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
LT8714E ............................................. –40°C to 125°C
LT8714I .............................................. –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
FB
V
C
SS
PG
IMON
ISN
ISP
BIAS
INTV
EE
1
2
3
4
5
6
7
8
9
21
GND
20 GND
19 SYNC
18 RT
17 CTRL
16 EN
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
LT8714EFE#PBF
LT8714IFE#PBF
TAPE AND REEL
LT8714EFE#TRPBF
LT8714IFE#TRPBF
PART MARKING*
LT8714FE
LT8714FE
PACKAGE DESCRIPTION
20-Lead Plastic TSSOP Exposed Pad
20-Lead Plastic TSSOP Exposed Pad
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.
2
8714f
For more information
www.linear.com/LT8714
LT8714
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
= 12V, V
BIAS
= 12V, unless otherwise
noted (Note 2).
PARAMETER
Minimum Operating Input Voltage
Quiescent Current, I
VIN
Quiescent Current in Shutdown
EN Chip Enable Thresholds
EN Chip Enable Hysteresis
EN Input Voltage Low
EN Pin Bias Current
Shutdown Mode
V
EN
= 3V
V
EN
= 1.3V
V
EN
= 0V
SS Charge Current
SS Low Detection Voltage
SS Voltage to Enable Switching
SS Hysteresis
Low Dropout Regulators, I
INTVCC
and I
INTVEE
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
I
INTVEE
Dropout Voltage, V
INTVEE
Current Limit Voltage, V
CSP
– V
CSN
V
BIAS
= 6V, I
INTVEE
= 10mA
V
FB
= 1.4V, CTRL = 1.1V, Minimum Duty Cycle
V
FB
= 1.4V, CTRL = 1.1V, Maximum Duty Cycle
V
FB
= 0.1V, CTRL = 1.1V, Minimum Duty Cycle
V
FB
= 0.1V, CTRL = 1.1V, Maximum Duty Cycle
FB Regulation Voltage
CTRL = 1.1V
CTRL = 0.1V
CTRL = 0V
FB Pin Bias Current at FB Regulation. (Note 6)
CTRL = 1.1V
CTRL = 0.1V
CTRL = 0V
l
l
l
l
l
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
l
TYP
4.25
4
0
MAX
4.5
5.5
1
1.38
1.34
0.3
UNITS
V
mA
μA
V
V
mV
V
μA
μA
μA
μA
mV
V
V
mV
Not Switching, V
BIAS
= 7.5V
V
EN
= 0V
EN Rising
EN Falling
l
l
1.22
1.18
1.3
1.26
44
44
12.7
0
60
15.2
0.1
13.8
82
1.21
1.15
V
SS
= 50mV, Current Flowing Out of SS pin
Part Exiting Undervoltage Lockout
SS Rising
SS Falling
l
l
7
18
0.75
0.65
10.1
50
1.0
0.92
80
I
INTVCC
= 10mA
INTV
CC
Rising
INTV
CC
Falling
V
IN
= 6V, I
INTVCC
= 10mA
V
IN
= 12V, I
INTVCC
= 0mA to 80mA
10V ≤ V
IN
≤ 80V, 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
–0.44
–0.005
6.4
4.12
3.95
V
V
V
mV
mV
–2
–0.03
5
6.33
3.6
3.48
%
%/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)
60.5
40
–23
–38
1.092
0.092
0
66.4
–67.7
–77.6
66
47
–32
–51
1.102
0.102
0.0167
68.3
–69.7
–81.6
71.5
56
–41
–65
1.112
0.112
0.033
70.2
–71.7
–85
mV
mV
mV
mV
V
V
V
µA
µA
µA
For more information
www.linear.com/LT8714
3
8714f
LT8714
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
= 12V, V
BIAS
= 12V, unless otherwise
noted (Note 2).
PARAMETER
FB Internal Voltage, V1
FB Internal Resistance, R1
FB Amp Transconductance, EA1
FB Amp Voltage Gain, EA1
FB Line Regulation
Output Current Sense Regulation Voltage,
V
ISP
– V
ISN
IMON Regulation Voltage, EA2
Output Current Sense Amp Transconductance, A7
Output Current Sense Amp Voltage Gain, A7
Output Current Sense Amp Input Dynamic
Range, A7
IMON Amp Transconductance, EA2
IMON Amp Voltage Gain, EA2
Valley Inductor Current Limit, V
ISP
– V
ISN
Oscillator
Switching Frequency, f
OSC
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
Gate Drivers, BG and TG
BG Rise Time
BG Fall Time
TG Rise Time
TG Fall Time
BG and TG Non-Overlap Time
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)
BG Minimum On-Time
BG Minimum Off-Time
TG Minimum On-Time
TG Minimum Off-Time
C
BG
= C
TG
= 3300pF
C
BG
= C
TG
= 3300pF
C
BG
= C
TG
= 3300pF
C
BG
= C
TG
= 3300pF
80
45
150
100
0
290
24
21
15
16
140
90
220
150
420
480
150
770
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
V
SYNC
= 0V to 3V
R
T
= 46.4k
R
T
= 357k
Free-Running or Synchronizing
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
I
FB
= 0.0μA
∆I
VC
= 2μA
MIN
l
l
TYP
0.6065
7.25
200
108
MAX
0.616
7.4
UNITS
V
kΩ
μmhos
V/V
0.597
7.1
4.5V ≤ V
IN
≤ 80V
V
ISN
= 80V, V
FB
= 1.4V, CTRL = 1.1V
V
ISN
= 5V, V
FB
= 1.4V, CTRL = 1.1V
V
FB
= 1V
∆I
IMON
= 10μA
Negative Input Range
Positive Input Range
∆I
VC
=2μA, V
FB
= 1.4V, CTRL=1.1V
V
ISN
= 12V, V
FB
= 1.4V, CTRL = 1.1V
V
ISN
= 80V
V
ISN
= 12V
l
l
l
l
l
l
–0.02
46
46
1.184
–0.001
50
50
1.208
1000
12.14
0.02
54
54
1.233
%/V
mV
mV
V
μmhos
V/V
–55.5
500
–49.5
160
70
–43.5
mV
mV
μmhos
V/V
–220
–220
640
85
100
1.5
–300
–300
750
100
–380
–380
860
115
750
0.4
mV
mV
kHz
kHz
kHz
V
V
%
20
3/4
80
4
8714f
For more information
www.linear.com/LT8714
LT8714
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
= 12V, V
BIAS
= 12V, unless otherwise
noted (Note 2).
PARAMETER
Power Good Indicator, PG
PG Overvoltage Threshold, V
FB
– CTRL
PG Undervoltage Threshold, V
FB
– CTRL
PG Power Good Hysteresis for Overvoltage or
Undervoltage
PG Output Voltage Low
PG Leakage Current
100µA into PG Pin, V
FB
= 1.4V, CTRL = 1.1V
V
PG
= 7V, V
FB
= 1.1V, CTRL = 1.1V
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
l
l
l
l
TYP
114
60
–60
–114
54
9
0.01
MAX
155
100
–20
–75
UNITS
mV
mV
mV
mV
mV
V
FB
Rising, 0.1V ≤ CTRL ≤ 1.1V
V
FB
Falling, 0.1V ≤ CTRL ≤ 1.1V
V
FB
Rising, 0.1V ≤ CTRL ≤ 1.1V
V
FB
Falling, 0.1V ≤ CTRL ≤ 1.1V
75
20
–100
–155
50
1
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 LT8714E 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
LT8714I 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
BG, TG, and INTV
EE
pins, otherwise permanent damage may occur.
Note 6:
Negative FB current is defined as current flowing out of the FB pin.
Positive FB current is defined as current flowing into the FB pin.
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