lt3579iufd-trpbf Linear Technology Corporation, lt3579iufd-trpbf Datasheet - Page 36

• 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
36
100
Effi ciency and Power Loss (V
90
80
70
60
50
40
30
20
0
1MHz, 2-Phase Converter Generates a 24V Output from a 8V to 16V Input and Uses Small Components
0.5
1
3.3V TO V
V
8V TO 16V
IN
LOAD CURRENT (A)
1.5
C
C
C
D1, D2: CENTRAL SEMI CTLSH5-40M833
D3: CENTRAL SEMI CTLSH1-40M563
L1, L2: VISHAY IHLP-2525CZ-01-4R7
M1: SILICONIX SI7461DP
= 12V
PWR1,
VIN1,
OUT1M,
V
PWR
2
PWR
C
V
C
VIN2
IN
C
PWR2
OUT1S,
2.5
: 4.7μF , 25V, X7R, 1206
V
: 10μF , 25V, X7R, 1210
500k
IN
3
V
C
C
4.7μF
= 3.3V
OUT1
OUT
VIN1
3.5
PWR
: 4.7μF , 50V, X5R, 1210
C
C
4.7μF
10μF
21.5k
5k
PWR2
3579 TA24
VIN2
4
= 12V)
4.5
C
10μF
100k
PWR1
8
7
6
5
4
3
2
1
0
4.7μH
L2
86.6k
86.6k
4.7μH
V
FAULT
SHDN
RT
V
FAULT
SHDN
RT
SYNC
L1
SYNC
IN
IN
SW1 SW2
SW1 SW2
LT3579-1
LT3579-1
MASTER
SLAVE
*MAX OUTPUT CURRENT
**OPTIONAL FOR OUTPUT SHORT CIRCUIT PROTECTION
GND
GND
V
CLKOUT
CLKOUT
IN
V
GATE
GATE
= 3.3V TO 5V
IN
SS
D1
SS
D2
FB
V
FB
V
= V
C
C
PWR
0.22μF
0.22μF
C
4.7μF
Transient Response with 1.5A to 3.25A to 1.5A
Output Load Step (V
OUT1M
2
AC COUPLED
C
4.7μF
I
OUT1S
2
L1
1V/DIV
5A/DIV
1A/DIV
V
I
PWR
V
+ I
LOAD
2.4A
2.2A
OUT
L2
V
= 8V
47pF
PWR
137k
V
OUT1
D3**
6.4k**
7k
2.2nF
V
M1**
PWR
PWR
3579 F23
3.7A
3.1A
= 12V
100μs/DIV
= 12V and V
V
24V
5.1A*
C
4.7μF
OUT
OUT
2
V
PWR
5.1A
3.9A
IN
= 16V
= 3.3V)
3579 TA25
35791f