FB Voltage ...................................................................6V
EN/UVLO Voltage ......................................................55V
BD Voltage ................................................................25V
RT Voltage ..................................................................6V
SS Voltage ...............................................................2.5V
MODE Voltage .............................................................6V
Operating Junction Temperature Range (Note 2)
LT3686E ............................................ –40°C to 125°C
LT3686I ............................................. –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
DD PACKAGE
10-LEAD (3mm
×
3mm) PLASTIC DFN
JA
= 43°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
orDer inForMAtion
LEAD FREE FINISH
LT3686EDD#PBF
LT3686IDD#PBF
TAPE AND REEL
LT3686EDD#TRPBF
LT3686IDD#TRPBF
PART MARKING*
LDYC
LDYC
PACKAGE DESCRIPTION
10-Lead Plastic DFN
10-Lead Plastic DFN
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.
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/
3686fa
LT3686
electricAl chArActeristics
PARAMETER
Quiescent Current at Shutdown
Quiescent Current
Internal Undervoltage Lockout
Overvoltage Lockout
Feedback Voltage
l
l
The
l
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
≥ 1.32V.
CONDITIONS
V
EN/UVLO
< 0.4V
V
EN/UVLO
= 1V
Not Switching, MODE ≤ 0.4V
Not Switching, MODE ≥ 0.8V
37
0.790
0.785
MIN
TYP
0.1
10
1.1
1.2
3.4
38
0.8
0.8
0.0012
20
I
DA
< 1.2A
R
T
= 15.4kΩ
R
T
= 100kΩ
R
T
= 267kΩ
0.3
1.9
2.1
670
300
100
150
I
SW
= 1.2A
(Note 3)
l
MAX
1
15
1.3
1.4
3.6
39
0.810
0.815
100
2.5
2.3
UNITS
µA
µA
mA
mA
V
V
V
V
%/V
nA
MHz
MHz
kHz
kHz
ns
ns
mV
A
A
µA
µA
mA
V
mA
V
A
V
Reference Voltage Line Regulation
FB Pin Bias Current
Switching Frequency
V
IN
= 3.6V
↔
37V
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 Active Load Disable Threshold
DA Pin Current to Stop OSC
MODE High
MODE Low
MODE Pin Bias Current
SS Threshold
SS Source Current
EN/UVLO Bias Current
EN/UVLO Threshold
EN/UVLO Hysteresis
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 LT3686E 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
LT3686I is guaranteed over the full –40°C to 125°C operating junction
temperature range.
V
SS
= 1V
V
EN/UVLO
= 10V
V
EN/UVLO
= 0V
l
l
l
l
l
110
200
2.6
2.65
600
30
2.4
680
1.9
1.85
2.3
2.3
400
20
20
2.2
30
5.2
1.2
0.8
0.4
0.1
0.9
1.3
2
2.7
40
1
1.22
1.8
1.27
2.4
0.85
1.32
3
40
6.5
1.7
SW = 10V (Note 4)
SW = 0V (Note 5)
I
SW
= 1.2A
I
SW
= 1.2A
V
µA
V
µA
µA
µA
V
µA
V
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
2407自己作的板子，烧写flash没问题：ok:flash sectors programmed
但擦除的时候出现问题：
unexpected fatal error encountered which may have been caused by a stack overflow,out of mem ......
FPGA/CPLD
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