Datasheet

5
LTC1879
1879f
Load Step
(Pulse Skipping Mode)
Pulse Skipping Mode OperationBurst Mode Operation
TYPICAL PERFOR A CE CHARACTERISTICS
UW
I
L
200mA/DIV
V
OUT
20mV/DIV
SW
5V/DIV
V
OUT
100mV/DIV
I
L
1A/DIV
I
L
200mA/DIV
V
OUT
50mV/DIV
SW
5V/DIV
50µs/DIV
1879 G16
V
IN
= 5V C
IN
= 20µF
V
OUT
= 2.5V C
OUT
= 47µF
L = 4.7µHI
LOAD
= 50mA to 1200mA
2.5µs/DIV
1879 G17
V
IN
= 5V C
IN
= 20µF
V
OUT
= 2.5V C
OUT
= 47µF
L = 4.7µHI
LOAD
= 15mA
25µs/DIV
1879 G18
V
IN
= 5V C
IN
= 20µF
V
OUT
= 2.5V C
OUT
= 47µF
L = 4.7µHI
LOAD
= 15mA
Load Step (Burst Mode Operation)
V
OUT
100mV/DIV
I
L
1A/DIV
50µs/DIV
1879 G15
V
IN
= 5V C
IN
= 20µF
V
OUT
= 2.5V C
OUT
= 47µF
L = 4.7µHI
LOAD
= 50mA to 1200mA
Soft-Start with Shorted Output
I
VIN
500mA/DIV
RUN/SS
1V/DIV
5ms/DIV
1879 G19
V
IN
= 5V C
IN
= 20µF
V
OUT
= 0V C
OUT
= 47µF
L = 4.7µHI
LOAD
= 0A