LTC3538 Datasheet, PDF (4/16 Pages) Linear Technology – 800mA Synchronous Buck-Boost DC/DC Converter

LTC3538
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C unless otherwise noted
Switch Pins Before Entering
Buck Mode
V_OUT Ripple in Buck, Buck-Boost
and Boost Modes at 500mA Load
SW1
2V/DIV
SW2
2V/DIV
50ns/DIV
V_IN = 3.9V
V_OUT = 3.3V AT 500mA
V_IN = 2.5V
V_IN = 3.3V
3538 G04
V_IN = 4.2V
1μs/DIV
V_OUT = 3.3V, AC-COUPLED
20mV/DIV
C_OUT = 22μF
I_LOAD = 500mA
3538 G05
Burst Mode Sleep Current vs
Temperature
45
40
35
30
25
20
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
3538 G16
Error Amplifier Source Current vs
Temperature
–12.5
–13.0
–13.5
–14.0
–14.5
–15.0
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
3538 G06
Oscillator Frequency vs
Temperature
1025
V_IN = V_OUT = 3.6V
1000
975
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
3538 G07
Feedback Voltage vs Temperature
1.010
1.005
1.000
0.995
0.990
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
3538 G08
Maximum Output Current
Capability vs V_IN
1800
V_OUT = 3.3V
1600
1400
1200
1000
800
600
400
200
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
3538 G17
Feedback Voltage Line
Regulation
0.4
V_OUT = 3.3V
0.3
0.2
0.1
0
–0.1
–0.2
2.4
3.4
4.4
V_IN (V)
5.4
3538 G09
Minimum Start-Up Voltage
2.3045
2.3040
2.3035
2.3030
2.3025
2.3020
2.3015
2.3010
2.3005
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
3538 G10
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