LTC7890
RECOMMENDED FOR NEW DESIGNSLow IQ, Dual, 2-Phase Synchronous Step-Down Controller for GaN FETs
- Part Models
- 2
- 1ku List Price
- Starting From $4.27
Overview
- GaN drive technology fully optimized for GaN FETs
- Wide VIN range: 4 V to 100 V
- Wide output voltage range: 0.8 V ≤ VOUT ≤ 60 V
- No catch, clamp, or bootstrap diodes needed
- Internal smart bootstrap switches prevent overcharging of high-side driver supplies
- Internally optimized, smart near zero dead times or resistor adjustable dead times
- Split output gate drivers for adjustable turn on and turn off driver strengths
- Accurate adjustable driver voltage and UVLO
- Low IQ: 5 μA (48 VIN to 5 VOUT, Ch 1 On)
- Programmable frequency (100 kHz to 3 MHz)
- Synchronizable frequency (100 kHz to 3 MHz)
- Spread spectrum frequency modulation
- 40-lead (6 mm × 6 mm), side wettable, QFN package
The LTC7890 is a high performance, dual step-down, dc-to-dc switching regulator controller that drives all N-channel synchronous gallium nitride (GaN) field effect transistor (FET) power stages from input voltages up to 100 V. The LTC7890 solves many of the challenges traditionally faced when using GaN FETs. The LTC7890 simplifies the application design while requiring no protection diodes and no other additional external components compared to a silicon metal-oxide semiconductor field effect transistor (MOSFET) solution.
The internal smart bootstrap switches prevent overcharging of the BOOSTx pin to the SWx pin high-side driver supplies during dead times, protecting the gate of the top GaN FET. The LTC7890 internally optimizes the gate driver timing on both switching edges to achieve smart near zero dead times, significantly improving efficiency and allowing for high frequency operation, even at high input voltages. Alternatively, the user can adjust the dead times with external resistors for margin or to tailor the application.
The gate drive voltage of the LTC7890 can be precisely adjusted from 4 V to 5.5 V to optimize performance and to allow the use of different GaN FETs or even logic level MOSFETs.
APPLICATIONS
- Industrial power systems
- Military avionics and medical systems
- Telecommunications power systems
Documentation
Data Sheet 1
User Guide 3
Technical Articles 1
Video 4
Brochure 1
Analog Dialogue 3
Rarely Asked Question 3
Webcast 2
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 |
|---|---|---|---|
| LTC7890RUJM#PBF | 40-Lead QFN (6mm x 6mm, Plastic Side Wettable) | ||
| LTC7890RUJM#TRPBF | 40-Lead QFN (6mm x 6mm, Plastic Side Wettable) |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareTools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LTC7890
LTpowerCAD
Design tools for the following parts are available in LTpowerCAD:
- LTC7890
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
High Frequency, Dual Output, Step-Down Supply with Si FETs
Resources
High Frequency, Dual Output, Step-Down Supply with Si FETs
Resources
High Frequency, Dual Output, Step-Down Supply with EPC GaN FETs
Resources
High Frequency, Dual Output, Step-Down Supply with EPC GaN FETs