LT3579 datasheet(3/40 Pages) LINER

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LT3579/LT3579-1

35791f

ELECTRICAL CHARACTERISTICS

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum Input Voltage

2.3

2.5

VIN Overvoltage Lockout

16.2

18.7

21.2

Positive Feedback Voltage

1.195

1.215

1.230

Negative Feedback Voltage

Positive FB Pin Bias Current

VFB=Positive Feedback Voltage, Current into Pin

80.5

83.3

μA

Negative FB Pin Bias Current

VFB=Negative Feedback Voltage, Current out of Pin

83.3

85.5

μA

Error Amp Transconductance

ΔI=10μA

250

μmhos

Error Amp Voltage Gain

V/V

Quiescent Current

Not Switching

1.9

2.4

Quiescent Current in Shutdown

VSHDN = 0V

μA

Reference Line Regulation

2.5V ≤ VIN ≤ 15V

0.01

0.05

%/V

Switching Frequency, fOSC

RT = 34kΩ

2.2

2.5

2.8

MHz

RT = 432kΩ

175

200

225

kHz

Switching Frequency in Foldback

Compared to Normal fOSC

1/6

ratio

Switching Frequency Range

Free-Running or Synchronizing

200

2500

kHz

SYNC High Level for Sync

1.3

SYNC Low Level for Sync

0.4

SYNC Clock Pulse Duty Cycle

VSYNC = 0V to 2V

Recommended Minimum SYNC Ratio

fSYNC/fOSC

3/4

Minimum Off-Time

Minimum On-Time

SW1 Current Limit

At All Duty Cycles (Note 3)

3.4

4.2

5.1

SW Current Sharing, ISW2/ISW1

SW1 and SW2 Tied Together

0.78

A/A

SW1 + SW2 Current Limit

ISW2/ISW1 = 0.78, At All Duty Cycles (Note 3)

7.5

9.4

Switch VCESAT

SW1 and SW2 Tied Together, ISW1 + ISW2 = 5.5A

250

350

SW1 Leakage Current

VSW1 = 5V

0.01

μA

SW2 Leakage Current

VSW2 = 5V

0.01

μA

The

l denotes the speciﬁcations which apply over the full operating

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

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