CSP Voltage ................................................. –0.3V to 2V
CSN Voltage ................................................. –0.3V to 2V
ISP Voltage ................................. ISN – 0.4V to ISN + 2V
ISN Voltage ................................................ –0.3V to 80V
IMON Voltage ............................................ –0.3V to 2.5V
Operating Junction Temperature Range
LT8710E ............................................. –40°C to 125°C
LT8710I .............................................. –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
pin conFiguraTion
TOP VIEW
FBX
V
C
SS
FLAG
IMON
ISN
ISP
BIAS
INTV
EE
1
2
3
4
5
6
7
8
9
21
GND
20 GND
19 SYNC
18 RT
17 MODE
16 EN/FBIN
15 CSP
14 CSN
13 V
IN
12 INTV
CC
11 BG
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
orDer inForMaTion
LEAD FREE FINISH
LT8710EFE#PBF
LT8710IFE#PBF
TAPE AND REEL
LT8710EFE#TRPBF
LT8710IFE#TRPBF
PART MARKING*
LT8710FE
LT8710FE
PACKAGE DESCRIPTION
20-Lead Plastic TSSOP
20-Lead Plastic TSSOP
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/
2
8710f
For more information
www.linear.com/LT8710
LT8710
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications for each channel are at T
A
= 25°C. V
IN
= 12V, V
EN/FBIN
= 12V, V
BIAS
= 12V, unless
otherwise noted (Note 2).
PARAMETER
Minimum Operating Input Voltage
Quiescent Current, I
VIN
Quiescent Current in Shutdown
EN/FBIN Active Mode
EN/FBIN Chip Enable
EN/FBIN Chip Enable Hysteresis
EN/FBIN Input Voltage Low
EN/FBIN Pin Bias Current
Shutdown Mode
V
EN/FBIN
= 3V
V
EN/FBIN
= 1.7V
V
EN/FBIN
= 1.6V
V
EN/FBIN
= 0V
V
SS
= 0V, Current Flows Out of SS Pin
Part Exiting Undervoltage Lockout
SS Rising
SS Falling
l
l
l
elecTrical characTerisTics
CONDITIONS
V
IN
OR V
BIAS
V
IN
if V
BIAS
≥ 4.5V
MIN
l
TYP
4.25
4
5.5
0
MAX
4.5
5.5
7.5
1
1.76
1.38
1.34
0.3
UNITS
V
V
mA
mA
µA
V
V
V
mV
V
µA
µA
µA
µA
µA
mV
V
V
mV
0
V
BIAS
= V
ISN
= 7.5V, Not Switching
V
BIAS
= 6.3V, V
INTVEE
= V
ISN
= 0V, Not Switching
V
EN/FBIN
= 0V
EN/FBIN Rising
EN/FBIN Rising
EN/FBIN Falling
l
l
l
1.64
1.22
1.18
1.7
1.3
1.26
44
44
19.5
17.5
0
10.1
50
1.8
1.7
100
14
13
7
18
1.5
1.3
60
25
22.5
0.1
13.8
82
2.1
2.05
SS Charge Current
SS Low Detection Voltage
SS Hi Detection Voltage
SS Hi Detection Hysteresis
Low Dropout Regulators, INTV
CC
and INTV
EE
INTV
CC
Voltage
INTV
CC
Undervoltage Lockout
INTV
CC
Undervoltage Lockout Hysteresis
INTV
CC
Dropout Voltage
INTV
CC
Load Regulation
INTV
CC
Line Regulation
INTV
CC
Maximum External Load Current
INTV
EE
Voltage, V
BIAS
– V
INTVEE
INTV
EE
Undervoltage Lockout,
V
BIAS
– V
INTVEE
INTV
EE
Undervoltage Lockout
Hysteresis, V
BIAS
– V
INTVEE
INTV
EE
Dropout Voltage, V
INTVEE
Current Limit Voltage, V
CSP
– V
CSN
V
BIAS
= 6V, I
INTVEE
= 10mA
V
FBX
= 1.1V, Minimum Duty Cycle
V
FBX
= 1.1V, Maximum Duty Cycle
V
FBX
= 1.4V, MODE = 0V, Minimum Duty Cycle
V
FBX
= 1.4V, MODE = 0V, Maximum Duty Cycle
FBX Positive Output Regulation Voltage,
EA1
FBX Negative Output Regulation Voltage,
EA2
l
l
l
l
l
l
I
INTVCC
= 10mA
INTV
CC
Rising
INTV
CC
Falling
V
IN
– INTV
CC
, V
IN
= 6V, V
BIAS
= 0V, I
INTVCC
= 10mA
V
BIAS
– V
INTVCC
, V
IN
= 0V, V
BIAS
= 6V, I
INTVCC
= 10mA
V
IN
= 12V, V
BIAS
= 0V, I
INTVCC
= 0mA to 80mA
V
IN
= 0V, V
BIAS
= 12V, I
INTVCC
= 0mA to 40mA
10V ≤ V
IN
≤ 80V, V
BIAS
= 0V, I
INTVCC
= 10mA
10V ≤ V
BIAS
≤ 80V, V
IN
= 0V, I
INTVCC
= 10mA
I
INTVEE
= 10mA
V
BIAS
– V
INTVEE
Rising
V
BIAS
– V
INTVEE
Falling
l
l
l
6.2
3.88
3.5
6.3
4
3.73
270
255
280
–0.44
–0.34
–0.003
–0.006
6.4
4.12
3.95
V
V
V
mV
mV
mV
–2
–2
–0.03
–0.03
5
6.33
3.6
3.48
%
%
%/V
%/V
mA
V
V
V
mV
V
l
l
l
6.03
3.24
2.94
6.18
3.42
3.22
200
0.75
Control Loops (Refer to Block Diagram to Locate Amplifiers)
46
23
–23
–38
1.191
–2
50
31
–32
–51
1.213
9.6
54
38
–41
–65
1.237
21
mV
mV
mV
mV
V
mV
For more information
www.linear.com/LT8710
3
8710f
LT8710
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications for each channel are at T
A
= 25°C. V
IN
= 12V, V
EN/FBIN
= 12V, V
BIAS
= 12V, unless
otherwise noted (Note 2).
PARAMETER
Positive FBX Pin Bias Current
Negative FBX Pin Bias Current
FBX Amp Transconductance,
EA1 or EA2
FBX Amp Voltage Gain, EA1 or EA2
FBX Line Regulation
Output Current Sense Regulation
Voltage, V
ISP
– V
ISN
IMON Regulation Voltage, EA3
Output Current Sense Amp
Transconductance, A6
Output Current Sense Amp Voltage
Gain, A6
Output Current Sense Amp Input
Dynamic Range, A6
IMON Amp Transconductance, EA3
IMON Amp Voltage Gain, EA3
EN/FBIN Input Regulation Voltage, EA4
EN/FBIN Amp Transconductance, EA4
EN/FBIN Amp Voltage Gain, EA4
MODE Forced CCM Threshold
MODE Forced CCM Threshold
Hysteresis
DCM Comparator Threshold in
Pulse-Skipping Mode, MODE = 2V
DCM Comparator Threshold in
Forced CCM, MODE =0V
Oscillator
Switching Frequency, f
OSC
Switching Frequency in Foldback
Switching Frequency Range
SYNC High Level for Sync
SYNC Low Level for Sync
SYNC Clock Pulse Duty Cycle
Recommended Min SYNC Ratio
f
SYNC
/f
OSC
V
SYNC
= 0V to 3V
R
T
= 46.4k
R
T
= 357k
Compared to Normal f
OSC
Free-Running or Synchronizing
l
l
l
l
l
elecTrical characTerisTics
CONDITIONS
MIN
l
l
TYP
83.7
83.1
200
70
MAX
85.6
85.2
UNITS
µA
µA
µmhos
V/V
V
FBX
= Positive FBX Reg Voltage, Current into Pin
V
FBX
= Negative FBX Reg Voltage, Current Out of Pin
ΔI = 2μA
81.9
81.1
4.5V ≤ V
IN
≤ 80V, V
BIAS
= 0V
V
ISN
= 80V, V
FBX
= 1V
V
ISN
= 12V, V
FBX
= 1V
V
ISN
= 0V, V
FBX
= 1V
V
ISN
= 12V, V
FBX
= 1V, INTV
EE
in UVLO and V
SS
> 1.8V
V
FBX
= 1V
V
FBX
= 1V, INTV
EE
in UVLO and V
SS
> 1.8V
ΔI = 10μA
l
l
l
l
l
l
–0.02
43
43
40
17
1.184
0.885
–0.001
50
50
50
25
1.213
0.916
1000
11.9
0.02
57
57
60
34
1.24
0.947
%/V
mV
mV
mV
mV
V
V
µmhos
V/V
mV
mV
µmhos
V/V
Negative Input Range, V
ISP
– V
ISN
Positive Input Range, V
ISP
– V
ISN
ΔI = 2μA, V
FBX
= 1V
V
FBX
= 1V
V
FBX
= 1V
ΔI = 2µA, V
FBX
= 1V
V
FBX
= 1V
To Exit Forced CCM Mode, MODE Rising
To Enter Forced CCM Mode, MODE Falling
l
l
l
500
–51.8
165
65
1.55
1.607
140
55
1.662
V
µmhos
V/V
1.19
1.125
1.224
1.175
49
1.258
1.23
V
V
mV
V
ISN
= 80V, To Enter DCM Mode, V
ISP
– V
ISN
Falling
V
ISN
= 12V, To Enter DCM Mode, V
ISP
– V
ISN
Falling
V
ISN
= 0V, To Enter DCM Mode, V
ISP
– V
ISN
Falling
V
ISN
= 80V, To Enter DCM Mode, V
ISP
– V
ISN
Falling
V
ISN
= 12V, To Enter DCM Mode, V
ISP
– V
ISN
Falling
V
ISN
= 0V, To Enter DCM Mode, V
ISP
– V
ISN
Falling
l
l
l
l
l
l
–4.5
–4.5
–7.5
–220
–220
–220
640
85
100
1.5
2.8
2.8
2.8
–300
–300
–300
750
100
1/5
10
10
13
–380
–380
–380
860
115
750
0.4
mV
mV
mV
mV
mV
mV
kHz
kHz
ratio
kHz
V
V
%
20
3/4
80
4
8710f
For more information
www.linear.com/LT8710
LT8710
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications for each channel are at T
A
= 25°C. V
IN
= 12V, V
EN/FBIN
= 12V, V
BIAS
= 12V, unless
otherwise noted (Note 2).
PARAMETER
Gate Drivers, BG and TG
BG Rise Time
BG Fall Time
TG Rise Time
TG Fall Time
BG and TG Non-Overlap Time
BG Minimum On-Time
BG Minimum Off-Time
TG Minimum On-Time
TG Minimum Off-Time
C/10 and Power Good Indicators, FLAG
FLAG C/10 Indicator Threshold
FLAG C/10 Indicator Hysteresis
FLAG Power Good Threshold for
Positive FBX Voltage
FLAG Power Good Threshold for
Negative FBX Voltage
FLAG Power Good Hysteresis for
Positive or Negative FBX Voltage
FLAG Anti-Glitch
FLAG Output Voltage Low
FLAG Leakage Current
Delay from C/10 or Power Good
Threshold Trip to FLAG Toggle
100µA into FLAG Pin
V
FLAG
= 7V, FLAG Off
l
elecTrical characTerisTics
CONDITIONS
MIN
TYP
24
21
15
16
MAX
UNITS
ns
ns
ns
ns
C
BG
= 3300pF (Note 3)
C
BG
= 3300pF (Note 3)
C
TG
= 3300pF (Note 3)
C
TG
= 3300pF (Note 3)
TG Rising to BG Rising, C
BG
= C
TG
= 3300pF (Note 3)
BG Falling to TG Falling, C
BG
= C
TG
= 3300pF (Note 3)
C
BG
= C
TG
= 3300pF
C
BG
= C
TG
= 3300pF
C
BG
= C
TG
= 3300pF
C
BG
= C
TG
= 3300pF
V
ISP
– V
ISN
Falling, V
FBX
= 1.215V
V
ISP
– V
ISN
Rising, V
FBX
= 1.215V
V
FBX
Rising, V
ISP
– V
ISN
= 0V
V
FBX
Falling, V
ISP
– V
ISN
= 0V
V
FBX
Falling, V
ISP
– V
ISN
= 0V
V
FBX
Rising, V
ISP
– V
ISN
= 0V
l
l
80
45
150
100
0
290
1
4
1.127
1.062
46
103
140
90
220
150
420
480
150
770
ns
ns
ns
ns
ns
ns
mV
mV
mV
V
V
mV
mV
mV
5
10
5
1.153
1.095
68.5
126
58
16
23
1.184
1.126
90
152
l
l
l
l
100
9
0.01
50
1
µs
mV
µA
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 LT8710E 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
LT8710I is guaranteed over the full –40°C to 125°C operating junction
temperature range.
Note 3:
Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 4:
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
temperature may impair device reliability.
Note 5:
Do not apply a positive or negative voltage or current source to the
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