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LM1117: Design Clarification

Part Number: LM1117

Hai Sir,

Based on Customer recommendation we are using LM1117T for voltage conversion.

End application- Controlling & Analog outputs driving.

Can you please give me the clarification about my queries posted below...

1) Designing Vin= 5V and Vout= 3.3V, Iout= 300mA (Step down conversion)

 -> As per the Datasheet reference Figure 9-3. Fixed Output Regulator , page no.16. Downloaded the Pspice model from TI, Simulated and Verified the Results as per the design.

-> Here external components used Cin- 10uF, Cout- 10uF . Can we use these capacitor values with Ceramic capacitors with series resistors for ESR.

-> or Can we use Cin-10uF ceramic capacitor and Cout-10uF Tantalum capacitor.

  • Hello,

    I would recommend using tantalum caps instead of ceramic caps for all applications as stated in the data sheet. 

    I would be consistent with the data sheet and what types of capacitors it specifies.

    Please let me know if you have any further questions. 

    Thank you,

    Josh Nachassi