LT8697E ................................................. –40°C to 125°C
LT8697I.................................................. –40°C to 125°C
24 23 22 21
SYNC 1
TR/SS 2
RT 3
EN/UV 4
V
IN
5
V
IN
6
PGND 7
PGND 8
UDD PACKAGE
24-LEAD (3mm
×
5mm) PLASTIC QFN
θ
JA
= 46°C/W,
θ
JC
= 5°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LT8697EUDD#PBF
LT8697IUDD#PBF
TAPE AND REEL
LT8697EUDD#TRPBF
LT8697IUDD#TRPBF
PART MARKING*
LGGW
LGGW
PACKAGE DESCRIPTION
24-Lead (3mm
×
5mm) Plastic QFN
24-Lead (3mm
×
5mm) 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/
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Notes 2, 4)
PARAMETER
V
IN
Undervoltage Lockout
V
IN
Shutdown Current
V
IN
Current in Regulation
V
IN
to Disable Forced Continuous Mode
Output Sink Current in Forced Continuous Mode
USB5V Voltage
USB5V Voltage Line Regulation
Regulated Load Voltage Through 0.3Ω
USB5V Clamp Voltage
V
EN/UV
= 0.3V
l
elecTrical characTerisTics
CONDITIONS
l
MIN
TYP
2.9
1
MAX
3.4
3
8
12
31
1.7
5.01
5.04
35
5.075
UNIT
V
µA
µA
mA
V
A
V
V
mV
V
V
V
IN
= 12V, I
LOAD
= 100µA, R
T
= 56.2k
V
IN
Rising
V
USB5V
= 5.5V, L = 6.8µH, R
T
= 56.2k
V
IN
= 12V
l
l
9
27
0.6
4.97
4.91
4.925
29
1
4.99
4.99
6
5
9
l
V
IN
= 6V to 42V
V
IN
= 12V, I
LOAD
= 2.1A, Voltage at Point of Load (End
of Cable), R
CBL
= 13.7k, R
CDC
= 10k, R
SENSE
= 20mΩ
I
USB5V
= 3mA
l
l
8697p
2
For more information
www.linear.com/LT8697
LT8697
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Notes 2, 4)
PARAMETER
USB5V Current
Current Sense Voltage (V
ISP
– V
ISN
)
CONDITIONS
V
ISN
= 5V, V
ISP
– V
ISN
= 40mV, R
CBL
= 13.7k
V
ISN
= 5V, V
ISP
– V
ISN
= 10mV, R
CBL
= 13.7k
V
ISN
= 5V, V
ISP
– V
ISN
= 0V, R
CBL
= 13.7k
R
CBL
= Open
V
CTRL
= 1.5V, V
ISN
= 5V
V
CTRL
= 1.5V, V
ISN
= 0V
V
CTRL
= 800mV, V
ISN
= 5V
V
CTRL
= 800mV, V
ISN
= 0V
V
CTRL
= 200mV, V
ISN
= 5V
V
CTRL
= 200mV, V
ISN
= 0V
V
ISP
– V
ISN
= 40mV, R
CBL
= 13.7k
V
ISP
– V
ISN
= 10mV, R
CBL
= 13.7k
V
ISP
– V
ISN
= 50mV, V
RCBL
= 0V
V
ISP
= V
ISN
= 0V, 5V
V
ICTRL
= 1.5V
V
SYS
= 0V, 5V
2.6
V
IN
= 12V
V
SYS
= 5V, R
T
= 56.2k
V
SYS
= 5V, I
LOAD
= 2.1A
96
I
LOAD
= 1A
I
LOAD
= 0.5A
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
elecTrical characTerisTics
MIN
58
12
0
0
45.5
44.5
37.5
36
6
5
720
130
–2
–20
–0.5
TYP
60
15
2
1
48
48.5
39.5
40
9.5
10
800
205
–3
–2
3.4
2.9
5.8
7.5
4
450
97.5
45
80
7
300
700
2.00
120
4.8
65
4.5
0.1
1.0
40
MAX
62
23
8
2
50
53
42
44.5
13
15
880
280
–4
20
–3
3.15
5.92
5
99
70
110
7.9
340
750
2.05
6
5.8
5
1.06
20
UNIT
µA
µA
µA
µA
mV
mV
mV
mV
mV
mV
mV
mV
mA
µA
µA
V
V
V
V
mA
mV
%
ns
ns
V
kHz
kHz
MHz
mΩ
A
mΩ
A
µA
V
mV
nA
%
%
%
Ω
µs
V
V
nA
µA
Ω
8697p
RCBL Monitor Voltage
RCBL Output Current Limit
ISP, ISN Bias Current
ICTRL Current
INTV
CC
Voltage
INTV
CC
Undervoltage Lockout
SYS Voltage
SYS Voltage to Disable Forced Continuous Mode
SYS Current in Regulation
Dropout Voltage (V
IN
– V
SYS
)
Maximum Duty Cycle in Dropout
Minimum On-Time
Minimum Off-Time
Oscillator Frequency
5.63
3
l
30
50
6.2
250
620
1.9
3.2
3.5
Minimum V
IN
for SYS Regulation at Full Frequency R
T
= 16.5k, V
USB5V
= 0V, I
LOAD
= 0.5A
R
T
= 140k
R
T
= 56.2k
R
T
= 16.5k
I
SW
= 1A
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 Threshold
EN/UV Hysteresis
EN/UV Bias Current
PG Upper Threshold Offset from V
USB5V
PG Lower Threshold Offset from V
USB5V
PG Hysteresis
PG Pull-Down Resistance
PG Transition Delay
SYNC Threshold
SYNC Current
TR/SS Current
TR/SS Pull-Down Resistance
l
V
INTVCC
= 3.4V, I
SW
= 1A
V
INTVCC
= 3.4V
V
IN
= 42V, V
SW
= 0V, 42V
V
EN/UV
Rising
V
EN/UV
= 2V
V
USB5V
Falling
V
USB5V
Rising
V
PG
= 0.1V
V
USB5V
from 5V to 4V
V
SYNC
Falling
V
SYNC
Rising
V
SYNC
= 2V
V
TR/SS
= 0V
Fault Condition, V
TR/SS
= 0.1V
0.8
1.6
–40
–1.2
l
l
l
0.94
–20
6
–6
9
–9
1.3
680
40
1.1
2.0
–2.2
230
12
–12
2000
1.4
2.4
40
–3.2
l
For more information
www.linear.com/LT8697
3
LT8697
elecTrical characTerisTics
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 LT8697E 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
LT8697I is guaranteed over the full –40°C to 125°C operating junction
temperature range. High junction temperatures degrade operating
lifetimes.
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
will reduce lifetime.
Note 4:
Polarity specification for current into a pin is positive and out of
a pin is negative. All voltages are referenced to GND unless otherwise
测试/测量
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