EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
MSE PACKAGE
12-LEAD PLASTIC MSOP
JA
= 40°C/W,
JC
= 10°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
orDer inForMAtion
LEAD FREE FINISH
LT3686AEDD#PBF
LT3686AIDD#PBF
LT3686AEMSE#PBF
LT3686AIMSE#PBF
LT3686AHMSE#PBF
TAPE AND REEL
LT3686AEDD#TRPBF
LT3686AIDD#TRPBF
LT3686AEMSE#TRPBF
LT3686AIMSE#TRPBF
LT3686AHMSE#TRPBF
PART MARKING*
LFRK
LFRK
3686A
3686A
3686A
PACKAGE DESCRIPTION
10-Lead Plastic DFN
10-Lead Plastic DFN
12-Lead Plastic MSOP
12-Lead Plastic MSOP
12-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
*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/
3686afa
2
LT3686A
electricAl chArActeristics
PARAMETER
Quiescent Current at Shutdown
Quiescent Current
Internal Undervoltage Lockout
Overvoltage Lockout
Feedback Voltage
FB Pin Bias Current
Switching Frequency
Minimum On Time
Minimum Off Time
Switch V
CESAT
Switch Current Limit
Switch Active Current
BOOST Pin Current
Minimum Boost Voltage Above Switch
Max BD Pin Active Load Current
BD Pin Voltage to Disable Active Load
DA Pin Current to Stop OSC
SYNC/MODE High
SYNC/MODE Low
SYNC/MODE Bias Current
SS Threshold
SS Source Current
EN/UVLO Bias Current
EN/UVLO Threshold to Turn Off
EN/UVLO Hysteresis Current
Boost Diode Forward Drop
I
BD
to I
BOOST
= 200mA
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 LT3686AE 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
LT3686AI is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT3686AH is guaranteed over the full –40°C to
150°C operating junction temperature range. High junction temperatures
degrade operating lifetimes; operating lifetime is derated for junction
temperatures greater than 125°C. (Note 6)
V
SS
= 1V
V
EN/UVLO
= 10V
V
EN/UVLO
= 0V
●
●
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 10V, V
EN/UVLO
≥ 1.34V.
CONDITIONS
V
EN/UVLO
< 0.4V
V
EN/UVLO
= 1V
Not Switching, SYNC/MODE ≤ 0.4V
Not Switching, SYNC/MODE ≥ 0.8V
37
0.790
0.785
0.3
1.9
MIN
TYP
0.1
10
1.1
1.2
3.4
38
0.8
0.8
60
I
DA
< 1.2A
R
T
= 15.4kΩ, IDA < 1.2A
SYNC/MODE > 0.8V, BD < 6V
I
SW
= 1.2A
(Note 3)
●
MAX
1
15
1.3
1.4
3.6
39
0.810
0.815
100
2.5
2.3
110
200
2.6
2.65
600
30
2.4
7
UNITS
µA
µA
mA
mA
V
V
V
V
nA
MHz
MHz
ns
ns
mV
A
A
µA
µA
mA
V
mA
V
A
V
V
IN
= 3.6V
↔
37V
●
2.1
100
150
680
1.9
1.85
2.3
2.3
400
20
20
2.2
SW = 10V (Note 4)
SW = 0V (Note 5)
I
SW
= 1.2A
I
SW
= 1.2A
SYNC/MODE > 0.8V, BD < 6V
●
●
●
●
30
6
1.2
0.8
40
6.5
1.7
0.4
0.2
0.9
V
µA
V
µA
µA
µA
V
µA
V
1.3
2
2.7
40
1
1.22
1.8
1.28
2.4
0.85
1.34
3
Note 3:
Current limit guaranteed by design and/or correlation to static test.
Slope compensation reduces current limit at higher duty cycle.
Note 4:
Current flows into pin.
Note 5:
Current flows out of pin.
Note 6:
This IC includes overtemperature protection that is intended to protect
the device during momentary overload conditions. Junction temperature will
exceed the maximum operating junction temperature when overtemperature
protection is active. Continuous operation above the specified maximum
operating junction temperature may impair device reliability. See High
Temperature Considerations section. Also see Operation section.
Note 7:
Absolute Maximum Voltage at V
IN
and EN/UVLO pins is 60V for
nonrepetitive one second transients, and 55V for continuous operation.
