LTC3425 - 5A, 8MHz, 4-Phase Synchronous Step-Up DC/DC Converter
Features
- High Efficiency: Up to 95%
- Up to 3A Continuous Output Current
- 4-Phase Operation for Low Output Ripple and Tiny Solution Size
- Output Disconnect and Inrush Current Limiting
- Very Low Quiescent Current: 12µA
- 0.5V to 4.5V Input Range
- 2.4V to 5.25V Adjustable Output Voltage
- Adjustable Current Limit
- Adjustable, Fixed Frequency Operation from 100kHz to 2MHz per Phase
- Synchronizable Oscillator with Sync Output
- Internal Synchronous Rectifiers
- Manual or Automatic Burst Mode® Operation
- Power Good Comparator
- <1µA Shutdown Current
- Antiringing Control
- 5mm x 5mm Thermally Enhanced QFN Package
Typical Application
Description
The LTC3425 is a synchronous, 4-phase boost converter with output disconnect capable of operation below 1V input. It includes four N-channel MOSFET switches and four P-channel synchronous rectifiers for an effective RDS(ON) of 0.045 Ohm and 0.05 Ohm, respectively. 4-phase operation greatly reduces peak inductor currents, and capacitor ripple current, and increases effective switching frequency, minimizing inductor and capacitor sizes. True output disconnect eliminates inrush current and allows zero load current in shutdown. External Schottky diodes are not required in most applications (VOUT < 4.3V). Power saving Burst Mode operation can be user controlled or left in automatic mode.
Other features include 1µA shutdown current, programmable frequency with sync in and out, programmable soft-start, antiringing control, thermal shutdown, adjustable current limit, reference output and power good comparator.
The LTC3425 is available in a small, thermally enhanced 32-pin QFN package.
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 |
|---|---|---|---|---|---|
| LTC3425EUH#PBF | 5x5 QFN-32 | UH | E | 05-08-1693 | Yes |
| LTC3425EUH#TRPBF | 5x5 QFN-32 | UH | E | 05-08-1693 | 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 | |
|---|---|---|---|---|---|---|
| LTC3425EUH#PBF | 5x5 QFN-32 | E | $6.25 | $4.38 | Yes | |
| LTC3425EUH#TRPBF | 5x5 QFN-32 | E | $4.48 | 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 |
|---|---|---|---|
| DC616A | LTC3425EUH | 4MHz, Polyphase, 2V to 3Vin, 2 Circuits, 3.3Vout1 @ 2.25A, 3.3Vout2 @ 1.8A | $150.00 | |
| DC616B | LTC3425EUH | 4MHz, Polyphase, 2V to 3Vin, 2 Circuits, 5Vout1 @ 2A, 5Vout2 @ 1.5A | $150.00 | |
| Buy Now | |||
Applications
- Handheld Computers
- Point-of-Load Regulators
- 3.3V to 5V Conversion
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Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LTC3425
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.
