LTC3780_12 Datasheet, PDF (5/28 Pages) Linear Technology – High Effi ciency, Synchronous, 4-Switch Buck-Boost Controller

LTC3780
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T_A = 25°C. V_IN = 15V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
PGOOD Output
∆V_FBH
∆V_FBL
∆V_FB(HYST)
V_PGL
I_PGOOD
PGOOD Upper Threshold
PGOOD Lower Threshold
PGOOD Hysteresis
PGOOD Low Voltage
PGOOD Leakage Current
V_OSENSE Rising
V_OSENSE Falling
V_OSENSE Returning
I_PGOOD = 2mA
V_PGOOD = 5V
5.5
7.5
10
%
–5.5 –7.5 –10
%
2.5
%
0.1
0.3
V
±1
μA
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: T_J for the QFN package is calculated from the temperature T_A and
power dissipation P_D according to the following formula:
T_J = T_A + (P_D • 34°C/W)
Note 3: The IC is tested in a feedback loop that servos V_ITH to a specified
voltage and measures the resultant V_OSENSE.
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 5: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 6: The minimum on-time condition is specified for an inductor
peak-to-peak ripple current ≥ 40% of I_MAX (see minimum on-time
considerations in the Applications Information section).
Note 7: The LTC3780E is guaranteed to meet performance specifications
from 0°C to 85°C. Performance over the –40°C to 85°C operating junction
temperature range is assured by design, characterization and correlation
with statistical process controls. The LTC3780I is guaranteed over the
–40°C to 125°C operating junction temperature range. The LTC3780MP
is guaranteed and tested over the full –55 to 125°C operating junction
temperature range.
Note 8: This parameter is guaranteed by design.
Note 9: f_OSC is the running frequency for the application.
3780fe
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