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| LTC3442 Datasheet, PDF (5/20 Pages) Linear Integrated Systems – Micropower Synchronous Buck-Boost DC/DC Converter with Automatic Burst Mode Operation | |||
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LTC3442
TYPICAL PERFOR A CE CHARACTERISTICS (TA = 25°C unless otherwise specified).
Switch Pins in Buck-Boost Mode
SW1
2V/DIV
SW2
2V/DIV
Switch Pins Entering
Buck-Boost Mode
SW1
2V/DIV
SW2
2V/DIV
50ns/DIV
VIN = 3.3V
VOUT = 3.3V AT 500mA
3442 G16
50ns/DIV
VIN = 4.2V
VOUT = 3.3V AT 500mA
Output Ripple at 1A Load
VIN = 2.7V
VIN = 3.3V
VIN = 4.2V
3442 G17
VOUT
20mV/DIV
AC COUPLED
1µs/DIV
3442 G18
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
VOUT
100mV/DIV
VOUT
100mV/DIV
VOUT
50mV/DIV
LOAD
0.5A/DIV
100µs/DIV
VIN = 3.6V
VOUT = 3.3V
COUT = 47µF, X5R CERAMIC
LOAD
0.5A/DIV
INDUCTOR
CURRENT
0.5A/DIV
3442 G19
100µs/DIV
VIN = 3.6V
VOUT = 3.3V
COUT = 47µF, X5R CERAMIC + 100µF
LOW ESR TANTALUM
3442 G20
20µs/DIV
COUT = 100µF
LOW ESR TANTALUM
Transition from Burst Mode
Operation to Fixed Frequency Mode
VOUT
50mV/DIV
INDUCTOR
CURRENT
0.5A/DIV
200µs/DIV
COUT = 100µF
LOW ESR TANTALUM
3442 G22
Pulsed Overload Using Average
Input Current Limit
VOUT
2V/DIV
RLIM PIN
0.5V/DIV
INDUCTOR
CURRENT
0.5A/DIV
RLIM = 133k
CLIM = .001µF
1ms/DIV
3442 G23
3442 G21
3442f
5
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