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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Technical Articles Page
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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
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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 | LT8491 | 1 | 6 | 80 | 10 | 1.3 | 80 | High Voltage Buck-Boost Battery Charge Controller with Maximum Power Point Tracking (MPPT) and I2C | $10.35 (LT8491EUKJ#PBF) |
| 2 | 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) |
| 3 | 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) |
| 4 | 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) |
| 5 | 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) |
| 6 | LTC3779 | 1 | 4.5 | 150 | 10 | 1.2 | 150 | 150V VIN and VOUT Synchronous 4-Switch Buck-Boost Controller | $5.95 (LTC3779EFE#PBF) |
| 7 | LT8711 | 1 | 4.5 | 42 | 10 | 800m | 42 | Micropower Synchronous Multitopology Controller with 42V Input Capability | $2.30 (LT8711EUDC#PBF) |
| 8 | LT8390A | 1 | 4 | 60 | 10 | 1 | 60 | 60V 2MHz Synchronous 4-Switch Buck-Boost Controller with Spread Spectrum | $4.65 (LT8390AEFE#PBF) |
| 9 | LTC7813 | 2 | 2.2 | 60 | 20 | 800m | 60 | Low IQ, 60V Synchronous Boost+Buck Controller | $4.82 (LTC7813EUH#PBF) |
| 10 | 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) |
| 11 | LT8390 | 1 | 4 | 60 | 25 | 1 | 60 | 60V Synchronous 4-Switch Buck-Boost Controller with Spread Spectrum | $4.65 (LT8390EFE#PBF) |
| 12 | LTC7812 | 2 | 2.5 | 38 | 20 | 800m | 60 | Low IQ, 38V Synchronous Boost+Buck Controller | $4.00 (LTC7812EUH#PBF) |
| 13 | LT3790 | 1 | 4.7 | 60 | 10 | 1.2 | 60 | 60V Synchronous 4-Switch Buck-Boost Controller | $4.75 (LT3790EFE#PBF) |
| 14 | LT8490 | 1 | 6 | 80 | 10 | - | - | High Voltage, High Current Buck-Boost Battery Charge Controller with Maximum Power Point Tracking (M | $10.35 (LT8490EUKJ#PBF) |
| 15 | 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) |
| 16 | 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) |
| 17 | LTC3789 | 1 | 4 | 38 | 10 | 800m | 38 | High Efficiency, Synchronous, 4-Switch Buck-Boost Controller | $4.65 (LTC3789EGN#PBF) |
| 18 | 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) |
| 19 | LTC3785 | 1 | 2.7 | 10 | 10 | 2.7 | 10 | 10A Sync Buck-Boost, LTC3785 No Power Good | $3.56 (LTC3785EUF#PBF) |
| 20 | 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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