Datasheet

LTC3442
5
3442fa
200µs/DIV
3442 G22
C
OUT
= 100µF
LOW ESR TANTALUM
INDUCTOR
CURRENT
0.5A/DIV
V
OUT
50mV/DIV
1ms/DIV
3442 G23
R
LIM
= 133k
C
LIM
= .001µF
INDUCTOR
CURRENT
0.5A/DIV
R
LIM
PIN
0.5V/DIV
V
OUT
2V/DIV
20µs/DIV
3442 G21
C
OUT
= 100µF
LOW ESR TANTALUM
INDUCTOR
CURRENT
0.5A/DIV
V
OUT
50mV/DIV
50ns/DIV
3442 G17
SW1
2V/DIV
SW2
2V/DIV
V
IN
= 4.2V
V
OUT
= 3.3V AT 500mA
50ns/DIV
3442 G16
SW1
2V/DIV
SW2
2V/DIV
V
IN
= 3.3V
V
OUT
= 3.3V AT 500mA
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Switch Pins in Buck-Boost Mode
Switch Pins Entering
Buck-Boost Mode
Output Ripple at 1A Load
Load Transient Response in Fixed
Frequency Mode, No Load to 1A
Load Transient Response in Auto
Burst Mode Operation, No Load to 1A Burst Mode Operation
Pulsed Overload Using Average
Input Current Limit
Transition from Burst Mode
Operation to Fixed Frequency Mode
1µs/DIV
3442 G18
V
OUT
20mV/DIV
AC COUPLED
V
IN
= 4.2V
V
IN
= 3.3V
V
IN
= 2.7V
100µs/DIV
3442 G19
V
IN
= 3.6V
V
OUT
= 3.3V
C
OUT
= 47µF, X5R CERAMIC
LOAD
0.5A/DIV
V
OUT
100mV/DIV
100µs/DIV
3442 G20
V
IN
= 3.6V
V
OUT
= 3.3V
C
OUT
= 47µF, X5R CERAMIC + 100µF
LOW ESR TANTALUM
LOAD
0.5A/DIV
V
OUT
100mV/DIV
(T
A
= 25°C unless otherwise specified).