参数资料
型号: LTC3586EUFE-1#TRPBF
厂商: LINEAR TECHNOLOGY CORP
元件分类: 稳压器
英文描述: BATTERY CHARGE CONTROLLER, PQCC38
封装: 4 X 6 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-38
文件页数: 26/36页
文件大小: 317K
代理商: LTC3586EUFE-1#TRPBF
LTC3586/LTC3586-1
32
3586fa
APPLICATIONS INFORMATION
+
ERROR
AMP
0.8V
R1
R2
3586 F08
FB3
VC3
CP1
VOUT3
+
ERROR
AMP
0.8V
R1
R3
C3
RFB
3586 F09
FB3
VC3
C2
C1
R2
VOUT3
Figure 8. Error Amplier with Type I Compensation
Figure 9. Error Amplier with Type III Compensation
VIN4
LTC3586/
LTC3586-1
L
SW4
R1
COUT
CPL
R2
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:
VV
R
OUT
FB
44
1
2
1
=+
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 efciency 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, 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.
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