LTC3892_15 Datasheet, PDF (7/36 Pages) Linear Technology – 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller

Typical Performance Characteristics
LTC3892/LTC3892-1
Efficiency and Power Loss
vs Load Current
100
10k
BURST EFFICIENCY
90
80
1k
70
FCM LOSS
60
100
50 _PULSE-
40
SKIPPING
LOSS
30
20
10
0
0.0001 0.001 0.01
V_IN = 12V
V_OUT = 5V ₁₀
FIGURE 11 CIRCUIT
BURST LOSS
PULSE-SKIPPING
1
EFFICIENCY
FCM EFFICIENCY
0.1
0.1
1
10
LOAD CURRENT (A)
3892 G01
Load Step
Burst Mode Operation
Efficiency vs Output Current
100
90
80
70
60
50
40
30
20 _{FIGURE 11 CIRCUIT}
10 ^VOUT ^{= 5V}
Burst Mode OPERATION
0
0.0001 0.001 0.01 0.1
LOAD CURRENT (A)
V_IN = 10V
V_IN = 20V
V_IN = 30V
V_IN = 40V
V_IN = 50V
V_IN = 60V
1
10
3892 G02
Efficiency vs Input Voltage
96
95
94
93
92
DRVSET=INTV_CC
91
DRVSET=0V
90
89
88 _{FIGURE 11 CIRCUIT}
87 ^{VOUT = 5V}
I_LOAD=8A
86
0 5 10 15 20 25 30 35 40 45 50 55 60
INPUT VOLTAGE (V)
3892 G03
Load Step
Pulse-Skipping Mode
Load Step
Forced Continuous Mode
V_OUT
100mV/DIV
AC COUPLED
I_L
2A/DIV
V_OUT
100mV/DIV
AC COUPLED
I_L
2A/DIV
V_OUT
100mV/DIV
AC COUPLED
I_L
2A/DIV
50µs/DIV
V_IN = 12V
V_OUT = 5V
FIGURE 13 CIRCUIT
3892 G04
50µs/DIV
V_IN = 12V
V_OUT = 5V
FIGURE 13 CIRCUIT
3892 G05
50µs/DIV
V_IN = 12V
V_OUT = 5V
FIGURE 13 CIRCUIT
3892 G06
Inductor Current at Light Load
FORCED
CONTINUOUS
MODE
Burst Mode
OPERATION
1A/DIV
PULSE
SKIPPING
MODE
2µs/DIV
V_IN = 12V
V_OUT = 5V
I_LOAD = 1mA
FIGURE 13 CIRCUIT
3892 G07
Soft Start-Up
2ms/DIV
FIGURE 13 CIRCUIT
RUN1, 2
5V/DIV
V_OUT2
2V/DIV
V_OUT1
2V/DIV
3892 G08
For more information www.linear.com/LTC3892
Regulated Feedback Voltage vs
Temperature
808
806
804
802
800
798
796
794
792
-75 -50 -25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3892 G09
38921f
7