LT3745EUJ 查看數據表（PDF） - Linear Technology

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LT3745EUJ

16-Channel 50mA LED Driver with Buck Controller

Linear Technology 

LT3745

Electrical Characteristics The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VCC = 3.3V, VEN/UVLO = 1.5V, VFB = 1.5V,

VISP = VISN = 0V, RT = 105k, RISET = 60.4k, CCAP = 0.47µF to VIN, unless otherwise noted.

SYMBOL

PARAMETER

CONDITIONS

MIN TYP MAX

UNITS

Supply

VIN

VIN Operating Voltage

IVIN

VIN Supply Current

VEN/UVLO = 0V

No Switching

l

6

55

V

0.2

2

µA

0.4

0.55

mA

VCC

VCC Operating Voltage

IVCC

VCC Supply Current (Note 4)

VEN/UVLO = 0V

LED Channel Off, 30MHz Data Off

LED Channel On, 30MHz Data Off

LED Channel On, 30MHz Data On

l

3

5.5

V

0.1

1

µA

3.1

3.6

mA

7

mA

16

mA

Undervoltage Lockout (UVLO)

VCC UVLO Threshold

EN/UVLO Shutdown Threshold

UVLO Threshold

IEN/UVLO

EN/UVLO Bias Current

(VIN – VCAP) UVLO Threshold

Soft-Start (SS)

VCC Rising

VCC Falling

IVCC <20µA

VEN/UVLO Rising

VEN/UVLO Falling

VEN/UVLO = VCC = 3.3V

(VIN – VCAP) Rising

(VIN – VCAP) Falling

2.82 2.89 2.96

V

2.61 2.68 2.75

V

0.35

V

1.28 1.31 1.34

V

1.19 1.22 1.25

V

0.1

1

µA

4.6

4.9

5.2

V

4.2

4.5

4.8

V

ISS

VSS(TH)

Oscillator

Soft-Start Charge Current

Soft-Start Discharge Current

Soft-Start Reset Threshold

VSS = 1V

VSS = VCC, VEN/UVLO = 1V

–16

–12

–8

µA

330

µA

0.35

V

VRT

IRT

fOSC

fSYNC

RT Pin Voltage

RT Pin Current Limit

Oscillator Frequency

Sync Frequency Range (Note 5)

SYNC LOGIC

High Level Voltage

Low Level Voltage

VRT = 0V

RT = 280k

RT = 105k

RT = 46.4k

RT = 348k

VCC = 3V to 5.5V

1.186 1.205 1.224

V

–80

µA

188

200

212

kHz

475

500

525

kHz

965 1015 1065

kHz

200

1000

kHz

2.4

VCC

V

0

0.6

V

Error Amplifiers and Loop Dynamics

VFB

FB Regulation Voltage

IFB

FB Input Bias Current

LED Regulation Voltage

TOFF(MIN)

Minimum GATE Off-Time

TON(MIN)

Minimum GATE On-Time

Current Sense Amplifier

VISN = 5V

l 1.186 1.210 1.234

V

VISN = 5V, VFB Regulated

–120

nA

VISN = 5V, VFB = 1V

0.63 0.715 0.8

V

VISP = VISN = 5V, VFB = 1V

120

ns

(VISP – VISN) = 60mV, VISN = 5V, VFB = 1V

200

ns

ISP/ISN Pin Common Mode

VISP = VISN

VIN to ISN Dropout Voltage (VIN – VISN)

VISP = VISN, VFB = 1V

Current Limit Sense Threshold (VISP – VISN) VFB = 1V

IISP

ISP Input Bias Current

IISN

ISN Input Bias Current

l

0

36

V

l

1.7

2.1

V

34

46.5

59

mV

–24

µA

–48

µA

3745f

3

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