LTC3882_15 Datasheet, PDF (9/104 Pages) Linear Technology – Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management

TYPICAL PERFORMANCE CHARACTERISTICS
LTC3882
3-Phase DC Output Current
Sharing (Using DS12S1R845A
Power Block
20
CHANNEL 1
18
CHANNEL 2
16
CHANNEL 3
Load Step Transient Current
Sharing (Using FDMF6707B
DrMOS)
I_OUT
20A/DIV
14
V_OUT
12
20mV/DIV
10
I_L1, I_L2
10A/DIV
8
6
4
2
0
0 10 20 30 40 50 60 70 80
TOTAL RAIL CURRENT (A)
3882 G04
V_OUT = 1V
V_IN = 12V
SYNC = 500kHz
L = 320nH
5µs/DIV
3882 G05
3+1 Channel Crosstalk
(Using DS12S1R845A Power
Blocks)
Load Step Transient Response
Using AVP
Load Dump Transient Current
Sharing (Using FDMF6707B
DrMOS)
I_OUT
20A/DIV
V_OUT
20mV/DIV
I_L1, I_L2
10A/DIV
V_OUT = 1V
V_IN = 12V
SYNC = 500kHz
L = 320nH
5µs/DIV
3882 G06
Line Step Transient Response
(1-phase Using LTC4449)
V_OUT0
(1-PHASE)
20mV/DIV
V_OUT1
(3-PHASE)
20mV/DIV
I_OUT1
10A/DIV
I_O
10A/DIV
100µs/DIV
25%
LOAD STEP
3882 G07
V_OUT
50mV/DIV
200µs/DIV
V_IN ^7V
2V/DIV
1.8V
V_OUT
10mV/DIV
3882 G08
200µs/DIV
3882 G09
Soft-Start Ramp
V_OUT
0.5V/DIV
I_L1, I_L2
10A/DIV
V_IN = 12V
1ms/DIV
Start-Up Into a Prebiased Load
Soft-Off Ramp
V_OUT
0.5V/DIV
0V
I_L1, I_L2
10A/DIV
3882 G10
V_IN = 12V
1ms/DIV
RUN
2V/DIV
V_OUT
1V/DIV
3882 G11
5ms/DIV
TOFF_DELAY = 10ms
TOFF_FALL = 5ms
3882 G12
3882f
For more information www.linear.com/LTC3882
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