LTC3428_15 Datasheet, PDF (3/12 Pages) Linear Technology – 4A, 2MHz Dual Phase Step-Up DC/DC Converter in 3mm 3mm DFN

LTC3428
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 3.3V, V_OUT = 5V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX
NMOS Switch Leakage
NMOS Switch On Resistance
NMOS Current Limit
SHDN Input Threshold
SHDN Input Current
V_SWA, V_SWB = 5.5V, Per Phase
V_OUT = 5V, Per Phase
Per Phase
0.1
2.5
0.093
l
2
2.5
l 0.4
0.8
1.5
0.01
1
Maximum Duty Cycle
l 80
87
Minimum Duty Cycle
l
0
Current Limit Delay to Output
(Note 3)
400
UNITS
μA
Ω
A
V
μA
%
%
ns
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 LTC3428E is guaranteed to meet performance specifications
from 0°C to 70°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: Specification is guaranteed by design and not 100% tested in
production.
Note 4: 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.
TYPICAL PERFORMANCE CHARACTERISTICS
All characteristic curves at T_A = 25°C unless otherwise noted.
SWA, SWB Switching Waveforms
SW Pin and Inductor Current in
Discontinuous Mode, Demonstrating
Anti-Ring Circuit Operation
Transient Response, 0.5A to 1.5A
SWA
5V/DIV
SWB
2V/DIV
500ns/DIV
500mA/DIV
3428 G01
100mV/DIV
500ns/DIV
500mA/DIV
3428 G02
100μs/DIV
3428 G03
3428fb
3