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Overview
| Topology | Buck Converter |
| Input voltage | 8-75 V |
| Switching frequency | 100-3000 kHz |
| Output 1 | 3.3 V / 12 A |
| Output 2 | 5 V / 12 A |
Description
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.
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 highside 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
- medical systems
- Telecommunications power systems
- Industrial power 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) | Material | LR(µH) | fres(MHz) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-HCC SMT High Current Cube Inductor, 1 µH, 27.2 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCC SMT High Current Cube Inductor | Inductance1 µH | Performance Rated Current27.2 A | Saturation Current @ 10%26.5 A | Saturation Current @ 30%31.1 A | DC Resistance2.65 mΩ | MaterialFerrite | Rated Inductance0.95 µH | Self Resonant Frequency100 MHz | ||||
 | WE-HCC SMT High Current Cube Inductor, 1.5 µH, 25.7 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCC SMT High Current Cube Inductor | Inductance1.5 µH | Performance Rated Current25.7 A | Saturation Current @ 10%26.5 A | Saturation Current @ 30%29.1 A | DC Resistance3.5 mΩ | MaterialFerrite | Rated Inductance1.43 µH | Self Resonant Frequency92 MHz |