lt3579iufd-trpbf Linear Technology Corporation, lt3579iufd-trpbf Datasheet - Page 32

• Manufacturer Part Number: lt3579iufd-trpbf
• Description: Lt3579/lt3579-1 6a Boost/inverting Dc/dc Converter With Fault Protection Features
• Manufacturer: Linear Technology Corporation

LT3579/LT3579-1
TYPICAL APPLICATION
32
90
80
70
60
50
40
30
20
10
0
3V TO 33V (OPERATING)
6V TO 16V (START-UP)
0.5
V
Effi ciency and Power Loss
BAT
= 3V
1
LOAD CURRENT (A)
1.5
V
BAT
D1
15V
2
2.5
500kHz SEPIC Converter Generates 3.3V from a 3V to 33V Input
200k
V
C1: 10nF , 16V, X7R, 0603
C
C
C
D1: CENTRAL SEMI CMHZ5245B-LTZ
D2: VISHAY SS5P6
D3: CENTRAL SEMI CMMSH2-40
D4: CENTRAL SEMI CMMSH2-40
L1, L2: WÜRTH WE-DD 744870003
M1: 2N7002
Q1: MMBT3904
BAT
VIN
PWR
OUT
3
C1
10nF
: 10μF , 16V, X7R, 1206
= 12V
: 47μF , 6.3V, X7R, 1210
, C2: 4.7μF , 50V, X7R, 1210
3.5
Q1
3579 TA08a
4
4
3.5
3
2.5
2
1.5
1
0.5
0
M1
C
10μF
100k
174k
VIN
•
3.3μH
C
4.7μF
L1
PWR
2
V
SHDN
FAULT
RT
SYNC GND
IN
SW1 SW2
LT3579
D3
Transient Response with 9V to 33V to 9V V
CLKOUT
GATE
SS
VC
FB
0.22μF
10k
D4
10V/DIV
I
L1 +
2V/DIV
1A/DIV
4.7μF
V
V
C2
OUT
BAT
10k
I
L2
4.7nF
100pF
L
3.3μH
•
D2
2
24.9k
8.25k
3579 TA07a
4.7nF
50ms/DIV
V
3.3V
1.8A (V
3.1A (V
3.4A (V
C
47μF
OUT
OUT
6
BAT
BAT
BAT
BAT
Glitch (R
= 3V)
= 9V)
≥
12V)
3579 TA08b
LOAD
= 1.5Ω)
35791f