LTC3374A - High Accuracy 8-Channel Parallelable 1A Buck DC/DCs
Features
- 8-Channel 1A Independent Step-Down DC/DCs
- Master-Slave Configurable for Up to 4A of Output Current with a Single Inductor
- Independent VIN Supplies for Each DC/DC (2.25V to 5.5V)
- All DC/DCs Have 0.8V to VIN Output Range
- ±1% VFB Accuracy, for Buck 1 (1A to 4A)
- ±1% PGOOD Accuracy
- Precision Enable Pin Thresholds for Autonomous Sequencing
- 1MHz to 3MHz Programmable/Synchronizable Oscillator Frequency (2MHz Default)
- Die Temperature Monitor Output
- Thermally Enhanced 38-Lead 5mm × 7mm QFN and TSSOP Packages
- Pin-Compatible with LTC3374
Typical Application
Description
The LTC3374A is a multioutput power supply IC consisting of eight synchronous 1A buck converters, all powered from independent 2.25V to 5.5V input supplies. An upgraded pin-compatible version of the LTC3374, the LTC3374A, has higher efficiency, improved output voltage accuracy and an added overvoltage (OV) indicator.
The DC/DCs may be used independently or in parallel to achieve higher output currents of up to 4A with a shared inductor. The common buck switching frequency may be programmed with an external resistor, synchronized to an external oscillator, or set to a default internal 2MHz clock. The operating mode for all DC/DCs may be programmed via the MODE pin.
To reduce input noise the buck converters are phased in 90° steps. Precision enable pin thresholds simplify powerup sequencing. The LTC3374A is available in a 38-lead 5mm × 7mm QFN package as well as a 38-lead exposed pad TSSOP package.
| NOTES | |
| LTC3374 | |
| LTC3374A | Higher efficiency, improved output voltage accuracy and an added overvoltage (OV) indicator |
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 |
|---|---|---|---|---|---|
| LTC3374AEFE#PBF | TSSOP-38 | FE | E | 05-08-1772 | Yes |
| LTC3374AEFE#TRPBF | TSSOP-38 | FE | E | 05-08-1772 | Yes |
| LTC3374AEUHF#PBF | 5x7 QFN-38 | UHF | E | 05-08-1701 | Yes |
| LTC3374AEUHF#TRPBF | 5x7 QFN-38 | UHF | E | 05-08-1701 | Yes |
| LTC3374AHFE#PBF | TSSOP-38 | FE | H | 05-08-1772 | Yes |
| LTC3374AHFE#TRPBF | TSSOP-38 | FE | H | 05-08-1772 | Yes |
| LTC3374AHUHF#PBF | 5x7 QFN-38 | UHF | H | 05-08-1701 | Yes |
| LTC3374AHUHF#TRPBF | 5x7 QFN-38 | UHF | H | 05-08-1701 | Yes |
| LTC3374AIFE#PBF | TSSOP-38 | FE | I | 05-08-1772 | Yes |
| LTC3374AIFE#TRPBF | TSSOP-38 | FE | I | 05-08-1772 | Yes |
| LTC3374AIUHF#PBF | 5x7 QFN-38 | UHF | I | 05-08-1701 | Yes |
| LTC3374AIUHF#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 | |
|---|---|---|---|---|---|---|
| LTC3374AEFE#PBF | TSSOP-38 | E | $6.79 | $4.75 | Yes | |
| LTC3374AEFE#TRPBF | TSSOP-38 | E | $6.85 | $4.81 | Yes | |
| LTC3374AEUHF#PBF | 5x7 QFN-38 | E | $6.64 | $4.65 | Yes | |
| LTC3374AEUHF#TRPBF | 5x7 QFN-38 | E | $6.70 | $4.71 | Yes | |
| LTC3374AHFE#PBF | TSSOP-38 | H | $7.93 | $5.55 | Yes | |
| LTC3374AHFE#TRPBF | TSSOP-38 | H | $7.99 | $5.61 | Yes | |
| LTC3374AHUHF#PBF | 5x7 QFN-38 | H | $8.00 | $5.60 | Yes | |
| LTC3374AHUHF#TRPBF | 5x7 QFN-38 | H | $8.06 | $5.66 | Yes | |
| LTC3374AIFE#PBF | TSSOP-38 | I | $7.43 | $5.20 | Yes | |
| LTC3374AIFE#TRPBF | TSSOP-38 | I | $7.49 | $5.26 | Yes | |
| LTC3374AIUHF#PBF | 5x7 QFN-38 | I | $7.64 | $5.35 | Yes | |
| LTC3374AIUHF#TRPBF | 5x7 QFN-38 | I | $7.70 | $5.41 | 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 |
|---|---|---|---|
| DC2440A | LTC3374AEUHF Demo Board | High Accuracy 8-Ch Parallelable 1A Sync Bucks; 2.25V ≤ VIN ≤ 5.5V, Vout1-Vout8 = 1V to 3.3V @ 1A | Contact Factory | |
| Buy Now | |||
Applications
- General Purpose Multichannel Power Supplies
- Industrial/Automotive/Communications
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Design Tools
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LTC3374
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.
