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LTC3805

Features: VIN and VOUT Limited Only by External Components 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 Current Mode O...

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SeekIC No. : 004402356 Detail

LTC3805: Features: VIN and VOUT Limited Only by External Components Adjustable Slope Compensation Adjustable Overcurrent Protection with Automatic Restart Adjustable Operating Frequency (70kHz to 700kHz) wi...

LTC3805 Data Sheet

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Part Number:
LTC3805
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

VIN and VOUT Limited Only by External Components
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
Current Mode Operation for Excellent Line and Load Transient Response
RUN Pin with Precision Threshold and Adjustable Hysteresis
Programmable Soft-Start with One External Capacitor
Low Quiescent Current: 360A
Small 10-Lead MSOP and 3mm * 3mm DFN


Application

Telecom Power Supplies
42V and 12V Automotive Power Supplies
Isolated Electronic Equipment


Pinout

Connection Diagram


Specifications

VCC to GND
       Low Impedance Source ........................ 0.3V to 8.8V
       Current Fed ........................................25mA into VCC*
SYNC ........................................................... 0.3V to 6V
SSFLT ........................................................... 0.3V to 5V
FB, ITH, FS ................................................. 0.3V to 3.5V
RUN ........................................................... 0.3V to 18V
OC, ISENSE .................................................... 0.3V to 1V
Operating Ambient Temperature Range ...40 to 85
Operating Junction Temperature ........................... 125
Storage Temperature Range ...................65 to 125
Lead Temperature (Soldering, 10 sec)
        LTC3805EMSE Only .......................................... 300
*LTC3805 internal clamp circuit regulates VCC voltage to 9.5V


Description

The LTC®3805 is a current mode controller for fl yback DC/DC converters designed to drive an N-channel MOSFET in high input and output voltage converter applications. Operating frequency and slope compensation can be programmed by external resistors. Programmable overcurrent sensing protects the converter from short-circuits. Softstart can be programmed using an external capacitor and the soft-start capacitor also programs an automatic restart feature.

The LTC3805 provides ±1.5% output voltage accuracy and consumes only 360A of quiescent current during normal operation and only 40A during micropower startup. Using a 9.5V internal shunt regulator, the LTC3805 can be powered from a high VIN through a resistor or it can be powered directly from a low impedance DC voltage of 9V or less.

The LTC3805 is available in the 10-lead MSOP package and the 3mm * 3mm DFN package.




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