LTC3643
4
3643fb
For more information www.linear.com/LTC3643
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 LTC3643 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC3643E is guaranteed to meet specified performance from
0°C to 85°C. Specifications over the
–40°C to 125°C operating junction
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
J
= 25°C. V
IN
= 5V, V
RUN
= 2V unless otherwise noted. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
GATE Turn-on Time To CLP-GATE > 2.5V, C
GATE
= 1nF 70 100 µs
GATE Turn-off Time To CLP-GATE < 1V, C
GATE
= 1nF 3 6 µs
GATE Pull-Down Current
l
45 70 95 µA
CAPGD Threshold FBCAP Rising
Hysteresis
550 570
15
590 mV
mV
CAPGD Resistance 170 250 Ω
/PFO Resistance 170 250 Ω
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3643I is guaranteed over
the
full –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.
T
J
is calculated from the ambient T
A
and power dissipation P
D
according
to the following formula: T
J
= T
A
+ (P
D
• θ
JA
)
