Datasheet

LTC3533
4
3533f
TYPICAL PERFORMANCE CHARACTERISTICS
Quiescent Current vs V
IN
(Fixed Frequency Mode)
Burst Mode Quiescent Current
Peak Current Limit vs
Temperature
Automatic Burst Mode Threshold
vs R
BURST
Minimum Start Voltage vs
Temperature
Average Input Current Limit vs
Temperature
Frequency Change vs
Temperature
Feedback Voltage vs Temperature
Switch Pins Before Entering
Boost Mode
T
A
= 25°C, unless otherwise specifi ed.
V
IN
(V)
2.5
V
IN
QUIESCENT CURRENT (mA)
4.0
5.0
3533 G01
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
3530 G02
5.0
50
45
40
35
30
25
20
15
10
5
0
5.5
TEMPERATURE (°C)
–55
–5
CURRENT LIMIT CHANGE (%)
–4
–2
–1
0
5
2
–15
25
45 125
3533 G03
–3
3
4
1
–35 5
65
85
105
R
BURST
(kΩ)
100
0
LOAD CURRENT (mA)
50
100
150
200
125 150 175 200
3533 G04
225 250
LEAVE Burst Mode
OPERATION
ENTER Burst Mode
OPERATION
TEMPERATURE (°C)
–45
MINIMUM START VOLTAGE (V)
1.78
1.80
1.82
75
3533 G05
1.76
1.74
–5 35
–25 95
15 55 115
1.72
1.70
1.84
TEMPERATURE (°C)
–55
CHANGE FROM 25°C (%)
5
4
3
2
1
0
–1
–2
–3
–4
–5
–15
25
45 125
3533 G06
–35 5
65
85
105
TEMPERATURE (°C)
–55
1.056
FREQUENCY (MHz)
1.058
1.062
1.064
1.066
1.076
1.070
–15
25
45 125
3533 G07
1.060
1.072
1.074
1.068
–35 5
65
85
105
TEMPERATURE (°C)
–55
1.2100
FEEDBACK VOLTAGE (V)
1.2200
–15
25
45 125
3533 G08
1.2150
–35 5
65
85
105
1.2250
50ns/DIV
3533 G09
SW1
2V/DIV
SW2
2V/DIV
V
IN
= 2.9V
V
OUT
= 3.3V AT 500mA