LTC3828_15 Datasheet, PDF (6/32 Pages) Linear Technology – Dual, 2-Phase Step-Down Controller with Tracking

LTC3828
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C unless otherwise noted.
Maximum Current Sense
Threshold vs Duty Factor
75
50
25
0
0
20
40
60
80 100
DUTY FACTOR (%)
3828 G13
Current Sense Threshold vs
I_TH Voltage
80
70
60
50
40
30
20
10
0
–10
–20
0
0.5 1.0 1.5 2.0
V_ITH (V)
2.5
3828 G16
Soft Start-Up
(Figure 14, with Coincident
Tracking)
Maximum Current Sense
Threshold vs Percent of Nominal
Output Voltage (Foldback)
80
70
60
50
40
30
20
10
0
0
0.25
0.5
0.75
1.0
PERCENT ON NOMINAL OUTPUT VOLTAGE (%)
3828 G14
Dropout Voltage vs Output Current
(Figure 14)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT CURRENT (A)
3828 G17
Soft Start-Up
(Figure 14, with Ratiometric
Tracking)
Maximum Current Sense
Threshold vs Sense Common
Mode Voltage
80
75
70
65
60
0
1
2
3
4
5
COMM0N MODE VOLTAGE (V)
3828 G15
SENSE Pins Total Source Current
100
50
0
–50
–100
0
1
2
3
4
5
6
V_SENSE COMMON MODE VOLTAGE (V)
3828 G18
Soft Start-Up
(Figure 14, with Internal Soft
Start-Up)
V_OUT1
1V/DIV
V_OUT2
1V/DIV
V_OUT1
1V/DIV
V_OUT2
1V/DIV
V_OUT1
1V/DIV
V_OUT2
1V/DIV
V_IN = 12V
V_OUT1 = 5V
V_OUT2 = 3.3V
5ms/DIV
3828 G19
6
V_IN = 12V
V_OUT1 = 5V
V_OUT2 = 3.3V
2ms/DIV
3828 G20
V_IN = 12V
V_OUT1 = 5V
V_OUT2 = 3.3V
100μs/DIV
3828 G21
3828fc