Datasheet

LTC3537
5
3537fd
TYPICAL PERFORMANCE CHARACTERISTICS
Effi ciency vs Load Current and
V
INB
for V
OUTB
= 5V Maximum Output Current vs V
INB
Minimum Load Resistance During
Start-Up vs V
INB
Start-Up Delay Time vs V
INB
Burst Mode Threshold Current
vs V
INB
Burst Mode Threshold Current
vs V
INB
Effi ciency vs Load Current and
V
INB
for V
OUTB
= 1.8V
Effi ciency vs Load Current and
V
INB
for V
OUTB
= 3.3V No-Load Input Current vs V
INB
T
A
= 25°C unless otherwise noted.
LOAD CURRENT (mA)
0.01
EFFICIENCY (%)
POWER LOSS (mW)
100
80
90
60
20
30
40
70
50
10
0
1000
10
0.1
1
100
0.01
100.1
3537 G01
10001 100
PLOSS AT V
INB
= 1V
PLOSS AT V
INB
= 1.2V
PLOSS AT V
INB
= 1.5V
V
INB
= 1V
V
INB
= 1.2V
V
INB
= 1.5V
LOAD CURRENT (mA)
0.01
EFFICIENCY (%)
POWER LOSS (mW)
100
80
90
60
20
30
40
70
50
10
0
1000
10
0.1
1
100
0.01
100.1
3537 G02
10001 100
PLOSS AT V
INB
= 1.2V
PLOSS AT V
INB
= 1.8V
PLOSS AT V
INB
= 2.4V
PLOSS AT V
INB
= 2.8V
V
INB
= 1.2V
V
INB
= 1.8V
V
INB
= 2.4V
V
INB
= 2.8V
LOAD CURRENT (mA)
0.01
EFFICIENCY (%)
POWER LOSS (mW)
100
80
90
60
20
30
40
70
50
10
0
1000
10
0.1
1
100
0.01
100.1
3537 G04
10001 100
PLOSS AT V
INB
= 1.2V
PLOSS AT V
INB
= 2.4V
PLOSS AT V
INB
= 3.6V
PLOSS AT V
INB
= 4.2V
V
INB
= 1.2V
V
INB
= 2.4V
V
INB
= 3.6V
V
INB
= 4.2V
V
INB
(V)
0.5
LOAD CURRENT (mA)
1000
800
900
600
200
300
400
700
500
100
0
3.532.51.5
3537 G05
4.5214
V
OUTB
= 2.5V
V
OUTB
= 1.8V
V
OUTB
= 3.3V
V
OUTB
= 5V
V
INB
(V)
0.8
LOAD (Ω)
1000
100
10
1.61.51.41.31.21
3537 G06
1.81.10.9 1.7
V
INB
(V)
1
DELAY (µs)
60
30
20
10
50
40
0
4.543.532
3537 G07
52.51.5
V
INB
(V)
0.8
30
25
20
15
10
5
0
45
40
35
LOAD CURRENT (mA)
0.9
1 1.1 1.2 1.3 1.4
3537 G08
ENTER BURST
LEAVE BURST
V
OUTB
= 1.8V
C
OUTB
= 10μF
L = 2.2μH
V
INB
(V)
0.8
30
25
20
15
10
5
0
50
45
40
35
LOAD CURRENT (mA)
1
1.2 1.4 1.6 1.8 2
3537 G09
ENTER BURST
LEAVE BURST
V
OUTB
= 2.5V
C
OUTB
= 10μF
L = 2.2μH
V
INB
(V)
0.6
120
100
60
80
40
20
0
180
160
140
I
INB
(μA)
1.2 1.8 2.4 3 4.83.6 4.2
3537 G03
V
OUTB
= 5V
V
OUTB
= 3.3V
V
OUTB
= 2.5V
V
OUTB
= 1.8V