ltc3728legn-trpbf Linear Technology Corporation, ltc3728legn-trpbf Datasheet - Page 7

• Manufacturer Part Number: ltc3728legn-trpbf
• Description: Dual, 550khz, 2-phase Synchronous Step-down Switching Regulator
• Manufacturer: Linear Technology Corporation

TYPICAL PERFORMANCE CHARACTERISTICS
200mV/DIV
V
5V/DIV
RUN/SS
5V/DIV
2A/DIV
10V/DIV
10V/DIV
V
2A/DIV
OUT
31
25
V
V
35
33
29
27
I
SW1
SW2
L
V
–50 –25
I
IN
IN
Soft-Start Up (Figure 13)
Current Sense Pin Input Current
vs Temperature
V
V
V
IN
OUT
Input Source/Capacitor
Instantaneous Current (Figure 13)
V
V
V
I
OUT
OUT
= 15V
IN
OUT
PLLFLTR
= 5V
= 15V
= 5V
= I
= 5V
OUT3.3A
= 0V
0
TEMPERATURE (°C)
= 2A
25
5ms/DIV
1μs/DIV
50
75
100
3728 G26
3728 G19
3728 G22
125
200mV/DIV
20mV/DIV
0.5A/DIV
2A/DIV
V
V
OUT
OUT
10
8
6
4
2
0
I
I
L
L
–50 –25
Load Step (Figure 13)
Burst Mode Operation (Figure 13)
EXTV
Temperature
V
V
V
LOAD STEP = 0A to 3A
Burst Mode OPERATION
V
V
V
V
I
OUT
IN
OUT
PLLFLTR
IN
OUT
PLLFLTR
FCB
= 15V
= 15V
= 20mA
= OPEN
= 5V
= 5V
CC
= 0V
= 0V
Switch Resistance vs
0
TEMPERATURE (°C)
25
20μs/DIV
10μs/DIV
50
75
100
3728 G27
3728 G20
3728 G23
125
200mV/DIV
20mV/DIV
0.5A/DIV
2A/DIV
V
V
700
600
500
400
300
200
100
OUT
OUT
0
I
I
–50
L
L
Load Step (Figure 13)
Constant Frequency (Burst
Inhibit) Operation (Figure 13)
Oscillator Frequency vs
Temperature
V
V
V
LOAD STEP = 0A to 3A
CONTINUOUS OPERATION
V
V
V
V
I
OUT
IN
OUT
PLLFLTR
IN
OUT
PLLFLTR
FCB
–25
= 15V
= 15V
= 20mA
= 5V
= 5V
= 5V
= 0V
= 0V
0
TEMPERATURE (°C)
V
25
V
V
PLLFLTR
20μs/DIV
2μs/DIV
PLLFLTR
PLLFLTR
LTC3728
50
= 1.2V
= 5V
= 0V
75
100
3728 G28
3728 G21
3728 G24
3728fd
7
125