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ISL8013

3A Low Quiescent Current 1MHz High Efficiency Synchronous Buck Regulator

Renesas Electronics 

ISL8013

The output voltage programming resistor, R3, will depend

on the value chosen for the feedback resistor and the

desired output voltage of the regulator. The value for the

feedback resistor is typically between 10k and 100k

as shown in Equation 4.

R3 = -V----O-R---U-2---T-----0–---.--80---.V--8---V---

(EQ. 4)

If the output voltage desired is 0.8V, then R3 is left

unpopulated and R2 is shorted. There is a leakage

current from VIN to LX. It is recommended to preload the

output with 10µA minimum. For better performance, add

47pF in parallel with R2 (100k

Input Capacitor Selection

The main functions for the input capacitor are to provide

decoupling of the parasitic inductance and to provide

filtering function to prevent the switching current flowing

back to the battery rail. Two 22µF X5R or X7R ceramic

capacitors are a good starting point for the input

capacitor selection.

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FN6309 Rev 3.00

November 23, 2009

Page 16 of 18

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