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LTC3633_15 Datasheet, PDF (5/28 Pages) Linear Technology – Dual Channel 3A, 15V Monolithic Synchronous Step-Down Regulator
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LTC3633
TYPICAL PERFORMANCE CHARACTERISTICS
otherwise noted.
Efficiency vs Load Current
Efficiency vs Load Current
Forced Continuous Mode
Burst Mode Operation
Operation
100
VOUT = 1.8V
90
100
VOUT = 1.8V
90
TJ = 25°C, VIN = 12V, fSW = 1MHz, L = 1µH unless
Efficiency vs Load Current
100
Burst Mode
90 OPERATION
80
80
70
70
60
60
50
50
80
FORCED
70
CONTINUOUS
OPERATION
60
50
40
40
40
30
30
30
20
VIN = 4V
20
VIN = 4V
20
10
VIN = 8V
VIN = 12V
10
VIN = 8V
VIN = 12V
10
VOUT = 5V
VOUT = 3.3V
0
0
0
1
10
100
1000 10000
1
10
100
1000 10000
1
10
100
1000 10000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
3633 G01
3633 G02
3633 G03
Efficiency vs Load Current
100
VOUT = 1.2V
90
80
70
60
50
40
30
20
10
0
0.1
VIN = 4V
VIN = 8V
VIN = 12V
VIN = 15V
1
10
100 1000 10000
LOAD CURRENT (mA)
3633 G04
Efficiency vs Input Voltage
Burst Mode Operation
100
VOUT = 1.8V
95
90
85
80
75
70
65
60
4
ILOAD = 10mA
ILOAD = 100mA
ILOAD = 1A
ILOAD = 3A
6
8 10 12
INPUT VOLTAGE (V)
14 16
3633 G05
Reference Voltage
vs Temperature
0.605
0.603
0.601
0.599
0.597
0.595
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3633 G06
Load Regulation
1.6
Burst Mode OPERATION
FORCED CONTINUOUS
1.2
0.8
0.4
0.0
–0.4
0 0.5 1 1.5 2 2.5 3
ILOAD (A)
3633 G07
Oscillator Frequency
vs Temperature
10
8
6
4
2
0
–2
–4
–6
–8
–10
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
3633 G08
Oscillator Internal Set Frequency
vs Temperature
2.6
RT = INTVCC
2.4
2.2
2.0
1.8
1.6
1.4
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
3633 G09
For more information www.linear.com/LTC3633
3633fd
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