LTC3899 - 60V Low IQ, Triple Output, Buck/Buck/Boost Synchronous Controller
Features
- Dual Buck Plus Single Boost Synchronous Controllers
- Wide Bias Input Voltage Range: 4.5V to 60V
- Outputs Remain in Regulation Through Cold Crank Down to a 2.2V Input Supply Voltage
- Buck and Boost Output Voltages Up to 60V
- Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE)
- No External Bootstrap Diodes Required
- Low Operating IQ: 29μA (One Channel On)
- 100% Duty Cycle for Boost Synchronous MOSFET
- Phase-Lockable Frequency (75kHz to 850kHz)
- Programmable Fixed Frequency (50kHz to 900kHz)
- Very Low Dropout Operation: 99% Duty Cycle (Bucks)
- Low Shutdown IQ: 3.6μA
- Fixed or Adjustable Boost Output Voltage Saves IQ
- Small 38-Lead 5mm × 7mm QFN and TSSOP Packages
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC®3899 is a high performance triple output (buck/ buck/boost) DC/DC switching regulator controller that drives all N-channel synchronous power MOSFET stages. The constant frequency current mode architecture allows a phase-lockable frequency of up to 850kHz. The LTC3899 operates from a wide 4.5V to 60V input supply range. When biased from the output of the boost converter or another auxiliary supply, the LTC3899 can operate from an input supply as low as 2.2V after start-up.
The gate drive for the LTC3899 can be programmed from 5V to 10V to allow the use of logic-level or standard-level FETs and to maximize efficiency. Internal switches in the top gate drivers eliminate the need for external bootstrap diodes. The 29μA no-load quiescent current extends operating run time in battery-powered systems. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC3899EFE#PBF | TSSOP-38 | FE | E | 05-08-1772 | Yes |
| LTC3899EFE#TRPBF | TSSOP-38 | FE | E | 05-08-1772 | Yes |
| LTC3899EUHF#PBF | 5x7 QFN-38 | UHF | E | 05-08-1701 | Yes |
| LTC3899EUHF#TRPBF | 5x7 QFN-38 | UHF | E | 05-08-1701 | Yes |
| LTC3899HFE#PBF | TSSOP-38 | FE | H | 05-08-1772 | Yes |
| LTC3899HFE#TRPBF | TSSOP-38 | FE | H | 05-08-1772 | Yes |
| LTC3899HUHF#PBF | 5x7 QFN-38 | UHF | H | 05-08-1701 | Yes |
| LTC3899HUHF#TRPBF | 5x7 QFN-38 | UHF | H | 05-08-1701 | Yes |
| LTC3899IFE#PBF | TSSOP-38 | FE | I | 05-08-1772 | Yes |
| LTC3899IFE#TRPBF | TSSOP-38 | FE | I | 05-08-1772 | Yes |
| LTC3899IUHF#PBF | 5x7 QFN-38 | UHF | I | 05-08-1701 | Yes |
| LTC3899IUHF#TRPBF | 5x7 QFN-38 | UHF | I | 05-08-1701 | Yes |
| LTC3899MPFE#PBF | TSSOP-38 | FE | MP | 05-08-1772 | Yes |
| LTC3899MPFE#TRPBF | TSSOP-38 | FE | MP | 05-08-1772 | Yes |
| LTC3899MPUHF#PBF | 5x7 QFN-38 | UHF | MP | 05-08-1701 | Yes |
| LTC3899MPUHF#TRPBF | 5x7 QFN-38 | UHF | MP | 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 | |
|---|---|---|---|---|---|---|
| LTC3899EFE#PBF | TSSOP-38 | E | $7.31 | $5.12 | Yes | |
| LTC3899EFE#TRPBF | TSSOP-38 | E | $5.18 | Yes | ||
| LTC3899EUHF#PBF | 5x7 QFN-38 | E | $7.07 | $4.95 | Yes | |
| LTC3899EUHF#TRPBF | 5x7 QFN-38 | E | $5.01 | Yes | ||
| LTC3899HFE#PBF | TSSOP-38 | H | $8.49 | $5.94 | Yes | |
| LTC3899HFE#TRPBF | TSSOP-38 | H | $6.00 | Yes | ||
| LTC3899HUHF#PBF | 5x7 QFN-38 | H | $8.23 | $5.76 | Yes | |
| LTC3899HUHF#TRPBF | 5x7 QFN-38 | H | $5.82 | Yes | ||
| LTC3899IFE#PBF | TSSOP-38 | I | $8.07 | $5.65 | Yes | |
| LTC3899IFE#TRPBF | TSSOP-38 | I | $5.71 | Yes | ||
| LTC3899IUHF#PBF | 5x7 QFN-38 | I | $7.82 | $5.47 | Yes | |
| LTC3899IUHF#TRPBF | 5x7 QFN-38 | I | $5.53 | Yes | ||
| LTC3899MPFE#PBF | TSSOP-38 | MP | $21.77 | $15.24 | Yes | |
| LTC3899MPFE#TRPBF | TSSOP-38 | MP | $15.30 | Yes | ||
| LTC3899MPUHF#PBF | 5x7 QFN-38 | MP | $21.09 | $14.76 | Yes | |
| LTC3899MPUHF#TRPBF | 5x7 QFN-38 | MP | $14.82 | 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 |
|---|---|---|---|
| DC1898A | LTC3899EFE Demo Board | Triple Buck/Buck/Boost Controller, Vout3 Powers VOUT1/VOUT2; 2.5V ≤ VIN ≤ 60V; VOUT1 = 5V @ 5A, VOUT2 = 8.5V @ 3A, Vout3 = 10V @ 5.5A | $200.00 | |
| 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 | |
|---|---|---|---|---|---|---|
| LTC3899HUHF#PBF | 5x7 QFN-38 | H | $8.23 | $5.76 | Yes | |
| LTC3899HUHF#TRPBF | 5x7 QFN-38 | H | $5.82 | Yes | ||
| LTC3899IUHF#PBF | 5x7 QFN-38 | I | $7.82 | $5.47 | Yes | |
| LTC3899IUHF#TRPBF | 5x7 QFN-38 | I | $5.53 | Yes | ||
| LTC3899MPUHF#PBF | 5x7 QFN-38 | MP | $21.09 | $14.76 | Yes | |
| LTC3899MPUHF#TRPBF | 5x7 QFN-38 | MP | $14.82 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Automotive Always-On and Start-Stop Systems
- Distributed DC Power Systems
- Multioutput Buck-Boost Applications
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Design Tools
LTspice
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LTC3899
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.
