DocumentationDatasheet
Reliability Data
LT Journal
- Oct 2007 - Compact Controller is a Basic Building Block for Wide Array of DC/DC Conversion Solutions
Press Release
cad_symbol
ltspice
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
Description
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 |
3x2 DFN-8,SOT-23
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC3873EDDB#PBF | DFN | 8 | E | $1.79 | |
| LTC3873EDDB#TRMPBF | DFN | 8 | E | $1.79 | $1.30 |
| LTC3873EDDB#TRPBF | DFN | 8 | E | $1.79 | $1.25 |
| LTC3873EDDB-5#PBF | DFN | 8 | E | $1.79 | |
| LTC3873EDDB-5#TRMPBF | DFN | 8 | E | $1.79 | $1.30 |
| LTC3873EDDB-5#TRPBF | DFN | 8 | E | $1.79 | $1.25 |
| LTC3873ETS8#PBF | SOT | 8 | E | $1.79 | |
| LTC3873ETS8#TRMPBF | SOT | 8 | E | $1.79 | $1.30 |
| LTC3873ETS8#TRPBF | SOT | 8 | E | $1.79 | $1.25 |
| LTC3873ETS8-5#PBF | SOT | 8 | E | $1.79 | |
| LTC3873ETS8-5#TRMPBF | SOT | 8 | E | $1.79 | $1.30 |
| LTC3873ETS8-5#TRPBF | SOT | 8 | E | $1.79 | $1.25 |
| LTC3873IDDB-5#PBF | DFN | 8 | I | $1.84 | |
| LTC3873IDDB-5#TRMPBF | DFN | 8 | I | $1.84 | $1.34 |
| LTC3873IDDB-5#TRPBF | DFN | 8 | I | $1.84 | $1.29 |
| LTC3873ITS8-5#PBF | SOT | 8 | I | $1.84 | |
| LTC3873ITS8-5#TRMPBF | SOT | 8 | I | $1.84 | $1.34 |
| LTC3873ITS8-5#TRPBF | SOT | 8 | I | $1.84 | $1.29 |
| LTC3873EDDB#TRM | DFN | 8 | E | $3.58 | $2.60 |
| LTC3873EDDB | DFN | 8 | E | $3.58 | |
| LTC3873ETS8-5#TRM | SOT | 8 | E | $3.58 | $2.60 |
| LTC3873ETS8-5 | SOT | 8 | E | $3.58 |
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.
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1154A | LTC3873ETS8 Isolated/Non-Isolated Demo Board | 36 ≤ Vin ≤ 72V, Vout: 3.3V/3A | $75.00 |