LTC3425 Linear Technology, LTC3425 Datasheet - Page 5

• Manufacturer Part Number: LTC3425
• Description: 5A 8MHz 4-Phase Synchronous Step-Up DC/DC Converter
• Manufacturer: Linear Technology

TYPICAL PERFOR A CE CHARACTERISTICS
100
100
90
80
70
60
50
40
30
20
10
90
80
70
60
50
40
30
20
10
10
0
0
1
0.1
1
Converter Efficiency
for V
1
Efficiency Comparison of
Discontinuous Mode and Forced
Continuous Mode at Light Loads
for V
Oscillator Frequency
T
1MHz/PHASE
T
DISCONTINUOUS
T
A
A
V
A
IN
= 25 C
= 25 C
= 25 C
CONVERTER OUTPUT CURRENT (mA)
OUT
= 2.4V
IN
V
IN
1
= 2.4V, V
= 1.2V
= 3.3V
OUTPUT CURRENT (mA)
MODE
10
10
R
T
Burst Mode OPERATION
1MHz/PHASE
10
OUT
V
(k )
IN
FORCED
CONTINUOUS
MODE
100
V
= 1.2V
IN
= 3.3V
100
= 2.4V
W
1000
3425 G11
3425 G14
3425 G17
10000
U
1000
100
100
20
10
100
90
80
70
60
50
40
30
1.8
1.6
1.2
1.0
0.8
0.6
1.4
90
80
70
60
50
40
30
20
10
0
0
1
0.1
60
Efficiency Comparison of
Discontinuous Mode and Forced
Continuous Mode at Light Loads
for V
T
1MHz/PHASE
Peak Current Limit
Converter Efficiency
for V
A
T
V
DISCONTINUOUS
A
= 25 C
IN
= 25 C
= 3.3V
80
IN
OUT
= 3.3V, V
1
V
V
OUTPUT CURRENT (mA)
100
IN
= 5V
IN
MODE
I
10
LIM
= 2.4V
= 3.3V
LOAD (mA)
10
RESISTOR (k )
120
OUT
Burst Mode OPERATION
1MHz/PHASE
FORCED
CONTINUOUS
MODE
140
V
100
IN
= 5V
100
= 2.4V
160
1000
T
A
180
= 25 C
3425 G15
3425 G18
3425 G12
1000
10000
200
0.065
0.060
0.055
0.050
0.045
0.040
140
120
100
98
96
94
92
90
88
86
84
82
80
80
60
40
20
0
100
1.5
2.5
Converter No Load Input Current
vs V
Effective R
Converter Efficiency for 2-, 3- and
4-Phase Operation
T
T
V
V
1MHz/PHASE
T
A
A
IN
OUT
A
= 25 C
= 25 C
= 25 C
= 2.4V
IN
2.0
= 3.3V
3
(Burst Mode Operation)
V
OUT
www.DataSheet4U.com
2.5
DS(ON)
= 3.3V
PMOS
NMOS
V
3.5
2 PHASE
LOAD (mA)
OUT
V
V
OUT
1000
IN
3.0
LTC3425
= 5V
(V)
(V)
4
3 PHASE
3.5
4 PHASE
4.5
4.0
3425 G13
3425 G16
3425 G19
5
10000
3425f
4.5
5