Overview
Features and Benefits
- High Voltage Operation: Up to 60V
- Large 1Ω 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
Product Details
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 1Ω 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 |
Applications
- 48V Telecom and Base Station Power Supplies
- Networking Equipment, Servers
- Automotive and Industrial Control
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
-
R419 Reliability Data3/22/2018
-
High Voltage Non-Isolated Devices1/5/2018
Tools & Simulations
LTspice
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.
Models for the following parts are available in LTspice:
LTC3703
LTC3703-5
Product Recommendations
LTC3703-5 Companion Parts
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC3703EG-5#PBF | Material Declaration | Reliability Data | 28-Lead SSOP | |
| LTC3703EG-5#TRPBF | Material Declaration | Reliability Data | 28-Lead SSOP | |
| LTC3703EGN-5#PBF | Material Declaration | Reliability Data | 16-Lead SSOP (Narrow 0.15 Inch) | |
| LTC3703EGN-5#TRPBF | Material Declaration | Reliability Data | 16-Lead SSOP (Narrow 0.15 Inch) | |
| LTC3703IG-5#PBF | Material Declaration | Reliability Data | 28-Lead SSOP | |
| LTC3703IG-5#TRPBF | Material Declaration | Reliability Data | 28-Lead SSOP | |
| LTC3703IGN-5#PBF | Material Declaration | Reliability Data | 16-Lead SSOP (Narrow 0.15 Inch) | |
| LTC3703IGN-5#TRPBF | Material Declaration | Reliability Data | 16-Lead SSOP (Narrow 0.15 Inch) | |
| Wafer Fabrication Data | R419 Reliability Data |
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