LTC3728LX Linear Technology, LTC3728LX Datasheet - Page 7

• Manufacturer Part Number: LTC3728LX
• Description: 2-Phase Synchronous Regulators
• 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
OUT1
PLLFLTR
= 5V
= 15V
= I
= 5V, V
OUT3.3
= 0V
0
TEMPERATURE ( C)
OUT2
3.20
3.50
3.45
3.40
3.35
3.30
3.25
= 2A
25
= 3.3V
–50
Undervoltage Lockout
vs Temperature
1 s/DIV
50
–25
75
W
0
TEMPERATURE ( C)
100
3728L G26
25
U
3728L G22
125
50
75
20mV/DIV
0.5A/DIV
10
V
6
8
4
2
0
100
–50 –25
OUT
I
EXTV
vs Temperature
3728L G29
L
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
10 s/DIV
50
75
4.5
3.5
3.0
2.5
2.0
1.0
4.0
1.5
0.5
0
100
–50
3728L G27
Shutdown Latch Thresholds
vs Temperature
3728L G23
LTC3728L/LTC3728LX
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
3728L G30
V
V
25
V
PLLFLTR
PLLFLTR
PLLFLTR
125
2 s/DIV
50
= 2.4V
= 1.2V
= 0V
75
100
3728L G28
3728lxfa
7
3728L G24
125