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| LTC3736_15 Datasheet, PDF (4/28 Pages) Linear Technology – Dual 2-Phase, No RSENSE, Synchronous Controller with Output Tracking | |||
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LTC3736
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted.
Efficiency and Power Loss
vs Load Current
Load Step (Burst Mode Operation)
Load Step
(Forced Continuous Mode)
100
FIGURE 15 CIRCUIT
95
90
85
10
VOUT
AC-COUPLED
1
100mV/DIV
VOUT
AC-COUPLED
100mV/DIV
80
75
0.1
70
IL
2A/DIV
65
VOUT = 3.3V
VOUT = 2.5V 0.01
60
VOUT = 1.8V
55
VIN = 5V
VOUT = 1.2V
SYNC/FCB = VIN
50
0.001
1
10
100
1000 10000
VIN = 3.3V
100µs/DIV
VOUT = 1.8V
ILOAD = 300mA TO 3A
SYNC/FCB = VIN
FIGURE 17 CIRCUIT
LOAD CURRENT (mA)
IL
2A/DIV
3736 G02
VIN = 3.3V
100µs/DIV
VOUT = 1.8V
ILOAD = 300mA TO 3A
SYNC/FCB = 0V
FIGURE 17 CIRCUIT
3736 G01
3736 G03
Load Step (Pulse Skipping Mode)
Inductor Current at Light Load
VOUT
AC-COUPLED
100mV/DIV
IL
2A/DIV
VIN = 3.3V
100µs/DIV
VOUT = 1.8V
ILOAD = 300mA TO 3A
SYNC/FCB = 550kHz EXTERNAL CLOCK
FIGURE 17 CIRCUIT
3736 G04
Burst Mode
OPERATION
SYNC/FCB = VIN
FORCED
CONTINUOUS
MODE
SYNC/FCB = 0V
PULSE
SKIPPING MODE
SYNC/FCB = 550kHz
VIN = 3.3V
4µs/DIV
VOUT = 1.8V
ILOAD = 200mA
FIGURE 17 CIRCUIT
IL
1A/DIV
3736 G05
Tracking Start-Up with Internal
Soft-Start (CSS = 0µF)
VOUT1
2.5V
VOUT2
1.8V
500mV/
DIV
Tracking Start-Up with External
Soft-Start (CSS = 0.15µF)
VOUT1
2.5V
VOUT2
1.8V
500mV/
DIV
VIN = 5V
200µs/DIV
RLOAD1 = RLOAD2 = 1â¦
FIGURE 15 CIRCUIT
3736 G06
VIN = 5V
40ms/DIV
RLOAD1 = RLOAD2 = 1â¦
FIGURE 15 CIRCUIT
3736 G07
Oscillator Frequency
vs Input Voltage
5
4
3
2
1
0
â1
â2
â3
â4
â5
23 4 56 78
INPUT VOLTAGE (V)
9 10
3736 G08
3736fa
4
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