LTC3533 Datasheet, PDF (4/16 Pages) Linear Technology – 2A Wide Input Voltage Synchronous Buck-Boost DC/DC Converter

LTC3533
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise specified.
Quiescent Current vs V_IN
(Fixed Frequency Mode)
4.0
3.5
2.0 MHz
3.0
1.5 MHz
2.5
2.0
1.0 MHz
1.5
0.5 MHz
1.0
NO SWITCHING
0.5
0.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
3533 G01
Automatic Burst Mode Threshold
vs R_BURST
200
150
LEAVE Burst Mode
OPERATION
100
ENTER Burst Mode
OPERATION
50
0
100 125 150 175 200 225 250
R_BURST (kΩ)
3533 G04
Frequency Change vs
Temperature
1.076
1.074
1.072
1.070
1.068
1.066
1.064
1.062
1.060
1.058
1.056
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3533 G07
4
Burst Mode Quiescent Current
50
45
40
35
30
25
20
15
10
5
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
3530 G02
Minimum Start Voltage vs
Temperature
1.84
1.82
1.80
1.78
1.76
1.74
1.72
1.70
–45 –25 –5 15 35 55 75
TEMPERATURE (°C)
95 115
3533 G05
Feedback Voltage vs Temperature
1.2250
Peak Current Limit vs
Temperature
5
4
3
2
1
0
–1
–2
–3
–4
–5
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3533 G03
Average Input Current Limit vs
Temperature
5
4
3
2
1
0
–1
–2
–3
–4
–5
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3533 G06
Switch Pins Before Entering
Boost Mode
1.2200
1.2150
SW1
2V/DIV
SW2
2V/DIV
1.2100
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3533 G08
50ns/DIV
V_IN = 2.9V
V_OUT = 3.3V AT 500mA
3533 G09
3533f