LTC3458

3

3458fa

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Error Amplifier Sink Current

7

μA

SYNC Input High

●

1.5

V

SYNC Input Low

●

0.35

V

SHDN Input High

●

1.25

V

SHDN Input Low

●

0.3

V

BURST Mode Peak Current

0.4

A

BURST Threshold Voltage

1.10

V

The

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: 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.

Note 3: The LTC3458 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.

TYPICAL PERFOR A CE CHARACTERISTICS

TEMPERATURE (

°C)

TEMPERATURE (

°C)

–40

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

10

15

60

3458 G03

3458 G01

3458 G02

5

0

–15

10

35

85

20

2000

1800

1600

1400

1200

1000

800

600

400

200

0

–200

L = 10

μH

3458 G04

3458 G05

3458 G06

50

200

300

100

150

250

160

140

120

100

80

60

40

20

0

1.5

250

200

150

100

50

0

3.0

4.0

5.5

2.0

2.5

3.5

4.5

5.0

OSCILLATOR FREQUENCY (kHz)

400

600

550

500

450

400

350

300

250

200

150

100

1200

600

800

1000

1400

OUT OF

BURST

INTO

BURST

–45

1.4

1.5

1,7

1.8

–15

15

30

90

1.6

–30

0

45

60

75

Burst Mode Quiescent Current

Maximum Load Current in Burst

Oscillator Programming Resistor

Current Limit Accuracy

Typical Burst Mode Threshold and