LTC3411 Linear Technology, LTC3411 Datasheet - Page 4

• Manufacturer Part Number: LTC3411
• Description: 1.25A/ 4MHz/ Synchronous Step-Down DC/DC Converter
• Manufacturer: Linear Technology

PI FU CTIO S
LTC3411
PIN
1
2
3
4
5
6
7
8
9
10
TYPICAL PERFOR A CE CHARACTERISTICS
4
100mA/
10mV/
V
100
DIV
DIV
95
90
85
80
75
70
65
60
OUT
U
I
L1
1
Efficiency vs Load Current
Burst Mode Operation
V
V
I
CIRCUIT OF FIGURE 7
LOAD
PULSE SKIP
IN
OUT
OPERATION
Burst Mode
SYNC/MODE
= 3.3V
SHDN/R
= 2.5V
= 50mA
U
PGOOD
NAME
SGND
PGND
PV
SV
10
SW
V
I
TH
LOAD CURRENT (mA)
FB
IN
IN
T
FORCED CONTINUOUS
100
2 s/DIV
V
V
CIRCUIT OF FIGURE 7
U
DESCRIPTION
Shutdown/Timing Resistor
Mode Select/Sychronization Pin
Switch Node
Main Power Supply
Signal Power Supply
Power Good Pin
Output Feedback Pin
Error Amplifier Compensation and Run Pin
IN
OUT
Signal Ground
Main Power Ground
= 3.3V
= 2.5V
1000
W
3411 G04
3411 G01.eps
10000
U
100mA/
10mV/
V
OUT
DIV
DIV
I
100
L1
95
90
85
80
75
70
65
60
2.5
Pulse Skipping Mode
V
V
I
CIRCUIT OF FIGURE 7
Efficiency vs V
LOAD
IN
OUT
V
CIRCUIT OF FIGURE 7
OUT
= 3.3V
= 2.5V
= 50mA
I
I
OUT
OUT
= 2.5V
= 400mA
= 1.25A
3.5
2 s/DIV
IN
V
IN
(V)
4.5
– 0.3
– 0.3
MIN
2.5
0
0
0
0
0
NOMINAL (V)
5.5
TYP
3411 G02.eps
0.8
0.8
0
0
3411 G05
100mA/
100mV/
MAX
SV
SV
PV
SV
10mV/
5.5
5.5
1.0
1.5
0.5A/
V
V
DIV
DIV
DIV
DIV
IN
IN
IN
IN
OUT
OUT
I
I
L1
L1
Forced Continuous Mode
V
V
I
CIRCUIT OF FIGURE 7
V
V
I
CIRCUIT OF FIGURE 7
Load Step
LOAD
LOAD
IN
OUT
IN
OUT
= 3.3V
= 3.3V
= 2.5V
= 2.5V
= 50mA
= 0.25mA TO 1.25A
– 0.3
– 0.3
– 0.3
– 0.3
– 0.3
– 0.3
– 0.3
– 0.3
MIN
ABSOLUTE MAX (V)
40 s/DIV
2 s/DIV
SV
SV
PV
SV
SV
SV
sn3411 3411fs
MAX
IN
IN
IN
IN
IN
IN
3411 G03.eps
3411 G06.eps
6
6
+ 0.3
+ 0.3
+ 0.3
+ 0.3
+ 0.3
+ 0.3