LT3697E ............................................ –40°C to 125°C
LT3697I ............................................. –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10sec).................... 300°C
17
GND
MSE PACKAGE
16-LEAD PLASTIC MSOP
θ
JA
= 40°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LT3697EMSE#PBF
LT3697IMSE#PBF
TAPE AND REEL
LT3697EMSE#TRPBF
LT3697IMSE#TRPBF
PART MARKING*
3697
3697
PACKAGE DESCRIPTION
16-Lead Plastic MSOP
16-Lead Plastic MSOP
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
3697f
For more information
www.linear.com/LT3697
LT3697
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
EN
= 12V unless otherwise noted. (Notes 3, 6)
PARAMETER
V
IN
Undervoltage Lockout
V
IN
Overvoltage Lockout
Dropout Comparator Threshold
Dropout Comparator Hysteresis
V
IN
Current
SYS Current
V
SYS
= 5V, V
EN
= 0.3V
V
SYS
= 5V, Not Switching
V
SYS
= 0V, Not Switching
V
EN
= 0.3V
V
SYS
= 5V, Not Switching
V
SYS
= 0V, Not Switching
l
elecTrical characTerisTics
CONDITIONS
l
l
MIN
35.5
550
TYP
4.2
37
650
200
0.01
0.75
1.1
9
300
–75
4.99
1
60
13
0
1000
210
0
300
6.1
6.8
60.5
35.2
20.5
20
–1.1
MAX
4.8
39.5
750
2
1.0
1.4
13
500
–120
5.03
5
62
15
3
1030
240
50
400
6.2
7.1
64.5
105
37.5
23
30
–1.6
–13
240
3
7.8
UNITS
V
V
mV
mV
μA
mA
mA
μA
μA
μA
V
mV
μA
μA
μA
mV
mV
mV
μA
V
V
mV
mV
mV
mV
μA
mA
μA
mA
%
V
mS
V/V
μA
μA
A/V
V
(V
IN
– V
SYS
) Falling, V
IN
= 5V
0.5
0.8
200
4.95
58
11
960
180
200
l
USB5V Voltage
USB5V Line Regulation
USB5V Current
6V < V
IN
< 35V
V
SENSE
= 50mV, R
CBL
= 16.5k
V
SENSE
= 10mV, R
CBL
= 16.5k
V
SENSE
= 0V, R
CBL
= 16.5k
V
SENSE
= 50mV, R
CBL
= 16.5k
V
SENSE
= 10mV, R
CBL
= 16.5k
V
SENSE
= 0V, R
CBL
= 16.5k
V
RCBL
= 0V, V
SENSE
= 50mV
V
USB5V
= 0V
V
USB5V
= 0V
V
ISP
= 5V, R
LIM
= Open
V
ISP
= 0V, R
LIM
= Open
V
ISP
= 5V, R
LIM
= 56.2k
V
ISP
= 5V, R
LIM
= 29.4k
V
ISP
, V
ISN
= 5V
V
ISP
, V
ISN
= 0V
V
RLIM
= 1.2V
V
SYS
= 5V
V
USB5V
Rising
V
SYS
Rising
l
l
l
l
R
CBL
Voltage
R
CBL
Current Limit
SYS Voltage
SYS Voltage to Disable Switching
SENSE Voltage (Note 7)
6.0
6.5
56.5
20
33
18
l
l
l
l
ISP and ISN Bias Current
RLIM Current
Active Load Current from SYS
USB5V Voltage Offset to Enable Active Load
SYS Voltage Threshold to Disable Active Load
Error Amp gm
Error Amp Gain
VC Source Current
VC Sink Current
VC to Switch gm
VC Clamp Voltage
–9
120
0.5
6.6
–11
180
1.5
7.2
400
500
V
VC
= 1.3V
V
VC
= 1.3V
–80
80
5
1.8
For more information
www.linear.com/LT3697
3
3697f
LT3697
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
EN
= 12V unless otherwise noted. (Notes 3, 6)
PARAMETER
Switching Frequency
CONDITIONS
R
T
= 22.1k
R
T
= 63.4k
R
T
= 453k
R
T
= 63.4k, V
SYS
= 0V
I
SW
= 0.9A
I
SW
= 0.9A
l
l
l
l
elecTrical characTerisTics
MIN
1.8
0.9
250
TYP
2
1
300
240
100
140
MAX
2.25
1.12
350
160
210
6.7
1
2.2
65
2.5
UNITS
MHz
MHz
KHZ
kHz
ns
ns
A
mV
µA
V
mA
V
V
μA
%
ms
μA
μA
V
μA
Foldback Frequency
Minimum Switch On-Time
Minimum Switch Off-Time
Switch Current Limit (Note 8)
Switch V
CESAT
SW Leakage Current
Minimum BST Voltage (Note 9)
BST Current
EN Input Voltage High
EN Input Voltage Low
EN Current
SENSE Voltage to Trigger
FLT
FLT
Blanking
FLT
Leakage
FLT
Sink Current
SYNC Threshold
SYNC Current
4.3
5.3
220
0.1
1.6
35
I
SW
= 2A
V
EN
= 0.3V, V
BST
= 5V, V
SW
= 0V
I
SW
= 2A
I
SW
= 2A
l
l
0.3
1
97
0.5
99.5
1.5
0.1
180
0.7
0.1
1
2
100
4
1
V
EN
= 2.5V
Percentage of Nominal Sense Voltage
V
FLT
= 5V
V
FLT
= 0.3V
V
SYNC
= 5V
l
l
100
0.4
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:
Absolute maximum voltage at V
IN
and EN is 60V for nonrepetitive
1 second transients, and 35V for continuous operation.
Note 3:
The LT3697E 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
LT3697I 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 4:
Note that the maximum ambient temperature consistent with
these specifications is determined by specific operating conditions in
conjunction with board layout, the rated package thermal impedance and
other environmental factors.
Note 5:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 150°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 6:
Polarity specification for current into a pin is positive and out of
a pin is negative. All voltages are referenced to GND unless otherwise
specified. MAX and MIN refer to absolute values.
Note 7:
SENSE Voltage is defined as the differential voltage applied across
the sense amplifier inputs, or V
ISP
– V
ISN
. SENSE voltage and V
SENSE
are
synonymous.
Note 8:
Switch current limit is guaranteed by design and/or correlation to
static test. Slope compensation reduces switch current limit at higher duty
cycles.
Note 9:
Boost voltage is the minimum voltage across the boost capacitor
needed to guarantee full saturation of the switch.
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