AS3715 datasheet(38/159 Pages) AMSOSRAM

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Page 37

[v1-03] 2015-Aug-10

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AS3715 − Detailed Description – Power Management Functions

Figure 38:

DC/DC SU External Components

DC/DC SU External Components: Shows the external component parameter of the DCDC boost converter.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Cout

Output capacitor

Ceramic,

±20%

2.2

μF

LSU

Inductor

Use inductors with small

Cparasitic (<100pF) to get high

efficiency; Vout >8V

μH

Use inductors with small

Cparasitic (<100pF) to get high

efficiency; Vout <8V

4.7

μH

QSU

Transistor

VGS(TH) threshold voltage

1.3

1.5

VDS max drain to source voltage

Vout_max

+20%

RDS(ON) drain - source ON

resistance

0.35

QGS total gate charge @

VGS=4.5V

C1 / C2

Feedback capacitor

ratio

Ratio should be smaller than the

feedback resistor ratio (inverted)

to avoid overshoots during

start-up

R2 / R1

μF

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