LTC3851A-1_15 Datasheet, PDF (5/30 Pages) Linear Technology – Synchronous Step-Down Switching Regulator Controller

Typical Performance Characteristics
LTC3851A-1
Efficiency vs Output Current
and Mode
100
V_IN = 12V
90 V_OUT = 1.5V
80
BURST
70
60
PULSE
SKIP
50
40
CCM
30
20
10
0
10
100
1000 10000 100000
LOAD CURRENT (mA)
3851A1 G01
Efficiency vs Output Current
and Mode
100
90
80
BURST
70
60 ^PULSE
SKIP
50
CCM
40
30
20
10
0
10
V_IN = 12V
V_OUT = 5V
100
1000 10000
LOAD CURRENT (mA)
100000
3851A1 G03
Load Step
(Burst Mode Operation)
I_LOAD
5A/DIV
0.2A TO 7.5A
I_L
5A/DIV
V_OUT
100mV/DIV
AC-COUPLED
V_OUT = 1.5V
100µs/DIV
V_IN = 12V
FIGURE 11 CIRCUIT
3851A1 G05
Efficiency vs Output Current
and Mode
100
90
BURST
80
70
60
PULSE
50
SKIP
CCM
40
30
20
10
0
10
V_IN = 12V
V_OUT = 3.3V
FIGURE 11 CIRCUIT
100
1000 10000
LOAD CURRENT (mA)
100000
3851A1 G02
Efficiency and Power Loss
vs Input Voltage
100
EFFICIENCY,
95
I_OUT = 5A
90
POWER LOSS,
I_OUT = 5A
10000
85
80
75
70
4
EFFICIENCY,
I_OUT = 0.5A
1000
POWER LOSS,
I_OUT = 0.5A
8 12 16
V_IN = 12V
V_OUT = 3.3V
FIGURE 11 CIRCUIT
100
20 24 28 32
INPUT VOLTAGE (V)
3851A1 G04
Load Step
(Forced Continuous Mode)
I_LOAD
5A/DIV
0.2A TO 7.5A
I_L
5A/DIV
V_OUT
100mV/DIV
AC-COUPLED
V_OUT = 1.5V
100µs/DIV
V_IN = 12V
FIGURE 11 CIRCUIT
3851A1 G06
3851a1fa
5