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Analog Devices LTC7890 | Demoboard EVAL-LTC7890-AZ
High Frequency, Dual Output, Step-Down Supply with EPC GaN FETs
Overview
| Topology | Buck Converter |
| Input voltage | 14-72 V |
| Switching frequency | 100-3000 kHz |
| Output 1 | 12 V / 20 A |
| Output 2 | 5 V / 20 A |
| IC revision | A |
Description
Evaluation circuit EVAL-LTC7890-AZ is a dual output synchronous step-down converter that drives all N-channel gallium nitride (GaN) field effect transistors (FETs). The EVAL-LTC7890-AZ evaluation board features EPC2218 100V FETs from EPC.EVAL-LTC7890-AZ features the LTC®7890: a low quiescent current high frequency (programmable fixed frequency from 100kHz up to 3MHz) dual step-down DC/DC synchronous controller, with a dedicated driver feature for GaN FETs housed in a small 6mm × 6mm QFN package.
Features
- 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
Typical applications
- Cabin Experience and Infotainment Solutions; Rear Seat Entertainment and Cluster Display Solutions
- Data Center Solutions ; Server Equipment
- Industrial power systems
- Medical Systems
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC max.(mΩ) | fres(MHz) | Wire Type | Ti | Ø OD(mm) | Ø ID(mm) | Packaging | Qty. | Pins | Type | Mount | L(mm) | H(mm) | IR(A) | Working Voltage(V (AC)) | Operating Temperature | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-HCF SMT High Current Inductor, 2 µH, 50.3 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCF SMT High Current Inductor | Inductance2 µH | Performance Rated Current50.3 A | Saturation Current @ 10%25.5 A | Saturation Current @ 30%30 A | DC Resistance0.92 mΩ | Self Resonant Frequency30 MHz | Wire TypeFlat | – | – | – | – | – | – | – | MountSMT | Length19.8 mm | Height10 mm | Rated Current50.3 A | – | Operating Temperature -40 °C up to +125 °C | ||||
 | WA-SMSI SMT Steel Spacer with internal Thread M2, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWA-SMSI SMT Steel Spacer with internal Thread M2 | – | – | – | – | – | – | – | Inner ThreadM2 | Outer Diameter4.35 mm | Inner Diameter2.8 mm | PackagingTape and Reel | Packaging Unit1500 | – | – | – | Length1 mm | – | – | – | Operating Temperature -55 °C up to +150 °C | |||
 | WR-PHD Jumper, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Jumper | – | – | – | – | – | – | – | – | – | – | PackagingBag | Packaging Unit1000 | Pins2 | – | – | – | – | Rated Current3 A | Working Voltage200 V (AC) | Operating Temperature -25 °C up to +105 °C | |||
 | WR-PHD Pin Header, –, – | Simulation– | Downloads7 files | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | – | – | – | – | – | – | – | PackagingBag | Packaging Unit1000 | Pins6 | TypeStraight | MountTHT | Length6 mm | – | Rated Current2 A | Working Voltage200 V (AC) | Operating Temperature -40 °C up to +105 °C |