Datasheet

LTC3442
4
3442fb
For more information www.linear.com/LTC3442
TYPICAL PERFORMANCE CHARACTERISTICS
Quiescent Current vs V
IN
(Fixed Frequency Mode)
Burst Mode Quiescent Current
vs V
IN
Peak Current Clamp vs V
IN
Automatic Burst Mode Threshold
vs R
BURST
Minimum Start Voltage
vs Temperature
Average Input Current Limit
vs Temperature (Normalized)
Input Current Mirror Linearity
Average Input Current Limit
vs
V
IN
(Normalized)
Average Input Current Limit
vs Frequency (Normalized)
INPUT CURRENT (A)
0
1.00
0.90
0.80
0.60
0.70
0.50
0.40
0.30
0.20
0.10
0.00
.40
3442 G04
.10.05 .15 .25 .35 .45
.20
.30
.50
R
LIM
VOLTAGE (V)
V
IN
= 3.6V
V
OUT
= 3.3V
R
LIM
= 133k
V
IN
(V)
2.5
% CHANGE (NORMALIZED)
4.0
5.0
3442 G05
3.0 3.5 4.5
8
6
4
2
0
–2
–4
–6
–8
V
OUT
= 3.3V
1MHz
FREQUENCY (MHz)
0.50
% CHANGE (NORMALIZED)
0.75
1.00
1.25 1.50
3442 TA01b
1.75
15
10
5
0
–5
–10
2.00
V
IN
= 5V
V
OUT
SHORTED
V
OUT
DROPS 10%
(T
A
= 25°C unless otherwise specified).
V
IN
(V)
2.5
V
IN
QUIESCENT CURRENT (mA)
4.0
5.0
3442 G07
3.0 3.5 4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
5.5
2.0 MHz
1.5 MHz
1.0 MHz
0.5 MHz
NO SWITCHING
V
IN
(V)
2.5
V
IN
QUIESCENT CURRENT (µA)
3.0
3.5
4.0 4.5
3442 G08
5.0
50
45
40
35
30
25
20
15
10
5
0
5.5
V
IN
(V)
2.5
2.0
2.5
3.0
4.0 5.0
3442 G09
1.5
1.0
3.0 3.5
4.5 5.5
0.5
0.0
INPUT CURRENT (A)
3.5
R
BURST
(kΩ)
150
60
LOAD CURRENT (mA)
70
90
100
110
160
130
175 225
3442 G10
80
140
150
120
200
250
ENTER Burst Mode
OPERATION
LEAVE Burst Mode
OPERATION
TEMPERATURE (°C)
–55
MINIMUM START VOLTAGE (V)
–25
5
35 65
3442 G11
95
2.30
2.29
2.28
2.27
2.26
2.25
2.24
2.23
2.22
2.21
2.20
125
TEMPERATURE (°C)
–55
CHANGE FROM 25°C
5%
4%
3%
2%
1%
0%
–1%
–2%
–3%
–4%
–5%
–15
25
45 125
3442 G12
–35 5
65
85
105
V
IN
= V
OUT
= 3.3V