LTC1878 LINER [Linear Technology], LTC1878 Datasheet - Page 5

• Manufacturer Part Number: LTC1878
• Description: High Efficiency Monolithic Synchronous Step-Down Regulator
• Manufacturer: LINER [Linear Technology]

TYPICAL PERFOR A CE CHARACTERISTICS
200mA/DIV
20mV/DIV
COUPLED
2.5
2.0
1.5
1.0
0.5
5V/DIV
0
– 50
V
OUT
SW
Switch Leakage vs Temperature
AC
V
RUN = 0V
I
L
IN
– 25
Pulse Skipping Mode Operation
V
V
L = 10 H
= 7V
IN
OUT
= 4.2V
= 1.5V
0
100mV/DIV
500mA/DIV
TEMPERATURE ( C)
COUPLED
1V/DIV
C
C
I
25
LOAD
V
IN
OUT
SYNCHRONOUS
OUT
I
AC
TH
= 22 F
I
L
1 s/DIV
= 47 F
= 50mA
V
V
L = 10 H
50
Load Step Response
IN
OUT
SWITCH
= 3.6V
= 1.5V
SWITCH
75
W
MAIN
100
C
C
I
PULSE SKIPPING MODE
LOAD
1878 G13
IN
OUT
U
= 22 F
125
40 s/DIV
1878 G15
= 47 F
= 50mA TO 500mA
500mA/DIV
0.6
1.2
1.0
0.8
0.4
0.2
2V/DIV
1V/DIV
0
V
RUN
OUT
0
Switch Leakage vs Input Voltage
RUN = 0V
I
L
V
V
L = 10 H
Start-Up from Shutdown
1878 G18
IN
OUT
1
= 3.6V
= 1.5V
2
SYNCHRONOUS
INPUT VOLTAGE (V)
3
C
C
I
LOAD
IN
OUT
SWITCH
= 22 F
4
40 s/DIV
= 47 F
= 500mA
SWITCH
MAIN
5
100mV/DIV
500mA/DIV
COUPLED
6
1V/DIV
V
OUT
I
7
AC
1878 G20
TH
I
L
V
V
L = 10 H
Load Step Response
1878 G16
IN
OUT
8
= 3.6V
= 1.5V
200mA/DIV
500mA/DIV
50mV/DIV
COUPLED
50mV/DIV
COUPLED
5V/DIV
1V/DIV
C
C
I
Burst Mode OPERATION
LOAD
V
V
IN
OUT
OUT
SW
OUT
I
AC
AC
TH
= 22 F
I
I
L
40 s/DIV
L
= 47 F
= 50mA TO 500mA
Burst Mode Operation
V
V
L = 10 H
V
V
L = 10 H
Load Step Response
IN
OUT
IN
OUT
= 4.2V
= 3.6V
= 1.5V
= 1.5V
C
C
I
C
C
I
PULSE SKIPPING MODE
LOAD
LOAD
IN
OUT
IN
OUT
= 22 F
= 22 F
10 s/DIV
40 s/DIV
= 47 F
= 47 F
= 50mA
1878 G19
= 200mA TO 500mA
LTC1878
1878 G14
1878 G17
5