Datasheet

LT8582
34
8582f
TYPICAL APPLICATIONS
12V and 5V Sequenced Outputs from a 3V to 19V Input*
Efficiency and Power Loss
(V
IN
= 12V with Load on 5V Output)
Efficiency and Power Loss
(V
IN
= 12V with Load on 12V Output)
Cycle-to-Cycle (5V Output)Start-Up Waveforms (V
IN
= 12V)
LOAD CURRENT (A)
0
0
EFFICIENCY (%)
POWER LOSS (W)
20
10
70
60
50
40
80
0.4
0.6 0.8 1.6
8582 TA06e
30
0.2
1
1.2 1.4
100
90
0
0.25
1.50
1.25
1.00
0.75
1.75
0.50
2.50
2.25
2.00
LOAD CURRENT (A)
0
20
EFFICIENCY (%)
POWER LOSS (W)
30
80
70
60
50
90
0.4
0.6 1
8582 TA06d
40
0.2
0.8
100
0
0.3
1.8
1.5
1.2
0.9
2.1
0.6
2.4
V
OUT2
50mV/DIV
AC-COUPLED
CLKOUT2
2V/DIV
SWA2, SWB2
10V/DIV
I
L3
+ I
L4
1A/DIV
500ns/DIV
8582 TA06c
V
OUT2
2V/DIV
V
OUT1
5V/DIV
I
L1
+ I
L2
2A/DIV
I
L3
+ I
L4
2A/DIV
2ms/DIV
8582 TA06b
SWB2
SWA2
SWB1
SWA1
LT8582
8582 TA06a
PG1
SYNC1
CLKOUT1
CLKOUT2
115k
10k
SHDN
SYS
M1
M2
SYNC2
PG2
V
IN2
SHDN2
V
IN1
SHDN1
V
C1
SS1
RT1
GND
RT2
SS2
GATE2
V
C2
FBX2
FBX1
GATE1
V
OUT1
12V
0.3A (V
IN
= 3V)
0.5A (V
IN
= 5V)
1A (V
IN
= 12V)
V
OUT2
5V
0.7A (V
IN
= 3V)
1A (V
IN
= 5V)
1.45A (V
IN
= 12V)
V
IN
3V to 19V
0.1µF
0.1µF
1.5nF
47pF
47pF
14.7k
20k
100k
45.3k
L3
6.8µH
s
L1
8.2µH
L2
8.2µH
1.5nF
130k
C
OUT2
22µF
×2
C
OUT1
10µF
×2
107k
107k
C
IN2
10µF
C
IN1
, C
IN2
: 10µF, 25V, X7R, 1210
C
OUT1
: 10µF, 25V, X7R, 1210
C
OUT2
: 22µF, 16V, X7R, 1210
C
1
,C
2
: 2.2µF, 25V, X7R, 0805
D1, D2: CENTRAL SEMI CTLSH2-40M832
L1, L2: COOPER DRQ125-8R2
L3, L4: COOPER DRQ125-6R8
M1, M2: 2N7002
*FOR SYSTEM LEVEL DIAGRAM,
SEE FIGURE 10
C1
2.2µF
D1
C
IN1
10µF
D2
s
s
10k
L4
6.8µH
s
C2
2.2µF