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LT8302
23
Rev E
For more information www.analog.com
TYPICAL APPLICATIONS
V
IN
LT8302
SW
9µH
V
IN
8V TO 32V
T1
3:1
1µH
R
FB
R
REF
C3
470pF
Z1
D1
D2
C1
10µF
C2
1µF
C4
220µF
C4
10µF
C5
4.7µF
V
OUT
+
5V/2.0A (V
IN
= 12V)
5V/2.9A (V
IN
= 24V)
V
OUT
–
R3
39Ω
R7
5Ω
V
CC
DRAIN
LT8309
GATE INTV
CC
M1
GND
R4
154k
•
•
R6
OPEN
R2
232k
R1
806k
R8
2.1k
R5
10k
D1: DIODES DFLS1100
D2: CENTRAL CMMSH1-60
M1: INFINEON BSC059N04LS
T1: WURTH 750311564
Z1: CENTRAL CMZ5934B
8302 TA07
TC
EN/UVLO
GND
INTV
CC
LOAD CURRENT (A)
0
EFFICIENCY (%)
85
90
95
1.5 2.5
8302 TA07b
80
75
0.5 1.0
2.0 3.0
70
65
8V to 32V
IN
/5V
OUT
Isolated Flyback Converter with LT8309
–4V to –42V
IN
/12V
OUT
Buck-Boost Converter
–18V to –42V
IN
/–12V
OUT
Negative Buck Converter
Efficiency vs Load Current
Efficiency vs Load Current
Efficiency vs Load Current
V
IN
SW
LT8302
L1
12µH
D1
Z1
GND
R
FB
R
REF
EN/UVLO
C3
47µF
D1: DIODES PMEG6030EP
L1: WÜRTH 744770112
Z1: CENTRAL CMHZ5243B
C2
1µF
V
IN
–4V TO –42V
C1
10µF
R5
10k
8302 TA08a
V
OUT
12V/0.45A (V
IN
= –5V)
12V/0.8A (V
IN
= –12V)
12V/1.1A (V
IN
= –24V)
12V/1.3A (V
IN
= –42V)
R4
118k
INTV
CC
LOAD CURRENT (mA)
0
65
EFFICIENCY (%)
70
75
80
85
90
95
200 400 800600 1000 1200 1400
8302 TA08b
V
IN
= –5V
V
IN
= –12V
V
IN
= –24V
V
IN
= –42V
V
IN
LT8302
L1
12µH
V
OUT
–12V
1.8A
D1
Z1
SW
R
REF
EN/UVLO
R
FB
EN/UVLO
D1: DIODES PMEG6030EP
L1: WÜRTH 744770112
Z1: CENTRAL CMHZ5243B
C2
1µF
V
IN
–18V TO –42V
C1
10µF
C3
47µF
R5
10k
8302 TA09a
R4
118k
R2
232k
R1
806k
INTV
CC
LOAD CURRENT (mA)
0
70
EFFICIENCY (%)
75
80
85
90
95
100
500 1000 1500 2000
8302 TA09b
V
IN
= –18V
V
IN
= –24V
V
IN
= –42V
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