Datasheet
LTC3863
31
3863f
For more information www.linear.com/3863
TYPICAL APPLICATIONS
Figure 13. 3.5V to 28V Input, –0.4V/200mA Output, 80kHz Inverting Converter
Efficiency Gain/Phase
Gain/Phase Measurements Taken with OMICRON Lab Bode 100 Vector Network Analyzer.
80kHz
82mΩ
L1
15µH
Q1
D1
CAP
0.47µF
PGND
LTC3863
3863 F13a
SS
ITH
FREQ
SGND
RUN
V
IN
PLLIN/MODE
SENSE
GATE
V
FBN
V
FB
5k
61.9k
95.3k
V
OUT
–0.4V
200mA
191k
C
IN1
: NICHICON UCJ1H101MCL1GS
C
IN2
: MURATA GRM32ER71H108H
C
OUT1
: TDK C4532X7R1C336M
C
OUT3
: PANASONIC 16TQC150MYF
D1: DIODES B540C-13-F
L1: WURTH 7447779115
Q1: FAIRCHILD FDMC5614P
V
IN
3.5V TO 28V
C
IN1
100µF
50V
C
OUT1
10µF
25V
×2
C
IN2
10µF
50V
×2
C
OUT3
100µF
20V
3.3nF
0.1µF
82pF
10pF
+
+
LOAD CURRENT (A)
EFFICIENCY (%)
POWER LOSS (W)
50
40
30
3863 F13b
0
20
10
0.5
0.4
0.3
0
0.2
0.1
0.2
0.002 0.02
EFFICIENCY
POWER LOSS
V
IN
= 12V
V
OUT
= –0.4V
PULSE-SKIPPING MODE
Burst Mode OPERATION
FREQUENCY (kHz)
1
–30
GAIN (dB)
PHASE (DEG)
–20
–10
0
10
20
30
40
50
10 100
3863 F13c
60
–45
–30
–15
0
15
30
45
60
75
90
PHASE
GAIN
V
IN
= 12V
V
OUT
= –0.4V