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| LTC3736-2 Datasheet, PDF (4/28 Pages) Linear Technology – Dual 2-Phase, No RSENSE Synchronous Controller with Output Tracking | |||
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LTC3736-2
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted.
Efficiency and Power Loss
vs Load Current
100
10
VOUT = 2.5V
95
90
EFFICIENCY
1
85
80
75
0.1
POWER LOSS
70
65
0.01
60
55
VIN = 3.3V
VIN = 5V
50
0.001
1
10
100
1000 10000
LOAD CURRENT (mA)
37362 G01
Load Step
(Forced Continuous Mode)
VOUT
AC-COUPLED
100mV/DIV
IL
2A/DIV
VIN = 3.3V
100µs/DIV
VOUT = 1.8V
ILOAD = 300mA TO 3A
SYNC/FCB = 0V
FIGURE 15 CIRCUIT
37362 G03
Load Step (Pulse-Skipping Mode)
Light Load
(Pulse-Skipping Mode)
Light Load
(Forced Continuous Mode)
VOUT
AC-COUPLED
100mV/DIV
IL
2A/DIV
VIN = 3.3V
100µs/DIV
VOUT = 1.8V
ILOAD = 300mA TO 3A
SYNC/FCB = VIN
FIGURE 15 CIRCUIT
SW
5V/DIV
VOUT
50mV/DIV
AC COUPLED
IL
2A/DIV
37362 G04
VIN = 5V
2.5µs/DIV
VOUT = 2.5V
ILOAD = 300mA
SYNC/FBC = VIN
FIGURE 15 CIRCUIT
SW
5V/DIV
VOUT
50mV/DIV
AC COUPLED
IL
2A/DIV
37362 G02
VIN = 5V
VOUT = 2.5V
ILOAD = 300mA
SYNC/FCB = 0V
2.5µs/DIV
FIGURE 15 CIRCUIT
37362 G05
Tracking Start-Up with Internal
Soft-Start (CSS = 0µF)
Tracking Start-Up with External
Soft-Start (CSS = 0.10µF)
500mV/
DIV
VOUT1
2.5V
VOUT2
1.8V 500mV/
DIV
VOUT1
2.5V
VOUT2
1.8V
VIN = 5V
200µs/DIV
RLOAD1 = RLOAD2 = 1â¦
FIGURE 15 CIRCUIT
37362 G06
VIN = 5V
40ms/DIV
RLOAD1 = RLOAD2 = 1â¦
FIGURE 15 CIRCUIT
37362 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
37368 G08
37362fa
4
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