Datasheet

LT3757/LT3757A
5
3757afd
Typical perForMance characTerisTics
Switching Frequency
vs Temperature
SENSE Current Limit Threshold
vs Temperature
SENSE Current Limit Threshold
vs Duty Cycle
SHDN/UVLO Threshold
vs Temperature SHDN/UVLO Current vs Voltage
SHDN/UVLO Hysteresis Current
vs Temperature
Dynamic Quiescent Current
vs Switching Frequency R
T
vs Switching Frequency
Normalized Switching Frequency
vs FBX
T
A
= 25°C, unless otherwise noted.
FBX VOLTAGE (V)
–0.8
0
NORMALIZED FREQUENCY (%)
20
40
60
80
120
–0.4
0 0.4 0.8
3757 G06
1.2 1.6
100
–75 –50 0 50 75–25 25 100 150125
TEMPERATURE (°C)
100
SENSE THRESHOLD (mV)
105
110
115
120
3757 G08
DUTY CYCLE (%)
0
95
SENSE THRESHOLD (mV)
105
20 40 8060
115
100
110
100
3757 G09
SHDN/UVLO VOLTAGE (V)
0
0
SHDN/UVLO CURRENT (µA)
20
10 20 30
40
10
30
40
3757 G11
–75 –50 0 50 75–25 25 100 150125
TEMPERATURE (°C)
1.6
I
SHDN/ UVLO
(µA)
1.8
2.0
2.2
2.4
3757 G12
SWITCHING FREQUENCY (KHz)
0
0
I
Q
(mA)
15
20
35
300
500 600
700
10
5
25
30
100 200
400
900800
1000
3757 G04
C
L
= 3300pF
SWITCHING FREQUENCY (KHz)
0
10
R
T
(kΩ)
100
1000
300
500 600
700
100 200
400
900800
1000
3757 G05
–75 –50 0 50 75–25 25 100 150125
TEMPERATURE (°C)
270
SWITCHING FREQUENCY (kHz)
280
290
300
310
330
3757 G07
320
R
T
= 41.2K
–75 –50 0 50 75–25 25 100 150125
TEMPERATURE (°C)
1.18
SHDN/UVLO VOLTAGE (V)
1.22
1.24
1.26
1.28
1.20
3757 G10
SHDN/UVLO FALLING
SHDN/UVLO RISING