Datasheet

LT3689/LT3689-5
7
3689fe
For more information www.linear.com/LT3689
TYPICAL PERFORMANCE CHARACTERISTICS
EN/UVLO Pin Current EN/UVLO Pin Threshold Boost Diode Forward Voltage
EN/UVLO Hysteresis Current
Switching Waveform:
Burst Mode Operation
Switching Waveform:
Transition from Burst Mode
to Full Frequency
Switching Waveform:
Full Frequency Continuous Operation
Power-On-Reset Threshold
vs Temperature
V
EN/UVLO
(V)
EN/UVLO PIN CURRENT (µA)
3689 G22
0 5
10
15 20 3025 35
6
7
5
4
1
0
3
2
T
A
= 150°C
T
A
= –50°C
T
A
= 25°C
TEMPERATURE (°C)
–50
1.200
EN/UVLO THRESHOLD (V)
1.220
1.240
1.260
–25
0
25 50 10075 125
1.280
1.300
1.210
1.230
1.250
1.270
1.290
150
3689 G23
EN/UVLO THRESHOLD RISING
EN/UVLO THRESHOLD FALLING
V
IN
= 12V
BOOST DIODE CURRENT (mA)
BOOST DIODE VOLTAGE (mV)
3689 G24
0 10
20
30 40 50
600
700
800
500
400
100
0
300
900
200
T
A
= 150°C
T
A
= 25°C
T
A
= –50°C
TEMPERATURE (°C)
3.0
3.5
4.0
4.5
3689 G25
–50 –25
0
25 50 10075 125 150
5µs/DIV
V
OUT
10mV/DIV
V
IN
= 12V, FRONT PAGE APPLICATION
I
LOAD
= 6mA
V
SW
5V/DIV
I
L
0.2A/DIV
3689 G26
1µs/DIV
V
OUT
10mV/DIV
V
IN
= 12V, FRONT PAGE APPLICATION
I
LOAD
= 60mA
V
SW
5V/DIV
I
L
0.2A/DIV
3689 G27
1µs/DIV
V
OUT
10mV/DIV
V
IN
= 12V, FRONT PAGE APPLICATION
I
LOAD
= 600mA
V
SW
10V/DIV
I
L
0.5A/DIV
3689 G28
TEMPERATURE (°C)
0.710
POR THRESHOLD (V)
0.715
0.720
0.725
0.730
3689 G29
–50 –25
0
25 50 10075 125 150