LTC3805-5
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LTC3805-5

Adjustable Frequency Current Mode Flyback/Boost/SEPIC DC/DC Controller

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 12
1ku List Price Starting From $1.71
Features
  • VIN and VOUT Limited Only by External Components
  • 4.5V Undervoltage Lockout Threshold
  • Adjustable Slope Compensation
  • Adjustable Overcurrent Protection with Automatic Restart
  • Adjustable Operating Frequency (70kHz to 700kHz) With One External Resistor
  • Synchronizable to an External Clock
  • ±1.5% Reference Accuracy
  • Only 100mV Current Sense Voltage Drop
  • RUN Pin with Precision Threshold and Adjustable Hysteresis
  • Programmable Soft-Start with One External Capacitor
  • Low Quiescent Current: 360μA
  • Small 10-Lead MSOP and 3mm × 3mm DFN
Additional Details
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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.


Turn On Voltage
LTC3805 8.4V
LTC3805-5 4.5V

Applications

  • Automotive Power Supplies
  • Telecom Power Supplies
  • Isolated Electronic Equipment
  • Auxiliary/Housekeeping Power Supplies
  • Power over Ethernet
Part Models 12
1ku List Price Starting From $1.71

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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LTC3805HMSE-5#PBF
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LTC3805HMSE-5#TRPBF
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LTC3805IDD-5#PBF
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LTC3805IDD-5#TRPBF
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LTC3805IMSE-5#PBF
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LTC3805MPMSE-5#PBF
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Product Lifecycle

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Feb 4, 2020

- 20_0130

Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC

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PRODUCTION

LTC3805EMSE-5#TRPBF

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LTC3805HMSE-5#PBF

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LTC3805HMSE-5#TRPBF

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LTC3805IMSE-5#PBF

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LTC3805IMSE-5#TRPBF

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LTC3805MPMSE-5#PBF

PRODUCTION

LTC3805MPMSE-5#TRPBF

PRODUCTION

Oct 11, 2022

- 22_0244

Epoxy Change from Henkel 8290 to 8290A for MSOP Package

LTC3805IMSE-5#PBF

PRODUCTION

LTC3805IMSE-5#TRPBF

PRODUCTION

LTC3805MPMSE-5#PBF

PRODUCTION

LTC3805MPMSE-5#TRPBF

PRODUCTION

Jul 12, 2022

- 22_0157

UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages [With Modification in BOM]

Jun 21, 2022

- 22_0050

UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Feb 4, 2020

- 20_0130

arrow down

Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC

LTC3805EMSE-5#PBF

PRODUCTION

LTC3805EMSE-5#TRPBF

PRODUCTION

LTC3805HMSE-5#PBF

PRODUCTION

LTC3805HMSE-5#TRPBF

PRODUCTION

LTC3805IMSE-5#PBF

PRODUCTION

LTC3805IMSE-5#TRPBF

PRODUCTION

LTC3805MPMSE-5#PBF

PRODUCTION

LTC3805MPMSE-5#TRPBF

PRODUCTION

Oct 11, 2022

- 22_0244

arrow down

Epoxy Change from Henkel 8290 to 8290A for MSOP Package

LTC3805IMSE-5#PBF

PRODUCTION

LTC3805IMSE-5#TRPBF

PRODUCTION

LTC3805MPMSE-5#PBF

PRODUCTION

LTC3805MPMSE-5#TRPBF

PRODUCTION

Jul 12, 2022

- 22_0157

arrow down

UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages [With Modification in BOM]

Jun 21, 2022

- 22_0050

arrow down

UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

reference details image

DC1576A

LTC3805IMSE-5 Demo Board | SEPIC, 5V ≤ VIN ≤ 30V, VOUT = 12V @ 3A

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DC1576A

LTC3805IMSE-5 Demo Board | SEPIC, 5V ≤ VIN ≤ 30V, VOUT = 12V @ 3A

LTC3805IMSE-5 Demo Board | SEPIC, 5V ≤ VIN ≤ 30V, VOUT = 12V @ 3A

Product Detail

Demonstration circuit 1576 is high efficiency non-isolated SEPIC (Single Ended Primary Inductor Converter) converter featuring the LTC3805-5 switching controller. The DC1576 converts a 5V to 30V input to 12V at 3A of output current. The DC1576 can be easily modified to generate output voltages in the range from 0.8V to 48V.

reference details image

DC1311A-B

LTC3805-5 Isolated Demo Board | Flyback Controller, 18V ≤ VIN ≤ 72V, VOUT = 3.3V @ 3A

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DC1311A-B

LTC3805-5 Isolated Demo Board | Flyback Controller, 18V ≤ VIN ≤ 72V, VOUT = 3.3V @ 3A

LTC3805-5 Isolated Demo Board | Flyback Controller, 18V ≤ VIN ≤ 72V, VOUT = 3.3V @ 3A

Product Detail

Demonstration circuit 1311 is a Telecom isolated DC/DC converter featuring the LTC3805/-5 constant frequency current mode flyback controller. The DC1311 converts an 18V to 72V input voltage to an isolated 3A of output current at 3.3V. The 300kHz constant frequency operation is maintained down to very light load to reduce low frequency noise generated over a wide range of load current. The converter provides high output voltage accuracy (typically ±2%) over wide load range with no minimum load requirement.

The DC1311 also provides non-isolated design by removing opto coupler and LTC4430 circuit. The demonstration circuit can be easily modified to generate different output voltages up to 15V.
Tools & Simulations

Tools & Simulations 1

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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