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LTC1735CS-1

Specifications

SKU: 11650479

BUY LTC1735CS-1 https://www.utsource.net/itm/p/11650479.html

Parameter Symbol Conditions Min Typical Max Unit
Input Voltage Range VIN Continuous Operation 4.5 - 60 V
Output Voltage Range VOUT Adjustable 1.225 - 60 V
Quiescent Current IQ VOUT = 5V, No Load - 80 - μA
Shutdown Current ISD VIN = 12V, SHDN Low - 1 - μA
Maximum Switch Current ISW(MAX) Continuous Operation - 1.5 - A
Minimum On-Time tON(MIN) - - 1.1 - μs
Operating Frequency fSW - - 1.1 2.2 MHz
Efficiency η VIN = 12V, VOUT = 5V, IOUT = 1A - 85 - %
Output Voltage Accuracy ΔVOUT VOUT = 5V, 25°C to 85°C - ±1 - %
Thermal Shutdown Temperature TSD - - 160 - °C

Instructions for Use:

  1. Input Voltage (VIN):

    • Ensure the input voltage is within the range of 4.5V to 60V.
    • Use appropriate input filtering and decoupling capacitors to stabilize the input voltage.
  2. Output Voltage (VOUT):

    • The output voltage can be adjusted using external resistors.
    • Use the formula: VOUT = 1.225 * (1 + R1/R2) where R1 and R2 are the resistor values.
  3. Quiescent Current (IQ):

    • The quiescent current is typically 80 μA at no load.
    • This value helps in calculating the overall efficiency of the converter.
  4. Shutdown Mode:

    • To enter shutdown mode, pull the SHDN pin low.
    • The shutdown current is typically 1 μA.
  5. Switch Current (ISW(MAX)):

    • The maximum switch current is 1.5A.
    • Ensure the inductor and other components can handle this current.
  6. Minimum On-Time (tON(MIN)):

    • The minimum on-time is 1.1 μs.
    • This affects the duty cycle and should be considered when designing the output filter.
  7. Operating Frequency (fSW):

    • The operating frequency can be set between 1.1 MHz and 2.2 MHz.
    • Higher frequencies reduce the size of external components but may increase switching losses.
  8. Efficiency (η):

    • The typical efficiency is 85% at VIN = 12V, VOUT = 5V, and IOUT = 1A.
    • Optimize the design to achieve the best efficiency.
  9. Output Voltage Accuracy (ΔVOUT):

    • The output voltage accuracy is ±1% over the temperature range from 25°C to 85°C.
    • Ensure the feedback network is stable and well-designed.
  10. Thermal Management:

    • The device will shut down if the temperature exceeds 160°C.
    • Use proper heat sinking or cooling methods to keep the device within safe operating temperatures.
(For reference only)

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