Datasheet

LTC3605
4
3605fc
TYPICAL PERFORMANCE CHARACTERISTICS
Quiescent Current vs V
IN
Shutdown Current vs V
IN
R
DS(ON)
vs Temperature Load Regulation
Load Step
(External ITH Compensation)
Output Tracking Switching Frequency vs R
T
I
INTVCC
Current vs Frequency
TEMPERATURE (°C)
–45
0
R
DS(ON)
(mΩ)
20
40
60
80
5 55
3605 G04
100
120
–20 30
80 105
130
TOP FET
BOTTOM FET
I
OUT
(A)
0
NORMALIZED (%)
0.5
1.0
1.5
3 5
3605 G05
0
–0.5
1 2
4 6 7
–1.0
–1.5
V
IN
= 12V
V
OUT
= 1.2V
f = 1MHz
MODE = INTV
CC
INTERNAL ITH
COMPENSATION
(ITH = 3.3V)
EXTERNAL ITH
COMPENSATION
V
OUT
50mV/DIV
AC-COUPLED
I
OUT
5A/DIV
I
L
5A/DIV
V
IN
= 12V
V
OUT
= 1.2V
I
OUT
= 0A TO 5A
20µs/DIV
3605 G06
Load Step
(Internal ITH Compensation)
R
T
(kΩ)
0
0
FREQUENCY (MHz)
0.5
1.5
2.0
2.5
300 350 400 450
4.5
3605 G09
1.0
50 100 150 200 250 500
3.0
3.5
4.0
V
IN
(V)
0
2.00
QUIESCENT CURRENT (mA)
2.02
2.06
2.08
2.10
12
2.18
3605 G01
2.04
6
3
15
9
2.12
2.14
2.16
MODE = 0V
NO LOAD
V
IN
(V)
0
SHUTDOWN CURRENT (µA)
9
10
11
9 12
3605 G02
8
7
6
3 6 15
12
13
14
FREQUENCY (MHz)
0
0
I
INTVCC
(mA)
5
15
20
25
1
2
2.5 4.5
3605 G03
10
0.5 1.5
3
3.5
4
MODE = 3.3V
NO LOAD
V
OUT
50mV/DIV
AC-COUPLED
I
OUT
5A/DIV
V
IN
= 12V
V
OUT
= 3.3V
ITH = 3.3V
I
OUT
= 0A TO 5A
20µs/DIV
3605 G07
V
IN
= 12V
V
OUT
= 1.2V
500µs/DIV
3605 G08
V
TRACK
V
FB
T
A
= 25°C unless otherwise specified.