LT3689 datasheet(4/32 Pages) LINER

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LT3689/LT3689-5

3689fa

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

tUV

UV Detect to RST Asserted

Step VFB from 0.9V to 0.5V

μs

WDI Input Threshold

0.4

0.95

1.15

WDI Input Pull-Up Current

–2

μA

WDI Input Pulse Width

300

W/T Threshold Voltage

0.4

0.8

W/T Input Pull-Down Current

2.6

μA

WDE Threshold Voltage

0.4

0.8

WDO Pull-Up Current (Note 6)

–0.6

–0.85

μA

RST Pull-Up Current (Note 6)

–0.6

–0.85

μA

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: Absolute maximum voltage at VIN and EN/UVLO pins is 60V for

nonrepetitive 1 second transients, and 36V for continuous operation.

Note 3: The LT3689E 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

LT3689I is guaranteed over the full –40°C to 125°C operating junction

temperature range. The LT3689H is guaranteed over the full –40°C to

150°C operating junction temperature range. High junction temperatures

degrade operating lifetimes. Operating lifetime is derated at junction

temperatures greater than 125°C.

Note 4: Current limit is guaranteed by design and/or correlation to static

test. Slope compensation reduces current limit at higher duty cycles.

Note 5: This IC includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed 150°C when overtemperature protection is active.

Continuous operation above the speciﬁed maximum operating junction

temperature may impair device reliability.

Note 6: The output of RST and WDO has a weak pull-up to VOUT of

typically 1μA. However, external pull-up resistors may be used when faster

rise times are required or for VOH higher than VOUT.

Note 7: Polarity speciﬁcation for all currents into pins is positive. All

voltages are referenced to GND unless otherwise speciﬁed.

Note 8: For the LT3689-5, VOUT is set to 5.5V to ensure the switching.

ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the full operating

junction temperature range, otherwise speciﬁcations are at TA = 25°C. VIN = 12V, VOUT = 5V, unless otherwise noted. (Note 3)

TYPICAL PERFORMANCE CHARACTERISTICS

Efﬁciency, VOUT = 5V

Efﬁciency, VOUT = 3.3V

Efﬁciency, VOUT = 1.8V

LOAD CURRENT (A)

0.4

0.2

0.6

0.3

0.1

0.5

0.7

3689 G01

TA = 25°C

f = 1MHz

VIN = 12V

VIN = 24V

VIN = 32V

0.4

0.2

0.6

0.3

0.1

0.5

0.7

LOAD CURRENT (A)

3689 G02

TA = 25°C

f = 700kHz

VIN = 12V

VIN = 24V

VIN = 32V

LOAD CURRENT (A)

3689 G03

TA = 25°C

f = 1MHz

VIN = 5V

VIN = 12V

0.4

0.2

0.6

0.3

0.1

0.5

0.7

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