External Power Switch Buck-Boost
Analog Devices offers true buck/boost synchronous dc-to-dc converters. With their unique internal four MOSFET switch combination, they can seamlessly transition from step-down mode, through 100% dropout operation, and then to step-up mode to allow a fixed output voltage even when the input voltage fluctuates above or below the output.
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Latest Resources
LT Journal
- Hundreds of Watts, 60V In or Out: Synchronous 4-Switch Buck-Boost Converter is Easy to Parallel to Minimize Temperature Rise PDF
- 60V, 4-Switch Synchronous Buck-Boost Controller Regulates Voltage from Wide Ranging Inputs and Charges Batteries at 98.5% Efficiency at 100W+ PDF
- Sep 2005 Breakthrough Buck-Boost Controller Provides up to 10A from a Wide 4V-36V Input Range PDF
- Oct 2007 - Single-IC Converter Operates Buck and Boost to Provide an Output that is Within the Input Voltage Range PDF
- 80V Buck-Boost Lead-Acid and Lithium Battery Charging Controller Actively Finds True Maximum Power Point in Solar Power Applications
- 60V Synchronous, Low EMI Buck-Boost for High Power and High Efficiency
Technical Articles
- LT3790 240W High Efficiency Parallel Buck-Boost Regulator
- 80V Synchronous 4-Switch Buck-Boost Controller Delivers Hundreds of Watts with 99% Efficiency
- LTC3779EFE Demo Board | 16V ≤ VIN ≤ 120V, VOUT = 48V @ 10A at up to 99% Efficiency
- 60V 2MHz Buck-Boost Controllers Regulate High Power Voltage and Current with High Efficiency and Low EMI
- How NOT to Damage Your Switching Regulator Demo Board
Videos
Design Notes
- DN567 - 60V 2MHz Buck-Boost Controllers Regulate High Power Voltage and Current with High Efficiency and Low EMI PDF
- DN424 - Buck-Boost Controller Simplifies Design of DC/DC Converters for Handheld Products PDF
- DN369 - Industry's First 4-Switch Buck-Boost Controller Achieves Highest Efficiency Using a Single Inductor PDF
- DN521 - 80V Synchronous 4-Switch Buck-Boost Controller Delivers Hundreds of Watts with 99% Efficiency PDF
- DN499 - High Efficiency 4-Switch Buck-Boost Controller Provides Accurate Output Current Limit PDF
External Power Switch Buck-Boost
| SortOrder | Part# | Number of Outputs | Vin (min) (V) | Vin (max) (V) | Output Current (typ) (A) | Vout Min (typ) (V) | Vout Max (typ) (V) | Comments | Price (1000+) ($ US) |
|---|---|---|---|---|---|---|---|---|---|
| 1 | LT8708-1 | 1 | 2.8 | 80 | 15 | 1.3 | 80 | 80V Synchronous 4-Switch Buck-Boost DC/DC Slave Controller for LT8708 | $6.60 (LT8708EUHG-1#PBF) |
| 2 | LT8708 | 1 | 2.8 | 80 | 15 | 1.3 | 80 | 80V Synchronous 4-Switch Buck-Boost DC/DC Controller with Flexible Bidirectional Capability | $6.60 (LT8708EUHG#PBF) |
| 3 | LTC3777 | 1 | 4.5 | 150 | 10 | 1.2 | 150 | 150V VIN and VOUT Synchronous 4-Switch Buck-Boost Controller + Switching Bias Supply | $8.40 (LTC3777ELXE#PBF) |
| 4 | LTC3779 | 1 | 4.5 | 150 | 10 | 1.2 | 150 | 150V VIN and VOUT Synchronous 4-Switch Buck-Boost Controller | $5.95 (LTC3779EFE#PBF) |
| 5 | LT8711 | 1 | 4.5 | 42 | - | 800m | 42 | Micropower Synchronous Multitopology Controller with 42V Input Capability | $2.30 (LT8711EUDC#PBF) |
| 6 | LT8390A | 1 | 4 | 60 | 10 | 1 | 60 | 60V 2MHz Synchronous 4-Switch Buck-Boost Controller with Spread Spectrum | $4.65 (LT8390AEFE#PBF) |
| 7 | LTC7813 | 2 | 2.2 | 60 | 20 | 800m | 60 | Low IQ, 60V Synchronous Boost+Buck Controller | $4.82 (LTC7813EUH#PBF) |
| 8 | LT8705A | 1 | 2.8 | 80 | 10 | 1.3 | 80 | 80V VIN and VOUT Synchronous 4-Switch Buck- Boost DC/DC Controller | $5.95 (LT8705AEFE#PBF) |
| 9 | LT8390 | 1 | 4 | 60 | 25 | 1 | 60 | 60V Synchronous 4-Switch Buck-Boost Controller with Spread Spectrum | $4.65 (LT8390EFE#PBF) |
| 10 | LTC7812 | 2 | 2.5 | 38 | 20 | 800m | 60 | Low IQ, 38V Synchronous Boost+Buck Controller | $4.00 (LTC7812EUH#PBF) |
| 11 | LT3790 | 1 | 4.7 | 60 | 10 | 1.2 | 60 | 60V Synchronous 4-Switch Buck-Boost Controller | $4.75 (LT3790EFE#PBF) |
| 12 | LT8490 | 1 | 6 | 80 | 10 | - | - | High Voltage, High Current Buck-Boost Battery Charge Controller with Maximum Power Point Tracking (M | $10.35 (LT8490EUKJ#PBF) |
| 13 | LT8705 | 1 | 2.8 | 80 | 10 | 1.3 | 80 | 80V VIN and VOUT Synch Buck- Boost, Pin-To-Pin Improved LT8705 | $5.95 (LT8705EFE#PBF) |
| 14 | LT3791-1 | 1 | 4.7 | 60 | 10 | 1.2 | 60 | 60V 4-Switch Synchronous Buck-Boost Controller, C/10 Termination Flag | $4.75 (LT3791EFE-1#PBF) |
| 15 | LTC3789 | 1 | 4 | 38 | 10 | 800m | 38 | High Efficiency, Synchronous, 4-Switch Buck-Boost Controller | $4.65 (LTC3789EGN#PBF) |
| 16 | LTC3785-1 | 1 | 2.7 | 10 | 10 | 2.7 | 10 | 10V, High Efficiency Buck-Boost Controller - LTC3785-1 Offers Power Good | $3.75 (LTC3785EUF-1#PBF) |
| 17 | LTC3785 | 1 | 2.7 | 10 | 10 | 2.7 | 10 | 10A Sync Buck-Boost, LTC3785 No Power Good | $3.56 (LTC3785EUF#PBF) |
| 18 | LTC3780 | 1 | 4 | 36 | 10 | 800m | 30 | Buck-boost controller, constant frequency, current mode control with power good | $4.65 (LTC3780EG#PBF) |
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