SYNC Voltage .............................................................6V
Operating Junction Temperature Range (Note 2)
LT8609E/LT8609AE/LT8609BE ......... –40°C to 125°C
LT8609I/LT8609AI/LT8609BI ............ –40°C to 125°C
LT8609H/LT8609AH .......................... –40°C to 150°C
LT8609AJ .......................................... –40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
PIN CONFIGURATION
LT8609/LT8609A
TOP VIEW
BST
SW
INTV
CC
RT
SYNC
1
2
3
4
5
11
GND
10
9
8
7
6
EN/UV
V
IN
PG
TR/SS
FB
BST
SW
INTV
CC
RT
NC
1
2
3
4
5
LT8609B
TOP VIEW
11
GND
10
9
8
7
6
EN/UV
V
IN
PG
TR/SS
FB
TOP VIEW
BST
NC
SW
NC
INTV
CC
RT
SYNC
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
EN/UV
NC
V
IN
NC
PG
TR/SS
FB
FB
17
GND
MSE PACKAGE
10-LEAD PLASTIC MSOP
JA
= 40°C/W
EXPOSED PAD (PIN 11) IS GND,
MUST BE SOLDERED TO PCB
MSE PACKAGE
10-LEAD PLASTIC MSOP
JA
= 40°C/W
EXPOSED PAD (PIN 11) IS GND,
MUST BE SOLDERED TO PCB
MS PACKAGE
16-LEAD PLASTIC MSOP
JA
= 40°C/W,
JC
(PAD) = 10°C/W
EXPOSED PAD (PIN 17) IS GND,
MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT8609EMSE#PBF
LT8609IMSE#PBF
LT8609HMSE#PBF
LT8609AEMSE#PBF
LT8609AIMSE#PBF
LT8609BEMSE#PBF
LT8609BIMSE#PBF
LT8609AHMSE#PBF
LT8609AJMSE#PBF
LT8609AHMSE16#PBF
LT8609AJMSE16#PBF
TAPE AND REEL
LT8609EMSE#TRPBF
LT8609IMSE#TRPBF
LT8609HMSE#TRPBF
LT8609AEMSE#TRPBF
LT8609AIMSE#TRPBF
LT8609BEMSE#TRPBF
LT8609BIMSE#TRPBF
LT8609AHMSE#TRPBF
LT8609AJMSE#TRPBF
PART MARKING*
LTGRW
LTGRW
LTGRW
LTGVR
LTGVR
LTGZY
LTGZY
LTGVR
LTGVR
PACKAGE DESCRIPTION
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–40°C to 150°C
–40°C to 150°C
–40°C to 150°C
LT8609AHMSE16#TRPBF 8609A
LT8609AJMSE16#TRPBF 8609A
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications.
Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
Rev. H
2
For more information
www.analog.com
LT8609/LT8609A/LT8609B
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
1
350
MAX
3.0
3.2
4
12
4
UNITS
V
V
IN
Quiescent Current
LT8609/LT8609A:
V
EN/UV
= 0V, V
SYNC
= 0V
V
EN/UV
= 2V, Not Switching, V
SYNC
= 0V
LT8609B:
V
EN/UV
= 0V
V
EN/UV
= 2V, Not Switching
l
µA
µA
µA
µA
µA
µA
V
V
V
V
%/V
nA
ns
ns
ns
kHz
kHz
MHz
MHz
m
A
m
µA
V
mV
V
IN
Current in Regulation
Feedback Reference Voltage
LT8609/LT8609A:
V
IN
= 6V, V
OUT
= 2.7V, Output Load = 100µA
V
IN
= 6V, V
OUT
= 2.7V, Output Load = 1mA
LT8609/LT8609A:
V
IN
= 6V, I
LOAD
= 100mA
V
IN
= 6V, I
LOAD
= 100mA
LT8609B:
V
IN
= 6V, I
LOAD
= 100mA
V
IN
= 6V, I
LOAD
= 100mA
l
l
46
480
0.778
0.770
0.772
0.759
0.782
0.782
0.782
0.782
0.02
45
45
90
90
700
0.786
0.794
0.792
0.805
0.04
±20
75
60
130
245
760
2.075
2.125
5.7
15
l
l
l
l
l
l
Feedback Voltage Line Regulation
Feedback Pin Input Current
Minimum On-Time
Minimum Off Time
Oscillator Frequency
V
IN
= 4.0V to 40V
V
FB
= 1V
I
LOAD
= 1.5A, SYNC = 0V
I
LOAD
= 1.5A, SYNC = 1.9V
LT8609/LT8609A:
R
T
= 221k, I
LOAD
= 0.5A
R
T
= 60.4k, I
LOAD
= 0.5A
R
T
= 18.2k, I
LOAD
= 0.5A
LT8609B:
R
T
= 18.2k, I
LOAD
= 0.5A
l
l
l
l
155
640
1.925
1.875
3.4
200
700
2.00
2.00
185
4.5
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
I
LOAD
= 1A
l
V
IN
= 42V, V
SW
= 40V
EN/UV Rising
LT8609/LT8609A:
V
EN/UV
= 2V
LT8609B:
V
EN/UV
= 2V
l
l
0.99
1.05
50
1.11
l
l
l
l
±20
±30
5.0
4.0
8.5
8.5
13.0
14.0
nA
nA
%
%
PG Upper Threshold Offset from V
FB
LT8609/LT8609A:
V
FB
Rising
LT8609B:
V
FB
Rising
Rev. H
For more information
www.analog.com
3
LT8609/LT8609A/LT8609B
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER
PG Lower Threshold Offset from V
FB
CONDITIONS
LT8609/LT8609A:
V
FB
Falling
LT8609B:
V
FB
Falling
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
Fault Condition, TR/SS = 0.1V
LT8609/LT8609A:
V
SYNC
= 3.3V
1
V
PG
= 42V
V
PG
= 0.1V
LT8609/LT8609A
LT8609/LT8609A:
INTV
CC
= 3.5V
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
5.0
4.0
TYP
8.5
8.5
0.5
MAX
13.0
14.0
±200
UNITS
%
%
%
nA
V
550
0.4
0.9
2.7
1
2
300
3
1200
3.2
3
900
6
kHz
V
µA
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 LT8609E/LT8609AE/LT8609BE 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 LT8609I/LT8609AI/LT8609BI is
guaranteed over the full –40°C to 125°C operating junction temperature
range. The LT8609H/LT8609AH/LT8609AJ 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 temperatures greater than 125°C.
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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