LT8315E, LT8315I .............................. −40°C to 125°C
LT8315H ............................................ −40°C to 150°C
Storage Temperature Range .................. −65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300 °C
21
GND
FE PACKAGE
20(16)-LEAD PLASTIC TSSOP
θ
JA
= 38°C/W,
θ
JC
= 10°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT8315EFE#PBF
LT8315IFE#PBF
LT8315HFE#PBF
TAPE AND REEL
LT8315EFE#TRPBF
LT8315IFE#TRPBF
LT8315HFE#TRPBF
http://www.linear.com/product/LT8315#orderinfo
PART MARKING*
LT8315FE
LT8315FE
LT8315FE
PACKAGE DESCRIPTION
20-Lead Plastic TSSOP
20-Lead Plastic TSSOP
20-Lead Plastic TSSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
8315fa
2
For more information
www.linear.com/LT8315
LT8315
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. BIAS = 40V, V
EN/UVLO
= 40V unless otherwise noted.
SYMBOL
BIAS
I
Q
I
SHDN
V
DRAIN(MIN)
I
STARTUP
V
UVLO
PARAMETER
Chip Bias Voltage Supply Range
BIAS Quiescent Current
DRAIN Shutdown Current
Minimum Drain Voltage for Startup
Startup Current through Depletion FET
EN/UVLO Threshold
EN/UVLO Hysteresis
INTV
CC
UVLO Rising Threshold
INTV
CC
UVLO Falling Threshold
V
REG
G
M
V
TC
I
TC
I
IREG/SS
I
DCM
R
SW
I
SW(MAX)
V
SOURCE(MIN)
V
SOURCE(MAX)
V
SOURCE(ILIM)
F
SW(MIN)
F
SW(MAX)
FB Regulation Voltage
Voltage Error Amplifier Transconductance
TC Voltage
TC Voltage Temperature Coefficient
TC Sinking/Sourcing Current
IREG/SS Current
Flyback Collapse Detection Threshold
Resonant Valley Detection Threshold
Power MOSFET Resistance
Maximum Switch Current
l
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
After Startup
Burst Mode Operation
Active
V
EN/UVLO
< 0.3V, BIAS = Floating
BIAS = Floating
V
DRAIN
= 18V, BIAS = Floating
V
EN/UVLO
Falling
V
EN/UVLO
Rising
Startup Current through Depletion FET
l
l
l
MIN
9.5
TYP
70
470
8
MAX
40
150
700
15
18
UNITS
V
μA
μA
V
μA
V
mV
V
V
V
μS
V
mV/°C
μA
μA
μA
μA
Ω
mA
mA
130
1.18
30
11.1
7.7
1.19
75
1.16
±100
300
1.22
65
12
8.2
1.22
100
1.22
+4.1
10
−170
−85
7
800
20
100
120
3.5
220
140
25
110
130
4
250
142
1.26
120
13.1
8.7
1.25
125
1.28
V
FB
= 1.22V ± 20mV
T
A
= 25°C
l
Current Out-of-Pin
l
9.9
9.5
–140
–65
500
300
15
90
10.1
10.5
–200
–105
10
I
DCM
Rising
I
DCM
Falling
Minimum Current Voltage Threshold
Maximum Current Voltage Threshold
Over-Current Voltage Threshold
Minimum Switching Frequency
Maximum Switching Frequency
250ns Blanking Period; Restarts Chip
Burst Mode
Standby Mode
mV
mV
mV
kHz
Hz
kHz
110
3
187
138
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 LT8315E 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
LT8315I is guaranteed over the full −40°C to 125°C operating junction
temperature range. The LT8315H 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
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