Datasheet

LTC3125
5
3125fa
R
DS(ON)
vs V
OUT
R
DS(ON)
vs Temperature
Oscillator Frequency
vs Temperature
Feedback vs Temperature
Current Sense Voltage (V
RPROG
)
vs Temperature Burst Mode Current vs V
OUT
TYPICAL PERFORMANCE CHARACTERISTICS
(T
A
= 25°C unless otherwise noted)
V
OUT
and I
IN
During Soft-Start
V
OUT
and I
IN
During Soft-Start
V
OUT
(V)
1.5
RDS(ON) ()
0.400
3
3125 G12
0.250
0.150
2 2.5 3.5
0.100
0.050
0.450
0.350
0.300
0.200
4 4.5 5
PMOS
NMOS
TEMPERATURE (°C)
–50
180
200
240
10 50
3125 G13
160
140
–30 –10
30 70 90
120
100
220
R
DS(ON)
(m)
PMOS
NMOS
V
OUT
= 4V
TEMPERATURE (°C)
–50
–10
FREQUENCY CHANGE (%)
–6
–2
2
–25
0
25 50
3125 G14
75
6
10
–8
–4
0
4
8
100
NORMALIZED TO 25°C
TEMPERATURE (°C)
–50
CHANGE IN V
FB
(%)
0
0.25
0.50
10 50
3125 G15
–0.25
–0.50
–30 –10
30 70 90
–0.75
–1.00
NORMALIZED TO 25°C
TEMPERATURE (°C)
–50
CHANGE IN V
FB
(%)
0
0.25
0.50
10 50
3125 G15
–0.25
–0.50
–30 –10
30 70 90
–0.75
–1.00
NORMALIZED TO 25°C
V
OUT
(V)
1.5
I
Q
(µA)
15.0
15.5
16.0
34
3125 G17
14.5
14.0
2 2.5
3.5 4.5 5
13.5
13.0
V
OUT
2V/DIV
SHDN
5V/DIV
INPUT
CURRENT
200mA/DIV
20ms/DIVV
IN
= 3.3V
V
OUT
= 4.5V
C
OUT
= 4.4mF
L = 2.7µH
3125 G18
BURST
CURRENT
V
OUT
2V/DIV
SHDN
5V/DIV
INPUT
CURRENT
200mA/DIV
1s/DIVV
IN
= 3.3V
V
OUT
= 4.5V
C
OUT
= 0.47F
L = 2.7µH
3125 G19