RUN Pin Hysteresis Current 500 nA
RUN Pin Hysteresis Voltage 100 mV
Inductor Current Limit (Note 3) l2.4 3.0 3.7 A
Reverse Inductor Current Limit Current into PVOUT (Note 3) 1.5 A
Burst Mode Inductor Current Limit (Note 3) 0.65 1.0 1.35 A
Maximum Duty Cycle Percentage of Period SW2 is Low in Boost Mode,
RT= 35.7k (Note 5)
l90 95 %
Minimum Duty Cycle Percentage of Period SW1 is High in Buck Mode,
RT= 35.7k (Note 5)
l0 %
SW1, SW2 Minimum Low Time RT= 35.7k (Note 5) 100 ns
N-Channel Switch Resistance Switch A (From PVIN to SW1)
Switch B (From SW1 to PGND)
Switch C (From SW2 to PGND)
Switch D (From PVOUT to SW2)
150
150
150
150
mΩ
mΩ
mΩ
mΩ
N-Channel Switch Leakage PVIN = PVOUT = 40V 0.1 10 µA
PVCC/VCC External Forcing Voltage 4.58 5.5 V
VCC Regulation Voltage IVCC = 1mA 4.33 4.45 4.58 V
VCC Load Regulation IVCC = 1mA to 20mA 1.2 %
VCC Line Regulation IVCC = 1mA, VIN = 5V to 40V 0.5 %
VCC Current Limit VCC = 2.5V 50 110 mA
VCC Dropout Voltage IVCC = 5mA, VIN = 2.7V 50 mV
VCC Reverse Current VCC = 5V, VIN = 3.6V 10 µA
LTC3115-1
4
Rev. C
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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:The LTC3115-1 is tested under pulsed load conditions such
that TJ≈ TA. The LTC3115E-1 is guaranteed to meet specifications
from 0°C to 85°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are ensured by design,
characterization and correlation with statistical process controls. The
LTC3115I-1 specifications are guaranteed over the –40°C to 125°C
operating junction temperature range. The LTC3115H-1 specifications are
guaranteed over the –40°C to 150°C operating junction temperature range.
The LTC3115MP-1 specifications are guaranteed over the –55°C to 150°C
operating junction temperature range. High junction temperatures degrade
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 (TJin °C) is calculated from the ambient
temperature (TAin °C) and power dissipation (PDin Watts) according to
the following formula:
TJ= TA+ (PD• θJA)
where θJA 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.
The ldenotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are for TA= 25°C (Note 2). PVIN = VIN = 24V, PVOUT = 5V, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
