LTC3773 Datasheet, PDF (5/32 Pages) Linear Technology – Triple Output Synchronous 3-Phase DC/DC Controller with Up/Down Tracking

TYPICAL PERFORMANCE CHARACTERISTICS
LTC3773
Efficiency vs Load Current,
Shutdown CH2 and CH3
100
10000
90
80
1000
70
60
CONTINUOUS ¹⁰⁰
50
MODE
40
30
20
10
0
0.001 0.01
DISCONTINUOUS
10
MODE
Burst Mode
OPERATION
1
EFFICIENCY
POWER LOSS _0.1
0.1
1
10
100
CHANNEL 1 LOAD CURRENT (A)
V_IN = 12V, V_CC = 5V, V_OUT1 = 2.5V
f_SW = 220kHz
3773 G01
Efficiency vs V_IN
Shutdown CH2 and CH3
100 _{VCC = 5V, VOUT1 = 2.5V, IOUT1 = 5A}
4.0
SHUTDOWN CH2 AND CH3
95
3.2
90 ^{PLLFLTR = 5V}
2.4
f_SW = 560kHz
PLLFLTR FLOATS
85
f_SW = 400kHz
PLLFLTR = 0V
1.6
f_SW = 220kHz
80
0.8
EFFICIENCY
POWER LOSS
75
0.0
0
5
10
15
20
25
V_IN (V)
3773 G03
Line Regulation
2.5
1.0
V_CC = 5V, V_OUT = 2.5V, I_OUT = 5A
2.0
0.8
1.5
0.6
1.0
0.4
0.5
0.2
0
0
–0.5
–0.2
–1.0
–0.4
–1.5
–0.6
–2.0
–0.8
–2.5
0
–1.0
5
10
15
20
25
V_IN (V)
3773 G05
Efficiency vs Load Current,
Power-Up CH2 and CH3
100
10000
90
80
1000
70
60
50
40
30
20
10
0
0.001 0.01
CONTINUOUS 100
MODE
DISCONTINUOUS
MODE
10
Burst Mode
OPERATION
1
EFFICIENCY
POWER LOSS _0.1
0.1
1
10
100
CHANNEL 1 LOAD CURRENT (A)
V_IN = 12V, V_CC = 5V, V_OUT1 = 2.5V
V_OUT2 = 1.8V (NO LOAD), V_OUT3 = 1.2V (NO LOAD)
f_SW = 220kHz
3773 G02
Load Regulation
5
0.2
V_IN = 12V, V_CC = 5V, V_OUT = 2.5V
0
0.0
–5
–0.2
–10
–0.4
–15
–20
–25
0
CONTINUOUS MODE
DISCONTINUOUS MODE
Burst Mode OPERATION
5
10
15
LOAD CURRENT (A)
–0.6
–0.8
–1.0
20
3773 G04
Current Limit vs V_IN
25
R_SENSE = 3mΩ
20
15
R_SENSE = 5mΩ
10
5
V_CC = 5V, V_OUT = 2.5V, f_SW = 220kHz
0
0
5
10
15
20
V_IN (V)
25
3773 G06
3773fb
5