Datasheet

LTC3525-3/
LTC3525-3.3/LTC3525-5
5
3525fb
LTC3525-5 Load Regulation Switching Frequency vs V
IN
Light Load Burst Frequency
vs Load
V
OUT
Variation vs Temperature
(Normalized to 25°C)
Startup Delay Coming Out of
Shutdown
LTC3525-3.3 Input Current and
V
OUT
at Start-Up
LTC3525-3.3 Output Voltage
Ripple
LTC3525-5 Load Regulation
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C unless otherwise noted.
3525 G09
LOAD (mA)
0 12010020 40 60 80 140
CHANGE IN V
OUT
(%)
2.5
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–2.5
C
OUT
= 22µF
C
OUT
= 10µF
V
IN
= 2.4V
3525 G10
LOAD (mA)
0 15050 200100
CHANGE IN V
OUT
(%)
2.5
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–2.5
C
OUT
= 22µF
C
OUT
= 10µF
V
IN
= 3.6V
3525 G11
V
IN
(V)
1.0 2.5 3.51.5 2.0 3.0 4.0 4.5
FREQUENCY (kHz)
1200
1100
1000
900
800
700
600
500
400
300
LTC3525-5
LTC3525-3.3
L = 10µH
3525 G12
LOAD (mA)
0.1
BURST FREQUENCY (kHz)
40
35
30
25
20
15
10
5
0
1 10
C
OUT
= 10µF
C
OUT
= 22µF
3525 G13
TEMPERATURE (°C)
–40–30–20–10 0
CHANGE IN V
OUT
(%)
8040 502010 30 7060
0.4
0.3
0.2
0.1
–0.1
–0.2
–0.3
–0.4
0
1.0 2.5 3.51.5 2.0 3.0 4.0 4.5
3525 G14
120
100
80
60
40
20
0
SWITCHING DELAY (µs)
V
IN
(V)
3525 G15
INPUT
CURRENT
100mA/DIV
V
OUT
1V/DIV
500µs/DIV
V
IN
= 1.2V
3525 G16
50mV/DIV
I
OUT
80mA
I
OUT
40mA
I
OUT
5mA
50µs/DIV
V
IN
= 1.2V
C
OUT
= 10µF