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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 V CC supply current with LED channel on highly depends on
the LED current setting and LEDxx pin voltage; its test condition is
R ISET = 60.4k, REG DC = 0x3F, REG GS = 0xFFF, V ISP = V ISN = 5V,
V LEDxx = 1V. The V CC supply current with serial data interface on highly
depends on V CC supply voltage, serial data interface clock frequency,
SCKO/SDO/LDO loading capacitance, and PWMCK clock frequency; its
test condition is V CC = 3.3V, f SCKI = 30MHz, C SCKO = C SDO = C LDO = 15pF,
f PWMCK = 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
6
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