LT3598 datasheet(3/24 Pages) LINER

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LT3598

3598fa

ELECTRICAL CHARACTERISTICS The l 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

Minimum Operating Voltage

3.2

Maximum Operating Voltage

Reference Voltage

1.216

1.210

1.230

1.260

Reference Voltage Line Regulation

3 < VIN < 30V, VC = 0.3V

0.01

0.03

%/V

Maximum VREF Pin Current

Out of Pin

200

μA

FB Pin Bias Current

VFB = 1.230V (Note 3)

100

250

FB Error Amp Transconductance

ΔI = 5μA

300

μmhos

FB Error Amp Voltage Gain

600

V/V

FB Pin Voltage

1.22

1.24

1.26

Current Loop Amp Transconductance

μmhos

Current Loop Amp Voltage Gain

V/V

VC Sink Current

μA

Quiescent Current

VSHDN = 5V, PWM = 0V, Not Switching

3.5

Quiescent Current in Shutdown

VSHDN = 0V

μA

ISET Voltage

VCTRL = 1.5V, VTSET = 1.5V, RISET = 14.7kΩ

0.985

1.000

1.015

LED Current

RISET = 14.7kΩ

19.5

20.7

LED String Current Matching

20mA LED Current

±0.5

±1.5

LED Open Detection Threshold

0.2

0.25

OPENLED Sink Current

2mA

Minimum LED Regulation Voltage

0.8

LED1-6 Leakage Current

VLED1-6 = 1V, VOUT = 5V, PWM = 0V

VLED1-6 = 42V, VOUT = 44V, PWM = 0V

0.1

0.2

μA

CTRL Pin Bias Current

VCTRL = 0.8V (Note 4)

125

Switching Frequency

RT = 309kΩ

RT = 51.1kΩ

RT = 14.7kΩ

171

0.9

2.25

190

2.5

209

1.1

2.75

kHz

MHz

TSET Voltage

602

Maximum Switch Duty Cycle

RT = 309kΩ

RT = 51.1kΩ

RT = 14.7kΩ

Switch Current Limit

(Note 5)

1.5

2.5

Switch VCESAT

ISW = 0.5A

0.12

Switch Leakage Current

VSW = 40V

0.2

μA

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