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LTC3863 Datasheet, PDF (31/36 Pages) Linear Technology – 60V Low IQ Inverting DC/DC Controller Wide Operating VIN Range: 3.5V to 60V | |||
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TYPICAL APPLICATIONS
80kHz
82pF
0.1µF
3.3nF
5k
61.9k
0.47µF
RUN CAP
VIN
PLLIN/MODE
SS
SENSE
GATE
LTC3863
ITH
FREQ
SGND
VFBN
PGND VFB
82mΩ
CIN2 +
10µF
50V
Ã2
VIN
CIN1 3.5V TO 28V
100µF
50V
Q1 D1
L1
15µH 95.3k
COUT1
10µF
25V
Ã2
COUT3
100µF
20V
VOUT
â0.4V
200mA
10pF 191k
3863 F13a
CIN1: NICHICON UCJ1H101MCL1GS
CIN2: MURATA GRM32ER71H108H
COUT1: TDK C4532X7R1C336M
COUT3: PANASONIC 16TQC150MYF
D1: DIODES B540C-13-F
L1: WURTH 7447779115
Q1: FAIRCHILD FDMC5614P
LTC3863
Efficiency
50
0.5
PULSE-SKIPPING MODE
Burst Mode OPERATION
40
VIN = 12V
VOUT = â0.4V
0.4
30
0.3
EFFICIENCY
20
0.2
10
0
0.002
POWER LOSS
0.02
LOAD CURRENT (A)
0.1
0
0.2
3863 F13b
60
50
40
30
20
10
0
â10
â20
â30
1
Gain/Phase
90
VIN = 12V
VOUT = â0.4V 75
60
PHASE
45
30
15
GAIN
0
â15
â30
10
FREQUENCY (kHz)
â45
100
3863 F13c
Figure 13. 3.5V to 28V Input, â0.4V/200mA Output, 80kHz Inverting Converter
Gain/Phase Measurements Taken with OMICRON Lab Bode 100 Vector Network Analyzer.
For more information www.linear.com/3863
3863f
31
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