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 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: Specification 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 specified 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

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

NMOS Switch Leakage

0.1

2.5

μA

NMOS Switch On Resistance

0.093

Ω

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