LT3581 LINER [Linear Technology], LT3581 Datasheet - Page 28

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

LT3581
Typical applicaTions

Transient Response with 430mA to 830mA to 430mA Load Step
2.8V TO 4.2V
AC-COUPLED
0.5A/DIV
1V/DIV
1A/DIV
LOAD
3.3µF
V
V
OUT
IN
C1
I
L
C1: 3.3µF , 16V, X7R, 1206
C2: 22µF , 16V, X7R, 1210
D1: DIODES INC. PD3S230H-7
L1: VISHAY IHLP1616 BZ-01-OR68 (ONLY 4.1mm 4.5mm 2mm)
43.2k
100k
0.68µH
Figure 18. 2MHz, 5V to 12V, 830mA Boost Converter with Output Short Circuit Protection
L1
V
FAULT
SHDN
RT
SYNC
4.7µF
2MHz, 5V, 1.1A Boost Converter Operates from an Input Range of 2.8V to 4.2V
IN
V
5V
IN
SW1 SW2
C1
50µs/DIV
LT3581
GND
C1: 4.7µF , 16V, X7R, 1206
C2, C3: 4.7µF , 25V, X7R, 1206
D1: DIODES INC. PD3S230H-7
CLKOUT
GATE
18.7k
10k
43.2k
SS
D1
FB
V
C
100k
45.3k
68pF
1.5µH
0.1µF
3581 TA02a
L1
V
FAULT
SHDN
RT
SYNC
IN
SW1 SW2
LT3581
GND
D2: VISHAY MSS2P3
L1: SUMIDA CDR6D28MN-IR5
M1: VISHAY SILICONIX SI7123DN
6.98k
22µF
1.5nF
3581 TA03a
C2
CLKOUT
GATE
D1
SS
FB
V
C
V
5V
1.1A
OUT
AC-COUPLED
(BW LIMIT)
200mV/DIV
56pF
0.5A/DIV
C2
4.7µF
V
130k
0.1µF
CLKOUT
1A/DIV
2V/DIV
V
V
OUT
SW
I
L
Switching Waveforms with 830mA Load
90
85
80
75
70
65
60
55
50
Efficiency and Power Loss at V
6.04k
0
10.5k
M1
1nF
200
D2
LOAD CURRENT (mA)
400
V
3581 F18
IN
500ns/DIV
600
C3
4.7µF
V
12V
830mA
OUT
800
1000
IN
3581 TA03b
= 3.3V
1200
3581 TA02b
2000
1800
1600
1400
1200
1000
800
600
400
200
0
3581f