LTC3636 Ver la hoja de datos (PDF) - Linear Technology
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LTC3636 Datasheet PDF : 28 Pages
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LTC3636/LTC3636-1
Electrical Characteristics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TJ = 25°C (Note 2). VIN1 = VIN2 = 12V unless otherwise noted.
SYMBOL
RPGOOD
tPGOOD
tSS
ITRACKSS
VMODE/SYNC
PARAMETER
PGOOD Pull-Down Resistance
Power Good Filter Time
Internal Soft-Start Time
VFB During Tracking
TRACKSS Pull-Up Current
MODE/SYNC Threshold Voltage
IMODE
SYNC Threshold Voltage
MODE/SYNC Input Current
CONDITIONS
10mA Load
10% to 90% Rise Time
TRACKSS = 0.3V
MODE VIH
MODE VIL
SYNC VIH
MODE = 0V
MODE = INTVCC
MIN
TYP MAX UNITS
25
Ω
20
40
µs
1000 1500
µs
0.28
0.3 0.315
V
1.4
µA
1
V
0.4
V
0.95
V
1.5
µA
–1.5
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: The LTC3636 is tested under pulsed load conditions such
that TJ ≈ TA. The LTC3636E is guaranteed to meet specifications from
0°C to 85°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
LTC3636I is guaranteed over the –40°C to 125°C operating junction
temperature range. Note that the maximum ambient temperature
consistent with these specifications is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
impedance and other environmental factors. The junction temperature
(TJ, in °C) is calculated from the ambient temperature (TA, in °C) and
power dissipation (PD, in Watts) according to the formula:
TJ = TA + (PD • θJA), where θJA (in °C/W) is the package thermal
impedance.
Note 3: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 4: Output voltages outside the specified range are not optimized for
controlled on-time operation. Refer to the Applications Information section
for further discussions related to the output voltage range.
Note 5: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 6: Guaranteed by design.
3636fa
4
For more information www.linear.com/LTC3636
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