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LTC3401

3401fa

The q denotes specifications that apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

VIN = 1.2V, VOUT = 3.3V unless otherwise noted.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

PGOOD Low Voltage

IPGOOD = 1mA

0.1

0.2

VOUT = 1V, IPGOOD = 20µA

0.1

0.4

PGOOD Leakage

VPGOOD = 5.5V

0.01

µA

SHDN Input High

VSHDN = VIN = VOUT

SHDN Input Low

0.4

SHDN Input Current

VSHDN = 5.5V

0.01

µA

Thermal Shutdown

170

°C

ELECTRICAL CHARACTERISTICS

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

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 VOUT since the supply current is

bootstrapped to the VOUT pin and in the application will reflect to the input

supply by (VOUT/VIN) • Efficiency. The outputs are not switching.

Note 4: Once the output is started, the IC is not dependant upon the VIN

supply.

Switching Waveform on SW Pin

TYPICAL PERFOR A CE CHARACTERISTICS

SW Pin and Inductor Current (IC)

in Discontinuous Mode. Ringing

Control Circuitry Eliminates High

Frequency Ringing

Transient Response 5mA to 50mA

1V/DIV

50ns/DIV

3401 G01

1V/DIV

200ns/DIV

3401 G02

50mA/DIV

IOUT

COUT = 22µF

200

µs/DIV

3401 G03

L = 3.3

µH

fOSC = 1MHz

VOUT

100mV/DIV

50mA

5mA

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