Datasheet
LTM8040
3
8040fa
ELECTRICAL CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: This μModule includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specifi ed maximum operating junction
temperature may impair device reliability.
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 12V, SHDN = 5V, V
PWM
= 5V, unless otherwise noted (Note 3).
PARAMETER CONDITIONS MIN TYP MAX UNITS
LEDA Clamp Voltage 13.2 14.5 V
Minimum BIAS Voltage 2.0 2.6 V
Note 3: The LTM8040E is guaranteed to meet performance specifi cations
from 0°C to 125°C internal. Specifi cations over the full –40°C to
125°C internal operating temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTM8040I is guaranteed to meet specifi cations over the full –40°C to 125°C
internal operating temperature range. Note that the maximum internal
temperature is determined by specifi c operating conditions in conjunction
with board layout, the rated package thermal resistance and other
environmental factors.
TYPICAL PERFORMANCE CHARACTERISTICS
Effi ciency–Single 3.3V at 1A LED Effi ciency–Two 3.3V at 1A LEDs Effi ciency–Three 3.3V at 1A LEDs
Effi ciency–Single 2.7V at 1A LED Effi ciency–Three 2.7V at 1A LEDs Effi ciency–Four 2.7V at 1A LEDs
OUTPUT CURRENT (mA)
0
50
EFFICIENCY (%)
55
65
70
75
85
200
400
8040 G01
60
80
600
800 1000
24 V
IN
12 V
IN
5 V
IN
OUTPUT CURRENT (mA)
0
0
EFFICIENCY (%)
10
30
40
50
70
200
400
8040 G02
20
80
100
90
60
600
800 1000
24 V
IN
12 V
IN
OUTPUT CURRENT (mA)
0
0
EFFICIENCY (%)
10
30
40
50
70
200
400
8040 G03
20
80
100
90
60
600
800 1000
24 V
IN
12 V
IN
OUTPUT CURRENT (mA)
0
0
EFFICIENCY (%)
10
30
40
50
70
200
400
8040 G05
20
80
100
90
60
600
800 1000
24 V
IN
12 V
IN
OUTPUT CURRENT (mA)
0
0
EFFICIENCY (%)
10
30
40
50
70
200
400
8040 G04
20
80
90
60
600
800 1000
24 V
IN
12 V
IN
5 V
IN
OUTPUT CURRENT (mA)
0
0
EFFICIENCY (%)
10
30
40
50
70
200
400
8040 G06
20
80
100
90
60
600
800 1000
24 V
IN
12 V
IN
(T
A
= 25°C, confi gured per Table 2 unless
otherwise noted)