Datasheet

LTC3605A
4
3605afg
For more information www.linear.com/LTC3605A
Typical perForMance characTerisTics
Quiescent Current vs V
IN
Efficiency vs Load Current
Shutdown Current vs V
IN
R
DS(ON)
vs Temperature Load Regulation
Load Step
(External ITH Compensation)
Output Tracking
I
INTVCC
Current vs Frequency
Load Step
(Internal ITH Compensation)
T
A
= 25°C unless otherwise specified.
INPUT VOLTAGE (V)
0
QUIESCENT CURRENT (mA)
1.0
1.5
16
3605A G02
0.5
0
4
8
12
20
2.0
INPUT VOLTAGE (V)
0
SHUTDOWN CURRENT (µA)
10
15
16
3605A G03
5
0
4
8
12
20
20
FREQUENCY (MHz)
0
0
I
INTVCC
(mA)
5
15
20
25
1
2
2.5 4.5
3605A G04
10
0.5 1.5
3
3.5
4
MODE = 3.3V
NO LOAD
TEMPERATURE (°C)
–45
0
R
DS(ON)
(mΩ)
20
40
60
80
5 55
3605A G05
100
120
–20 30
80 105
130
TOP FET
BOTTOM FET
I
OUT
(A)
0
NORMALIZED (%)
0.5
1.0
1.5
3 5
3605A G06
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
IN
= 12V
V
OUT
= 1.2V
I
LOAD
= 0.4A
V
OUT
100mV/DIV
AC-COUPLED
I
L
5A/DIV
I
LOAD
5A/DIV
20µs/DIV
3605A G07
V
IN
= 12V
V
OUT
= 1.2V
I
LOAD
= 0.4A
ITH = 3.3V
V
OUT
100mV/DIV
AC-COUPLED
I
L
5A/DIV
I
LOAD
5A/DIV
20µs/DIV
3605A G08
V
IN
= 12V
V
OUT
= 1.2V
500µs/DIV
3605A G09
V
TRACK
V
FB
LOAD CURRENT (A)
0.01
40
EFFICIENCY (%)
50
60
70
80
0.1 1 10
3605A G01
30
20
10
0
90
100
V
IN
= 12V
f
SW
= 1MHz
V
OUT
= 3.3V
V
OUT
= 2.5V
V
OUT
= 1.8V
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