LTC3539-2_15 Datasheet, PDF (4/14 Pages) Linear Technology – 2A, 1MHz/2MHz Synchronous Step-Up DC/DC Converters

LTC3539/LTC3539-2
TYPICAL PERFORMANCE CHARACTERISTICS (T_A = 25°C unless otherwise noted)
Efficiency vs Load Current and
V_IN, V_OUT = 5V
100
1000
90
80
100
70
EFFICIENCY
60
50
10
40
POWER LOSS
30
20
10
0
0.1
1
V_IN = 2.4V
V_IN = 3.6V
V_IN = 4.2V _0.1
1
10
100
1000
LOAD CURRENT (mA)
3539 G03
Minimum Load Resistance During
Start-Up vs V_IN
10000
V_OUT = 3.3V
1000
100
10
0.1
0.65 0.75 0.85 0.95 1.05 1.15
V_IN (V)
3539 G06
No Load Input Current vs V_IN
200
V_OUT = 1.8V
180
V_OUT = 2.5V
160
V_OUT = 3.3V
V_OUT = 5V
140
120
100
80
60
40
20
0
0
1
2
3
4
5
V_IN (V)
3539 G04
Maximum Output Current vs V_IN
2000
L = 2.2µH
1800
1600
1400
1200
1000
800
600
400
V_OUT = 1.8V
V_OUT = 2.5V
200
V_OUT = 3.3V
V_OUT = 5V
0
0.7 1.1 1.5 1.9 2.3 2.7 3.1 3.5 3.9 4.3 4.7 5.1
V_IN (V)
3539 G05
Burst Mode Threshold Current
vs V_IN; V_OUT = 1.8V
50
C_OUT = 44µF
45
f_SW = 1MHz
40
35
30 LEAVE BURST
25
20
15
f_SW = 2MHz
10
ENTER BURST
5
0
0.7 0.8 0.9
1 1.1 1.2 1.3 1.4 1.5
V_IN (V)
3539 G07a
Burst Mode Threshold Current
vs V_IN; V_OUT = 2.5V
50
C_OUT = 44µF
45
40
35
f_SW = 1MHz
30
LEAVE BURST
25
20
f_SW = 2MHz
15
10
ENTER BURST
5
0
0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1
V_IN (V)
3539 G07b
Burst Mode Threshold Current
vs V_IN; V_OUT = 3.3V
60
C_OUT = 44µF
50
40
LEAVE BURST
30
f_SW = 1MHz
20
10
f_SW = 2MHz
ENTER BURST
0
0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5 2.7
V_IN (V)
3539 G07c
Burst Mode Threshold Current
vs V_IN; V_OUT = 5V
100
C_OUT = 44µF
90
80
70
60
f_SW = 1MHz
50
LEAVE BURST
40
30
20
f_SW = 2MHz
10
ENTER BURST
0
0.7 1.1 1.5 1.9 2.3 2.7 3.1 3.5 3.9 4.3
V_IN (V)
3539 G07d
Normalized Current Limit vs V_OUT
1.10
1.05
1.00
0.95
0.90
0.85
0.80
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
V_OUT (V)
3539 G08
35392fc
4
For more information www.linear.com/3539/3539-2