LT3745 데이터 시트보기 (PDF) - Linear Technology

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LT3745

16-Channel 50mA LED Driver with Buck Controller

Linear Technology 

LT3745

Electrical Characteristics

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 LT3745E 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

LT3745I is guaranteed over the full –40°C to 125°C operating junction

temperature range.

Note 3: This IC includes thermal shutdown protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed 125°C when thermal shutdown protection is

active. Continuous operation above the specified maximum operating

junction temperature may impair device reliability.

Note 4: The VCC supply current with LED channel on highly depends on

the LED current setting and LEDxx pin voltage; its test condition is

RISET = 60.4k, REGDC = 0x3F, REGGS = 0xFFF, VISP = VISN = 5V,

VLEDxx = 1V. The VCC supply current with serial data interface on highly

depends on VCC supply voltage, serial data interface clock frequency,

SCKO/SDO/LDO loading capacitance, and PWMCK clock frequency; its

test condition is VCC = 3.3V, fSCKI = 30MHz, CSCKO = CSDO = CLDO = 15pF,

fPWMCK = 409.6KHz.

Note 5: The SYNC frequency must be higher than the RT programmed

oscillator frequency, and is suggested to be around 20% higher. Any SYNC

frequency higher than the suggested value may introduce sub-harmonic

oscillation in the converter due to insufficient slope compensation. See

Application Information section.

Note 6: The Current Mismatch between Channels is calculated as Equation

1 in Table 1.

Note 7: The Current Mismatch between Devices is calculated as Equations

2 and 3 in Table 1.

Note 8: The LED Current Line Regulation is calculated as Equation 4 in

Table 1.

Note 9: The LED Current Load Regulation is calculated as Equation 5 in

Table 1.

Note 10: The specifications of single-ended input SI apply to SCKI, SDI,

and LDI pins; the specifications of single-ended output SO apply to SCKO,

SDO, and LDO pins.

3745f

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