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LTC3586/LTC3586-1

3586fb

applicaTions inForMaTion

–

ERROR

AMP

0.8V

3586 F08

FB3

VC3

CP1

VOUT3

–

ERROR

AMP

0.8V

RFB

3586 F09

FB3

VC3

VOUT3

Figure 8. Error Amplifier with Type I Compensation

Figure 9. Error Amplifier with Type III Compensation

VIN4

LTC3586/

LTC3586-1

SW4

COUT

CPL

3586 F10

VOUT4

FB4

Figure 10. Boost Converter Application Circuit

Boost Regulator Output Voltage Programming

The boost regulator can be programmed for output volt-

ages up to 5V. The output voltage is programmed using a

resistor divider from the VOUT4 pin connected to the FB4

pin such that:

OUT













where VFB4 is 0.8V. See Figure 10.

Typical values for R1 are in the range of 40k to 1M. Too

small a resistor will result in a large quiescent current

in the feedback network and may hurt efﬁciency at low

current. Too large a resistor coupled with the FB4 pin ca-

pacitance will create an additional pole which may result

in loop instability. If large values are chosen for R1 and

R2, a phase-lead capacitor, CPL, across resistor R1 can

improve the transient response. Recommended values

for CPL are in the range of 2pF to 10pF.

Printed Circuit Board Layout Considerations

In order to be able to deliver maximum current under all

conditions,itiscriticalthattheExposedPadonthebackside

oftheLTC3586/LTC3586-1packagesbesolderedtothePC

board ground. Failure to make thermal contact between

the Exposed Pad on the backside of the package and the

copper board will result in higher thermal resistances.

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