Datasheet

LT3688
6
3688f
TYPICAL PERFORMANCE CHARACTERISTICS
Switching Frequency vs R
T
Switching Frequency
vs Temperature
Minimum Switch On-Time
EN/UVLO Pin Current
EN/UVLO Pin Threshold Boost Diode Forward Voltage
Switching Waveforms,
Burst Mode Operation
Switching Waveforms,
Transition from Burst Mode
to Full Frequency
Switching Waveforms, Full
Frequency Continuous Operation
T
A
= 25°C unless otherwise noted.
TEMPERATURE (°C)
R
T
= 49.9k
–50 –25 25 500 100 12575 150
0.0
SWITCHING FREQUENCY (MHz)
0.2
0.8
0.6
0.4
1.2
1.0
3688 G14
TEMPERATURE (°C)
I
SW
= 700mA
–50 –20 25 500 100 12575 150
0
MINIMUM ON TIME (ns)
50
150
100
200
3688 G16
PIN VOLTAGE (V)
0 5 15 2010 30 3525 40
0
PIN CURRENT (µA)
5
15
20
10
25
3688 G17
TEMPERATURE (°C)
THRESHOLD FALLING
–50 –25 25 500 100 12575 150
1.00
EN/UVLO PIN THRESHOLD (V)
1.10
1.30
1.40
1.20
1.50
3688 G18
CURRENT (mA)
0 1020304050
0
FORWARD VOLTAGE (mV)
100
500
600
700
800
200
300
400
900
3688 G19
I
L
0.2A/DIV
V
IN
= 12V; FRONT PAGE APPLICATION
I
LOAD
= 40mA
V
SW
5V/DIV
V
OUT
10mV/DIV
5µs/DIV
3688 G21
I
L
0.2A/DIV
V
IN
= 12V; FRONT PAGE APPLICATION
I
LOAD
= 160mA
V
SW
5V/DIV
V
OUT
10mV/DIV
5µs/DIV
3688 G22
R
T
(k)
0 10050 150 200
0
SWITCHING FREQUENCY (MHz)
0.5
1.5
2.0
1.0
2.5
3688 G13
I
L
0.2A/DIV
V
IN
= 12V; FRONT PAGE APPLICATION
I
LOAD
= 7mA
V
SW
5V/DIV
V
OUT
10mV/DIV
5µs/DIV
3688 G20