Datasheet

LTC3538
4
3538fb
Error Amplifi er Source Current vs
Temperature
Oscillator Frequency vs
Temperature Feedback Voltage vs Temperature
Feedback Voltage Line
Regulation Minimum Start-Up Voltage
Switch Pins Before Entering
Buck Mode
V
OUT
Ripple in Buck, Buck-Boost
and Boost Modes at 500mA Load
Burst Mode Sleep Current vs
Temperature
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C unless otherwise noted
Maximum Output Current
Capability vs V
IN
50ns/DIV
SW1
2V/DIV
SW2
2V/DIV
3538 G04
V
IN
= 3.9V
V
OUT
= 3.3V AT 500mA
TEMPERATURE (°C)
–50
20
Burst Mode SLEEP CURRENT (μA)
25
30
35
40
45
–25 0 25 50
3538 G16
75 100
TEMPERATURE (°C)
–50
–15.0
V
C
SOURCE CURRENT (μA)
–14.5
–14.0
–13.5
–13.0
–12.5
–25 0 25 50
3538 G06
75 100
TEMPERATURE (°C)
–50
975
OSCILLATOR FREQUENCY (kHz)
1000
1025
–25 0 25 50
3538 G07
75 100
V
IN
= V
OUT
= 3.6V
TEMPERATURE (°C)
–50
0.990
FB VOLTAGE (V)
1.010
1.005
1.000
0.995
–25 0 25 50
3538 G08
75 100
V
IN
(V)
2.0 2.5 3.0 3.5 4.0 5.04.5
0
OUTPUT CURRENT CAPABILITY (mA)
1800
1600
1400
1200
1000
600
400
200
800
3538 G17
5.5
V
OUT
= 3.3V
V
IN
(V)
2.4
–0.2
FB LINE REGULATION (%)
0.4
0.2
0.1
0
–0.1
0.3
3.4 4.4
3538 G09
5.4
V
OUT
= 3.3V
TEMPERATURE (°C)
–50
2.3005
2.3010
2.3015
2.3020
2.3025
2.3030
2.3035
2.3040
V
IN
START VOLTAGE (V)
2.3045
–25 0 25 50
3538 G10
75 100
1μs/DIV
3538 G05
V
OUT
= 3.3V, AC-COUPLED
20mV/DIV
C
OUT
= 22μF
I
LOAD
= 500mA
V
IN
= 2.5V
V
IN
= 3.3V
V
IN
= 4.2V