Datasheet

LTC1877
5
1877fb
TYPICAL PERFORMANCE CHARACTERISTICS
Start-Up from Shutdown Load Step Response
Load Step Response Load Step Response
Switch Leakage vs Temperature Switch Leakage vs Input Voltage Burst Mode Operation
TEMPERATURE (°C)
–50
1400
1200
1000
800
600
400
200
0
25 75
1877 G12
–25 0
50 100 125
SWITCH LEAKAGE (nA)
V
IN
= 10V
RUN = 0V
MAIN SWITCH
SYNCHRONOUS
SWITCH
INPUT VOLTAGE (V)
0
SWITCH LEAKAGE (nA)
6
10
1877 G13
24 8
16
14
12
10
8
6
4
2
0
RUN = 0V
MAIN SWITCH
SYNCHRONOUS
SWITCH
1877 G14
SW
5V/DIV
V
OUT
20mV/DIV
AC COUPLED
I
L
200mA/DIV
V
IN
= 5V
V
OUT
= 1.5V
C
IN
= 10μF
L = 10μH
C
OUT
= 47μF
I
LOAD
= 50mA
10μs/DIV
1877 G15
RUN
5V/DIV
V
OUT
1V/DIV
I
L
500mA/DIV
V
IN
= 5V
V
OUT
= 1.5V
L = 10μH
C
IN
= 10μF
C
OUT
= 47μF
I
LOAD
= 500mA
50μs/DIV
1877 G16
I
TH
1V/DIV
V
OUT
50mV/DIV
AC COUPLED
I
L
500mA/DIV
V
IN
= 5V
V
OUT
= 1.5V
L
= 10μH
C
IN
= 10μF
C
OUT
= 47μF
I
LOAD
= 50mA TO 500mA
PULSE-SKIPPING MODE
40μs/DIV
1877 G17
V
OUT
50mV/DIV
AC COUPLED
I
L
500mA/DIV
I
TH
1V/DIV
V
IN
= 5V
V
OUT
= 1.5V
L = 10μH
C
IN
= 10μF
C
OUT
= 47μF
I
LOAD
= 50mA TO 500mA
Burst Mode OPERATION
10Ms/DIV10Ms/DIV
40μs/DIV
1877 G18
V
OUT
50mV/DIV
AC COUPLED
I
L
500mA/DIV
I
TH
1V/DIV
V
IN
= 5V
V
OUT
= 1.5V
L = 10μH
C
IN
= 10μF
C
OUT
= 47μF
I
LOAD
= 200mA TO 500mA
PULSE-SKIPPING MODE
20μs/DIV