SYNC Voltage .............................................................6V
Operating Junction Temperature Range (Note 2)
LT8614E ............................................. –40°C to 125°C
LT8614I .............................................. –40°C to 125°C
LT8614H ............................................ –40°C to 150°C
LT8614MP ......................................... –55°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
20 19 18
BIAS 1
INTV
CC
2
BST 3
V
IN1
4
GND1 6
UDC PACKAGE
18-LEAD (3mm
×
4mm) PLASTIC QFN
θ
JA
= 40°C/W,
θ
JC(PAD)
= 12°C/W (Note 3)
EXPOSED PAD (PINS 21, 22) ARE SW, SHOULD BE SOLDERED TO PCB
NOTE: PINS 5, 12 ARE REMOVED. CONFIGURATION DOES NOT MATCH
JEDEC 20-PIN PACKAGE OUTLINE
orDer inForMaTion
LEAD FREE FINISH
LT8614EUDC#PBF
LT8614IUDC#PBF
LT8614HUDC#PBF
LT8614MPUDC#PBF
TAPE AND REEL
LT8614EUDC#TRPBF
LT8614IUDC#TRPBF
LT8614HUDC#TRPBF
LT8614MPUDC#TRPBF
http://www.linear.com/product/LT8614#orderinfo
PART MARKING*
LGGQ
LGGQ
LGGQ
LGGQ
PACKAGE DESCRIPTION
18-Lead (3mm
×
4mm) Plastic QFN
18-Lead (3mm
×
4mm) Plastic QFN
18-Lead (3mm
×
4mm) Plastic QFN
18-Lead (3mm
×
4mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–55°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.
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.
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
V
IN
Quiescent Current
V
EN/UV
= 0V
l
elecTrical characTerisTics
CONDITIONS
MIN
l
PG
FB
TYP
2.9
1.0
1.0
1.7
1.7
0.26
21
210
MAX
3.4
3
8
4
10
0.5
50
350
UNITS
V
µA
µA
µA
µA
mA
µA
µA
8614fd
V
EN/UV
= 2V, Not Switching, V
SYNC
= 0V
l
V
EN/UV
= 2V, Not Switching, V
SYNC
= 2V
V
IN
Current in Regulation
V
OUT
= 0.97V, V
IN
= 6V, Output Load = 100µA
V
OUT
= 0.97V, V
IN
= 6V, Output Load = 1mA
l
l
2
For more information
www.linear.com/LT8614
LT8614
elecTrical characTerisTics
PARAMETER
Feedback Reference Voltage
Feedback Voltage Line Regulation
Feedback Pin Input Current
INTV
CC
Voltage
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
I
SW
= 1A
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
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
V
BIAS
= 3.3V, I
LOAD
= 1A, 2MHz
I
LOAD
= 1.5A, SYNC = 0V
I
LOAD
= 1.5A, SYNC = 3.3V
l
l
l
l
MIN
0.964
0.958
–20
3.23
3.25
2.5
15
15
180
665
1.85
5.7
4.5
–1.5
l
TYP
0.970
0.970
0.004
3.4
3.29
2.6
9
30
30
80
210
700
2.00
85
8.5
40
6.9
1.0
40
MAX
0.976
0.982
0.02
20
3.57
3.35
2.7
45
45
110
240
735
2.15
10
8.5
1.5
1.06
20
UNITS
V
V
%/V
nA
V
V
V
mA
ns
ns
ns
kHz
kHz
MHz
mΩ
A
mΩ
A
µA
V
mV
nA
%
%
%
nA
Ω
V
V
nA
µA
Ω
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
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
= 6V
l
l
l
l
l
0.94
–20
6
–6
–40
9.0
–9.0
1.2
12
–12
40
650
0.8
1.6
–40
1.5
2.2
200
1.1
2.0
2000
1.4
2.4
40
2.9
Fault Condition, TR/SS = 0.1V
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 LT8614E 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
LT8614I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT8614H is guaranteed to meet performance
specifications from –40°C to 150°C operating junction temperature range.
High junction temperatures degrade operating lifetimes. The LT8614MP
is 100% tested and guaranteed over the full –55°C to 150°C operating
junction temperature range. Operating lifetime is derated at junction
temperatures greater than 125°C.
Note 3:
θ
values determined per JEDEC 51-7, 51-12. See the Applications
Information section for information on improving the thermal resistance.
Note 4:
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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