Datasheet

LTC3828
6
3828fc
TYPICAL PERFORMANCE CHARACTERISTICS
Current Sense Threshold vs
I
TH
Voltage
Dropout Voltage vs Output Current
(Figure 14)
SENSE Pins Total Source Current
Soft Start-Up
(Figure 14, with Coincident
Tracking)
V
ITH
(V)
0
V
SENSE
(mV)
80
70
60
50
40
30
20
10
0
–10
–20
2.0
3828 G16
0.5
1.0
1.5
2.5
OUTPUT CURRENT (A)
0
DROPOUT VOLTAGE (V)
4.0
3828 G17
1.00.5 1.5 2.5 3.5
2.0
3.0
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V
SENSE
COMMON MODE VOLTAGE (V)
01
I
SENSE
(µA)
243
5
6
3828 G18
100
50
0
–50
–100
Soft Start-Up
(Figure 14, with Ratiometric
Tracking)
Soft Start-Up
(Figure 14, with Internal Soft
Start-Up)
3828 G19
V
OUT1
1V/DIV
V
OUT2
1V/DIV
5ms/DIV
V
IN
= 12V
V
OUT1
= 5V
V
OUT2
= 3.3V
3828 G20
V
OUT1
1V/DIV
V
OUT2
1V/DIV
2ms/DIV
V
IN
= 12V
V
OUT1
= 5V
V
OUT2
= 3.3V
3828 G21
V
OUT1
1V/DIV
V
OUT2
1V/DIV
100µs/DIV
V
IN
= 12V
V
OUT1
= 5V
V
OUT2
= 3.3V
T
A
= 25°C unless otherwise noted.
Maximum Current Sense
Threshold vs Duty Factor
Maximum Current Sense
Threshold vs Percent of Nominal
Output Voltage (Foldback)
Maximum Current Sense
Threshold vs Sense Common
Mode Voltage
PERCENT ON NOMINAL OUTPUT VOLTAGE (%)
0
V
SENSE
(mV)
0.75
3828 G14
0.25 0.5 1.0
80
70
60
50
40
30
20
10
0
DUTY FACTOR (%)
0
V
SENSE
(mV)
50
75
3828 G13
25
0
20
40
100
60
80
COMM0N MODE VOLTAGE (V)
0
V
SENSE
(mV)
70
75
4
3828 G15
65
60
1
2
3
5
80