LT3581 LINER [Linear Technology], LT3581 Datasheet - Page 31

• Manufacturer Part Number: LT3581
• Description: 3.3A Boost/Inverting DC/DC Converter with Fault Protection
• Manufacturer: LINER [Linear Technology]

Typical applicaTions
(V
BAT
AT START-UP = 6V TO 16V)
80
75
70
65
60
55
50
0
V
400
BAT
LOAD CURRENT (mA)
3V TO 36V
= 9V
Efficiency
V
BAT
V
18V
D1
BAT
V
800
BAT
Wide Input Range, 3.3V SEPIC Converter Can Operate from 3V to 36V
= 3V
C1: 10µF , 50V, X7R, 1210
C2: 10nF , 25V, X7R, 0603
C3: 4.7µF , 25V, X7R, 1206
C4: 2.2µF , 50V, X7R, 1206
C5: 47µF , 10V, X7R, 1210
D1: CENTRAL SEMI CMHZ5248B-LTZ
= 12V
10nF
200k
C2
1200
Q1
3581 TA07b
M1
1600
174k
C3
4.7µF
100k
C1
10µF
3.3µH
L1
V
SHDN
FAULT
RT
SYNC
D2: CENTRAL SEMI CMMSH2-40
D3: DIODES INC. PD3S230H-7
L1, L2: COILCRAFT MSD7342-332MLB
M1: 2N7002
Q1: MMBT3904
IN
SW1
LT3581
GND
CLKOUT
SW2
GATE
10V/DIV
10k
SS
2V/DIV
2A/DIV
V
FB
C
V
V
D3
Wide Input Range SEPIC Can Ride Through V
OUT
BAT
I
L
10k
Voltages that Are Higher than V
V
470pF
24.9k
2.2µF
BAT
C4
47pF
= 17V
1µF
•
L2
3.3µH
D2
V
V
OUT
BAT
10k
1s/DIV
2.2nF
3581 TA07a
= 3.3V
= 31V
C5
47µF
V
3.3V
0.9A (3V < V
1.5A (V
2
OUT
BAT
IN_OVP
= 9V)
3581 TA07c
BAT
LT3581
< 9V)
BAT

3581f