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Analog Devices LT8551 | Demoboard DC2332A
Multiphase Boost Converter Expander with Internal Gate Drivers
Overview
| Topology | Boost Converter |
| Input voltage | 12-46 V |
| Switching frequency | 100-1000 kHz |
| Output 1 | 48 V / 25 A |
Description
The LT8551 is a multiphase expander for synchronous boost DC/DC converters. It operates in tandem with any synchronous boost DC/DC converter to increase the load current capability by adding additional phases, which are clocked out-of-phase to reduce ripple current and filtering capacitance. It easily adds phases without the need to route sensitive feedback and control signals.The LT8551 integrates 5V gate drivers and can support up to four boost phases per device. Multiple LT8551 devices can be used for up to 18 phases. It accurately monitors and adjusts the current of each channel to achieve excellent DC and transient current sharing. The LT8551 operates over a fixed frequency from 100kHz to 1MHz or can be synchronized to an external clock.
Features
- Expands Up to 4 Phases per Chip
- Up to 80V Input or Output Voltage
- Cascade with Multiple Chips for 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
- High Current Distributed Power Systems, Telecom, Datacom, and Storage Systems
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | f(mm) | L(µH) | IRP,40K(A) | RDC max.(mΩ) | fres(MHz) | Size | Version | Pins | Type | Mount | L(mm) | H(mm) | IR(A) | Working Voltage(V (AC)) | Operating Temperature | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-PD SMT Power Inductor, –, 22 µH | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | – | Inductance22 µH | Performance Rated Current2.45 A | DC Resistance110 mΩ | Self Resonant Frequency17 MHz | Size7345 | VersionRobust | Pins2 | – | MountSMT | Length7.3 mm | Height4.5 mm | Rated Current1.41 A | – | Operating Temperature -40 °C up to +125 °C | ||||
 | 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 | |||
 | 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 |