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Analog Devices LT8550 | Demoboard DC2331A-A
4-Phase DC/DC Expander with Internal Gate Drivers for Buck Converters
Overview
| Topology | Buck Converter |
| Input voltage | 14-56 V |
| Output 1 | 12 V / 70 A |
Description
Demonstration circuit 2331A-A/2331A-B is a 4-phaseDC/DC expander with internal gate drivers for buck converters that features the LT®8550. The demonstration circuit expands (increases) the number of power sections for a LT3763 60V step-down controller to provide higher output power. The increased number of power sections allowed by the LT8550 results in more available output power without a corresponding increase in the difficulty of the design or a sacrifice of LT3763 features. The demo board uses the multi-chip (master-slave) feature of the LT8550 so the total number of power sections can be increased in four power section increments:• DC2331A-A has one power section for the LT3763 primary controller and an additional four power sectionsfor its LT8550 which is configured as a master• DC2331A-B does not have a primary controller, andits LT8550 is configured as a slave with four powersections
Features
- Expands Up to Four Phases per Chip
- Up to 80V Input or Output Voltage
- Cascade with Multiple Chips for Very High Current Applications
- Supports Up to 18 Distinct Phases from 20° to 180°
- Phases Can Share Phase Angle
- Excellent DC and Transient Current Sharing
- Phase-Lockable Fixed Frequency 125kHz to 1MHz
- Supports Bidirectional Current Flow
- RSENSE or DCR Current Sensing
- Eliminates the Need to Route Sensitive Feedback and Control Signals
- 52-Lead (7mm × 8mm) QFN Package
Typical applications
- Industrial and Automotive
- Telecom, Datacom, and Storage Systems
- High Current Distributed Power Systems
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | f(mm) | L(µH) | IRP,40K(A) | ISAT(A) | RDC max.(mΩ) | fres(MHz) | Size | Version | Pins | Type | Mount | L(mm) | H(mm) | IR(A) | Working Voltage(V (AC)) | Operating Temperature | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WA-SNSR Self-Retaining Spacer, 4.8 mm, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWA-SNSR Self-Retaining Spacer | Drilling in Panel4.8 mm | – | – | – | – | – | – | – | – | – | – | Length25.4 mm | – | – | – | Operating Temperature -30 °C up to +85 °C | |||
 | WE-PD SMT Power Inductor, –, 47 µH | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | – | Inductance47 µH | Performance Rated Current4.1 A | Saturation Current2.6 A | DC Resistance77 mΩ | Self Resonant Frequency9.2 MHz | Size1260 | VersionStandard | Pins2 | – | MountSMT | Length12 mm | Height6 mm | Rated Current2.4 A | – | Operating Temperature -40 °C up to +125 °C | ||||
 | WR-PHD Jumper, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Jumper | – | – | – | – | – | – | – | – | Pins2 | – | – | – | – | Rated Current3 A | Working Voltage200 V (AC) | Operating Temperature -25 °C up to +105 °C | |||
 | WR-PHD Pin Header, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | – | – | – | – | – | Pins3 | TypeStraight | MountTHT | Length6 mm | – | Rated Current2 A | Working Voltage200 V (AC) | Operating Temperature -40 °C up to +105 °C | |||
 | WR-PHD Pin Header, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | – | – | – | – | – | Pins4 | TypeStraight | MountTHT | Length8 mm | – | Rated Current2 A | Working Voltage200 V (AC) | Operating Temperature -40 °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 | – | – | – | – | – | – | – | – | Pins8 | TypeStraight | MountTHT | Length8 mm | – | Rated Current2 A | Working Voltage200 V (AC) | Operating Temperature -40 °C up to +105 °C |