LTC3873
PRODUCTIONNo RSENSE™ Constant Frequency Current Mode Boost/Flyback/SEPIC DC/DC Controller
- Part Models
- 4
- 1ku List Price
- Starting From $1.94
Overview
- VIN and VOUT Limited Only by External Components
- Internal or Programmable External Soft-Start
- Constant Frequency 200kHz Operation
- Adjustable Current Limit
- Current Sense Resistor Optional
- Maximum 60V on SW Node with RDS(ON) Sensing
- ±1.5% Voltage Reference Accuracy
- Current Mode Operation for Excellent Line and Load Transient Response
- Low Quiescent Current: 300µA
- Low Profile (1mm) ThinSOT™ and (0.75mm) 2mm × 3mm DFN Package
The LTC3873 is a constant frequency, current mode, boost, flyback or SEPIC DC/DC controller that drives an N-channel power MOSFET in high input and output voltage converter applications. Soft-start can be programmed using an external capacitor.
The LTC3873 provides ±1.5% output voltage accuracy and consumes only 300μA quiescent current during normal operation and only 55μA during micropower start-up. Using a 9.3V internal shunt regulator, the LTC3873 can be powered from a high input voltage through a resistor or it can be powered directly from a low impedance DC voltage of 9V or less.
The LTC3873 is available in 8-lead ThinSOT and 2mm x 3mm DFN packages.
| LTC3873 | LTC3873-5 | |
| VCC UV+ | 8.4V | 4.1V |
| VCC UV– | 4V | 2.9V |
Applications
- Telecom Power Supplies
- 42V and 12V Automotive Power Supplies
- Portable Electronic Equipment
Documentation
Data Sheet 1
User Guide 1
Technical Articles 1
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 Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC3873EDDB#TRMPBF | 8-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC3873EDDB#TRPBF | 8-Lead DFN (3mm x 2mm w/ EP) | ||
| LTC3873ETS8#TRMPBF | 8-Lead SOT-23 | ||
| LTC3873ETS8#TRPBF | 8-Lead SOT-23 |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Switching Regulators & Controllers 2 | ||
| LTM8047 | RECOMMENDED FOR NEW DESIGNS | 3.1VIN to 32VIN Isolated μModule (Power Module) DC/DC Converter |
| LTM8048 | RECOMMENDED FOR NEW DESIGNS | 3.1VIN to 32VIN Isolated μModule (Power Module) DC/DC Converter with LDO Post Regulator |
| Parts | Product Life Cycle | Description |
|---|---|---|
| LTC3873-5 | PRODUCTION | No RSENSE™ Constant Frequency Current Mode Boost/Flyback/SEPIC DC/DC Controller |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LTC3873
- LTC3873-5
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.
Evaluation Kits
LTC3873ETS8 Isolated/Non-Isolated Demo Board | 36 ≤ VIN ≤ 72V, VOUT: 3.3V/3A