SYNC Voltage .............................................................6V
Operating Junction Temperature Range (Note 2)
LT8620E ................................................ –40 to 125°C
LT8620I ................................................. –40 to 125°C
Storage Temperature Range ......................–65 to 150°C
PIN CONFIGURATION
TOP VIEW
NC
NC
NC
24 23 22 21
TOP VIEW
SYNC
TR/SS
RT
EN/UV
V
IN
V
IN
NC
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
FB
PG
BIAS
INTV
CC
BST
SW
SW
SW
SYNC 1
TR/SS 2
RT 3
EN/UV 4
V
IN
5
V
IN
6
NC 7
GND 8
9 10 11 12
GND
NC
NC
NC
25
GND
20 FB
19 PG
18 BIAS
17 INTV
CC
16 BST
15 SW
14 SW
13 SW
NC
17
GND
MSE PACKAGE
16-LEAD PLASTIC MSOP
θ
JA
= 40°C/W,
θ
JC(PAD)
= 10°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
UDD PACKAGE
24-LEAD (3mm
×
5mm) PLASTIC QFN
θ
JA
= 46°C/W,
θ
JC(PAD)
= 5°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT8620EMSE#PBF
LT8620IMSE#PBF
LT8620EUDD#PBF
LT8620IUDD#PBF
TAPE AND REEL
LT8620EMSE#TRPBF
LT8620IMSE#TRPBF
LT8620EUDD#TRPBF
LT8620IUDD#TRPBF
PART MARKING*
8620
8620
LGGV
LGGV
PACKAGE DESCRIPTION
16-Lead Plastic MSOP
16-Lead Plastic MSOP
24-Lead (3mm
×
5mm) Plastic QFN
24-Lead (3mm
×
5mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–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/
8620f
2
LT8620
ELECTRICAL CHARACTERISTICS
PARAMETER
Minimum Input Voltage
V
IN
Quiescent Current
CONDITIONS
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
MIN
TYP
2.9
1.0
1.0
1.7
1.7
0.28
20
200
0.970
0.970
0.004
3.4
3.29
2.6
7.2
30
30
90
210
700
2.00
175
3.8
85
3.6
1.0
40
9.0
–9.0
1.3
680
1.0
1.3
1.9
220
MAX
3.4
3
8
4
10
0.5
50
350
0.976
0.982
0.02
20
3.57
3.35
2.7
45
45
130
240
735
2.15
4.6
4.3
1.5
1.06
20
12
–12
40
2000
1.2
1.5
40
2.6
UNITS
V
µA
µA
µA
µA
mA
µA
µA
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
V
EN/UV
= 0V, V
SYNC
= 0V
l
V
EN/UV
= 2V, Not Switching, V
SYNC
= 0V
l
V
IN
Current in Regulation
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
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
EN/UV
= 2V, Not Switching, V
SYNC
= 2V
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
V
BIAS
= 3.3V, I
LOAD
= 1A, 2MHz
I
LOAD
= 1A, SYNC = 0V
I
LOAD
= 1A, SYNC = 3.3V
R
T
= 221k, I
LOAD
= 1A
R
T
= 60.4k, I
LOAD
= 1A
R
T
= 18.2k, I
LOAD
= 1A
I
SW
= 1A
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
Fault Condition, TR/SS = 0.1V
l
l
l
l
0.964
0.958
–20
3.23
3.25
2.5
l
l
l
l
l
180
665
1.85
2.8
2.9
–1.5
0.94
–20
6
–6
–40
l
l
l
l
l
l
0.8
1.1
–40
1.2
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 LT8620E 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
LT8620I 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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