LTC3728LEUH#TR Linear Technology, LTC3728LEUH#TR Datasheet - Page 6

• Manufacturer Part Number: LTC3728LEUH#TR
• Description: IC REG SW DUAL 2PH STPDWN 32QFN
• Manufacturer: Linear Technology
• Series: PolyPhase®r
• Type: Step-Down (Buck)r

Specifications of LTC3728LEUH#TR

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.8 ~ 7 V
• Current - Output: 3A
• Frequency - Switching: 250kHz ~ 550kHz
• Voltage - Input: 4.5 ~ 28 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-QFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

LTC3728L/LTC3728LX
TYPICAL PERFORMANCE CHARACTERISTICS
6
1000
100
800
600
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
0
Effi ciency vs Output Current
and Mode (Figure 13)
Supply Current vs Input Voltage
and Mode (Figure 13)
Internal 5V LDO Line Regulation
I
OPERATION
LOAD
Burst Mode
5
5
= 1mA
SHUTDOWN
0.01
OUTPUT CURRENT (A)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
10
10
BOTH
CONTROLLERS ON
CONSTANT
FREQUENCY
(BURST DISABLE)
0.1
15
15
FORCED
CONTINUOUS
MODE (PWM)
20
20
1
V
V
f = 250kHz
IN
OUT
25
25
= 15V
3728L G01
3728L G04
3728L G07
= 5V
10
30
30
100
200
150
100
90
80
70
60
50
50
75
50
25
0.001
0
0
0
0
Effi ciency vs Output Current
(Figure 13)
EXTV
Maximum Current Sense
Threshold vs Duty Factor
CC
20
0.01
10
Voltage Drop
V
OUTPUT CURRENT (A)
IN
DUTY FACTOR (%)
= 20V
CURRENT (mA)
V
40
V
IN
IN
= 7V
V
= 15V
0.1
20
IN
= 10V
60
30
1
V
f = 250kHz
80
OUT
3728L G02
3728L G05
3728L G08
= 5V
100
40
10
4.75
4.70
5.05
5.00
4.95
4.90
4.85
4.80
100
90
80
70
50
60
80
70
60
50
40
30
20
10
0
–50
5
0
Effi ciency vs Input Voltage
(Figure 13)
INTV
Voltage vs Temperature
Maximum Current Sense
Threshold vs Percent of Nominal
Output Voltage (Foldback)
PERCENT ON NOMINAL OUTPUT VOLTAGE (%)
–25
CC
EXTV
and EXTV
25
0
INPUT VOLTAGE (V)
TEMPERATURE (°C)
CC
15
SWITCHOVER THRESHOLD
INTV
25
50
CC
CC
50
VOLTAGE
Switch
25
75
75
V
I
f = 250kHz
OUT
OUT
100
3728L G03
= 3A
3728L G06
3728L G09
= 5V
3728lxfe
125
100
35