Datasheet

3
LTC3402
3402fb
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
IN
= V
SHDN
1V
SHDN Input Low 0.4 V
SHDN Input Current V
SHDN
= 5.5V 0.01 1 μA
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 LTC3402E 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 the V
OUT
pin since the supply current is
bootstrapped to the output 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 dependent upon the V
IN
supply.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Switching Waveform on SW Pin
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
3402 G01
SW
1V/DIV
200ns/DIV
3402 G02
0V
0A
I
L
50mA/DIV
I
OUT
C
OUT
= 22μF 200μs/DIV 3402 G03
L = 3.3μH
f
OSC
= 1MHz
V
OUT
100mV/DIV
50mA
5mA
(T
A
= 25°C unless otherwise noted)
Transient Response 50mA to 500mA Burst Mode Operation
Burst Mode Operation
V
OUT
200mV/DIV
550mA
50mA
C
OUT
= 22μF 200μs/DIV 3402 G04
L = 3.3μH
f
OSC
= 1MHz
V
OUT
AC
100mV/DIV
V
IN
= 1.2V 5ms/DIV 3402 G05
V
OUT
= 3.3V
C
OUT
= 100μF
I
OUT
= 250μA
MODE/SYNC PIN = HIGH
SW
1V/DIV
V
OUT
AC
100mV/DIV
V
IN
= 1.2V 200μs/DIV 3402 G06
V
OUT
= 3.3V
C
OUT
= 100μF
I
OUT
= 20mA
MODE/SYNC PIN = HIGH
SW
1V/DIV