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| LTC3851_15 Datasheet, PDF (5/28 Pages) Linear Technology – Synchronous Step-Down Switching Regulator Controller | |||
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TYPICAL PERFORMANCE CHARACTERISTICS
LTC3851
Efï¬ciency and Power Loss
vs Input Voltage
100
EFFICIENCY,
95
IOUT = 5A
90
POWER LOSS,
IOUT = 5A
10000
85
80
75
70
4
EFFICIENCY,
IOUT = 0.5A
1000
POWER LOSS,
IOUT = 0.5A
8 12 16
VIN = 12V
VOUT = 3.3V
FIGURE 11 CIRCUIT
100
20 24 28 32
INPUT VOLTAGE (V)
3851 G04
Load Step
(Forced Continuous Mode)
ILOAD
5A/DIV
0.2A TO 7.5A
IL
5A/DIV
VOUT
100mV/DIV
AC-COUPLED
VOUT = 1.5V
100μs/DIV
VIN = 12V
FIGURE 11 CIRCUIT
3851 G06
Load Step
(Burst Mode Operation)
ILOAD
5A/DIV
0.2A TO 7.5A
IL
5A/DIV
VOUT
100mV/DIV
AC-COUPLED
VOUT = 1.5V
100μs/DIV
VIN = 12V
FIGURE 11 CIRCUIT
3851 G05
Load Step
(Pulse-Skip Mode)
ILOAD
5A/DIV
0.2A TO 7.5A
IL
5A/DIV
VOUT
100mV/DIV
AC-COUPLED
VOUT = 1.5V
100μs/DIV
VIN = 12V
FIGURE 11 CIRCUIT
3851 G07
Inductor Current at Light Load
Start-Up with Prebiased Output
at 2V
FORCED
CONTINOUS
MODE
5A/DIV
Burst Mode
OPERATION
5A/DIV
PULSE SKIP
MODE
5A/DIV
VOUT = 1.5V
1μs/DIV
VIN = 12V
ILOAD = 1mA
FIGURE 11 CIRCUIT
VOUT
2V/DIV
VFB
0.5V/DIV
3851 G08
TK/SS
0.5V/DIV
20ms/DIV
3851 G09
Coincident Tracking with Master
Supply
VMASTER
0.5V/DIV
VOUT
2A LOAD
0.5V/DIV
10ms/DIV
3851 G10
3851fb
5
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