JAJSDZ5 October 2017 LM2623-Q1
PRODUCTION DATA.
The switching frequency of the oscillator is selected by choosing an external resistor (R3) connected between VIN and the FREQ pin. See Figure 3 in the Typical Characteristics for choosing the R3 value to achieve the desired switching frequency. A high switching frequency allows the use of very small surface mount inductors and capacitors and results in a very small solution size. TI recommends a switching frequency between 300 kHz and 2 MHz.