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LT8580

8580fa

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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 LT8580E 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

LT8580I is guaranteed over the full –40°C to 125°C operating junction

temperature range. The LT8580H is guaranteed over the full –40°C to

150°C operating junction temperature range. Operating lifetime is derated

at junction temperatures greater than 125°C.

elecTrical characTerisTics The

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, VSHDN = VIN unless otherwise noted. (Note 2)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Operating Voltage Range

LT8580E, LT8580I

LT8580H

2.55

2.9

Positive Feedback Voltage

1.185

1.204

1.220

Negative Feedback Voltage

–3

Positive FBX Pin Bias Current

VFBX = Positive Feedback Voltage, Current Into Pin

83.3

µA

Negative FBX Pin Bias Current

VFBX = Negative Feedback Voltage, Current Out of Pin l

83.3

µA

Error Amplifier Transconductance

200

µmhos

Error Amplifier Voltage Gain

V/V

Quiescent Current

VSHDN = 2.5V, Not Switching

1.2

1.7

Quiescent Current in Shutdown

VSHDN = 0V

µA

Reference Line Regulation

2.5V ≤ VIN ≤ 40V

0.01

0.05

%/V

Switching Frequency, fOSC

RT = 56.2k

RT = 422k

1.23

165

1.5

200

1.77

235

MHz

kHz

Switching Frequency in Foldback

Compared to Normal fOSC

1/6

Ratio

Switching Frequency Set Range

SYNCing or Free Running

200

1500

kHz

SYNC High Level for Synchronization

1.3

SYNC Low Level for Synchronization

0.4

SYNC Clock Pulse Duty Cycle

VSYNC = 0V to 2V

Recommended Minimum SYNC Ratio fSYNC/fOSC

3/4

Minimum Off-Time

100

Minimum On-Time

120

Switch Current Limit

Minimum Duty Cycle (Note 3)

Maximum Duty Cycle (Notes 3, 4), fOSC = 1.5MHz

Maximum Duty Cycle (Notes 3, 4), fOSC = 200kHz

1.2

0.6

0.4

1.5

0.8

1.8

1.5

1.4

Switch VCESAT

ISW = 0.75A

400

Switch Leakage Current

VSW = 5V

0.01

µA

Soft-Start Charging Current

VSS = 0.5V

µA

SHDN Minimum Input

Voltage High

Active Mode, SHDN Rising

Active Mode, SHDN Falling

1.23

1.21

1.31

1.27

1.4

1.33

SHDN Input Voltage Low

Shutdown Mode

0.3

SHDN Pin Bias Current

VSHDN = 3V

VSHDN = 1.3V

VSHDN = 0V

0.1

µA

SHDN Hysteresis

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

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

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.

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