LTC3586EUFE#PBF Linear Technology, LTC3586EUFE#PBF Datasheet - Page 32

• Manufacturer Part Number: LTC3586EUFE#PBF
• Description: IC MANAGER USB PWR HI-EFF 38QFN
• Manufacturer: Linear Technology

Specifications of LTC3586EUFE#PBF

• Applications: Handheld/Mobile Devices
• Voltage - Supply: 4.35 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 38-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -

LTC3586/LTC3586-1
applicaTions inForMaTion

Figure 9. Error Amplifier with Type III Compensation
Figure 8. Error Amplifier with Type I Compensation
Figure 10. Boost Converter Application Circuit
LTC3586-1
LTC3586/
ERROR
AMP
V
IN4
V
SW4
OUT4
+
–
ERROR
FB4
AMP
+
–
FB3
V
0.8V
C3
L
C
PL
FB3
V
0.8V
C3
R2
C1
C2
C
P1
R1
R2
3586 F10
V
V
OUT3
OUT3
R1
R
3586 F09
R1
R2
C
FB
3586 F08
OUT
R3
C3
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 V
pin such that:
where V
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, C
improve the transient response. Recommended values
for C
Printed Circuit Board Layout Considerations
In order to be able to deliver maximum current under all
conditions, it is critical that the Exposed Pad on the backside
of the LTC3586/LTC3586-1 packages be soldered to the PC
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.
V
OUT
PL
are in the range of 2pF to 10pF.
4
FB4
=
V
is 0.8V. See Figure 10.
FB
4



R
R
2
1
+
1



OUT4
PL
pin connected to the FB4
, across resistor R1 can
3586fb