LTC3728 Linear Technology, LTC3728 Datasheet - Page 7

• Manufacturer Part Number: LTC3728
• Description: 2-Phase Synchronous Step-Down Switching Regulator
• Manufacturer: Linear Technology

TYPICAL PERFOR A CE CHARACTERISTICS
200mV/DIV
10V/DIV
10V/DIV
2A/DIV
31
35
33
29
27
25
V
V
–50 –25
SW1
SW2
V
Current Sense Pin Input Current
vs Temperature
I
IN
IN
V
OUT
Input Source/Capacitor
Instantaneous Current (Figure 13)
V
V
V
I
OUT5
IN
OUT
PLLFLTR
= 5V
= 15V
= 5V
= I
OUT3.3
= 0V
0
TEMPERATURE (°C)
3.20
3.50
3.45
3.40
3.35
3.30
3.25
= 2A
25
–50
Undervoltage Lockout
vs Temperature
1µs/DIV
50
–25
75
W
0
TEMPERATURE (°C)
100
3728 G26
25
U
125
3728 G22
50
75
20mV/DIV
0.5A/DIV
10
V
6
8
4
2
0
100
–50 –25
OUT
I
EXTV
vs Temperature
L
3728 G29
Burst Mode Operation (Figure 13)
V
V
V
V
I
OUT
125
IN
OUT
PLLFLTR
FCB
= 15V
CC
= 20mA
= OPEN
= 5V
Switch Resistance
= 0V
0
TEMPERATURE (°C)
25
10µs/DIV
50
75
4.5
3.5
3.0
2.5
2.0
1.0
4.0
1.5
0.5
0
100
–50
Shutdown Latch Thresholds
vs Temperature
3728 G27
3728 G23
125
–25
0
TEMPERATURE (°C)
20mV/DIV
0.5A/DIV
THRESHOLD
700
400
600
500
300
200
LATCHOFF
100
25
V
0
OUT
– 50
I
Oscillator Frequency
vs Temperature
LATCH ARMING
L
50
V
V
V
V
I
Constant Frequency (Burst Inhibit)
Operation (Figure 13)
OUT
IN
OUT
PLLFLTR
FCB
– 25
= 15V
= 20mA
= 5V
= 5V
75
= 0V
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0
TEMPERATURE (°C)
100
3728 G30
V
25
V
V
PLLFLTR
PLLFLTR
PLLFLTR
125
LTC3728
2µs/DIV
50
= 1.2V
= 5V
= 0V
75
100
3728 G28
3728fb
7
3728 G24
125