Datasheet

5
LTC3778
3778f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Maximum Current Sense
Threshold vs Temperature
Maximum Current Sense
Threshold vs V
RNG
Voltage
Feedback Reference Voltage
vs Temperature Error Amplifier g
m
vs Temperature
Current Limit Foldback
On-Time vs I
ON
Current On-Time vs V
ON
Voltage On-Time vs Temperature
Maximum Current Sense
Threshold vs RUN/SS Voltage
I
ON
CURRENT (µA)
1
10
ON-TIME (ns)
100
1k
10k
10 100
3778 G20
V
VON
= 0V
V
ON
VOLTAGE (V)
0
ON-TIME (ns)
400
600
3778 G21
200
0
1
2
3
1000
I
ION
= 30µA
800
TEMPERATURE (°C)
–50
ON-TIME (ns)
200
250
300
25 75
3778 G22
150
100
–25 0
50 100 125
50
0
I
ION
= 30µA
V
ON
= 0V
V
FB
(V)
0
0
MAXIMUM CURRENT SENSE THRESHOLD (mV)
25
50
75
100
125
150
V
RNG
= 1V
0.15 0.30 0.45 0.60
3778 G09
V
RNG
VOLTAGE (V)
0.5
0
MAXIMUM CURRENT SENSE THRESHOLD (mV)
50
100
150
200
300
0.75
1.0 1.25 1.5
3778 G10
1.75 2.0
250
RUN/SS VOLTAGE (V)
1.5
0
MAXIMUM CURRENT SENSE THRESHOLD (mV)
25
50
75
100
125
150
V
RNG
= 1V
2 2.5 3 3.5
3778 G23
TEMPERATURE (°C)
–50 –25
100
MAXIMUM CURRENT SENSE THRESHOLD (mV)
120
150
0
50
75
3778 G11
110
140
130
25
100
125
V
RNG
= 1V
TEMPERATURE (°C)
–50
0.58
FEEDBACK REFERENCE VOLTAGE (V)
0.59
0.60
0.61
0.62
–25 0 25 50
3778 G12
75 100 125
TEMPERATURE (°C)
–50 –25
1.0
g
m
(mS)
1.4
2.0
0
50
75
3778 G13
1.2
1.8
1.6
25
100
125