LT3462 LINER [Linear Technology], LT3462 Datasheet - Page 6

• Manufacturer Part Number: LT3462
• Description: Inverting 1.2MHz/2.7MHz DC/DC Converters with Integrated Schottky in ThinSOT
• Manufacturer: LINER [Linear Technology]

6
3.3V
LT3462/LT3462A
TYPICAL APPLICATIO S
V
IN
TO 4.2V
100mA/DIV
2.7V
C1: TAIYO YUDEN X5R JMK212BJ475MG
C2: TAIYO YUDEN X5R EMK212BJ105MG
C3: TAIYO YUDEN EMK316BJ225
L1, L2: MURATA LQH32CN470
V
10V/DIV
IN
C1
4.7 F
V
OFF
OUT
I
C1: TAIYO YUDEN X5R JMK212BJ475MG
C2: TAIYO YUDEN X5R EMK212BJ105MG
C3: TAIYO YUDEN LMK316BJ475
L1: SUMIDA CLS62-220 OR 2X MURATA LQH32CN330
IN
C1
4.7 F
3.3V to –12V with Soft-Start Circuit
47 H
Current Peaks at 300mA without C
V
L1
OUT
22 H
V
SW
L1A
Reaches –12V in 750 s; Input
IN
LT3462
GND
1 F
Li
C2
SDREF
V
SW
+
IN
LT3462
to –8V Supply
D
FB
GND
1 F
C2
2ms/DIV
SDREF
47 H
L2
D
FB
OFF
22 H
R1
267k
R2
27.4k
L1B
U
R1
267k
R2
42.2k
M1
C4
15pF
3462 TA02c
S1
C4
15pF
C
100nF
22nF
S1
C3
4.7 F
3462 TA03a
V
–8V
OUT
3462 TA02a
C3
2.2 F
V
–12V
30mA
OUT
50mA/DIV
10V/DIV
V
OFF
OUT
I
IN
Current Peaks at 125mA with C
80
75
70
65
60
55
50
80
75
70
65
60
55
50
0
0
V
T
OUT
T
A
A
= 25 C
= 25 C
5
Reaches –12V in 7.5ms; Input
10
10
LOAD CURRENT (mA)
LOAD CURRENT (mA)
–12V Efficiency
–8V Efficiency
20
15
2ms/DIV
V
IN
20
30
= 3.3V
25
V
IN
40
= 3.3V
S1
30
3462 TA02b
= 100nF
3462 TA03b
3462 TA02d
35
50
3462af