LT1931 Linear Technology, LT1931 Datasheet - Page 10

• Manufacturer Part Number: LT1931
• Description: 1.2MHz/2.2MHz Inverting DC/DC Converters in ThinSOT
• Manufacturer: Linear Technology

LT1931/LT1931A
TYPICAL APPLICATIO S
10
V
5V
IN
C1: TAIYO YUDEN X5R JMK212BJ225MG
C2: TAIYO YUDEN X5R LMK212BJ105MG
C3: TAIYO YUDEN X5R JMK212BJ475MG
D1: ON SEMICONDUCTOR MBR0520
L1, L2: PANASONIC ELJPC3R3MF
2.2MHz, 5V to –5V Converter Uses Tiny Chip Inductors
C1
2.2 F
12V
V
IN
V
SHDN
IN
LT1931A
3.3 H
C1
4.7 F
16V
GND
L1
V
SS
NFB
SW
SLIC Power Supply with – 33V and – 68V Outputs, Uses Soft-Start
R
15k
SS
U
R1
28.7k
R2
10k
*TOTAL OUTPUT POWER NOT TO EXCEED 3.3W
C1 TO C5: X5R OR X7R
D1, D2: BAV99 OR EQUIVALENT
L1: SUMIDA CR43-220
1 F
C2
C
68nF
V
SS
SHDN
IN
C4
68pF
LT1931
22 H
GND
L1
NFB
SW
R2
1k
D1
3.3 H
L2
1000pF
C6
1931 TA06a
C3
4.7 F
25.5k
1
V
–5V
200mA
R1
R3
OUT
2.7k
R4
C2
1 F
35V
C3
1 F
35V
3
3
80
75
70
65
60
55
50
D1
D2
0
2
1
2
1
50
LOAD CURRENT (mA)
C4
4.7 F
35V
C5
4.7 F
35V
100
Efficiency
1931 TA08
150
COM
V
–33V
100mA*
V
–66V
48mA*
OUT1
OUT2
200
1931 TA06b
250