LTC3525-3.3 Datasheet, PDF (5/12 Pages) Linear Technology – 400mA Micropower Synchronous Step-Up DC/DC Converter with Output Disconnect

LTC3525-3.3/LTC3525-5
TYPICAL PERFOR A CE CHARACTERISTICS T_A = 25°C unless otherwise noted.
LTC3525-5 Load Regulation
2.5
V_IN = 3.6V
2.0
1.5
1.0
0.5
C_OUT = 22µF
0
–0.5
C_OUT = 10µF
–1.0
–1.5
–2.0
–2.5
0
50
100
150
200
LOAD (mA)
3525 G10
Switching Frequency vs V_IN
1200
L = 10µH
1100
1000
LTC3525-5
900
800
700
LTC3525-3.3
600
500
400
300
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
V_IN (V)
3525 G11
Light Load Burst Frequency
vs Load
40
35
30
25
20
C_OUT = 10µF
15
10
C_OUT = 22µF
5
0
0.1
1
LOAD (mA)
10
3525 G12
V_OUT Variation vs Temperature
(Normalized to 25°C)
0.4
0.3
0.2
0.1
Startup Delay Coming Out of
Shutdown
120
100
80
LTC3525-3.3 Input Current and
V_OUT at Startup
V_IN = 1.2V
V_OUT
1V/DIV
0
60
INPUT
CURRENT
–0.1
100mA/DIV
40
500µs/DIV
3525 G15
–0.2
20
–0.3
–0.4
–40–30–20–10 0 10 20 30 40 50 60 70 80
TEMPERATURE (°C)
3525 G13
0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
V_IN (V)
3525 G14
LTC3525-3.3 Output Voltage
Ripple
LTC3525-3.3 Output Voltage
Ripple
I_OUT =
5mA
I_OUT =
40mA
I_OUT =
80mA
V_IN = 1.2V
C_OUT = 10µF
50µs/DIV
50mV/DIV
3525 G16
I_OUT =
5mA
I_OUT =
40mA
I_OUT =
80mA
V_IN = 1.2V
C_OUT = 22µF
50µs/DIV
50mV/DIV
3525 G17
3525f
5