LT8471 - Dual Multitopology DC/DC Converters with 2A Switches and Synchronization
Features
- Dual 2A and One 500mA, 50V Internal Power Switch Channels
- 2A Primary Channels Can Be Buck, Boost, SEPIC, ZETA, Flyback or Inverting DC/DC Converter
- 500mA Skyhook Channel Efficiently Generates Boosted Input Voltage
- Wide Input Voltage Range of 2.6V to 50V
- UVLO and OVLO Programmable on OV/UV Pin
- Soft-Start Programmable for Each Channel
- Fixed Frequency PWM (Set by RT Pin or Synchronized to External Clock)
- Anti-Phase Switching Reduces Input Ripple
- 20-Lead TSSOP and 28-Lead QFN Packages
Typical Application
Description
The LT®8471 is a dual PWM DC/DC converter containing two internal 2A, 50V switches and an additional 500mA switch to facilitate step-down and inverting conversion. Each 2A channel can be independently configured as a buck, boost, SEPIC, flyback or inverting converter. Capable of generating positive and negative outputs from a single input rail, the LT8471 is ideal for many local power supply designs.
The LT8471 has an adjustable oscillator, set by a resistor placed from the RT pin to ground. Additionally, the LT8471 can be synchronized to an external clock. The free running or synchronized switching frequency range of the part can be set between 100kHz and 2MHz.
Additional features such as frequency foldback, soft-start, and power good are integrated. The LT8471 is available in 20-lead TSSOP and 28-Lead (4mm × 5mm) QFN packages.
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 |
|---|---|---|---|---|---|
| LT8471EFE#PBF | TSSOP-20 | FE | E | 05-08-1663 (CB) | Yes |
| LT8471EFE#TRPBF | TSSOP-20 | FE | E | 05-08-1663 (CB) | Yes |
| LT8471EUFD#PBF | 4x5 QFN-28 | UFD | E | 05-08-1712 | Yes |
| LT8471EUFD#TRPBF | 4x5 QFN-28 | UFD | E | 05-08-1712 | Yes |
| LT8471HFE#PBF | TSSOP-20 | FE | H | 05-08-1663 (CB) | Yes |
| LT8471HFE#TRPBF | TSSOP-20 | FE | H | 05-08-1663 (CB) | Yes |
| LT8471IFE#PBF | TSSOP-20 | FE | I | 05-08-1663 (CB) | Yes |
| LT8471IFE#TRPBF | TSSOP-20 | FE | I | 05-08-1663 (CB) | Yes |
| LT8471IUFD#PBF | 4x5 QFN-28 | UFD | I | 05-08-1712 | Yes |
| LT8471IUFD#TRPBF | 4x5 QFN-28 | UFD | I | 05-08-1712 | 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 | |
|---|---|---|---|---|---|---|
| LT8471EFE#PBF | TSSOP-20 | E | $5.36 | $3.75 | Yes | |
| LT8471EFE#TRPBF | TSSOP-20 | E | $3.81 | Yes | ||
| LT8471EUFD#PBF | 4x5 QFN-28 | E | $5.36 | $3.75 | Yes | |
| LT8471EUFD#TRPBF | 4x5 QFN-28 | E | $3.81 | Yes | ||
| LT8471HFE#PBF | TSSOP-20 | H | $6.26 | $4.38 | Yes | |
| LT8471HFE#TRPBF | TSSOP-20 | H | $4.44 | Yes | ||
| LT8471IFE#PBF | TSSOP-20 | I | $5.90 | $4.13 | Yes | |
| LT8471IFE#TRPBF | TSSOP-20 | I | $4.19 | Yes | ||
| LT8471IUFD#PBF | 4x5 QFN-28 | I | $5.90 | $4.13 | Yes | |
| LT8471IUFD#TRPBF | 4x5 QFN-28 | I | $4.19 | 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 |
|---|---|---|---|
| DC1854A | LT8471EFE Demo Board | Dual Buck/Inverting, 6V ≤ VIN ≤ 32V, Vout1 = 5V @ 1.4A, Vout2 = -5V @ 0.8A | $150.00 | |
| Buy Now | |||
Applications
- Dual Rail Power for Signal Chain.
- Buck/Buck, Buck/Boost, Boost/Boost, Boost/Invert, Invert/Invert, Buck/Invert
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Design Tools
LTspice
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LT8471
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.
