Datasheet

LTC3827
5
3827ff
TYPICAL PERFORMANCE CHARACTERISTICS
Effi ciency and Power Loss
vs Output Current Effi ciency vs Load Current Effi ciency vs Input Voltage
Load Step
(Burst Mode Operation)
Load Step
(Forced Continuous Mode)
Load Step
(Pulse Skip Mode)
LOAD CURRENT (mA)
EFFICIENCY (%)
POWER LOSS (mW)
0.01 0.1 1 10 100 1000 10000
3827 G01
0.001
1
10
1000
100
0.1
10000
40
50
60
70
80
30
20
10
0
90
100
Burst Mode OPERATION
FORCED CONTINUOUS MODE
PULSE SKIPPING MODE
V
IN
= 12V
V
OUT
= 3.3V
FIGURE 13 CIRCUIT
LOAD CURRENT (mA)
EFFICIENCY (%)
0.01 0.1 1 10 100 1000 10000
3827 G02
0.001
50
60
70
80
40
90
100
V
IN
= 12V
V
IN
= 5V
V
OUT
= 3.3V
FIGURE 13 CIRCUIT
INPUT VOLTAGE (V)
EFFICIENCY (%)
51015203040
3827 G03
0
25 35
86
88
90
92
94
84
82
96
98
V
OUT
= 3.3V
FIGURE 13 CIRCUIT
20µs/DIV
V
OUT
100mV/DIV
AC
COUPLED
I
L
2A/DIV
3827 G04
V
OUT
= 3.3V
FIGURE 13 CIRCUIT
20µs/DIV
V
OUT
100mV/DIV
AC
COUPLED
I
L
2A/DIV
3827 G05
V
OUT
= 3.3V
FIGURE 13 CIRCUIT
20µs/DIV
V
OUT
100mV/DIV
AC
COUPLED
I
L
2A/DIV
3827 G06
V
OUT
= 3.3V
FIGURE 13 CIRCUIT
Inductor Current at Light Load
Soft Start-Up Tracking Start-Up
4µs/DIV
FORCED
CONTINUOUS
MODE
2A/DIV
BURST MODE
OPERATION
PULSE
SKIPPING
MODE
3827 G07
V
OUT
= 3.3V
I
LOAD
= 300µA
FIGURE 13 CIRCUIT
20ms/DIV
3827 G08
V
OUT2
2V/DIV
V
OUT1
2V/DIV
FIGURE 13 CIRCUIT
20ms/DIV
3827 G09
V
OUT2
2V/DIV
V
OUT1
2V/DIV
FIGURE 13 CIRCUIT