LT3745 데이터 시트보기 (PDF) - Linear Technology

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LT3745

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

Gate Driver

VBIAS

ICAP

LED Driver

CAP Bias Voltage (VIN – VCAP)

CAP Bias Current Limit

GATE High Level (VIN – VGATE)

GATE Low Level (VGATE – VCAP)

GATE Rise Time

GATE Fall Time

7V < VIN < 55V

(VIN – VCAP) = VBIAS – 0.5V

IGATE = –100mA

IGATE = 100mA

CGATE = 3.3nF to VIN

CGATE = 3.3nF to VIN

6.5

6.8

7.1

V

22

mA

0.4

V

0.3

V

30

ns

30

ns

VISET

ILED

Trimmed ISET Pin Voltage

LEDxx Operating Voltage

LEDxx Leakage Current

LED Constant Sink Current

∆ILEDC

∆ILEDD

∆ILINE

∆ILOAD

VOPEN

VSHT

TLEDON

Current Mismatch Between Channels

Current Mismatch Between Devices

LED Current Line Regulation

LED Current Load Regulation

Open LED Threshold

Short LED Threshold

Minimum LED On-Time

PWMCK LOGIC

High Level Voltage

Low Level Voltage

l 1.181 1.205 1.229

V

VIN = 48V, VISP = VISN = VLEDxx

l

36

V

LED Channel Off, VIN = 48V,

VISP = VISN = 36V, VLEDxx = 24V

0.2

µA

VISP = VISN = 5V, VLEDxx = 1V

REGDC = 0x00

REGDC = 0x20

REGDC = 0x3F

l 23.5 25.3

27

mA

l 48

50.5

53

mA

l 71

74

77

mA

VISP = VISN = 5V, VLEDxx = 1V,

l

±1

±3

%

REGDC = 0x20 (Note 6)

VISP = VISN = 5V, VLEDxx = 1V,

l

±1

±3

%

REGDC = 0x20 (Note 7)

VISP = VISN = 5V, VLEDxx = 1V,

REGDC = 0x20, VCC = 3V to 5.5V (Note 8)

0.1

0.2

%/V

VISP = VISN = 5V, REGDC = 0x20,

VLEDxx = 1V to 3V (Note 9)

0.1

0.2

%/V

VISP = VISN = 5V, VLEDxx Falling

0.35

V

VISP = VISN = 5V, VLEDxx Rising

3.7

3.9

4.1

V

VISP = VISN = 5V, REGGS = 0x001

0.5

µs

VCC = 3V to 5.5V

2.4

VCC

V

0

0.6

V

Thermal Protection

ITSET

TSET Output Current

TSET Over Temperature Threshold

Serial Data Interface

VTSET = 1V

TA = 25°C

l 19.0 19.8 20.6

µA

510

mV

Single-Ended Input (Note 10)

VSIH

High Level Voltage

VSIL

Low Level Voltage

ISI

Single-Ended Input Current

Single-Ended Output (Note 10)

VSOH

High Level Voltage

VSOL

Low Level Voltage

VCC = 3V to 5.5V

VCC = 3V to 5.5V, SI = VCC or GND

VCC = 3V to 5.5V

ISO = –1mA

ISO = 1mA

2.4

0

–0.2

VCC – 0.1

VCC

V

0.6

V

0.2

µA

V

V

0.1

V

3745f

4

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