LTC3863 Datasheet, PDF (32/36 Pages) Linear Technology – 60V Low IQ Inverting DC/DC Controller Wide Operating VIN Range: 3.5V to 60V

LTC3863
TYPICAL APPLICATIONS
440kHz
0.1µF
18nF
1M
64.9k
0.47µF
RUN ^CAP
V_IN
PLLIN/MODE
SENSE
SS
GATE
LTC3863
ITH
FREQ
SGND
V_FBN
PGND ^VFB
27mΩ
C_IN2 +
10µF
50V
×2
V_IN
C_IN1 ^{12V TO 42V}
100µF
50V
Q1 ^D1
L1
10µH 196k
C_OUT1
4.7µF
100V
×2
C_OUT3
100µF
63V
V_OUT
–48V
300mA
100pF
3863 F14a
3.32k
C_IN1: NICHICON UCJ1H101MCL1GS
C_IN2: MURATA GRM32ER71H106H
C_OUT1: TDK CGA6M3X7S2A475K
C_OUT3: UCC EMVH630ARA101MKE
D1: DIODES PDS5100H
L1: WURTH 744314101
Q1: VISHAY SI7113DN
90
80
70
60
50
40
30
20
10
0
0.001
Efficiency
9
PULSE-SKIPPING MODE
Burst Mode OPERATION
8
V_IN = 24V
V_OUT = –48V
7
6
EFFICIENCY
5
4
3
2
POWER LOSS
1
0.01
LOAD CURRENT (A)
0
0.1
3863 F14b
70
60
50
40
30
20
10
0
–10
–20
–30
2
Gain/Phase
105
V_IN = 24V
V_OUT = –48V 90
75
60
PHASE
45
30
GAIN
15
0
–15
–30
20
FREQUENCY (kHz)
–45
200
3863 F14c
Figure 14. 12V to 42V Input, –48V/300mA Output, 440kHz Inverting Converter
Gain/Phase Measurements Taken with OMICRON Lab Bode 100 Vector Network Analyzer.
3863f
32
For more information www.linear.com/3863