LTC3522_15 Datasheet, PDF (3/20 Pages) Linear Technology – Synchronous 400mA Buck-Boost and 200mA Buck Converters

LTC3522
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. PV_IN1 = PV_IN2 = 3.6V, V_OUT1 = 3.3V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Maximum Duty Cycle
V_FB2 = 0.54V
● 100
%
Minimum Duty Cycle
PGOOD Threshold
Power Good Hysteresis
V_FB2 = 0.66V
V_FB2 Falling
●
0
%
–11.3 –7.7 –4.1
%
2.5
%
Buck-Boost Converter
Output Voltage
● 2.2
5.25
V
PMOS Switch Resistance
0.29
Ω
NMOS Switch Resistance
0.22
Ω
NMOS Switch Leakage
PMOS Switch Leakage
V_SW1A = V_SW1B = 5V, PV_IN1 = PV_IN2 = 5V
V_SW1A = V_SW1B = 0V, PV_IN1 = PV_IN2 = 5V
0.1
5
μA
0.1
10
μA
Feedback Voltage
(Note 4)
● 0.97
1
1.03
V
Feedback Input Current
1
50
nA
Average Current Limit
(Note 3)
0.65 0.85
A
Burst Mode Current Limit
230
340
mA
Reverse Current Limit
(Note 3)
250
mA
Maximum Duty Cycle
Minimum Duty Cycle
PGOOD Threshold
Power Good Hysteresis
V_FB1 = 0.9V
V_FB1 = 1.1V
V_FB1 Falling
● 70
80
%
●
0
%
–12
–10
–8
%
2.5
%
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 LTC3522 is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Current measurements are performed when the LTC3522 is not
switching. The current limit values in operation will be somewhat higher
due to the propagation delay of the comparators.
Note 4: The LTC3522 is tested in a proprietary non-switching test mode
that connects each FB pin to the output of the respective error amplifier.
Note 5: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
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