Datasheet

LTC3442
4
3442fa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
(T
A
= 25°C unless otherwise specified).
Quiescent Current vs V
IN
(Fixed Frequency Mode)
Burst Mode Quiescent Current
vs V
IN
Peak Current Clamp vs V
IN
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
Automatic Burst Mode Threshold
vs R
BURST
Minimum Start Voltage
vs Temperature
Average Input Current Limit
vs Temperature (Normalized)
Frequency Change vs Temperature
(Normalized)
Feedback Voltage vs Temperature
(Normalized)
Switch Pins Before Entering
Boost Mode
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
TEMPERATURE (°C)
–55
CHANGE FROM 25°C
0.0%
0.5%
1.0%
105
3442 G13
–0.5%
–1.0%
–2.0%
–15 25 65–35 12554585
–1.5%
2.0%
1.5%
TEMPERATURE (°C)
–55
CHANGE FROM 25°C
1.0%
0.8%
0.6%
0.4%
0.2%
0.0%
–2.0%
–0.4%
–0.6%
–0.8%
–1.0%
–15
25
45 125
3442 G14
–35 5
65
85
105
V
IN
= V
OUT
= 3.3V
50ns/DIV
3442 G15
SW1
2V/DIV
SW2
2V/DIV
V
IN
= 2.9V
V
OUT
= 3.3V AT 500mA