LM2735XMFSLASHNOPB datasheet(17/59 Pages) TI

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LM2735, LM2735-Q1

www.ti.com

SNVS485G – JUNE 2007 – REVISED AUGUST 2015

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When using MLCCs, the ESR is typically so low that the capacitive ripple may dominate. When this occurs, the

output ripple will be approximately sinusoidal and 90° phase shifted from the switching action.

Given the availability and quality of MLCCs and the expected output voltage of designs using the LM2735, there

is really no need to review any other capacitor technologies. Another benefit of ceramic capacitors is their ability

to bypass high-frequency noise. A certain amount of switching edge noise will couple through parasitic

capacitances in the inductor to the output. A ceramic capacitor will bypass this noise while a tantalum will not.

Since the output capacitor is one of the two external components that control the stability of the regulator control

loop, most applications will require a minimum at 4.7 µF of output capacitance. Like the input capacitor,

recommended multilayer ceramic capacitors are X7R or X5R. Again, verify actual capacitance at the desired

operating voltage and temperature.

8.2.1.2.4

Setting the Output Voltage

The output voltage is set using the following equation where R1 is connected between the FB pin and GND, and

R2 is connected between VOUT and the FB pin.

Figure 20. Setting Vout

A good value for R1 is 10 k

Ω.

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