LTC3371_15 Datasheet, PDF (6/26 Pages) Linear Technology – 4-Channel 8A Configurable Buck DC/DCs with Watchdog and Power-On Reset

LTC3371
Typical Performance Characteristics T_A = 25°C unless otherwise noted.
Buck Efficiency vs I_LOAD
100
90
80
70
60
50
40
30 Burst Mode OPERATION
20
V_IN = 3.3V
V_OUT = 1.8V
10 fOSC = 2MHz
L = 2.2µH
0
1
10
100
LOAD CURRENT (mA)
1A BUCK
2A BUCK
3A BUCK
4A BUCK
1000 4000
3371 G01
Buck V_IN Undervoltage Threshold
vs Temperature
2.30
2.25
2.20
2.15
2.10
2.05
2.00
1.95
1.90
–55
V_IN RISING
V_IN FALLING
–25 5 35 65 95
TEMPERATURE (°C)
125 155
3371 G04
Buck Power Loss vs I_LOAD
3000
1A BUCK
2500
2A BUCK
3A BUCK
4A BUCK
2000
1500
1000 _{Burst Mode OPERATION}
V_IN = 3.3V
500 V_OUT = 1.8V
f_OSC = 2MHz
L = 2.2µH
0
1
10
100
LOAD CURRENT (mA)
1000
4000
3371 G02
V_CC Supply Current
vs Temperature
40
ALL REGULATORS
35 ^{IN SHUTDOWN}
30
25
20
15
10
5
0
–55 –25
V_CC = 2.7V
V_CC = 3.3V
V_CC = 5.5V
5 35 65 95
TEMPERATURE (°C)
125 155
3371 G05
V_CC Undervoltage Threshold
vs Temperature
2.70
2.65
2.60
2.55
2.50
2.45
2.40
2.35
2.30
–55
V_CC RISING
V_CC FALLING
–25 5 35 65 95
TEMPERATURE (°C)
125 155
3371 G03
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
3371 G06
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
3371 G07
R_T Programmed Oscillator
Frequency vs Temperature
2.20
R_T = 400k
2.15
2.10
2.05
2.00
1.95
1.90
1.85
1.80
–55
V_CC = 2.7V
V_CC = 3.3V
V_CC = 5.5V
–25 5 35 65 95
TEMPERATURE (°C)
125 155
3371 G08
6
For more information www.linear.com/LTC3371
Default Oscillator Frequency
vs Temperature
2.20
V_RT = V_CC
2.15
2.10
2.05
2.00
1.95
1.90
1.85
1.80
–55
V_CC = 2.7V
V_CC = 3.3V
V_CC = 5.5V
–25 5 35 65 95
TEMPERATURE (°C)
125 155
3371 G09
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