LTC3703-5 - 60V Synchronous Switching Regulator Controller
Features
- High Voltage Operation: Up to 60V
- Large 1 Ohm Gate Drivers (with 5V Supply)
- No Current Sense Resistor Required
- Step-Up or Step-Down DC/DC Converter
- Dual N-Channel MOSFET Synchronous Drive
- Excellent Line and Load Transient Response
- Programmable Constant Frequency: 100kHz to 600kHz
- ±1% Reference Accuracy
- Synchronizable up to 600kHz
- Selectable Pulse Skip Mode Operation
- Low Shutdown Current: 25µA Typ
- Programmable Current Limit
- Undervoltage Lockout
- Programmable Soft-Start
- 16-Pin Narrow SSOP and 28-Pin SSOP Packages
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC3703-5 is a synchronous step-down switching regulator controller that can directly step-down voltages from up to 60V, making it ideal for telecom and automotive applications. The LTC3703-5 drives external logic level N-channel MOSFETs using a constant frequency (up to 600kHz), voltage mode architecture.
A precise internal reference provides 1% DC accuracy. A high bandwidth error amplifier and patented* line feed forward compensation provide very fast line and load transient response. Strong 1W gate drivers allow the LTC3703-5 to drive multiple MOSFETs for higher current applications. The operating frequency is user programmable from 100kHz to 600kHz and can also be synchronized to an external clock for noise-sensitive applications. Current limit is programmable with an external resistor and utilizes the voltage drop across the synchronous MOSFET to eliminate the need for a current sense resistor. For applications requiring up to 100V operation, refer to the LTC3703 data sheet.
| LTC3703-5 | LTC3703 | |
| Maximum VIN | 60V | 100V |
| MOSFET Gate Drive | 4.5V to 15V | 9.3V to 15V |
| VCC UV+ | 3.7V | 8.7V |
| VCC UV– | 3.1V | 6.2V |
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 |
|---|---|---|---|---|---|
| LTC3703EG-5#PBF | SSOP-28 | G | E | 05-08-1640 (G28) | Yes |
| LTC3703EG-5#TRPBF | SSOP-28 | G | E | 05-08-1640 (G28) | Yes |
| LTC3703EGN-5#PBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | Yes |
| LTC3703EGN-5#TRPBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | Yes |
| LTC3703IG-5#PBF | SSOP-28 | G | I | 05-08-1640 (G28) | Yes |
| LTC3703IG-5#TRPBF | SSOP-28 | G | I | 05-08-1640 (G28) | Yes |
| LTC3703IGN-5#PBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | Yes |
| LTC3703IGN-5#TRPBF | SSOP-16 | GN | I | 05-08-1641 (GN16) | 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 | |
|---|---|---|---|---|---|---|
| LTC3703EG-5#PBF | SSOP-28 | E | $4.05 | $3.40 | Yes | |
| LTC3703EG-5#TRPBF | SSOP-28 | E | $3.46 | Yes | ||
| LTC3703EGN-5#PBF | SSOP-16 | E | $3.69 | $3.10 | Yes | |
| LTC3703EGN-5#TRPBF | SSOP-16 | E | $3.20 | Yes | ||
| LTC3703IG-5#PBF | SSOP-28 | I | $5.37 | $3.76 | Yes | |
| LTC3703IG-5#TRPBF | SSOP-28 | I | $3.86 | Yes | ||
| LTC3703IGN-5#PBF | SSOP-16 | I | $5.09 | $3.56 | Yes | |
| LTC3703IGN-5#TRPBF | SSOP-16 | I | $3.62 | 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.Click here to view our complete list of demo boards
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 | |
|---|---|---|---|---|---|---|
| LTC3703IG-5#PBF | SSOP-28 | I | $5.37 | $3.76 | Yes | |
| LTC3703IG-5#TRPBF | SSOP-28 | I | $3.86 | Yes | ||
| LTC3703IGN-5#PBF | SSOP-16 | I | $5.09 | $3.56 | Yes | |
| LTC3703IGN-5#TRPBF | SSOP-16 | I | $3.62 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- 48V Telecom and Base Station Power Supplies
- Networking Equipment, Servers
- Automotive and Industrial Control
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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
To launch a ready to run LTspice demonstration circuit for this part:
- Step 1: If you have not installed LTspice on this computer, download and install LTspice
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To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.
Models for the following parts are available in LTspice:
LTC3703
LTC3703-5
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.
