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| LTC3728LCGN-PBF Datasheet, PDF (6/38 Pages) Linear Technology – Dual, 550kHz, 2-Phase Synchronous Regulators | |||
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LTC3728L/LTC3728LX
Typical Performance Characteristics
Efficiency vs Output Current
and Mode (Figure 13)
100
Burst Mode
90 OPERATION
80
70
FORCED
60
CONTINUOUS
50
MODE (PWM)
40
30
20
10
0
0.001
CONSTANT
FREQUENCY
(BURST DISABLE)
VIN = 15V
VOUT = 5V
f = 250kHz
0.01
0.1
1
10
OUTPUT CURRENT (A)
3728L G01
Supply Current vs Input Voltage
and Mode (Figure 13)
1000
800
600
BOTH
CONTROLLERS ON
400
200
0
0
SHUTDOWN
5 10 15 20
INPUT VOLTAGE (V)
25 30
3728L G04
Internal 5V LDO Line Regulation
5.1
ILOAD = 1mA
5.0
4.9
4.8
4.7
4.6
4.5
4.4
0
5 10 15 20 25 30
INPUT VOLTAGE (V)
3728L G07
6
Efficiency vs Output Current
(Figure 13)
100
VIN = 7V
90
VIN = 10V
80
VIN = 15V
VIN = 20V
70
60
50
0.001
VOUT = 5V
f = 250kHz
0.01
0.1
1
OUTPUT CURRENT (A)
10
3728L G02
EXTVCC Voltage Drop
200
150
100
50
0
0
10
20
30
40
CURRENT (mA)
3728L G05
Maximum Current Sense
Threshold vs Duty Factor
75
50
25
0
0
20
40
60
80
100
DUTY FACTOR (%)
3728L G08
Efficiency vs Input Voltage
(Figure 13)
100
90
80
70
60
VOUT = 5V
IOUT = 3A
50
f = 250kHz
5
15
25
35
INPUT VOLTAGE (V)
3728L G03
INTVCC and EXTVCC Switch
Voltage vs Temperature
5.05
INTVCC VOLTAGE
5.00
4.95
4.90
4.85
4.80
EXTVCC SWITCHOVER THRESHOLD
4.75
4.70
â50 â25
0 25 50 75 100 125
TEMPERATURE (°C)
3728L G06
Maximum Current Sense
Threshold vs Percent of Nominal
Output Voltage (Foldback)
80
70
60
50
40
30
20
10
0
0
25
50
75
100
PERCENT ON NOMINAL OUTPUT VOLTAGE (%)
3728L G09
3728lxff
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