LT3580

3

3580fg

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 LT3580E is guaranteed to meet performance specifications

from 0°C to 125°C junction temperature. Specifications over the –40°C

to 125°C operating junction temperature range are assured by design,

characterization and correlation with statistical process controls. The

LT3580I is guaranteed over the full –40°C to 125°C operating junction

temperature range. The LT3580H is guaranteed over the full –40°C to

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Operating Voltage Range

l

2.5

32

V

Positive Feedback Voltage

l

1.195

1.215

1.230

V

Negative Feedback Voltage

l

0

5

12

mV

Positive FB Pin Bias Current

l

81

83.3

85

μA

Negative FB Pin Bias Current

(LT3580E, LT3580I, LT3580MP)

(LT3580H)

l

l

81

81

83.3

83.3

85.5

86

μA

μA

Error Amplifier Transconductance

230

μmhos

Error Amplifier Voltage Gain

70

V/V

Quiescent Current

1

1.5

mA

Quiescent Current in Shutdown

0

1

μA

Reference Line Regulation

0.01

0.05

%/V

l

l

l

l

1.8

1.8

180

180

2

2

200

200

2.2

2.25

220

225

MHz

MHz

kHz

kHz

Switching Frequency in Foldback

1/4

Ratio

Switching Frequency Set Range

SYNCing or Free Running

l

200

2500

kHz

SYNC High Level for Synchronization

l

1.3

V

SYNC Low Level for Synchronization

l

0.4

V

SYNC Clock Pulse Duty Cycle

35

65

%

3/4

Minimum Off-Time

60

ns

Minimum On-Time

100

ns

Switch Current Limit

Minimum Duty Cycle (Note3) (LT3580E, LT3580I, LT3580H)

Minimum Duty Cycle (Note3) (LT3580MP)

Maximum Duty Cycle (Notes 3, 4) (LT3580E, LT3580I,

LT3580MP)

Maximum Duty Cycle (Notes 3, 4) (LT3580H)

l

l

l

l

2.2

2.15

1.6

1.55

2.5

2.2

1.9

1.9

2.8

2.8

2.6

2.6

A

A

A

A

300

mV

Switch Leakage Current

0.01

1

μA

Soft-Start Charging Current

l

468

μA

SHDN Minimum Input

Voltage High

Active Mode, SHDN Rising (LT3580E, LT3580I)

Active Mode, SHDN Rising (LT3580H, LT3580MP)

Active Mode, SHDN Falling (LT3580E, LT3580I)

Active Mode, SHDN Falling (LT3580H, LT3580MP)

l

l

l

l

1.27

1.25

1.24

1.22

1.32

1.32

1.29

1.29

1.38

1.4

1.33

1.35

V

V

V

V

SHDN Input Voltage Low

Shutdown Mode

l

0.3

V

SHDN Pin Bias Current

9.7

40

11.6

0

60

13.4

0.1

μA

μA

μA

150°C operating junction temperature range. The LT3580MP is guaranteed

over the full –55°C to 125°C operating junction temperature range.

Operating lifetime is derated at junction temperatures greater than 125°C.

Note 3: Current limit guaranteed by design and/or correlation to static test.

Note 4: Current limit measured at equivalent switching frequency of 2.5MHz.

Note 5: This IC includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed 150°C when overtemperature protection is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.