External Power Switch Buck-Boost Controllers
Analog Devices' buck/boost synchronous dc-to-dc controllers utilize an external power switch to deliver high currents with excellent efficiency. With their unique external four MOSFET buck-boost 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. They are particularly well suited to automotive applications where the input voltage can vary dramatically during stop/start, cold crank and load dump scenarios.
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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
Technical Articles Page
- 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
- 60V Synchronous, Low EMI Buck-Boost for High Power and High Efficiency
- How NOT to Damage Your Switching Regulator Demo Board
- LT3790 240W High Efficiency Parallel Buck-Boost Regulator
External Power Switch Buck-Boost Controllers
| 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 | LT8392 | 1 | 3 | 60 | 10 | 1 | 60 | 60V Synchronous 4-Switch Buck-Boost Controller with Spread Spectrum | $4.65 (LT8392EFE#PBF) |
| 2 | LT8253A | 1 | 4 | 40 | 5 | 1 | 25 | 60V Synchronous 4-Switch Buck-Boost Controller with Spread Spectrum | - |
| 3 | LT8253 | 1 | 4 | 40 | 5 | 1 | 25 | 60V Synchronous 4-Switch Buck-Boost Controller with Spread Spectrum | - |
| 4 | LT8210 | 1 | 2.8 | 100 | 25 | 1 | 100 | 100V VIN and VOUT Synchronous 4-Switch Buck‑Boost DC/DC Controller with Pass-Through | $5.95 (LT8210EFE#PBF) |
| 5 | LT8708-1 | 1 | 2.8 | 80 | 15 | 1.3 | 80 | 80V Synchronous 4-Switch Buck-Boost DC/DC Controller with Flexible Bidirectional Capability | $6.60 (LT8708EUHG-1#PBF) |
| 6 | 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) |
| 7 | 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) |
| 8 | LTC3779 | 1 | 4.5 | 150 | 10 | 1.2 | 150 | 150V VIN and VOUT Synchronous 4-Switch Buck-Boost Controller | $5.95 (LTC3779EFE#PBF) |
| 9 | LT8711 | 1 | 4.5 | 42 | 10 | 800m | 42 | Micropower Synchronous Multitopology Controller with 42V Input Capability | $2.30 (LT8711EUDC#PBF) |
| 10 | LT8390A | 1 | 4 | 60 | 10 | 1 | 60 | 60V 2MHz Synchronous 4-Switch Buck-Boost Controller with Spread Spectrum | $4.65 (LT8390AEFE#PBF) |
| 11 | LTC7813 | 2 | 2.2 | 60 | 20 | 800m | 60 | Low IQ, 60V Synchronous Boost+Buck Controller | $4.82 (LTC7813EUH#PBF) |
| 12 | LT8705A | 1 | 2.8 | 80 | 10 | 1.3 | 80 | 80V VIN and VOUT Synch Buck- Boost, Pin-To-Pin Improved LT8705 | $5.95 (LT8705AEFE#PBF) |
| 13 | LT8390 | 1 | 4 | 60 | 25 | 1 | 60 | 60V Synchronous 4-Switch Buck-Boost Controller with Spread Spectrum | $4.65 (LT8390EFE#PBF) |
| 14 | LTC7812 | 2 | 2.5 | 38 | 20 | 800m | 60 | Low IQ, 38V Synchronous Boost+Buck Controller | $4.00 (LTC7812EUH#PBF) |
| 15 | LT3790 | 1 | 4.7 | 60 | 10 | 1.2 | 60 | 60V Synchronous 4-Switch Buck-Boost Controller | $4.75 (LT3790EFE#PBF) |
| 16 | LT8705 | 1 | 2.8 | 80 | 10 | 1.3 | 80 | 80V VIN and VOUT Synchronous 4-Switch Buck- Boost DC/DC Controller | $5.95 (LT8705EFE#PBF) |
| 17 | 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) |
| 18 | LTC3789 | 1 | 4 | 38 | 10 | 800m | 38 | High Efficiency, Synchronous, 4-Switch Buck-Boost Controller | $4.65 (LTC3789EGN#PBF) |
| 19 | 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) |
| 20 | LTC3785 | 1 | 2.7 | 10 | 10 | 2.7 | 10 | 10A Sync Buck-Boost, LTC3785 No Power Good | $3.56 (LTC3785EUF#PBF) |
| 21 | 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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