SYNC Voltage .............................................................6V
Operating Junction Temperature Range (Note 2)
LT8612E ............................................. –40°C to 125°C
LT8612I .............................................. –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
28 27 26 25
SYNC 1
TR/SS 2
RT 3
EN/UV 4
V
IN
5
V
IN
6
V
IN
7
PGND 8
PGND 9
PGND 10
UDE PACKAGE
28-LEAD (3mm
×
6mm) PLASTIC QFN
θ
JA
= 40°C/W,
θ
JC(PAD)
= 5°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT8612EUDE#PBF
LT8612IUDE#PBF
TAPE AND REEL
LT8612EUDE#TRPBF
LT8612IUDE#TRPBF
http://www.linear.com/product/LT8612#orderinfo
PART MARKING*
LGHW
LGHW
PACKAGE DESCRIPTION
28-Lead (3mm × 6mm) Plastic QFN
28-Lead (3mm × 6mm) 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.
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
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
0.3
24
230
MAX
3.4
5
20
6
20
0.6
60
370
0.976
0.982
0.025
20
UNITS
V
µA
µA
µA
µA
mA
µA
µA
V
V
%/V
nA
8612fa
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
V
OUT
= 0.97V, V
IN
= 6V, Output Load = 100µA
V
OUT
= 0.97V, V
IN
= 6V, Output Load = 1mA
V
IN
= 12V, I
LOAD
= 500mA
V
IN
= 12V, I
LOAD
= 500mA
V
IN
= 4.0V to 25V, I
LOAD
= 0.5A
V
FB
= 1V
l
l
l
l
0.964
0.958
–20
0.970
0.970
0.004
0.5
2
For more information
www.linear.com/LT8612
LT8612
ELECTRICAL CHARACTERISTICS
PARAMETER
INTV
CC
Voltage
INTV
CC
Undervoltage Lockout
BIAS Pin Current Consumption
Minimum On-Time
Minimum Off-Time
Oscillator Frequency
R
T
= 221k, I
LOAD
= 1.5A
R
T
= 60.4k, I
LOAD
= 1.5A
R
T
= 18.2k, I
LOAD
= 1.5A
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
I
LOAD
= 0mA, V
BIAS
= 0V
I
LOAD
= 0mA, V
BIAS
= 3.3V
V
BIAS
= 3.3V, I
LOAD
= 2A, 2MHz
I
LOAD
= 2A, SYNC = 0V
I
LOAD
= 2A, SYNC = 3.3V
l
l
MIN
3.23
3.25
2.4
20
20
50
180
665
1.85
7.5
6
–6
l
TYP
3.4
3.29
2.6
14
40
35
85
210
700
2.00
65
9.7
29
10
0.1
1.0
40
1
9.0
–9.0
1.3
MAX
3.57
3.35
2.8
60
55
120
240
735
2.15
12.0
12
6
1.06
20
11.5
–11.5
40
UNITS
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
= 2V
l
l
l
l
l
0.94
–20
6.5
–6.5
–40
680
0.7
1.0
–40
1.4
2.1
230
1.0
1.3
2000
1.4
1.55
40
3.5
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 LT8612E 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
LT8612I 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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