LTC3773 Datasheet, PDF (6/32 Pages) Linear Technology – Triple Output Synchronous 3-Phase DC/DC Controller with Up/Down Tracking

LTC3773
TYPICAL PERFORMANCE CHARACTERISTICS
I_VDR and I_VCC vs Switching Frequency
120 _{VIN = 10V, VCC = VDR = 5V,}
FORCED CONTINUOUS MODE
2.6
I_VDR
100 VOUT1 = 2.5V WITH 5A LOAD
V_OUT2 = 1.8V WITH 5A LOAD
80 ^{VOUT3 = 1.2V WITH 5A LOAD}
2.5
I_VCC
2.4
60
2.3
40
2.2
20
2.1
0
2.0
150 250 350 450 550 650 750
SWITCHING FREQUENCY (kHz)
3773 G07
Forced Continuous Mode
0A to 10A Load Step
1.8V V_OUT
50mV/DIV
AC COUPLED
50μs/DIV
V_IN = 12V, f_SW = 220kHz
I_L
5A/DIV
I_LOAD
10A/DIV
3773 G09
I_VCC and I_VDR vs Load Current
100
DISCONTINUOUS
MODE
FORCED CONTINUOUS
10
Burst Mode
OPERATION
1
0.001
PLLFLTR = 0V
PLLFLTR = 5V
PLLFLTR = FLOATS
0.01 0.1
1
10 100
CHANNEL 1 LOAD CURRENT (A)
V_IN = 12V, V_CC = V_DR = 5V, V_OUT1 = 2.5V
V_OUT2 = 1.8V (NO LOAD), V_OUT3 = 1.2V (NO LOAD)
3773 G08
Discontinuous Mode 0A to 5A
Load Step at 5kHz Interval
1.8V V_OUT
50mV/DIV
AC COUPLED
50μs/DIV
V_IN = 12V, f_SW = 220kHz
I_L
5A/DIV
V_SW
10V/DIV
I_LOAD
5A/DIV
3773 G10
Burst Mode Operation 0A to 5A
Load Step at 5kHz Interval
1.8V V_OUT
50mV/DIV
AC COUPLED
6
50μs/DIV
V_IN = 12V, f_SW = 220kHz
I_L
5A/DIV
V_SW
10V/DIV
I_LOAD
5A/DIV
3773 G11
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