LTC3115-1
ELECTRICAL CHARACTERISTICS
The junction temperature (T
J
in °C) is calculated from the ambient
temperature (T
A
in °C) and power dissipation (P
D
in Watts) according to
the following formula:
T
J
= T
A
+ (P
D
•
θ
JA
)
where
θ
JA
is the thermal impedance of the package.
Note 3:
Current measurements are performed when the LTC3115-1 is
not switching. The current limit values measured in operation will be
somewhat higher due to the propagation delay of the comparators.
Note 4:
This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. The maximum
rated junction temperature will be exceeded when this protection is active.
Continuous operation above the specified absolute maximum operating
junction temperature may impair device reliability or permanently damage
the device.
Note 5:
Switch timing measurements are made in an open-loop test
configuration. Timing in the application may vary somewhat from these
values due to differences in the switch pin voltage during the non-overlap
durations when switch pin voltage is influenced by the magnitude and
direction of the inductor current.
TYPICAL PERFORMANCE CHARACTERISTICS
(T
A
= 25°C unless otherwise specified)
PWM Mode Efficiency, V
OUT
= 5V,
f
SW
= 500kHz, Non-Bootstrapped
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
0.01
0.10
LOAD CURRENT (A)
V
IN
= 3.6V
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
1
31151 G01
PWM Mode Efficiency,
V
OUT
= 12V, f
SW
= 500kHz
100
90
80
EFFICIENCY (%)
EFFICIENCY (%)
70
60
50
40
30
0.01
0.1
LOAD CURRENT (A)
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
1
31151 G02
PWM Mode Efficiency,
V
OUT
= 24V, f
SW
= 500kHz
100
90
80
70
60
50
40
30
0.01
0.1
LOAD CURRENT (A)
V
IN
= 12V
V
IN
= 18V
V
IN
= 24V
V
IN
= 36V
1
31151 G03
PWM Mode Efficiency, V
OUT
= 5V,
f
SW
= 1MHz, Non-Bootstrapped
100
90
80
EFFICIENCY (%)
EFFICIENCY (%)
70
60
50
40
30
20
0.01
0.1
LOAD CURRENT (A)
V
IN
= 3.6V
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
1
31151 G04
PWM Mode Efficiency,
V
OUT
= 12V, f
SW
= 1MHz
100
90
80
70
60
50
40
30
0.01
0.1
LOAD CURRENT (A)
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
1
31151 G05
PWM Mode Efficiency,
V
OUT
= 24V, f
SW
= 1MHz
100
90
80
EFFICIENCY (%)
70
60
50
40
30
0.01
0.1
LOAD CURRENT (A)
V
IN
= 12V
V
IN
= 18V
V
IN
= 24V
V
IN
= 36V
1
31151 G06
31151f
4
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
