LT4320 Datasheet | Linear Technology

Features Maximizes Power Efficiency n Eliminates Thermal Design Problems n DC to 600Hz n9V to 72V Operating Voltage Range n I = 1.5m A (Typical) Q n Maximizes Available Voltage n Available in 8-Lead (3mm × 3mm) DFN, 12-Lead MSOP and 8-Lead PDIP Packages n LT4320/LT4320-1 Ideal Diode Bridge Controller Description The LT®4320/LT4320-1 are ideal diode bridge controllers that drive four N-channel MOSFETs, supporting voltage rectification from DC to 600Hz typical. By maximizing available voltage and reducing power dissipation (see thermograph parison below), the ideal diode bridge simplifies power supply design and reduces power supply cost, especially in low voltage applications. An ideal diode bridge also eliminates thermal design problems, costly heat sinks, and greatly reduces PC board area. The LT4320’s internal charge pump supports an all NMOS design, which eliminates larger and more costly PMOS switches. If the power source fails or is shorted, a fast turn-off minimizes reverse current transients. The LT4320 is designed for DC to 60Hz typical voltage rectification, while the LT4320-1 is designed for DC to 600Hz typical voltage rectification. Higher frequencies of operation are possible depending on MOSFET size and operating load current. Applications Security Cameras Terrestrial or Airborne Power Distribution Systems n Power-over-Ethernet Powered Device with a Secondary Input n Polarity-Agnostic Power Input n Diode Bridge Replacement n n L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Patent pending. Typical Application + Thermograph of Passive Diode Bridge Temperature Rise (°C) TG1 OUTP LT4320 IN1 IN2 TG2 4320 TA01b CURRENT MOSFET (A) 2.5mΩ OUTPUT 9V TO 72V DIODE SBM 1040 15 32 49 66 84 ~ SBM1040 (×4) 2 4 6 8 10 0.6 3.5 6.7 11 16 BG2 OUTN BG1 Thermograph of LT4320 Driving Four MOSFETs INPUT DC TO...