SYNC Voltage .............................................................6V
Operating Junction Temperature Range (Note 2)
LT8608E ........................................... –40°C to 125°C
LT8608I ............................................. –40°C to 125°C
LT8608H ............................................ –40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
PIN CONFIGURATION
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 1
SW 2
INTV
CC
3
RT 4
9
GND
TOP VIEW
8 EN/UV
7 V
IN
6 PG
5 FB
MSE PACKAGE
10-LEAD PLASTIC MSOP
θ
JA
= 40°C/W,
θ
JC
= 10°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
DC PACKAGE
8-LEAD (2mm
×
2mm) PLASTIC DFN
ORDER INFORMATION
LEAD FREE FINISH
LT8608EMSE#PBF
LT8608IMSE#PBF
LT8608HMSE#PBF
LT8608EDC#PBF
LT8608IDC#PBF
LT8608HDC#PBF
LT8608BEDC#PBF
LT8608BIDC#PBF
LT8608BHDC#PBF
TAPE AND REEL
LT8608EMSE#TRPBF
LT8608IMSE#TRPBF
LT8608HMSE#TRPBF
LT8608EDC#TRPBF
LT8608IDC#TRPBF
LT8608HDC#TRPBF
LT8608BEDC#TRPBF
LT8608BIDC#TRPBF
LT8608BHDC#TRPBF
http://www.linear.com/product/LT8608#orderinfo
PART MARKING*
LTGVZ
LTGVZ
LTGVZ
LGXB
LGXB
LGXB
LGXC
LGXC
LGXC
PACKAGE DESCRIPTION
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
8-Lead (2mm
×
2mm) Plastic DFN
8-Lead (2mm
×
2mm) Plastic DFN
8-Lead (2mm
×
2mm) Plastic DFN
8-Lead (2mm
×
2mm) Plastic DFN
8-Lead (2mm
×
2mm) Plastic DFN
8-Lead (2mm
×
2mm) Plastic DFN
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 150°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
Consult ADI Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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.
ELECTRICAL CHARACTERISTICS
PARAMETER
Minimum Input Voltage
CONDITIONS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
MIN
l
TYP
2.5
MAX
3.0
3.2
4
12
90
700
UNITS
V
µA
µA
µA
µA
Rev C
V
IN
Quiescent Current
V
IN
Current in Regulation
V
EN/UV
= 0V, V
SYNC
= 0V
V
EN/UV
= 2V, Not Switching, V
SYNC
= 0V or LT8608 DFN, V
IN
≤ 36V
V
IN
= 6V, V
OUT
= 2.7V, Output Load = 100µA
V
IN
= 6V, V
OUT
= 2.7V, Output Load = 1mA
l
l
l
1
1.7
56
500
2
For more information
www.analog.com
LT8608/LT8608B
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER
Feedback Reference Voltage
CONDITIONS
MSOP Package
V
IN
= 6V, I
LOAD
= 100mA
V
IN
= 6V, I
LOAD
= 100mA
DFN Package
V
IN
= 6V, I
LOAD
= 100mA
V
IN
= 6V, I
LOAD
= 100mA
Feedback Voltage Line Regulation
Feedback Pin Input Current
Minimum On-Time
Minimum Off Time
Oscillator Frequency
MSOP Package
R
T
= 221k, I
LOAD
= 500mA
R
T
= 60.4k, I
LOAD
= 500mA
R
T
= 18.2k, I
LOAD
= 200mA
DFN Package
R
T
= 221k, I
LOAD
= 500mA
R
T
= 60.4k, I
LOAD
= 500mA
R
T
= 18.2k, I
LOAD
= 200mA
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
V
PG
= 42V
V
PG
= 0.1V
MSOP Only
INTV
CC
= 3.5V, MSOP Only
MSOP Only
Fault Condition, TR/SS = 0.1V, MSOP Only
V
SYNC
= 3.3V, MSOP Only
l
l
l
l
l
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
0.774
0.762
0.773
0.753
TYP
0.778
0.778
0.778
0.778
±0.02
35
35
93
MAX
0.782
0.798
0.783
0.803
±0.06
±20
65
60
130
245
760
2.10
270
790
2.15
3.9
15
UNITS
V
V
V
V
%/V
nA
ns
ns
ns
kHz
kHz
MHz
kHz
kHz
MHz
mΩ
A
mΩ
µA
V
mV
nA
%
%
%
nA
Ω
V
V
µA
Ω
kHz
l
l
l
l
l
l
V
IN
= 4.0V to 40V
V
FB
= 1V
I
LOAD
= 1A, SYNC = 0V or LT8608 DFN
I
LOAD
= 1A, SYNC = 1.9V or LT8608B DFN
155
640
1.90
130
610
1.85
2.1
200
700
2.00
200
700
2.00
350
2.9
230
I
LOAD
= 0.5A
l
V
IN =
36V
EN/UV Rising
V
EN/UV
= 2V
V
FB
Rising
V
FB
Falling
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
550
0.4
1
0.5
0.9
2.7
2
300
3
1200
3.2
3
900
6
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 LT8608E 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
LT8608I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT8608H 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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