LTC1439 Linear Technology, LTC1439 Datasheet - Page 5

• Manufacturer Part Number: LTC1439
• Description: Dual High Efficiency/ Low Noise/ Synchronous Step-Down Switching Regulators
• Manufacturer: Linear Technology

TYPICAL PERFORMANCE CHARACTERISTICS
Burst Mode is a trademark of Linear Technology Corporation.
100
0.5
0.4
0.3
0.2
0.1
2.5
2.0
1.5
1.0
0.5
95
90
85
80
75
70
0
0
0
0
0
Efficiency vs Input Voltage
V
V
vs Load Current
Input Supply Current
vs Input Voltage
R
V
M1, M2: Si4412
OUT
V
IN
SENSE
OUT
OUT
– V
0.5
DROP OF 5%
= 3.3V
5
5
= 3.3V
3.3V OFF
OUT
= 0.033
5V ON
LOAD CURRENT (A)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
1.0
10
10
Dropout Voltage
5V AND
3.3V ON
I
LOAD
1.5
15
15
SHUTDOWN
= 1A
CURRENT
I
LOAD
2.0
20
20
= 100mA
3.3V ON
W
5V OFF
2.5
25
25
1438 G04
1438 G01
1438 G07
U
3.0
30
30
35
30
25
20
15
10
5
0
– 0.25
– 0.50
– 0.75
–1.00
–1.25
–1.50
100
95
90
85
80
75
70
0
0
0
Efficiency vs Input Voltage
V
Load Regulation
–2
–1
OUT
2
1
0
0
INTV
vs INTV
EXTV
0.5
= 5V
5
CC
CC
10
I
INPUT VOLTAGE (V)
LOAD CURRENT (A)
INTV
LOAD
1.0
10
= 0V
Regulation
CC
Load Current
CC
= 100mA
LOAD CURRENT (mA)
1.5
20
15
I
LOAD
R
SENSE
2.0
20
30
= 1A
V
70 C
25 C
= 0.033
OUT
2.5
25
= 5V
40
1438 G02
1438 G05
3.0
30
1438 G08
50
100
300
200
100
3.0
2.5
2.0
1.5
1.0
0.5
80
95
90
85
75
70
65
60
55
50
LTC1438/LTC1439
0
0.001
0
0
Efficiency vs Load Current
V
EXTV
vs INTV
0
V
V
R
ITH
OPERATION
Burst Mode
IN
OUT
SENSE
10
= 10V
Pin Voltage vs Output Current
= 5V
CC
5
20
INTV
= 0.33
0.01
CC
Switch Drop
OUTPUT CURRENT (%)
30
LOAD CURRENT (A)
CC
Load Current
10
LOAD CURRENT (mA)
40
CONTINUOUS/Adaptive
Power MODE
0.1
50
15
Burst Mode
OPERATION
Adaptive Power
MODE
60
CONTINUOUS
MODE
20
70
70 C
25 C
1
80
®
– 45 C
25
90
1435 G03
1438 G06
1438 G09
5
100
10
30