Datasheet

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