lt3579iufd-trpbf Linear Technology Corporation, lt3579iufd-trpbf Datasheet - Page 35

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

TYPICAL APPLICATION
90
85
80
75
70
65
60
55
50
45
40
0
Effi ciency and Power Loss
100
LOAD CURRENT (mA)
200
300
V
5V
IN
C
C1, C2: 4.7μF , 25V, X7R, 1206
C
D1-D5: DIODES INC SBR2A40P1
L1: VISHAY IHLP-2525CZ-01-4R7
R1: 1.2k, 2W
**IF DRIVING ASYMMETRICAL LOADS, PLACE A 1.2k, 2W
RESISTOR FROM THE +12V OUTPUT TO THE –12V OUTPUT FOR
IMPROVED LOAD REGULATION OF THE –12V OUTPUT.
IN
OUT1
400
: 10μF , 16V, X7R, 1206
C
10μF
IN
, C
3579 TA21
100k
OUT2
4.7μH
86.6k
500
L1
: 10μF , 25V, X7R, 1210
3
2.7
2.4
2.1
1.8
1.5
1.2
0.9
0.6
0.3
0
V
SHDN
FAULT
RT
SYNC
IN
1MHz, 5V to ±12V Converter
SW1
LT3579
GND
D1
SW2
CLKOUT
GATE
SS
4.7μF
4.7μF
FB
V
C2
C1
C
0.1μF
*MAX TOTAL OUTPUT POWER = 9.6W
D4
D2
D5
D3
27pF
Transient Response with 0.15A to 0.35A to 0.15A
R1**
1.2k
130k
AC COUPLED
AC COUPLED
34k
500mV/DIV
500mV/DIV
1nF
3579 TA20
1A/DIV
V
V
OUT1
OUT2
Symmetrical Output Load Step
I
C
10μF
L
C
10μF
OUT 2
2
OUT1
2
V
12V
0.8A*
OUT1
V
–12V
0.8A*
OUT 2
LT3579/LT3579-1
100μs/DIV
3579 TA22
35
35791f