Datasheet

9
LT1931/LT1931A
1931fa
TYPICAL APPLICATIO S
U
V
IN
V
IN
5V
V
OUT
–12V
150mA
1931 TA02
SW
L1A
10µH
L1B
10µH
D1
GND
LT1931
C1: TAIYO YUDEN X5R JMK212BJ475MG
C2: TAIYO YUDEN X5R TMK316BJ105ML
C3: TAIYO YUDEN X5R EMK325BJ106MM
D1: ON SEMICONDUCTOR MBR0520
L1: SUMIDA CLS62-100
C1
4.7µF
C3
10µF
C2
1µF
R2
10k
R1
84.5k
NFB
SHDN
5V to –12V Inverting Converter
LOAD CURRENT (mA)
0
50
EFFICIENCY (%)
60
70
80
25
50
75 100
1931 TA03
125
90
100
55
65
75
85
95
150
Efficiency
V
IN
V
IN
5V
V
OUT
–5V
300mA
1931 TA04
SW
L1
10µH
L2
10µH
D1
GND
LT1931
C1: TAIYO YUDEN X5R JMK212BJ475MG
C2: TAIYO YUDEN X5R LMK212BJ105MG
C3: TAIYO YUDEN X5R JMK212BJ226MM
D1: ON SEMICONDUCTOR MBR0520
L1, L2: MURATA LQH3C100K04
C1
4.7µF
C3
22µF
C2
1µF
R2
10k
R1
29.4k
220pF
NFB
SHDN
5V to –5V Inverting Converter Using Uncoupled Inductors
V
IN
V
IN
5V
V
OUT
–5V
300mA
1931 TA05a
SW
L1
4.7µH
L2
4.7µH
D1
GND
LT1931A
C1: TAIYO YUDEN X5R JMK212BJ475MG
C2: TAIYO YUDEN X5R LMK212BJ105MG
C3: TAIYO YUDEN X5R JMK212BJ475MG
D1: ON SEMICONDUCTOR MBR0520
L1, L2: MURATA LQH3C4R7M24
C1
4.7µF
C3
4.7µF
C2
1µF
R2
10k
R1
28.7k
C4
180pF
NFB
SHDN
LOAD CURRENT (mA)
0
50
EFFICIENCY (%)
55
65
70
75
100
200
250
1931 TA05b
60
80
50
150
300
350
2.2MHz, 5V to –5V Inverting Converter Efficiency