LTC3873 - No RSENSE Constant Frequency Current Mode Boost/Flyback/SEPIC DC/DC Controller
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.
Features- 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
Typical Application
| Applications- Telecom Power Supplies
- 42V and 12V Automotive Power Supplies
- Portable Electronic Equipment
Packaging
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Order Information
Part Number | Package | Temp | Price(1-99) | Price (1k)* |
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LTC3873EDDB#PBF | 3x2 DFN-8 | E | $1.79 | |
LTC3873EDDB#TRMPBF | 3x2 DFN-8 | E | $1.79 | $1.30 |
LTC3873EDDB#TRPBF | 3x2 DFN-8 | E | $1.79 | $1.25 |
LTC3873ETS8#PBF | SOT-23 | E | $1.79 | |
LTC3873ETS8#TRMPBF | SOT-23 | E | $1.79 | $1.30 |
LTC3873ETS8#TRPBF | SOT-23 | E | $1.79 | $1.25 |
Demo Boards
Part Number | Description | Price |
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DC1154A | LTC3873ETS8 Isolated/Non-Isolated Demo Board | 36 ≤ Vin ≤ 72V, Vout: 3.3V/3A | $75.00 |
DatasheetReliability DataLT JournalPress ReleaseLTspice | Related Product- LT3758 - High Input Voltage, Boost, Flyback, SEPIC and Inverting Controller
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