LTC3371_15 Datasheet, PDF (7/26 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.
Oscillator Frequency vs V_CC
2.2
2.15
2.1
2.05
V_RT = V_CC
2
R_T = 400k
1.95
1.9
1.85
1.8
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
V_CC (V)
3371 G10
Oscillator Frequency vs R_T
4
V_CC = 3.3V
3.5
3
2.5
2
1.5
1
0.5
0
250 300 350 400 450 500 550 600 650 700 750 800
R_T (kΩ)
3371 G11
V_TEMP vs Temperature
1400
I_LOAD = 0mA
1200 V_CC = 3.3V
1000
800
600
ACTUAL V_TEMP
400
200
0
–200
–55
IDEAL V_TEMP
–25 5 35 65 95
TEMPERATURE (°C)
125 155
3371 G12
Enable Threshold vs Temperature
900
ALL REGULATORS DISABLED
850
V_CC = 3.3V
800
EN RISING
750
700
650
600
550
500
450
EN FALLING
400
350
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3371 G13
Enable Pin Precision Threshold
vs Temperature
415
410
405
EN RISING
400
395
390
EN FALLING
385
380
375
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3371 G14
Buck V_IN Supply Current
vs Temperature
50
BURST MODE OPERATION
FB = 850mV
40
30
20
10
0
–55 –25
V_IN = 2.25V
V_IN = 3.3V
V_IN = 5.5V
5 35 65 95
TEMPERATURE (°C)
125 155
3371 G15
Buck V_IN Supply Current
vs Temperature
550
500
450
400
350
300
250
200
V_IN = 2.25V
150
V_IN = 3.3V
100
V_IN = 5.5V
50 ^{FORCED CONTINUOUS MODE}
FB = 0V
0
–55 –25 5 35 65 95
125 155
TEMPERATURE (°C)
3371 G16
V_OUT vs Temperature
1.88
FORCED CONTINUOUS MODE
1.86 ^ILOAD ^{= 0mA}
1.84
1.82
1.80
1.78
1.76
1.74
1.72
–55 –25
V_IN = 2.25V
V_IN = 3.3V
V_IN = 5.5V
5 35 65 95
TEMPERATURE (°C)
125 155
3371 G17
PMOS Current Limit
vs Temperature
2.6
V_IN = 3.3V
2.5
2.4
2.3
2.2
2.1
2.0
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3371 G18
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3371fa
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