Datasheet

LTC3411
5
3411fb
TYPICAL PERFORMANCE CHARACTERISTICS
Burst Mode Operation
Pulse Skipping Mode Forced Continuous Mode
PIN FUNCTIONS
PIN NAME DESCRIPTION
NOMINAL (V) ABSOLUTE MAX (V)
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 Amplifi er Compensation and Run Pin 0 1.5 –0.3 SV
IN
+ 0.3
2μs/DIV
V
OUT
10mV/DIV
I
L1
100mA/DIV
3411 G01
V
IN
= 3.3V
V
OUT
= 2.5V
I
LOAD
= 50mA
CIRCUIT OF FIGURE 7
2μs/DIV
V
OUT
10mV/DIV
I
L1
100mA/DIV
3411 G02
V
IN
= 3.3V
V
OUT
= 2.5V
I
LOAD
= 50mA
CIRCUIT OF FIGURE 7
2μs/DIV
V
OUT
10mV/DIV
I
L1
100mA/DIV
3411 G03
V
IN
= 3.3V
V
OUT
= 2.5V
I
LOAD
= 50mA
CIRCUIT OF FIGURE 7
Effi ciency vs Load Current
Effi ciency vs V
IN
Load Step
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
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
40μs/DIV
V
OUT
100mV/DIV
I
L1
0.5A/DIV
3411 G06
V
IN
= 3.3V
V
OUT
= 2.5V
I
LOAD
= 0.25A TO 1.25A
CIRCUIT OF FIGURE 7