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| LTC3807_15 Datasheet, PDF (6/32 Pages) Linear Technology – Low IQ, Synchronous Step-Down Controller with 24V Output Voltage Capability | |||
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LTC3807
TYPICAL PERFORMANCE CHARACTERISTICS
Load Step
Burst Mode Operation
Load Step
Pulse-Skipping Mode
VOUT
100mV/DIV
AC-
COUPLED
VOUT
100mV/DIV
AC-
COUPLED
Load Step
Forced Continuous Mode
VOUT
100mV/DIV
AC-
COUPLED
IL
2A/DIV
50µs/DIV
LOAD STEP = 100mA TO 3A
VIN = 12V
VOUT = 3.3V
FIGURE 12 CIRCUIT
3807 G04
IL
2A/DIV
50µs/DIV
LOAD STEP = 100mA TO 3A
VIN = 12V
VOUT = 3.3V
FIGURE 12 CIRCUIT
3807 G05
IL
2A/DIV
50µs/DIV
LOAD STEP = 100mA TO 3A
VIN = 12V
VOUT = 3.3V
FIGURE 12 CIRCUIT
3807 G06
Inductor Current at Light Load
FORCED
CONTINUOUS
MODE
Burst Mode
OPERATION
1A/DIV
PULSE-SKIPPING
MODE
VIN = 12V
VOUT = 3.3V
ILOAD = 200µA
5µs/DIV
3807 G07
Soft Start-Up
VOUT = 8.5V
2V/DIV
VOUT = 3.3V
2V/DIV
2ms/DIV
FIGURES 12, 14 CIRCUITS
3807 G08
Tracking Start-Up
MASTER
2V/DIV
VOUT 2V/DIV
2ms/DIV
FIGURE 12, 14 CIRCUITS
TRACKING RESISTORS ADDED
TO FIGURE 12 CIRCUIT
3807 G09
Efficiency vs Output Current
100
Burst Mode OPERATION
90
80
70
60
50
40
FC Mode
PULSE SKIP
30
Mode
20
10
0
0.0001 0.001
VIN = 24V
VOUT = 12V
FIGURE 13 CIRCUIT
0.01 0.1
IOUT (A)
1
10
3807 G28
Load Step
Forced Continuous Mode
VOUT
500mV/DIV
AC-
COUPLED
IL
5A/DIV
100µs/DIV
LOAD STEP = 300mA TO 7A
VIN = 24V
VOUT = 12V
FIGURE 13 CIRCUIT
3807 G29
Start-Up
RUN
5V/DIV
PGOOD
5V/DIV
VOUT
5V/DIV
2ms/DIV
VIN = 24V
VOUT = 12V
FIGURE 13 CIRCUIT
6
For more information www.linear.com/LTC3807
3807 G30
3807f
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