LTC3863_15 Datasheet, PDF (34/38 Pages) Linear Technology – 60V Low IQ Inverting DC/DC Controller

LTC3863
Typical Applications
350kHz
390pF
0.1µF
27nF
14.7k
61.9k
0.47µF
RUN ^CAP
V_IN
PLLIN/MODE
SS
SENSE
GATE
LTC3863
ITH
FREQ
SGND
V_FBN
PGND ^VFB
16mΩ
C_IN2 +
10µF
25V
×2
V_IN
C_IN1 ^{4.5V TO 16V}
100µF
20V
Q1 ^D1
L1
10µH
R_FBO
698k
511k
C_OUT1
33µF
16V
×2
C_OUT3
150µF
16V
×2
V_OUT
–5V 1.7A (SHORT R_FBO)
–12V 1A
68pF
3863 F15a
80.6k
C_IN1: PANASONIC 20SVP100M
C_IN2: TDK C3225X7R1E106M
C_OUT1: TDK C4532X7R1C336M
C_OUT3: PANASONIC 16TQC150MYF
D1: DIODES B540C
L1: TOKO 919AS-100M
Q1: VISHAY SI7129DN-T1-GE3
–5V Efficiency
90
9
V_IN = 12V
80 VOUT = –5V
8
70
7
60
EFFICIENCY
6
50
5
40
PULSE-SKIPPING MODE ⁴
30
Burst Mode OPERATION ₃
20
2
10
0
0.002
POWER LOSS
0.02
0.2
LOAD CURRENT (A)
1
0
2
3863 F15b
–12V Efficiency
90
9
V_IN = 12V
80 VOUT = –12V
8
70
7
60 EFFICIENCY
6
50
5
40
PULSE-SKIPPING MODE ⁴
30
Burst Mode OPERATION ₃
20
2
10
0
0.002
POWER LOSS
0.02
0.2
LOAD CURRENT (A)
1
0
2
3863 F15b
Figure 15. 4.5V to 16V Input, –5V/1.7A, –12V/1A Output, 350kHz Inverting Converter
3863fa
34
For more information www.linear.com/3863