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LTC3728LEGN#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P38
LTC3728L/LTC3728LX
7
3728lxff
Typical perForMance characTerisTics
Maximum Current Sense Threshold
vs V
RUN/SS
(Soft-Start)
Maximum Current Sense Threshold
vs Sense Common Mode Voltage
Current Sense Threshold
vs I
TH
Voltage
Load Regulation
V
ITH
vs V
RUN/SS
SENSE Pins Total Source Current
Maximum Current Sense
Threshold vs Temperature
Dropout Voltage vs Output Current
(Figure 14)
RUN/SS Current vs Temperature
V
RUN/SS
(V)
0
0
V
SENSE
(mV)
20
40
60
80
1 2 3 4
3728L G10
5 6
V
SENSE(CM)
= 1.6V
COMMON MODE VOLTAGE (V)
0
V
SENSE
(mV)
72
76
80
4
3728L G11
68
64
60
1
2
3
5
V
ITH
(V)
0
V
SENSE
(mV)
30
50
70
90
2
3728L G12
10
–10
20
40
60
80
0
–20
–30
0.5
1
1.5
2.5
LOAD CURRENT (A)
0
NORMALIZED V
OUT
(%)
–0.2
–0.1
4
3728L G13
–0.3
–0.4
1
2
3
5
0.0
FCB = 0V
V
IN
= 15V
FIGURE 13
V
RUN/SS
(V)
0
0
V
ITH
(V)
0.5
1.0
1.5
2.0
2.5
1
2 3 4
3728L G14
5 6
V
OSENSE
= 0.7V
V
SENSE
COMMON MODE VOLTAGE (V)
0
I
SENSE
(µA)
0
3728L G15
–50
–100
2 4
50
100
6
TEMPERATURE (°C)
–50 –25
70
V
SENSE
(mV)
74
80
0
50
75
3728L G17
72
78
76
25
100
125
OUTPUT CURRENT (A)
0
0
DROPOUT VOLTAGE (V)
1
2
3
4
0.5 1.0 1.5 2.0
3728L G18
2.5 3.0 3.5 4.0
R
SENSE
= 0.015Ω
R
SENSE
= 0.010Ω
V
OUT
= 5V
TEMPERATURE (°C)
–50 –25
0
RUN/SS CURRENT (µA)
0.2
0.6
0.8
1.0
75 10050
1.8
3728L G25
0.4
0 25 125
1.2
1.4
1.6
LTC3728L/LTC3728LX
8
3728lxff
Typical perForMance characTerisTics
Soft-Start Up (Figure 13)
Load Step (Figure 13)
Load Step (Figure 13)
Input Source/Capacitor
Instantaneous Current (Figure 13)
Burst Mode Operation (Figure 13)
Constant-Frequency (Burst Inhibit)
Operation (Figure 13)
3728L G19
V
OUT
5V/DIV
V
RUN/SS
5V/DIV
I
L
2A/DIV
5ms/DIVV
IN
= 15V
V
OUT
= 5V
3728L G20
V
OUT
200mV/DIV
I
L
2A/DIV
20µs/DIVV
IN
= 15V
V
OUT
= 5V
V
PLLFLTR
= 0V
LOAD STEP = 0A TO 3A
Burst Mode OPERATION
3728L G21
V
OUT
200mV/DIV
I
L
2A/DIV
20µs/DIVV
IN
= 15V
V
OUT
= 5V
V
PLLFLTR
= 0V
LOAD STEP = 0A TO 3A
CONTINUOUS MODE
3728L G22
V
IN
200mV/DIV
V
SW1
10V/DIV
V
SW2
10V/DIV
I
IN
2A/DIV
1µs/DIVV
IN
= 15V
V
OUT1
= 5V, V
OUT2
= 3.3V
V
PLLFLTR
= 0V
I
OUT5
= I
OUT3.3
= 2A
3728L G23
V
OUT
20mV/DIV
I
L
0.5A/DIV
10µs/DIVV
IN
= 15V
V
OUT
= 5V
V
PLLFLTR
= 0V
V
FCB
= OPEN
I
OUT
= 20mA
3728L G24
V
OUT
20mV/DIV
I
L
0.5A/DIV
2µs/DIVV
IN
= 15V
V
OUT
= 5V
V
PLLFLTR
= 0V
V
FCB
= 5V
I
OUT
= 20mA
LTC3728L/LTC3728LX
9
3728lxff
Typical perForMance characTerisTics
Current Sense Pin Input Current
vs Temperature
EXTV
CC
Switch Resistance
vs Temperature
Oscillator Frequency
vs Temperature
Undervoltage Lockout
vs Temperature
Shutdown Latch Thresholds
vs Temperature
TEMPERATURE (°C)
–50 –25
25
CURRENT SENSE INPUT CURRENT (µA)
29
35
0
50
75
3728L G26
27
33
31
25
100
125
V
OUT
= 5V
TEMPERATURE (°C)
–50 –25
0
EXTV
CC
SWITCH RESISTANCE (Ω)
4
10
0
50
75
3728L G27
2
8
6
25
100
125
TEMPERATURE (°C)
–50
400
500
700
25 75
3728L G28
300
200
–25 0
50 100 125
100
0
600
FREQUENCY (kHz)
V
PLLFLTR
= 2.4V
V
PLLFLTR
= 1.2V
V
PLLFLTR
= 0V
TEMPERATURE (°C)
–50
UNDERVOLTAGE LOCKOUT (V)
3.40
3.45
3.50
25 75
3728L G29
3.35
3.30
–25 0
50 100 125
3.25
3.20
TEMPERATURE (°C)
–50 –25
0
SHUTDOWN LATCH THRESHOLDS (V)
0.5
1.5
2.0
2.5
75 10050
4.5
3728L G30
1.0
0 25 125
3.0
3.5
4.0
LATCH ARMING
LATCHOFF
THRESHOLD
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P38

LTC3728LEGN#TRPBF

Mfr. #:
Buy LTC3728LEGN#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 2x, 550kHz, 2-PhSync Regs
Lifecycle:
New from this manufacturer.
Delivery:
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