LT7809
RECOMMENDED FOR NEW DESIGNS135V Synchronous Buck Controller with Symmetrical Sink/Source Capability and Dynamically Adjustable Output Voltage Programming
Wide input buck controller with symmetrical sink and source currents and split gate driver topology.
- Part Models
- 2
- 1ku List Price
- Starting From $11.61
Overview
- Wide Input Voltage (VIN - VSS) Range: 8.0V to 135V (140V ABS MAX)
- Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 135V (140V ABS MAX)
- Dynamically Adjustable VOUT Programming
- Symmetrical Sink and Source Current Capability for Fast VOUT Slewing Up or Down
- Split-Output Gate Drivers for Adjustable Turn-On and Turn-Off Driver Strengths and Small Dead-Times (35ns)
- Floating I/O Control Pins Referenced to System GND
- 100% Duty Cycle Operation
- Programmable or Synchronizable Frequency (100kHz to 2.5MHz)
- 32-Pin (5mm x 5mm) QFN Package
The LT7809 is a high-performance, step-down, DC/DC switching regulator controller that drives a N-channel synchronous silicon metal oxide semiconductor field effect transistor (MOSFET) stage and can operate voltages up to 135V. Its constant frequency current mode architecture allows a phase-lockable switching frequency of up to 2.5MHz.
The gate drive voltage for the LT7809 is 10V to drive standard-threshold MOSFETs to maximize efficiency. An internal charge pump allows for 100% duty cycle operation.
OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LT7809 features a precision 0.8V reference, enabling the output voltage to be statically programmed from 0.8V to 135V. An output voltage adjustment pin, combined with the LT7809’s symmetrical sink and source current capability, allows the output voltage to be dynamically slewed up or down.
APPLICATIONS
- Industrial Power Systems
- Telecommunications Power Systems
- Test Equipment
Documentation
Data Sheet 1
User Guide 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT7809RUH#PBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LT7809RUH#TRPBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) |
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareTools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LT7809
LTpowerCAD
Design tools for the following parts are available in LTpowerCAD:
- LT7809
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Evaluation Kits
135V Buck Controller with Dynamically Adjustable Output Voltage