Datasheet

LTC3428
3
3428fb
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 specifi cations
from 0°C to 70°C. Specifi cations over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Specifi cation 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 specifi ed maximum operating junction
temperature may impair device reliability.
SWA, SWB Switching Waveforms
SW Pin and Inductor Current in
Discontinuous Mode, Demonstrating
Anti-Ring Circuit Operation Transient Response, 0.5A to 1.5A
3428 G01
500ns/DIV
5V/DIV
SWA
SWB
3428 G02
500ns/DIV
2V/DIV
500mA/DIV
3428 G03
100µs/DIV
100mV/DIV
500mA/DIV
TYPICAL PERFORMANCE CHARACTERISTICS
All characteristic curves at T
A
= 25°C unless otherwise noted.
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.3V, V
OUT
= 5V unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
NMOS Switch Leakage V
SWA
, V
SWB
= 5.5V, Per Phase 0.1 2.5 µA
NMOS Switch On Resistance V
OUT
= 5V, Per Phase 0.093 
NMOS Current Limit Per Phase
l
2 2.5 A
SHDN Input Threshold
l
0.4 0.8 1.5 V
SHDN Input Current 0.01 1 µA
Maximum Duty Cycle
l
80 87 %
Minimum Duty Cycle
l
0%
Current Limit Delay to Output (Note 3) 400 ns