ltc3728legn-trpbf Linear Technology Corporation, ltc3728legn-trpbf Datasheet - Page 5

• Manufacturer Part Number: ltc3728legn-trpbf
• Description: Dual, 550khz, 2-phase Synchronous Step-down Switching Regulator
• Manufacturer: Linear Technology Corporation

TYPICAL PERFORMANCE CHARACTERISTICS
1000
600
100
800
400
200
5.1
5.0
4.9
4.8
4.7
4.6
4.5
4.4
60
90
80
70
50
40
30
20
10
0
0
0.001
0
Effi ciency vs Output Current and
Mode (Figure 13)
Supply Current vs Input Voltage
and Mode (Figure 13)
0
Internal 5V LDO Line Regulation
I
OPERATION
LOAD
Burst Mode
5
5
SHUTDOWN
= 1mA
0.01
10
OUTPUT CURRENT (A)
10
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
BOTH
CONTROLLERS ON
15
15
CONSTANT
FREQUENCY
(BURST DISABLE)
0.1
FORCED
CONTINUOUS
MODE (PWM)
20
20
25
25
1
V
V
f = 250kHz
IN
OUT
30
30
= 15V
3728 G07
3728 G01
3728 G04
= 5V
35
10
35
250
200
150
100
100
50
75
50
25
90
80
70
60
50
0
0.001
0
0
Effi ciency vs Output Current
(Figure 13)
EXTV
Maximum Current Sense
Threshold vs Duty Factor
0
CC
20
10
0.01
Voltage Drop
V
OUTPUT CURRENT (A)
IN
DUTY FACTOR (%)
= 20V
CURRENT (mA)
V
40
V
20
IN
IN
= 7V
V
= 15V
0.1
IN
= 10V
60
30
1
V
f = 250kHz
40
80
OUT
3728 G05
3728 G02
3728 G08
= 5V
100
50
10
5.05
5.00
4.90
4.85
4.80
4.75
4.70
4.95
100
90
80
70
50
80
70
60
50
40
30
20
10
60
0
–50
0
5
PERCENT ON NOMINAL OUTPUT VOLTAGE (%)
Effi ciency vs Input Voltage
(Figure 13)
INTV
Voltage vs Temperature
Maximum Current Sense
Threshold vs Percent of Nominal
Output Voltage (Foldback)
–25
CC
EXTV
and EXTV
25
0
TEMPERATURE (°C)
INPUT VOLTAGE (V)
CC
15
SWITCHOVER THRESHOLD
INTV
25
LTC3728
50
CC
CC
50
VOLTAGE
Switch
25
75
75
V
I
f = 250kHz
OUT
OUT
100
= 3A
3728 G06
3728 G09
= 5V
3728 G03
3728fd
5
100
125
35