LTC1649 - 3.3V Input High Power Step-Down Switching Regulator Controller
Features
- High Power 3.3V to 1.XV-2.XV Switching Regulator
Controller: Up to 20A Output - All N-Channel External MOSFETs
- Provides 5V MOSFET Gate Drive with 3.3V Input
- Constant Frequency Operation Minimizes
Inductor Size - Excellent Output Regulation: ±1% Over Line, Load and Temperature Variations
- High Efficiency: Over 90% Possible
- No Low-Value Sense Resistor Needed
- Available in 16-Lead SO Package
Typical Application
Description
The LTC1649 is a high power, high efficiency switching regulator controller optimized for use with very low supply voltages. It operates from 2.7V to 5V input, and provides a regulated output voltage from 1.26V to 2.5V at up to 20A load current. A typical 3.3V to 2.5V application features efficiency above 90% from 1A to 10A load. The LTC1649 uses a pair of standard 5V logic-level N-channel external MOSFETs, eliminating the need for expensive P-channel or super-low-threshold devices.The LTC1649 shares its internal switching architecture with the LTC1430, and features the same ±1% line, load and temperature regulation characteristics. Current limit is user-adjustable without requiring an external low-value sense resistor. The LTC1649 uses a 200kHz switching frequency and voltage mode control, minimizing external component count and size. Shutdown mode drops the quiescent current to below 10µA.
The LTC1649 is available in the 16-pinnarrow SO 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 |
|---|---|---|---|---|---|
| LTC1649CS#PBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1649CS#TRPBF | SO-16 | S | C | 05-08-1610 (S16) | Yes |
| LTC1649IS#PBF | SO-16 | S | I | 05-08-1610 (S16) | Yes |
| LTC1649IS#TRPBF | SO-16 | S | I | 05-08-1610 (S16) | 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 | |
|---|---|---|---|---|---|---|
| LTC1649CS#PBF | SO-16 | C | $4.45 | $4.10 | Yes | |
| LTC1649CS#TRPBF | SO-16 | C | $4.16 | Yes | ||
| LTC1649IS#PBF | SO-16 | I | $5.56 | $4.70 | Yes | |
| LTC1649IS#TRPBF | SO-16 | I | $4.76 | 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 |
|---|---|---|---|
| DC202A | LTC1649CS | LOW INPUT VOLTAGE SWITCHING REGULATOR, Vin = 3.3V VOUT = 1.8V to 2.5V @ 15A (thru-hole caps) | Contact Factory | |
| Buy Now | |||
Applications
- 3.3V Input Power Supply for Low Voltage
Microprocessors and Logic - Low Input Voltage Power Supplies
- High Power, Low Voltage Regulators
- Local Regulation for Multiple Voltage Distributed
Power Systems
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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:
LTC1649
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.
