Datasheet

3
LTC3401
3401fb
The ● denotes specifications that apply over the full operating temperature range, otherwise specifications are at T
A
= 25°C.
V
IN
= 1.2V, V
OUT
= 3.3V unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
PGOOD Low Voltage I
PGOOD
= 1mA 0.1 0.2 V
V
OUT
= 1V, I
PGOOD
= 20μA 0.1 0.4 V
PGOOD Leakage V
PGOOD
= 5.5V 0.01 1 μA
SHDN Input High V
SHDN
= V
IN
= V
OUT
1V
SHDN Input Low 0.4 V
SHDN Input Current V
SHDN
= 5.5V 0.01 1 μA
Thermal Shutdown 170 °C
ELECTRICAL CHARACTERISTICS
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 LTC3401 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: Current is measured into V
OUT
since the supply current is
bootstrapped to the V
OUT
pin and in the application will reflect to the input
supply by (V
OUT
/V
IN
) • I/ Efficiency. The outputs are not switching.
Note 4: Once the output is started, the IC is not dependant upon the V
IN
supply.
Switching Waveform on SW Pin
TYPICAL PERFOR A CE CHARACTERISTICS
UW
SW Pin and Inductor Current (I
C
)
in Discontinuous Mode. Ringing
Control Circuitry Eliminates High
Frequency Ringing Transient Response 5mA to 50mA
SW
1V/DIV
50ns/DIV
3401 G01
SW
1V/DIV
200ns/DIV
3401 G02
0V
0A
I
L
50mA/DIV
I
OUT
C
OUT
= 22μF 200μs/DIV 3401 G03
L = 3.3μH
f
OSC
= 1MHz
V
OUT
100mV/DIV
50mA
5mA