The switching regulator LT3461ES6#TRPBF has a built-in Schottky diode. Switching Regulator LT3461ES6#TRPBF When the supply voltage is applied to the VIN pin, the voltage difference between VIN and VOUT generates an inrush current from the input through the inductor and Schottky diode to charge the output capacitor. The maximum non-repetitive surge current that the Schottky diode in the LT3461 can withstand is 1.5A. The selection of the switching regulator LT3461ES6#TRPBF inductance and capacitance should ensure that the peak value of the inrush current is below 1.5A. Additionally, the turn-on of the switching regulator LT3461ES6#TRPBF should be delayed until the inrush current is less than the maximum current limit. The peak inrush current can be calculated as follows:

IP = V -0.6 LC 1?2exp – π?? 2 LC –1?2 ? ? ? ? ? Where L is the inductance, r is the inductor resistance, and C is the output capacitance. Table 3 shows the peak inrush current for some component choices. table 3. Intrusion peak current VIN (V) L(μH) C(μF) IP (A) 5 5 10 1 0.9 1.1 4.7 - 1

Significant power dissipation can occur on the LT3461 and LT3461A, especially at high input voltages. Equipment loads, voltage drops in power path components, and switching losses are the main contributing factors. To ensure that the LT3461 does not exceed the absolute maximum operating junction temperature of 125°C over the operating ambient temperature range, it is important to measure the power dissipation of the device in the application. In general, for supply voltages below 5V, the integrated current limit function provides adequate protection for non-fault conditions. For supply voltages above 5V, Figure 3a and Figure 3b show the recommended operating area for the LT3461 and LT3461A, respectively. These figures are based on 250mW on-chip dissipation. These numbers are expected to improve if the LT3461 is supplied from a separate low pressure rail.

Switching Frequency The key difference between the LT3461 and the LT3461A is the faster switching frequency of the LT3461A. At 3MHz, the LT3461A switches twice as fast as the LT3461. The higher switching frequency of the LT3461A allows physically smaller inductors and capacitors to be used in a given application, but with a slight reduction in efficiency and maximum output current compared to the LT3461. In general, if efficiency and maximum output current are critical, or if a high output voltage is being produced, the LT3461 should be used. If application size and cost are more important then the LT3461A would be the better choice