CSP Voltage ............................................... –0.3V to 42V
CSN Voltage ........................... CSP – 0.3V to CSP + 0.3V
ISP Voltage .............................. ISN – 0.3V to ISN + 0.3V
ISN Voltage ...............................................–0.3V to BIAS
INTV
CC
Voltage ......................................... –0.3V to 5.5V
RT Voltage ................................................ –0.3V to 5.5V
SS Voltage ............................................... –0.3V to 5.5V
Operating Junction Temperature Range
LT8711E ............................................. –40°C to 125°C
LT8711I .............................................. –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
PIN CONFIGURATION
EN/FBIN
TOP VIEW
EN/FBIN
FB
V
C
SS
OPMODE
ISP
ISN
INTV
EE
BIAS
1
2
3
4
5
6
7
8
9
21
GND
20 RT
19 SYNC
18 NC
17 CSP
16 CSN
15 EXTV
CC
14 V
IN
13 INTV
CC
12 NC
11 BG
V
C
1
SS 2
OPMODE 3
ISP 4
ISN 5
INTV
EE
6
7
BIAS
8
TG
9 10
NC
BG
21
GND
TOP VIEW
SYNC
16 CSP
15 CSN
14 EXTV
CC
13 V
IN
12 INTV
CC
11 NC
20 19 18 17
TG 10
FE PACKAGE
20-LEAD PLASTIC TSSOP
T
JMAX
= 125°C,
θ
JA
= 38°C/W,
θ
JC
= 10°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
UDC PACKAGE
20-LEAD (3mm
×
4mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 52°C/W,
θ
JC
= 6.8°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT8711EFE#PBF
LT8711IFE#PBF
LT8711EUDC#PBF
LT8711IUDC#PBF
TAPE AND REEL
LT8711EFE#TRPBF
LT8711IFE#TRPBF
LT8711EUDC#TRPBF
LT8711IUDC#TRPBF
http://www.linear.com/product/LT8711#orderinfo
PART MARKING*
LT8711 FE
LT8711 FE
LGQJ
LGQJ
PACKAGE DESCRIPTION
20-Lead TSSOP
20-Lead TSSOP
20-Lead 3mm × 4mm QFN
20-Lead 3mm × 4mm QFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°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.
RT
FB
2
Rev A
For more information
www.analog.com
LT8711
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
BIAS
= 12V, unless otherwise noted (Note 3).
PARAMETER
V
IN
Operating Voltage Range
Quiescent Current in Normal Operation
(I
VIN
+ I
EXTVCC
+ I
BIAS
)
Quiescent Current in Burst Mode Operation
(I
VIN
+ I
EXTVCC
+ I
BIAS
)
Quiescent Current in Shutdown
(I
VIN
+ I
EXTVCC
+ I
BIAS
)
FB Output Regulation Voltage, V
FB_REG
FB Line Regulation
FB Pin Input Bias Current
Error Amp Transconductance
Error Amp Voltage Gain
Maximum Current Sense Voltage,
V
CSP
– V
CSN
Switching Frequency, f
OSC
Switching Frequency Range
SYNC Input Voltage High
SYNC Input Voltage Low
SYNC Clock Pulse Duty Cycle
Recommended SYNC Ratio f
SYNC
/f
OSC
INTV
CC
Voltage
INTV
CC
Line Regulation
INTV
CC
Load Regulation
INTV
CC
Maximum External Load Current
INTV
CC
Undervoltage Lockout
INTV
CC
Undervoltage Lockout Hysteresis
INTV
EE
Voltage, V
BIAS
– V
INTVEE
INTV
EE
Undervoltage Lockout, V
BIAS
– V
INTVEE
INTV
EE
Undervoltage Lockout Hysteresis,
V
BIAS
– V
INTVEE
BG Rise Time
BG Fall Time
TG Rise Time
TG Fall Time
BG and TG Non-Overlap Time
BG and TG Non-Overlap Time
Minimum On-Time
C
BG
= 3.3nF (Note 4)
C
BG
= 3.3nF (Note 4)
C
TG
= 3.3nF (Note 4)
C
TG
= 3.3nF (Note 4)
TG Rising to BG Rising, C
BG
= C
TG
= 3.3nF (Note 4)
BG Falling to TG Falling, C
BG
= C
TG
= 3.3nF (Note 4)
C
BG
= C
TG
= 3.3nF
I
INTVEE
= 10mA
V
BIAS
– V
INTVEE
Rising
V
BIAS
– V
INTVEE
Falling
l
l
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
V
EXTVCC
= 0V
V
EXTVCC
= 4.5V
V
EN/FBIN
= 2.5V, Not Switching
V
FB
= V
FB_REG
+ 3mV
V
EN/FBIN
= 0V
l
l
l
MIN
4.5
0
TYP
MAX
42
42
UNITS
V
V
mA
µA
µA
mV
mV
%/V
nA
µmhos
dB
2.0
15
1
784
795
–50
800
800
0.01
l
2.5
25
2
816
805
0.05
50
4.5V ≤ V
IN
≤ 42V
V
FB
= 0.8V
∆I = ±5µA
Minimum Duty Cycle
Maximum Duty Cycle
R
T
= 30.3k
R
T
= 247k
Free-Running
Synchronizing
l
l
l
l
l
l
l
l
0
250
90
46
26
675
85
85
140
1.3
50
33
750
100
54
40
825
115
825
750
0.4
mV
mV
kHz
kHz
kHz
kHz
V
V
%
V
%/V
%/V
%
mA
V
V
mV
V
V
V
mV
ns
ns
ns
ns
ns
ns
ns
V
SYNC
= 0V to 2V, f
SYNC
= 500kHz
I
INTVCC
= 10mA
6V ≤ V
IN
≤ 42V, V
EXTVCC
= 0, I
INTVCC
= 10mA
6V ≤ V
EXTVCC
≤ 42V, V
VIN
= 0, I
INTVCC
= 10mA
I
INTVCC
= 0mA to 40mA
Internal Load Current = 40mA
INTV
CC
Rising
INTV
CC
Falling
l
l
l
20
0.8
4.75
5
–0.003
–0.003
–1
10
3.9
3.45
4.85
3.6
3.4
4.1
3.6
500
5.15
3.85
3.6
250
14
12
11
14
70
70
100
80
1.2
5.25
–0.03
–0.03
–2
4.3
3.75
5.4
4.1
3.8
For more information
www.analog.com
3
Rev A
LT8711
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
BIAS
= 12V, unless otherwise noted (Note 3).
PARAMETER
SS Charge Current
SS Low Detection Voltage
EN/FBIN Active Mode
EN/FBIN Chip Enable
EN/FBIN Chip Enable Hysteresis
EN/FBIN Input Voltage Low
EN/FBIN Current Limit Adjustment Voltage
EN/FBIN Pin Input Bias Current
EN/FBIN Amp Transconductance
EN/FBIN Amp Voltage Gain
Shutdown Mode
Full Current Limit
Near Zero Current Limit
V
EN/FBIN
= 12V
V
FB
= 0.6V
V
FB
= 0.6V
l
l
l
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
V
SS
= 0V, Current Flows Out of SS pin
Part Exiting Undervoltage Lockout
EN/FBIN Rising
EN/FBIN Rising
EN/FBIN Falling
l
l
l
l
l
MIN
6
65
1.28
0.97
0.94
TYP
10
85
1.35
1.03
1
30
MAX
15
105
1.42
1.11
1.08
0.2
UNITS
µA
mV
V
V
V
mV
V
V
V
nA
µmhos
V/V
1.12
–50
0
40
100
1.27
50
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:
Do not apply a positive or negative voltage or current source to
BG, TG and INTV
EE
pins, otherwise permanent damage may occur.
Note 3:
The LT8711E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the
–40°C to 125°C operating temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT8711I is guaranteed over the full –40°C to 125°C operating junction
temperature range.
Note 4:
Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 5:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation over the specified maximum operating junction
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