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LTC3728LXCUH Datasheet Download

Part No.:
LTC3728LXCUH
Download:
Download Datasheet
Description:
[Dual, 550kHz, 2-Phase Synchronous Regulators]
File Size:
661 K
Page:
32 Pages
Logo:
Manufacturer:
LINER [ LINEAR TECHNOLOGY ]
PCB Prototype
 LTC3728LXCUH Datasheet Page:2LTC3728LXCUH Datasheet Page:3LTC3728LXCUH Datasheet Page:4LTC3728LXCUH Datasheet Page:5LTC3728LXCUH Datasheet Page:7LTC3728LXCUH Datasheet Page:8LTC3728LXCUH Datasheet Page:9LTC3728LXCUH Datasheet Page:10 
LTC3728L/LTC3728LX
TYPICAL PERFOR A CE CHARACTERISTICS
Load Regulation
0.0
2.5
NORMALIZED V
OUT
(%)
–0.1
–0.2
V
ITH
(V)
1.5
I
SENSE
(µA)
–0.3
0.5
–0.4
0
1
3
2
LOAD CURRENT (A)
Maximum Current Sense
Threshold vs Temperature
80
4
78
DROPOUT VOLTAGE (V)
RUN/SS CURRENT (µA)
V
SENSE
(mV)
76
74
72
70
–50
–25
50
25
0
75
TEMPERATURE (°C)
Soft-Start Up (Figure 13)
V
OUT
5V/DIV
V
RUN/SS
5V/DIV
I
L
2A/DIV
I
L
2A/DIV
V
IN
= 15V
V
OUT
= 5V
5ms/DIV
6
U W
FCB = 0V
V
IN
= 15V
FIGURE 13
4
3728L G13
V
ITH
vs V
RUN/SS
V
OSENSE
= 0.7V
SENSE Pins Total Source Current
100
2.0
50
0
1.0
–50
0
5
0
1
2
3
V
RUN/SS
(V)
4
5
6
3728L G14
–100
0
2
4
6
3728L G15
V
SENSE
COMMON MODE VOLTAGE (V)
Dropout Voltage vs Output Current
(Figure 14)
V
OUT
= 5V
RUN/SS Current vs Temperature
1.8
1.6
3
1.4
1.2
1.0
0.8
0.6
0.4
0.2
2
R
SENSE
= 0.015Ω
1
R
SENSE
= 0.010Ω
0
100
125
0
0.5
1.0 1.5 2.0 2.5 3.0
OUTPUT CURRENT (A)
3.5
4.0
0
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
125
3728L G17
3728L G18
3728L
G25
Load Step (Figure 13)
Load Step (Figure 13)
V
OUT
200mV/DIV
V
OUT
200mV/DIV
I
L
2A/DIV
3728L G19
V
IN
= 15V
20µs/DIV
V
OUT
= 5V
V
PLLFLTR
= 0V
LOAD STEP = 0A TO 3A
Burst Mode OPERATION
3728L G20
20µs/DIV
V
IN
= 15V
V
OUT
= 5V
V
PLLFLTR
= 0V
LOAD STEP = 0A TO 3A
CONTINUOUS MODE
3728L G21
3728lxfa