Datasheet

5
LT1725
1725fa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
TEMPERATURE (°C)
–50
MINIMUM SWITCH-ON TIME (ns)
275
250
225
200
175
150
125
25 75
1725 G10
–25 0
50 100 125
R
TON
= 50k
TEMPERATURE (°C)
–50
MINIMUM ENABLE TIME (ns)
275
250
225
200
175
150
125
25 75
1725 G11
–25 0
50 100 125
R
MINENAB
= 50k
TEMPERATURE (°C)
–50
ENABLE DELAY TIME (ns)
275
250
225
200
175
150
125
25 75
1725 G12
–25 0
50 100 125
FB PIN VOLTAGE (V)
1.05
FEEDBACK AMPLIFIER OUTPUT CURRENT (µA)
1.35
1725 G13
1.15 1.25
80
60
40
20
0
–20
–40
–60
–80
1.10 1.20 1.30 1.40
T
A
= 125°C
T
A
= –55°C
T
A
= 25°C
TEMPERATURE (°C)
–50
1600
1400
1200
1000
800
600
400
200
25 75
1725 G14
–25 0
50 100 125
FEEDBACK AMPLIFIER TRANSCONDUCTANCE (µmho)
TEMPERATURE (°C)
–50
SOFT-START CHARGING CURRENT (µA)
60
50
40
30
20
10
0
25 75
1725 G15
–25 0
50 100 125
V(SFST) = 0V
TEMPERATURE (°C)
–50
SOFT-START SINK CURRENT (mA)
2.5
2.0
1.5
1.0
0.5
0
0
50
75
1725 G16
–25
25
100
125
V(SFST) = 1.5V
Minimum Switch-On Time vs
Temperature
Minimum Enable Time vs
Temperature
Enable Delay Time vs
Temperature
Feedback Amplifier Output Current
vs FB Pin Voltage
Feedback Amplifier
Transconductance vs Temperature
Soft-Start Charging Current vs
Temperature
Soft-Start Sink Current vs
Temperature