lt1931a Linear Technology Corporation, lt1931a Datasheet - Page 9

• Manufacturer Part Number: lt1931a
• Description: Lt1931a - 1.2mhz/2.2mhz Inverting Dc/dc Converters In Thinsot
• Manufacturer: Linear Technology Corporation

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