LTC3535 Datasheet, PDF (4/16 Pages) Linear Technology – Dual Channel 550mA 1MHz Synchronous Step-Up DC/DC Converter

LTC3535
TYPICAL PERFORMANCE CHARACTERISTICS (Each Channel) T_A = 25°C, unless otherwise noted.
Efficiency vs Load Current
and V_IN for V_OUT = 5V
100
EFFICIENCY
90
1000
80
100
70
60
10
50
POWER LOSS
40
1
30
20
10
0
0.01
V_IN = 1.2V
V_IN = 2.4V ^0.1
V_IN = 3.6V
V_IN = 4.2V
0.01
0.1
1
10 100 1000
LOAD CURRENT (mA)
3535 G03
Start-Up Delay Time vs V_IN
100
90
80
70
60
50
40
30
20
10
0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
V_IN (V)
3535 G07
Burst Mode Threshold Current
vs V_IN
40
V_OUT = 3.3V
35 L = 4.7μH
LEAVE BURST
30
25
20
ENTER BURST
15
10
5
0
1.0
1.5
2.0
2.5
3.0
V_IN (V)
3535 G08c
4
Maximum Output Current vs V_IN
400
V_OUT = 3.3V
350
V_OUT = 2.5V
300 ^VOUT ^{= 1.8V}
250
Minimum Load Resistance
During Start-Up vs V_IN
10000
V_OUT = 3.3V
1000
200
V_OUT = 5V
150
100
100
50
L = 4.7μH
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
V_IN (V)
3535 G05
10
0.65 0.75 0.85 0.95 1.05 1.15
V_IN (V)
3526 G06
Burst Mode Threshold Current
vs V_IN
30
V_OUT = 1.8V
L = 4.7μH
25
LEAVE BURST
20
15
ENTER BURST
10
5
0
1
1.25
1.5
V_IN (V)
3535 G08a
Burst Mode Threshold Current
vs V_IN
40
V_OUT = 2.5V
35 ^{L = 4.7μH}
LEAVE BURST
30
25
ENTER BURST
20
15
10
5
0
1
1.25
1.5
1.75
2
V_IN (V)
3535 G08b
Burst Mode Threshold Current
vs V_IN
50
V_OUT = 5V
L = 4.7μH
40
LEAVE BURST
30
ENTER BURST
20
10
Oscillator Frequency Change
vs V_OUT
3
NORMALIZED TO V_OUT = 3.3V
2
1
0
–1
–2
0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
V_IN (V)
3535 G08d
–3
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
V_OUT (V)
3535 G09
3535f