LTC3370_15 Datasheet, PDF (6/24 Pages) Linear Technology – 4-Channel 8A Configurable Buck DC/DCs

LTC3370
Typical Performance Characteristics T_A = 25°C, unless otherwise noted.
Buck Efficiency vs I_LOAD
100
90
80
70
60
Burst Mode OPERATION
50
V_IN = 3.3V
V_OUT = 1.8V
40
f_OSC = 2MHz
30
L = 2.2µH
20
1A BUCK
2A BUCK
10
3A BUCK
0
4A BUCK
1
10
100
1000
LOAD CURRENT (mA)
3370 G01
Buck V_IN Undervoltage Threshold
vs Temperature
2.30
2.25
2.20
V_IN RISING
2.15
2.10
V_IN FALLING
2.05
2.00
1.95
1.90
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3370 G04
R_T Programmed Oscillator
Frequency vs Temperature
2.20
R_T = 400k
2.15
2.10
V_CC = 2.7V
V_CC = 3.3V
V_CC = 5.5V
2.05
2.00
1.95
1.90
1.85
1.80
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3371 G07
6
Buck Power Loss vs I_LOAD
3000
2500
2000
Burst Mode OPERATION
V_IN = 3.3V
V_OUT = 1.8V
f_OSC = 2MHz
L = 2.2µH
1500
1000
1A BUCK
2A BUCK
3A BUCK
4A BUCK
500
0
1
10
100
1000
LOAD CURRENT (mA)
3370 G02
V_CC Supply Current vs
Temperature
125
AT LEAST ONE BUCK ENABLED
PLL/MODE = 0V
100 ^{FB = 850mV}
75
50
25
0
–55 –25
V_CC = 2.7V
V_CC = 3.3V
V_CC = 5.5V
5 35 65 95
TEMPERATURE (°C)
125 155
3370 G05
Default Oscillator Frequency vs
Temperature
2.20
V_RT = V_CC
2.15
2.10
V_CC = 2.7V
V_CC = 3.3V
V_CC = 5.5V
2.05
2.00
1.95
1.90
1.85
1.80
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3370 G08
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V_CC Undervoltage Threshold vs
Temperature
2.70
2.65
2.60
V_CC RISING
2.55
2.50
V_CC FALLING
2.45
2.40
2.35
2.30
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3370 G03
V_CC Supply Current vs
Temperature
400
AT LEAST ONE BUCK ENABLED
360 PLL/MODE = 2MHz
320
280
240
200
160
120
80
40
0
–55 –25
V_CC = 2.7V
V_CC = 3.3V
V_CC = 5.5V
5 35 65 95
TEMPERATURE (°C)
125 155
3370 G06
Oscillator Frequency vs V_CC
2.20
2.15
2.10
2.05
V_RT = V_CC
2.00
R_T = 400k
1.95
1.90
1.85
1.80
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
V_CC (V)
3370 G09
3370f