ltc3853euj Linear Technology Corporation, ltc3853euj Datasheet - Page 5

• Manufacturer Part Number: ltc3853euj
• Description: Triple Output, Multiphase Synchronous Step-down Controller
• Manufacturer: Linear Technology Corporation

TYPICAL PERFORMANCE CHARACTERISTICS
100
1.00E-02
90
80
70
60
50
40
30
20
10
0
Effi ciency vs Output Current
and Mode
BURST
DCM
1.00E-01
LOAD CURRENT (mA)
AC COUPLED
AC COUPLED
100mV/DIV
100mV/DIV
CCM
2A/DIV
2A/DIV
2A/DIV
2A/DIV
I
I
V
V
LOAD
LOAD
OUT
OUT
V
V
FIGURE 15 MODIFIED
WITH DCR SENSING
I
I
IN
OUT
L
L
1.00E+00
Load Step
(Pulse Skip Mode)
Load Step
(Burst Mode Operation)
V
V
I
FIGURE 15 CIRCUIT
V
V
I
FIGURE 15 CIRCUIT
= 12V
LOAD
LOAD
IN
OUT
IN
OUT
= 1.8V
= 12V
= 12V
= 3.3V
= 3.3V
= 0A TO 3A
= 0A TO 3A
3853 G01
1.00E+01
40μs/DIV
40μs/DIV
100
1.00E-02
90
80
70
60
40
30
20
10
50
0
Effi ciency vs Output Current
and Mode
BURST
DCM
3853 G04
3853 G06
1.00E-01
LOAD CURRENT (mA)
CCM
V
V
FIGURE 15 MODIFIED
WITH DCR SENSING
IN
OUT
1.00E+00
= 12V
PULSE SKIPPING
= 3.3V
CONTINUOUS
AC COUPLED
OPERATION
100mV/DIV
Burst Mode
FORCED
2A/DIV
2A/DIV
MODE
2A/DIV
2A/DIV
MODE
2A/DIV
3853 G02
I
V
1.00E+01
LOAD
OUT
I
L
Inductor Current at Light Load
Load Step
(Forced Continuous Mode)
V
V
I
FIGURE 15 CIRCUIT
V
V
I
FIGURE 15 CIRCUIT
LOAD
LOAD
IN
OUT
IN
OUT
= 12V
= 12
= 3.3V
= 1.8V
= 0A TO 3A
= 100mA
100
95
90
80
75
70
60
85
65
0
Effi ciency and Power Loss
vs Input Voltage
40μs/DIV
1μs/DIV
5
POWER LOSS
EFFICIENCY
INPUT VOLTAGE (V)
10
15
V
I
FIGURE 15 MODIFIED
WITH DCR SENSING
OUT
OUT
= 2A
LTC3853
3853 G05
3853 G07
= 3.3V
20
25
3853 G03
30
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0
0.2
5
3853f