LT3651-8.2/LT3651-8.4
4
36518284fa
For more information www.linear.com/LT3651-8.2
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 LT3651-8.2/LT3651-8.4 are tested under pulse loaded
conditions such that T
J
= T
A
. The LT3651-8.2E/LT3651-8.4E are
guaranteed to meet performance 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 LT3651-8.2I/LT3651-8.4I are
guaranteed over the full –40°C to 125°C operating junction temperature
range. The junction temperature (T
J
in °C) is calculated from the ambient
temperature (T
A
in °C) and power dissipation (P
D
in Watts) according to
the formula:
T
J
= T
A
+ P
D
• θ
JA
where θ
JA
(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. The maximum
rated junction temperature will be exceeded when this protection is active.
Continuous operation above the specified absolute maximum operating
junction temperature may impair device reliability or permanently damage
the device.
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 20V, SHDN = 2V, SENSE = BAT = V
BAT (F LT )
,
C
TIMER
= 0.68µF, R
T
= 50k, CLP = CLN = V
IN
, BOOST – SW = 4V.
PARAMETER CONDITIONS MIN TYP MAX UNITS
TIMER Charge/Discharge Current 25 µA
TIMER Disable Threshold
l
0.1 0.25 V
Full Charge Cycle Time-Out 3 Hour
Precondition Timeout 22.5 Minute
Timer Accuracy
l
–13 13 %
Switcher Operating Frequency, f
O
R
T
= 50kΩ
R
T
= 250kΩ
1.1
250
MHz
kHz
Minimum SW On-Time, t
ON(MIN)
150 ns
