Datasheet

LT8302
3
Rev E
For more information www.analog.com
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 5V, V
EN/UVLO
= V
IN
, C
INTVCC
= 1µF to GND, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNIT
V
IN
V
IN
Voltage Range
l
3 42 V
I
Q
V
IN
Quiescent Current V
EN/UVLO
= 0.2V
V
EN/UVLO
= 1.1V
Sleep Mode (Switch Off)
Active Mode (Switch On)
0.5
53
106
380
2 µA
µA
µA
µA
EN/UVLO Shutdown Threshold For Lowest Off I
Q
l
0.2 0.75 V
EN/UVLO Enable Threshold Falling
l
1.178 1.214 1.250 V
EN/UVLO Enable Hysteresis 14 mV
I
HYS
EN/UVLO Hysteresis Current V
EN/UVLO
= 0.3V
V
EN/UVLO
= 1.1V
V
EN/UVLO
= 1.3V
–0.1
2.3
–0.1
0
2.5
0
0.1
2.7
0.1
µA
µA
µA
V
INTVCC
INTV
CC
Regulation Voltage I
INTVCC
= 0mA to 10mA 2.85 3 3.1 V
I
INTVCC
INTV
CC
Current Limit V
INTVCC
= 2.8V 10 13 20 mA
INTV
CC
UVLO Threshold Falling 2.39 2.47 2.55 V
INTV
CC
UVLO Hysteresis 105 mV
(R
FB
– V
IN
) Voltage I
RFB
= 75µA to 125µA –50 50 mV
R
REF
Regulation Voltage
l
0.98 1.00 1.02 V
R
REF
Regulation Voltage Line Regulation 3V ≤ V
IN
≤ 42V –0.01 0 0.01 %/V
V
TC
TC Pin Voltage 1.00 V
I
TC
TC Pin Current V
TC
= 1.2V
V
TC
= 0.8V
12 15
–200
18 µA
µA
f
MIN
Minimum Switching Frequency 11.3 12 12.7 kHz
t
ON(MIN)
Minimum Switch-On Time 160 ns
t
OFF(MAX)
Maximum Switch-Off Time Backup Timer 170 µs
I
SW(MAX)
Maximum Switch Current Limit 3.6 4.5 5.4 A
I
SW(MIN)
Minimum Switch Current Limit 0.70 0.87 1.04 A
R
DS(ON)
Switch On-Resistance I
SW
= 1.5A 80 mΩ
I
LKG
Switch Leakage Current V
SW
= 65V 0.1 0.5 µA
t
SS
Soft-Start Timer 11 ms
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 SW pin is rated to 65V for transients. Depending on the
leakage inductance voltage spike, operating waveforms of the SW pin
should be derated to keep the flyback voltage spike below 65V as shown
in Figure5.
Note 3: The LT8302E 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
LT8302I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT8302H is guaranteed over the full –40°C to
150°C operating junction temperature range. The LT8302MP is guaranteed
over the full –55°C to 150°C operating junction temperature range. High
junction temperatures degrade operating lifetimes. Operating lifetime is
derated at junction temperature greater than 125°C.
Note 4: The LT8302 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.
Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.