EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
PART NUMBER
LT8609SEV#PBF
LT8609SIV#PBF
PART
MARKING*
LGYN
LGYN
http://www.linear.com/product/LT8609#orderinfo
PAD FINISH
Au (RoHS)
PACKAGE
TYPE**
LQFN (Laminate Package
with QFN Footprint
MSL
RATING
3
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
FINISH CODE
e4
Consult Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
•
Pad or ball finish code is per IPC/JEDEC J-STD-609.
•
Terminal Finish part marking, go to:
http://www.linear.com/leadfree/
•
Recommended PCB Assembly and Manufacturing Procedures:
www.linear.com/umodule/pcbassembly
•
Package and Tray Drawings:
www.linear.com/packaging
•
Parts ending with PBF are RoHS and WEEE compliant.
** The LT8609S package has the same footprint as a standard 3mm × 3mm QFN Package.
2
8609sf
For more information
www.linear.com/LT8609S
LT8609S
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER
Minimum Input Voltage
l
elecTrical characTerisTics
CONDITIONS
MIN
TYP
2.7
1
1.7
46
480
MAX
3.0
3.2
5
12
90
700
0.778
0.794
0.06
±20
75
60
245
760
2.075
5.7
5
UNITS
V
µA
µA
µA
µA
V
V
%/V
nA
ns
ns
ns
kHz
kHz
MHz
mΩ
A
mΩ
µA
V
mV
nA
%
%
%
nA
Ω
V
V
µA
Ω
kHz
V
IN
Quiescent Current
V
IN
Current in Regulation
Feedback Reference Voltage
Feedback Voltage Line Regulation
Feedback Pin Input Current
Minimum On-Time
Minimum Off Time
Oscillator Frequency
V
EN/UV
= 0V, V
SYNC
= 0V
V
EN/UV
= 2V, Not Switching, V
SYNC
= 0V, V
IN
≤ 36V
V
IN
= 6V, V
OUT
= 2.7V, Output Load = 100µA
V
IN
= 6V, V
OUT
= 2.7V, Output Load = 1mA
V
IN
= 6V, I
LOAD
= 100mA
V
IN
= 6V, I
LOAD
= 100mA
V
IN
= 4.0V to 40V
V
FB
= 1V
I
LOAD
= 1.5A, SYNC = 0V
I
LOAD
= 1.5A, SYNC = 1.9V
R
FSET
= 221k, I
LOAD
= 0.5A
R
FSET
= 60.4k, I
LOAD
= 0.5A
R
FSET
= 18.2k, I
LOAD
= 0.5A
I
LOAD
= 1A
l
l
l
l
l
l
l
l
0.770
0.758
0.774
0.774
0.02
45
45
115
l
l
l
155
640
1.925
3.4
200
700
2.00
185
4.75
115
Top Power NMOS On-Resistance
Top Power NMOS Current Limit
Bottom Power NMOS On-Resistance
SW Leakage Current
EN/UV Pin Threshold
EN/UV Pin Hysteresis
EN/UV Pin Current
PG Upper Threshold Offset from V
FB
PG Lower Threshold Offset from V
FB
PG Hysteresis
PG Leakage
PG Pull-Down Resistance
Sync Low Input Voltage
Sync High Input Voltage
TR/SS Source Current
TR/SS Pull-Down Resistance
Spread Spectrum Modulation Frequency
l
V
IN
= 42V, V
SW
= 40V
EN/UV Rising
V
EN/UV
= 2V
V
FB
Rising
V
FB
Falling
V
PG
= 42V
V
PG
= 0.1V
l
l
0.99
1.05
50
1.11
±20
l
l
l
5.0
5.0
8.5
8.5
0.5
13.0
13.0
±200
l
550
0.4
1
0.5
0.9
2.7
2
300
3
l
l
1200
3.2
3
900
6
INTV
CC
= 3.5V
Fault Condition, TR/SS = 0.1V
V
SYNC
= 3.3V
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. Absolute Maximum Ratings are those values beyond
which the life of a device may be impaired.
Note 2:
The LT8609SE 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
LT8609SI is guaranteed over the full –40°C to 125°C operating junction
temperature range.
Note 3:
This IC includes overtemperature protection that is intended to
protect the device during overload conditions. Junction temperature will
exceed 150°C when overtemperature protection is active. Continuous
operation above the specified maximum operating junction temperature
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