Datasheet
LTC3115-2
4
31152f
For more information www.linear.com/LTC3115-2
Typical perForMance characTerisTics
PWM Mode Efficiency, V
OUT
= 5V,
f
SW
= 1MHz, Non-Bootstrapped
PWM Mode Efficiency,
V
OUT
= 12V, f
SW
= 1MHz
PWM Mode Efficiency,
V
OUT
= 24V, f
SW
= 1MHz
PWM Mode Efficiency, V
OUT
= 5V,
f
SW
= 500kHz, Non-Bootstrapped
PWM Mode Efficiency,
V
OUT
= 12V, f
SW
= 500kHz
PWM Mode Efficiency,
V
OUT
= 24V, f
SW
= 500kHz
(T
A
= 25°C unless otherwise specified)
elecTrical characTerisTics
operating lifetime; operating lifetime is derated for junction temperatures
greater than 125°C. The maximum ambient temperature consistent with
these specifications is determined by specific operating conditions in
conjunction with board layout, the rated package thermal resistance and
other environmental factors.
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 LTC3115-2 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.
LOAD CURRENT (A)
0.01
60
EFFICIENCY (%)
80
100
0.10 1
31152 G01
40
50
70
90
30
20
V
IN
= 3.6V
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
LOAD CURRENT (A)
0.01
70
EFFICIENCY (%)
80
90
100
0.1 1
31152 G02
60
50
40
30
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
LOAD CURRENT (A)
0.01
70
EFFICIENCY (%)
80
90
0.1 1
31152 G03
60
30
50
40
100
V
IN
= 12V
V
IN
= 18V
V
IN
= 24V
V
IN
= 36V
LOAD CURRENT (A)
0.01
60
EFFICIENCY (%)
80
100
0.1 1
31152 G04
40
50
70
90
30
20
V
IN
= 3.6V
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
LOAD CURRENT (A)
0.01
70
EFFICIENCY (%)
80
90
100
0.1 1
31152 G05
60
50
40
30
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
LOAD CURRENT (A)
0.01
70
EFFICIENCY (%)
80
90
0.1 1
31152 G06
60
30
40
50
100
V
IN
= 12V
V
IN
= 18V
V
IN
= 24V
V
IN
= 36V