LTC3897 - PolyPhase™ Synchronous Boost Controller with Input/ Output Protection
Features
- Input Supply Range: 4.5V to 65V (Up to 75V Surge)
- Reverse Input Protection to –40V
- In-Rush Current Control, Overcurrent Protection and Output Disconnect for Boost Converter
- Input Voltage Surge Protection with Adjustable Clamp Voltage
- Onboard Ideal Diode Controller
- Low Quiescent Current: 55μA
- 2-Phase Operation Reduces Required Input and Output Capacitance and Noise
- Output Voltage Up to 60V
- Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE) for Logic-Level or Standard Threshold FETs
- No External Bootstrap Diodes Required
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC®3897 is a synchronous boost DC/DC controller with surge stopper and ideal diode controller.
The boost controller drives two N-channel power MOSFET stages out-of-phase to reduce input and output capacitor requirements, allowing the use of smaller inductors than the single-phase equivalent. Synchronous rectification reduces power loss and eases thermal requirements.
The surge stopper controls the gate of an external N-channel MOSFET to protect against high voltage input transients and provides in-rush current control, overcurrent protection and output disconnect for the boost converter. The integrated ideal diode controller drives another N-channel MOSFET to replace a Schottky diode for reverse input protection and voltage holdup or peak detection. It controls the forward voltage drop across the MOSFET and minimizes reverse current flow.
The LTC3897 is available in thermally-enhanced 38-pin leadless QFN or 38-lead TSSOP packages.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC3897EFE#PBF | TSSOP-38 | FE | E | 05-08-1772 | Yes |
| LTC3897EFE#TRPBF | TSSOP-38 | FE | E | 05-08-1772 | Yes |
| LTC3897EUHF#PBF | 5x7 QFN-38 | UHF | E | 05-08-1701 | Yes |
| LTC3897EUHF#TRPBF | 5x7 QFN-38 | UHF | E | 05-08-1701 | Yes |
| LTC3897HFE#PBF | TSSOP-38 | FE | H | 05-08-1772 | Yes |
| LTC3897HFE#TRPBF | TSSOP-38 | FE | H | 05-08-1772 | Yes |
| LTC3897HUHF#PBF | 5x7 QFN-38 | UHF | H | 05-08-1701 | Yes |
| LTC3897HUHF#TRPBF | 5x7 QFN-38 | UHF | H | 05-08-1701 | Yes |
| LTC3897IFE#PBF | TSSOP-38 | FE | I | 05-08-1772 | Yes |
| LTC3897IFE#TRPBF | TSSOP-38 | FE | I | 05-08-1772 | Yes |
| LTC3897IUHF#PBF | 5x7 QFN-38 | UHF | I | 05-08-1701 | Yes |
| LTC3897IUHF#TRPBF | 5x7 QFN-38 | UHF | I | 05-08-1701 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC3897EFE#PBF | TSSOP-38 | E | $7.86 | $5.50 | Yes | |
| LTC3897EFE#TRPBF | TSSOP-38 | E | $7.92 | $5.56 | Yes | |
| LTC3897EUHF#PBF | 5x7 QFN-38 | E | $7.86 | $5.50 | Yes | |
| LTC3897EUHF#TRPBF | 5x7 QFN-38 | E | $7.92 | $5.56 | Yes | |
| LTC3897HFE#PBF | TSSOP-38 | H | $9.36 | $6.55 | Yes | |
| LTC3897HFE#TRPBF | TSSOP-38 | H | $9.42 | $6.61 | Yes | |
| LTC3897HUHF#PBF | 5x7 QFN-38 | H | $9.36 | $6.55 | Yes | |
| LTC3897HUHF#TRPBF | 5x7 QFN-38 | H | $9.42 | $6.61 | Yes | |
| LTC3897IFE#PBF | TSSOP-38 | I | $8.86 | $6.20 | Yes | |
| LTC3897IFE#TRPBF | TSSOP-38 | I | $8.92 | $6.26 | Yes | |
| LTC3897IUHF#PBF | 5x7 QFN-38 | I | $8.86 | $6.20 | Yes | |
| LTC3897IUHF#TRPBF | 5x7 QFN-38 | I | $8.92 | $6.26 | Yes | |
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC2108A | LTC3897 Demo Board | Sync Boost Controller, 16V ≤ VIN ≤ 55V,Vout = 48V @ 4A to 12A | Contact Factory | |
| Buy Now | |||
Designed for Automotive and Transportation Applications
AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC3897EFE#PBF | TSSOP-38 | E | $7.86 | $5.50 | Yes | |
| LTC3897EFE#TRPBF | TSSOP-38 | E | $7.92 | $5.56 | Yes | |
| LTC3897EUHF#PBF | 5x7 QFN-38 | E | $7.86 | $5.50 | Yes | |
| LTC3897EUHF#TRPBF | 5x7 QFN-38 | E | $7.92 | $5.56 | Yes | |
| LTC3897HFE#PBF | TSSOP-38 | H | $9.36 | $6.55 | Yes | |
| LTC3897HFE#TRPBF | TSSOP-38 | H | $9.42 | $6.61 | Yes | |
| LTC3897HUHF#PBF | 5x7 QFN-38 | H | $9.36 | $6.55 | Yes | |
| LTC3897HUHF#TRPBF | 5x7 QFN-38 | H | $9.42 | $6.61 | Yes | |
| LTC3897IFE#PBF | TSSOP-38 | I | $8.86 | $6.20 | Yes | |
| LTC3897IFE#TRPBF | TSSOP-38 | I | $8.92 | $6.26 | Yes | |
| LTC3897IUHF#PBF | 5x7 QFN-38 | I | $8.86 | $6.20 | Yes | |
| LTC3897IUHF#TRPBF | 5x7 QFN-38 | I | $8.92 | $6.26 | Yes | |
| Buy Now • Request Samples | ||||||
Applications
- Industrial
- Automotive
- Military/Avionics
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Design Tools
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LTC3897
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
