ltc3869gn-2 Linear Technology Corporation, ltc3869gn-2 Datasheet - Page 5

• Manufacturer Part Number: ltc3869gn-2
• Description: Ltc3869/ltc3869-2 - Dual, 2-phase Synchronous Step-down Dc/dc Controllers
• Manufacturer: Linear Technology Corporation

TYPICAL PERFORMANCE CHARACTERISTICS
CONTINUOUS
300mA TO 5A
OPERATION
AC-COUPLED
Burst Mode
100mV/DIV
SKIPPING
FORCED
100
PULSE-
5A/DIV
5A/DIV
5A/DIV
90
80
70
60
50
40
30
20
10
5A/DIV
5A/DIV
MODE
MODE
0
0.01
I
V
LOAD
Efficiency vs Output Current
and Mode
OUT
I
L
OPERATION
Burst Mode
V
V
I
Load Step
(Burst Mode Operation)
V
V
Inductor Current at Light Load
LOAD
IN
OUT
IN
OUT
= 12V
= 12V
= 1.8V
= 1.8V
= 400mA
0.1
DCM
LOAD CURRENT (A)
CCM
50µs/DIV
1
1µs/DIV
CIRCUIT OF FIGURE 16
10
V
V
IN
OUT
= 12V
= 1.8V
3869 G01
3869 G07
100
3869 G04
300mA TO 5A
AC-COUPLED
500mV/DIV
500mV/DIV
100mV/DIV
100
2V/DIV
90
80
70
60
50
40
30
20
10
5A/DIV
5A/DIV
TK/SS
V
0
I
0.01
V
LOAD
OUT
V
OUT
Efficiency vs Output Current
and Mode
FB
I
L
OPERATION
Burst Mode
V
V
Prebiased Output at 2V
V
V
Load Step
(Forced Continuous Mode)
IN
OUT
IN
OUT
= 12V
= 12V
= 3.3V
= 1.8V
0.1
DCM
LOAD CURRENT (A)
CCM
50µs/DIV
2ms/DIV
CIRCUIT OF FIGURE 16
1
V
V
10
IN
OUT
= 12V
= 1.2V
3869 G02
T
A
3869 G08
3869 G05
100
= 25°C, unless otherwise noted.
LTC3869/LTC3869-2
300mA TO 5A
AC-COUPLED
100mV/DIV
90
85
80
75
2V/DIV
1V/DIV
V
V
5A/DIV
5A/DIV
5
Full Load Efficiency and Power
Loss vs Input Voltage
RUN
OUT1
OUT2
I
LOAD
V
CIRCUIT OF FIGURE 16
OUT
I
L
Coincident Tracking
Load Step
(Pulse-Skipping Mode)
V
V
V
V
1.8V
POWER LOSS
OUT1
OUT2
IN
OUT
1.2V
= 12V
= 1.8V
EFFICIENCY
= 1.8V, 1.5 LOAD
= 1.2V, 1 LOAD
INPUT VOLTAGE (V)
10
1.8V
1.2V
50µs/DIV
5ms/DIV
15
V
V
OUT1
OUT2
3869 G03
20
5
3869 G09
3869 G06
3869f
5
4
3
2