LTC3428

2

3428f

SWA, SWB Voltage, Pulsed, <100ns ......................... 7V

SHDN, VC Voltage ......................................... – 0.3 to 6V

Operating Temperature Range (Note 2) .. – 40°C to 85°C

Storage Temperature Range ..................–65°C to 125°C

ORDER PART

NUMBER

DD PART

MARKING

Consult LTC Marketing for parts specified with wider operating temperature ranges.

LBBG

ABSOLUTE

AXI U

RATI GS

PACKAGE/ORDER I FOR ATIO

(Note 1)

ELECTRICAL CHARACTERISTICS

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

of a device may be impaired.

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.

The

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum Startup Voltage

1.5

1.6

V

100

200

µA

1.3

2.0

mA

Shutdown Current

SHDN = 0V

1

µA

Switching Frequency

Per Phase

●

0.8

1.0

1.2

MHz

FB Regulated Voltage

●

1.219

1.243

1.268

V

FB Input Current

1

50

nA

Error Amp Transconductance

170

µS

Output Adjust Voltage

1.6

5.25

V

NMOS Switch Leakage

0.1

2.5

µA

NMOS Switch On Resistance

0.093

Ω

NMOS Current Limit

Per Phase

●

2

2.5

A

SHDN Input Threshold

●

0.4

0.8

1.5

V

SHDN Input Current

0.01

1

µA

Maximum Duty Cycle

●

80

87

%

Minimum Duty Cycle

●

0%

Current Limit Delay to Output

(Note 3)

40

ns

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.

TOP VIEW

DD PACKAGE

10-LEAD (3mm × 3mm) PLASTIC DFN

EXPOSED PAD MUST BE SOLDERED

TO GROUND PLANE ON PCB

10

9

6

7

8

4

5

3

2

1

PGNDB

SWB

AGND

FB

PGNDA

SWA

SHDN

11

LTC3428EDD