LTC3721-1 - Push-Pull PWM Controller
Features
- High Efficiency Push-Pull PWM
- 1.5A Sink, 1A Source Output Drivers
- Adjustable Push-Pull Dead-Time
- Adjustable System Undervoltage Lockout and Hysteresis
- Adjustable Leading Edge Blanking
- Low Start-Up and Quiescent Currents
- Current Mode Operation
- Single Resistor Slope Compensation
- VCC UVLO and 25mA Shunt Regulator
- Programmable Fixed Frequency Operation to 1MHz
- Soft-Start, Cycle-by-Cycle Current Limiting and Hiccup Mode Short-Circuit Protection
- 5V, 15mA Low Dropout Regulator
- 16-Pin SSOP and (4mm x 4mm) QFN Packages
Typical Application
Description
The LTC3721-1 push-pull PWM controller provides all of the control and protection functions necessary for compact and highly efficient, isolated power converters. High integration minimizes external component count, while preserving design flexibility.
The robust push-pull output stages switch at half the oscillator frequency. Dead-time is independently programmed with an external resistor. A UVLO program input provides precise system turn-on and turn off voltages. The LTC3721-1 features peak current mode control with programmable slope compensation and leading edge blanking.
The LTC3721-1 features extremely low operating and start-up currents and reliable short-circuit and overtemperature protection. The LTC3721-1 is offered in 16-pin SSOP and (4mm × 4mm) QFN packages.
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 |
|---|---|---|---|---|---|
| LTC3721EGN-1#PBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | Yes |
| LTC3721EGN-1#TRPBF | SSOP-16 | GN | E | 05-08-1641 (GN16) | Yes |
| LTC3721EUF-1#PBF | 4x4 QFN-16 | UF | E | 05-08-1692 | Yes |
| LTC3721EUF-1#TRPBF | 4x4 QFN-16 | UF | E | 05-08-1692 | 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 | |
|---|---|---|---|---|---|---|
| LTC3721EGN-1#PBF | SSOP-16 | E | $6.52 | $4.45 | Yes | |
| LTC3721EGN-1#TRPBF | SSOP-16 | E | $4.51 | Yes | ||
| LTC3721EUF-1#PBF | 4x4 QFN-16 | E | $6.70 | $4.55 | Yes | |
| LTC3721EUF-1#TRPBF | 4x4 QFN-16 | E | $4.65 | 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
Applications
- Telecommunications, Infrastructure Power Systems
- Distributed Power Architectures
- Server Power Supplies
- High Density Power Modules
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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:
LTC3721-1
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.
