LTC3805-5 - Adjustable Frequency Current Mode Flyback/ Boost/SEPIC DC/DC Controller
The LTC3805-5 is a current mode DC/DC controller designed to drive an N-channel MOSFET in flyback, boost and SEPIC converter applications. Operating frequency and slope compensation can be programmed by external resistors. Programmable overcurrent sensing protects the converter from overload and short-circuit conditions. Soft-start can be programmed using an external capacitor and the soft-start capacitor also programs an automatic restart feature.
The LTC3805-5 provides ±1.5% output voltage accuracy and consumes only 360μA of quiescent current during normal operation and only 40μA during micropower startup. Using a 9.5V internal shunt regulator, the LTC3805-5 can be powered from a high VIN through a resistor or it can be powered directly from a low impedance DC voltage from 4.7V to 8.8V.
The LTC3805-5 is available in the 10-lead MSOP package and the 3mm × 3mm DFN package.
Features
Typical Application  | Applications
Packaging  |
| Part Number | Package | Temp | Price(1-99) | Price (1k)* |
|---|---|---|---|---|
| LTC3805EDD-5#PBF | 3x3 DFN-10 | E | $1.99 | $1.39 |
| LTC3805EDD-5#TRPBF | 3x3 DFN-10 | E | $1.45 | |
| LTC3805EMSE-5#PBF | MS-10E | E | $1.99 | $1.39 |
| LTC3805EMSE-5#TRPBF | MS-10E | E | $1.45 | |
| LTC3805HMSE-5#PBF | MS-10E | H | $2.51 | $1.76 |
| LTC3805HMSE-5#TRPBF | MS-10E | H | $1.82 | |
| LTC3805IDD-5#PBF | 3x3 DFN-10 | I | $2.10 | $1.47 |
| LTC3805IDD-5#TRPBF | 3x3 DFN-10 | I | $1.53 | |
| LTC3805IMSE-5#PBF | MS-10E | I | $2.10 | $1.47 |
| LTC3805IMSE-5#TRPBF | MS-10E | I | $1.53 | |
| LTC3805MPMSE-5#PBF | MS-10E | MP | $6.80 | $4.76 |
| LTC3805MPMSE-5#TRPBF | MS-10E | MP | $4.82 |
Demo Boards
| Part Number | Description | Price |
|---|---|---|
| DC1311A-B | LTC3805-5 Isolated Demo Board | Flyback Controller, 18V ≤ VIN ≤ 72V, Vout = 3.3V @ 3A | $75.00 |
| DC1576A | LTC3805IMSE-5 Demo Board | SEPIC, 5V ≤ VIN ≤ 30V, Vout = 12V @ 3A | $75.00 |
- 具宽 VIN 范围的反激式控制器额定在 -55°C 至 150°C 的结温范围
- LTC3805H/-5 - 宽 VIN 范围反激式控制器具有 150oC 最高结温
- DN1022 - Negative Buck Converter with Short-Circuit Protection and Shutdown
- DN458 - Buck Converter Eases the Task of Designing Auxiliary Low Voltage Negative Rails
- R421 Reliability Data
- Wide VIN Range Flyback Controller is Specified over a -55°C to 150°C Junction Temperature Range
- Wide VIN Range Flyback Controllers Feature 150°C Maximum Junction Temperature
- LTC3805-5 Footprints and Symbols
- LTC3805-5 & LT1797 Demo Circuit - Positive-to-Negative Cuk Converter (8-16V to -12V @ 3A)
- LTC3805-5 Demo Circuit - Adjustable Frequency Current Mode Flyback Controller (18-36V to -100V @ 50mA)
