc. Al l rights rese rve d. FEATURES Internal 200mΩ Power Path Wide Operating Voltage Range: 1.9V to 28V Reverse Current Protection Load Switch Capability Low 10µA Quiescent Current Fast 3µs Response to Load Steps Low 500nA Off State Current Smooth Switchover in Diode-OR Applications Integrated Thermal Protection 10-Lead (3mm x 2mm x 0.75mm) LDFN Package APPLICATIONS Schottky Diode Replacement Battery and Wall Adapter Diode ORing Backup Battery Diode ORing Industrial and Consumer Hand-Held Applications GENERAL DESCRIPTION The LT®4423 is a 1.9V to 28V ideal diode and load switch with integrated P-channel MOSFETs. When enabled, 15mV forward voltage regulation minimizes power dissipation while increasing operating headroom and efficiency compared to a Schottky diode. Using two LT4423s in diode-OR applications provide a seamless transfer to the highest available voltage under varying input supply conditions. A non-enabled LT4423 blocks up to 28V in either direction or polarity while exhibiting less than 1μA (typical) leakage current, providing orders of magnitude improvement over typical Schottky diodes, which leads to extended battery life. Fast OUT to IN reverse bias detection minimizes reverse current, preventing undesired charging of input batteries. The open-drain STATUS output pulls low when the LT4423 is in shutdown, reverse bias, or under thermal protection. Integrated thermal detection protects from overtemperature conditions by disabling the power path. All registered trademarks and trademarks are the property of their respective owners. SIMPLIFIED APPLICATION DIAGRAM Figure 1. USB PD 3.0 and Back-Up Battery Supply Figure 2. LT4423 I-V CURVE TO LOAD USB PD 3.0 PRIMARY POWER SOURCE 5V TO 20V BACK-UP Li-Ion CELL 3.6V ON OFF R1 4.7kΩ SHDN SHDN D1 C1 1µF N/C GND IN OUT STATUS LT4423 GND IN OUT STATUS LT4423 TA = 25°C IN = 12V 2 IN2 THERMAL RELIEF DC FORWARD VOLTAGE DROP (mV) 10 100 400 0.001 0.01 0.1 1 2 |
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