Datasheet

LTC3422
3
3422fa
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
reliabilty and lifetime.
Note 2: The LTC3422E 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: Once V
OUT
is greater than 2.4V, the LTC3422 is not dependent on
the V
IN
supply.
Note 4: Current is measured into the V
OUT
pin since the supply current is
bootstrapped to the output. The current will reflect to the input supply by
(V
OUT
/V
IN
) • Efficiency. The outputs are not switching.
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.
PARAMETER CONDITIONS MIN TYP MAX UNITS
SHDN Input High V
OUT
= 0V (Turn-On Threshold, Initial Start-Up) 1 V
V
OUT
> 2.4V (Stay-On Threshold) 0.65 V
SHDN Input Low Turn-Off Threshold 0.25 V
SHDN Input Current V
SHDN
= 3.3V ● 0.01 1 µA
Error Amp Transconductance 50 µS
Soft-Start Current Source V
SS
= 1V –5 –2.4 –1.2 µA
BURST Threshold Voltage Falling Edge, Sensed at the BURST Pin 0.79 0.88 0.97 V
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 1.2V, V
OUT
= 3.3V, R
T
= 28k, unless otherwise noted. (Note 2)