LTC3826 Linear Technology, LTC3826 Datasheet - Page 5

• Manufacturer Part Number: LTC3826
• Description: 2-Phase Synchronous Step-Down Controller
• Manufacturer: Linear Technology

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TYPICAL PERFORMANCE CHARACTERISTICS
100mV/DIV
CONTINUOUS
COUPLED
OPERATION
Burst Mode
100
SKIPPING
2A/DIV
90
80
70
60
50
40
30
20
10
0.00001 0.0001
FORCED
0
V
2A/DIV
PULSE
OUT
MODE
MODE
Effi ciency and Power Loss
vs Output Current
AC
FIGURE 13 CIRCUIT
I
CONTINUOUS
L
FIGURE 13 CIRCUIT
V
Load Step
(Burst Mode Operation)
OUT
Inductor Current at Light Load
FIGURE 13 CIRCUIT
V
I
LOAD
OUT
Burst Mode OPERATION
PULSE SKIPPING MODE
FORCED
= 3.3V
= 3.3V
= 100μA
OUTPUT CURRENT (A)
0.001
0.01
20μs/DIV
2μs/DIV
0.1
V
V
IN
OUT
= 12V
1
= 3.3V
3826 G01
3826 G04
10
3826 G07
10000
1000
100
10
1
0.1
100mV/DIV
COUPLED
2A/DIV
V
100
OUT
90
80
70
60
50
40
30
20
10
0.00001 0.0001
AC
0
I
L
Effi ciency vs Output Current
Load Step
(Forced Continuous Mode)
FIGURE 13 CIRCUIT
V
Soft-Start-Up
FIGURE 13 CIRCUIT
V
OUT
FIGURE 13 CIRCUIT
OUT
= 3.3V
= 3.3V
OUTPUT CURRENT (A)
0.001
20ms/DIV
20μs/DIV
0.01
0.1
V
V
IN
IN
1
2V/DIV
2V/DIV
= 12V
= 5V
V
V
OUT2
OUT1
3826 G02
3826 G05
3826 G08
10
100mV/DIV
COUPLED
2A/DIV
82
98
96
94
92
90
88
86
84
V
OUT
AC
0
I
Effi ciency vs Input Voltage
FIGURE 13 CIRCUIT
Tracking Start-Up
FIGURE 13 CIRCUIT
L
FIGURE 13 CIRCUIT
V
Load Step
(Pulse Skipping Mode)
OUT
5
= 3.3V
10
INPUT VOLTAGE (V)
15
20ms/DIV
20μs/DIV
LTC3826
20
25
30
2V/DIV
2V/DIV
V
V
35
OUT2
OUT1
3826 G09
3826fc
3826 G03
3826 G06
5
40