Datasheet

LTC3605A
5
3605afg
For more information www.linear.com/LTC3605A
Switching Frequency vs R
T
Switch Leakage vs V
IN
Efficiency vs V
IN
Frequency vs V
ON
Voltage
Current Limit Foldback
INTV
CC
Load Regulation
RUN Pin Threshold vs Temperature
DCM Operation CCM Operation
Typical perForMance characTerisTics
T
A
= 25°C unless otherwise specified.
R
T
(kΩ)
0
0
FREQUENCY (MHz)
0.5
1.5
2.0
2.5
300 350 400 450
4.5
3605A G10
1.0
50 100 150 200 250 500
3.0
3.5
4.0
V
IN
(V)
0
0
SWITCH LEAKAGE (nA)
50
150
200
250
350
2
10
14
3605A G11
100
300
8
18
20
4
6
12 16
V
IN
(V)
0
EFFICIENCY (%)
86
88
90
15
25
3505A G12
84
82
80
5 10 20
92
94
I
LOAD
= 1A
V
OUT
= 3.3V
I
LOAD
= 5A
96
V
ON
(V)
0
0
FREQUENCY (MHz)
0.5
1.5
2.0
2.5
4
8
10 18
3605A G13
1.0
2 6
12
14
16
3.0
V
IN
= 20V
R
T
= 162k
V
FB
(V)
0
NORMALIZED MAXIMUM OUTPUT CURRENT (%)
80
100
120
0.3 0.5
3605A G14
60
40
0.1 0.2
0.4 0.6 0.7
20
0
INTV
CC
OUTPUT CURRENT (mA)
0
NORMALIZED INTV
CC
(%)
93
99
100
101
40
80
100
3605A G15
91
97
95
92
98
90
96
94
20
60
120
140
T
A
= 25°C
TEMPERATURE (°C)
–40
RUN THRESHOLD (V)
1.20
1.25
1.30
35 85
3605A G16
1.15
1.10
–15 10
60 110
1.05
1.00
V
IN
= 20V
V
OUT
= 2.5V
MODE = 3.3V
I
OUT
= 0A
L1 = 0.5µH
CLKOUT
2V/DIV
V
SW
5V/DIV
I
L
2A/DIV
400ns/DIV
3605A G18
V
IN
= 20V
V
OUT
= 2.5V
MODE = 0V
I
OUT
= 0A
L1 = 0.5µH
CLKOUT
2V/DIV
V
SW
5V/DIV
I
L
2A/DIV
400ns/DIV
3605A G17
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