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LTC3863 Datasheet, PDF (30/36 Pages) Linear Technology – 60V Low IQ Inverting DC/DC Controller Wide Operating VIN Range: 3.5V to 60V | |||
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LTC3863
TYPICAL APPLICATIONS
750kHz
50pF
0.1µF
4.7nF
36.5k
100k
0.47µF
RUN CAP
VIN
PLLIN/MODE
SS
SENSE
GATE
LTC3863
ITH
FREQ
SGND
VFBN
PGND VFB
CIN1 +
100µF
50V
25mΩ
VIN
CIN2 5V TO 23V
10µF
25V
Ã2
Q1 D1
L1
15µH 191k
COUT1
10µF
25V
Ã2
COUT3
100µF
20V
VOUT
â18V
700mA
47pF
3863 F12a
8.45k
CIN1: NICHICON UCJ1H101MCL1GS
CIN2: TDK C3225X7R1E108M
COUT1: MURATA GRM32DR61E106KA12L
COUT3: PANASONIC 20SVO100M
D1: DIODES SBR8U60P5
L1: WURTH 744770115
Q1: VISHAY SI7469DP
90
80
70
60
50
40
30
20
10
0
0.001
Efficiency
PULSE-SKIPPING MODE
Burst Mode OPERATION
VIN = 12V
VOUT = â18V
EFFICIENCY
POWER LOSS
0.01
0.1
LOAD CURRENT (A)
9
8
7
6
5
4
3
2
1
0
1
3863 F12b
60
50
40
30
20
10
0
â10
â20
â30
1
Gain/Phase
90
VIN = 12V
VOUT = â18V 75
60
PHASE
45
30
15
GAIN
0
â15
â30
10
FREQUENCY (kHz)
â45
100
3863 F12c
Figure 12. 5V to 23V Input, â18V/700mA Output, 750kHz Inverting Converter
Gain/Phase Measurements Taken with OMICRON Lab Bode 100 Vector Network Analyzer.
3863f
30
For more information www.linear.com/3863
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