The evaluation circuit EVAL-LT7809-AZ features the LT7809: a 135V synchronous buck controller with symmetrical sink/source capability and dynamically adjustable output voltage programming. The symmetrical sink and source current capability allow for fast VOUT slewing up and down. Split gate drivers allow for easily adjustable turn-on and turn-off of FETs. Additionally, the IC features low IQ, up to 2.5MHz programmable/ synchronizable switching frequency, and a small 32-lead (5mm x 5mm) QFN package. These features allow for a wide variety of applications including industrial, military, medical, and telecommunications systems.
The EVAL-LT7809-AZ operates from a 16V to 100V input voltage range and generates a 60V, 5A output. Using the VOUTADJ feature, the output voltage can be lowered from60V down to 4V without skipping cycles. The EVAL-LT7809-AZ is set to a 500kHz switching frequency, which results in a small and efficient circuit.
The EVAL-LT7809-AZ supports output voltages from 0.8V to 100V. The evaluation circuit has been designed with 150V FETs. Various FETs of similar footprint can be substituted to fit a wide array of applications.
The EVAL-LT7809-AZ is a high-performance, flexible step-down regulator that can adjust its output voltage on-the-fly. The LT7809 data sheet gives a complete description of this part, its operation, and application information. The data sheet must be read in conjunction with this user guide for the EVAL-LT7809-AZ.
Design files for this circuit board are available at www.analog.com.
