LTC3890EGN-1 LINER [Linear Technology], LTC3890EGN-1 Datasheet - Page 5

• Manufacturer Part Number: LTC3890EGN-1
• Description: 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller
• Manufacturer: LINER [Linear Technology]

100mV/DIV
PULSE-SKIPPING
TYPICAL PERFORMANCE CHARACTERISTICS
COUPLED
CONTINUOUS
2A/DIV
100
OPERATION
90
80
70
60
50
40
30
20
10
V
Burst Mode
0.0001
0
OUT
AC-
I
FORCED
Effi ciency and Power Loss
vs Output Current
FIGURE 13 CIRCUIT
L
V
V
1A/DIV
MODE
MODE
Load Step
Burst Mode Operation
IN
OUT
V
V
FIGURE 13 CIRCUIT
IN
OUT
PULSE-SKIPPING
LOSS
= 12V
= 12V
0.001
= 3.3V
= 3.3V
Inductor Current at Light Load
V
V
I
LOAD
IN
OUT
CCM LOSS
OUTPUT CURRENT (A)
= 12V
= 3.3V
= 200μA
BURST EFFICIENCY
0.01
50μs/DIV
CCM EFFICIENCY
PULSE-SKIPPING
EFFICIENCY
0.1
5μs/DIV
BURST LOSS
1
38901 G01
38901 G04
10
10000
1000
100
10
1
0.1
38901 G07
100mV/DIV
COUPLED
2A/DIV
V
OUT
AC-
I
L
100
Load Step
Pulse-Skipping Mode
90
80
70
60
50
40
30
20
10
Soft Start-Up
V
V
FIGURE 13 CIRCUIT
FIGURE 13 CIRCUIT
0.0001
0
IN
OUT
Effi ciency vs Output Current
FIGURE 13 CIRCUIT
= 12V
Burst Mode OPERATION
V
V
= 3.3V
IN
OUT
= 12V
0.001
= 8.5V
2V/DIV
V
OUTPUT CURRENT (A)
OUT2
50μs/DIV
2ms/DIV
0.01
V
OUT
2V/DIV
V
OUT1
= 3.3V
0.1
1
38901 G05
38901 G08
38901 G02
10
100mV/DIV
COUPLED
2A/DIV
V
100
OUT
AC-
98
96
94
92
90
88
86
84
82
80
I
L
0
FIGURE 13 CIRCUIT
Effi ciency vs Input Voltage
Load Step
Forced Continuous Mode
Tracking Start-Up
FIGURE 13 CIRCUIT
V
V
FIGURE 13 CIRCUIT
I
LOAD
IN
OUT
5
= 12V
= 3.3V
10
= 2A
V
OUT1
15
INPUT VOLTAGE (V)
LTC3890-1
20
2V/DIV
= 3.3V
V
OUT2
25
50μs/DIV
2ms/DIV
30 35 40 45 50 55 60
V
OUT2
2V/DIV
V
OUT1
= 8.5V
38901 G03
38901f
38901 G09
5
38901 G06