LT3669 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LT3669 Datasheet PDF : 40 Pages
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LT3669/LT3669-2
SWITCHING CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VL+ = 24V. (Note 4)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Receiver
Noise Suppression Time
tPHLR, tPLHR Propagation Delay
tSKEWR
Receiver Skew
CCQI
CQ1 Pin Input Capacitance
VSR ≤ 0.4V (for COM1/COM2) (Figure 5)
VSR ≥ 0.9V (for COM3) (Figure 5)
l 1/16
l 1/16
3.5/16
TBIT
5/16
TBIT
RXD1 Pull-Up Resistor = 5k (Figure 4)
VSR ≤ 0.4V (for COM1/COM2)
l
VSR ≥ 0.9V (for COM3)
l
4.6
6.5
µs
1.45
2.1
µs
tSKEWR = |tPHLR – tPLHR|, RXD1 RPU = 5k (Figure 4)
VSR ≤ 0.4V (for COM1/COM2)
l
VSR ≥ 0.9V (for COM3)
l
0.5
1.5
µs
100
400
ns
20
pF
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: All voltages are with respect to GND. All currents into device pins
are positive; all currents out of device pins are negative.
Note 3: Absolute maximum voltage at L+, EN/UVLO, DIO and LDOIN pins
is 60V for non-repetitive one second transients, and 40V for continuous
operation.
Note 4: The LT3669E 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
LT3669I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT3669H is guaranteed over the full –40°C to
150°C operating junction temperature range. Specifications for the line
driver do not apply above the thermal shutdown temperature.
Note 5: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions and will shut the
line drivers off for typical junction temperatures higher than 140°C. The
LDO and switching regulator will shut off for typical junction temperatures
higher than 168°C. Continuous operation above the specified maximum
operating junction temperature may impair device reliability.
Note 6: Current limit guaranteed by design and/or correlation to static test.
Slope compensation reduces current limit at higher duty cycles.
Note 7: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the NPN power switch.
Note 8: Thermal shutdown guaranteed by design and/or correlation to
static test.
Note 9: Handshake sequence: set TXEN1 low and then toggle TXD1.
3669fa
6
For more information www.linear.com/LT3669
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