LTC3863_15 Datasheet, PDF (32/38 Pages) Linear Technology – 60V Low IQ Inverting DC/DC Controller

LTC3863
Typical Applications
80kHz
82pF
0.1µF
3.3nF
5k
61.9k
0.47µF
RUN ^CAP
V_IN
PLLIN/MODE
SS
SENSE
GATE
LTC3863
ITH
FREQ
SGND
V_FBN
PGND ^VFB
82mΩ
C_IN2 +
10µF
50V
×2
V_IN
C_IN1 ^{3.5V TO 28V}
100µF
50V
Q1 ^D1
L1
15µH 95.3k
C_OUT1
10µF
25V
×2
C_OUT3
100µF
20V
V_OUT
–0.4V
200mA
10pF 191k
3863 F13a
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
Efficiency
50
0.5
PULSE-SKIPPING MODE
Burst Mode OPERATION
40
V_IN = 12V
V_OUT = –0.4V
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
–10
–20
–30
1
Gain/Phase
90
V_IN = 12V
V_OUT = –0.4V 75
60
PHASE
45
30
15
GAIN
0
–15
–30
10
FREQUENCY (kHz)
–45
100
3863 F13c
Figure 13. 3.5V to 28V Input, –0.4V/200mA Output, 80kHz Inverting Converter
Gain/Phase Measurements Taken with OMICRON Lab Bode 100 Vector Network Analyzer.
3863fa
32
For more information www.linear.com/3863