LTC3115-2_15 Datasheet, PDF (4/42 Pages) Linear Technology – 40V, 2A Synchronous Buck-Boost DC/DC Converter

LTC3115-2
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.
Typical Performance Characteristics (T_A = 25°C unless otherwise specified)
PWM Mode Efficiency, V_OUT = 5V,
f_SW = 500kHz, Non-Bootstrapped
100
90
80
70
60
50
40
30
20
0.01
V_IN = 3.6V
V_IN = 5V
V_IN = 12V
V_IN = 24V
V_IN = 36V
0.10
1
LOAD CURRENT (A)
31152 G01
PWM Mode Efficiency, V_OUT = 5V,
f_SW = 1MHz, Non-Bootstrapped
100
90
80
70
60
50
40
30
20
0.01
V_IN = 3.6V
V_IN = 5V
V_IN = 12V
V_IN = 24V
V_IN = 36V
0.1
1
LOAD CURRENT (A)
31152 G04
PWM Mode Efficiency,
V_OUT = 12V, f_SW = 500kHz
100
90
80
70
60
50
40
30
0.01
V_IN = 5V
V_IN = 12V
V_IN = 24V
V_IN = 36V
0.1
LOAD CURRENT (A)
1
31152 G02
PWM Mode Efficiency,
V_OUT = 12V, f_SW = 1MHz
100
90
80
70
60
50
40
30
0.01
V_IN = 5V
V_IN = 12V
V_IN = 24V
V_IN = 36V
0.1
LOAD CURRENT (A)
1
31152 G05
4
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PWM Mode Efficiency,
V_OUT = 24V, f_SW = 500kHz
100
90
80
70
60
50
40
30
0.01
V_IN = 12V
V_IN = 18V
V_IN = 24V
V_IN = 36V
0.1
LOAD CURRENT (A)
1
31152 G03
PWM Mode Efficiency,
V_OUT = 24V, f_SW = 1MHz
100
90
80
70
60
50
40
30
0.01
V_IN = 12V
V_IN = 18V
V_IN = 24V
V_IN = 36V
0.1
LOAD CURRENT (A)
1
31152 G06
31152fa