SYNC Voltage .............................................................6V
Operating Junction Temperature Range (Note 2)
LT8611E ................................................. –40 to 125°C
LT8611I .................................................. –40 to 125°C
Storage Temperature Range ......................–65 to 150°C
24 23 22 21
SYNC 1
TR/SS 2
RT 3
EN/UV 4
V
IN
5
V
IN
6
PGND 7
PGND 8
orDer inForMaTion
LEAD FREE FINISH
LT8611EUDD#PBF
LT8611IUDD#PBF
TAPE AND REEL
LT8611EUDD#TRPBF
LT8611IUDD#TRPBF
PART MARKING*
LGBR
LGBR
PACKAGE DESCRIPTION
24-Lead (3mm
×
5mm) Plastic QFN
24-Lead (3mm
×
5mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°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 non-standard 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/
elecTrical characTerisTics
PARAMETER
Minimum Input Voltage
V
IN
Quiescent Current
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
2.9
1.0
1.0
1.7
1.7
0.46
24
210
MAX
3.4
3
8
4
10
2
50
350
0.973
0.984
0.02
20
3.57
3.35
UNITS
V
µA
µA
µA
µA
mA
µA
µA
V
V
%/V
nA
V
V
8611f
V
EN/UV
= 0V, V
SYNC
= 0V
l
V
EN/UV
= 2V, Not Switching, V
SYNC
= 0V
l
V
EN/UV
= 2V, Not Switching, V
SYNC
= 2V
V
IN
Current in Regulation
Feedback Reference Voltage
Feedback Voltage Line Regulation
Feedback Pin Input Current
INTV
CC
Voltage
V
OUT
= 0.97V, V
IN
= 6V, Output Load = 100µA
V
OUT
= 0.97V, V
IN
= 6V, Output Load = 1mA
V
IN
= 6V, I
LOAD
= 0.5A
V
IN
= 6V, I
LOAD
= 0.5A
V
IN
= 4.0V to 42V, I
LOAD
= 0.5A
V
FB
= 1V
I
LOAD
= 0mA, V
BIAS
= 0V
I
LOAD
= 0mA, V
BIAS
= 3.3V
l
l
l
l
0.967
0.956
–20
3.23
3.25
0.970
0.970
0.004
3.4
3.29
2
LT8611
elecTrical characTerisTics
PARAMETER
INTV
CC
Undervoltage Lockout
BIAS Pin Current Consumption
Minimum On-Time
Minimum Off-Time
Oscillator Frequency
R
T
= 221k, I
LOAD
= 1A
R
T
= 60.4k, I
LOAD
= 1A
R
T
= 18.2k, I
LOAD
= 1A
V
INTVCC
= 3.4V, I
SW
= 1A
V
INTVCC
= 3.4V
V
INTVCC
= 3.4V, I
SW
= 1A
V
INTVCC
= 3.4V
V
IN
= 42V, V
SW
= 0V, 42V
EN/UV Rising
V
EN/UV
= 2V
V
FB
Falling
V
FB
Rising
V
PG
= 3.3V
V
PG
= 0.1V
SYNC Falling
SYNC Rising
V
SYNC
= 2V
l
l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
CONDITIONS
V
BIAS
= 3.3V, I
LOAD
= 1A, 2MHz
I
LOAD
= 1A, SYNC = 0V
I
LOAD
= 1A, SYNC = 3.3V
l
l
MIN
2.5
30
30
50
180
665
1.85
3.5
2.5
–1.5
0.94
–20
6
–6
–40
TYP
2.6
8.5
50
45
80
210
700
2.00
120
4.8
65
3.3
1.0
40
MAX
2.7
70
65
110
240
735
2.15
5.8
4.8
1.5
1.06
20
UNITS
V
mA
ns
ns
ns
kHz
kHz
MHz
mΩ
A
mΩ
A
µA
V
mV
nA
%
%
%
nA
Ω
V
V
nA
µA
Ω
mV
mV
mV
mV
mV
mV
V
V
mV
mV
µA
Top Power NMOS On-Resistance
Top Power NMOS Current Limit
Bottom Power NMOS On-Resistance
Bottom Power NMOS Current Limit
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 Threshold
SYNC Pin Current
TR/SS Source Current
TR/SS Pull-Down Resistance
Current Sense Voltage (V
ISP-ISN
)
9.0
–9.0
1.3
12
–12
40
680
0.8
1.6
–40
1.2
48
46.5
39
38
6
5
0.965
0.900
150
130
–20
2
230
50
50.5
41
42
10
10.5
1.00
0.99
220
205
1.1
2.0
2000
1.4
2.4
40
3.2
52
55.5
45
46
14
16
1.035
1.080
290
280
20
Fault Condition, TR/SS = 0.1V
V
ICTRL
= 1.5V, V
ISN
= 3.3V
V
ICTRL
= 1.5V, V
ISN
= 0V
V
ICTRL
= 800mV, V
ISN
= 3.3V
V
ICTRL
= 800mV, V
ISN
= 0V
V
ICTRL
= 200mV, V
ISN
= 3.3V
V
ICTRL
= 200mV, V
ISN
= 0V
V
ISP-ISN
= 50mV, V
ISN
= 3.3V
V
ISP-ISN
= 50mV, V
ISN
= 0V
V
ISP-ISN
= 10mV, V
ISN
= 3.3V
V
ISP-ISN
= 10mV, V
ISN
= 0V
l
l
l
l
l
l
l
l
l
l
l
IMON Monitor Pin Voltage
ISP, ISN Pin Bias Current
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 LT8611E 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
LT8611I is guaranteed over the full –40°C to 125°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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