Datasheet
LT3685
2
3685fb
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
V
IN
, RUN/SS Voltage (Note 5) ...................................60V
BOOST Pin Voltage ...................................................56V
BOOST Pin Above SW Pin .........................................30V
FB, RT, V
C
Voltage .......................................................5V
PG, BD, SYNC Voltage ..............................................30V
(Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage
●
3 3.6 V
V
IN
Overvoltage Lockout
●
36 38 40 V
Quiescent Current from V
IN
V
RUN/SS
= 0.2V
V
BD
= 3V, Not Switching
V
BD
= 0, Not Switching
●
0.01
450
1.3
0.5
600
1.7
μA
μA
mA
Operating Junction Temperature Range (Note 2)
LT3685E ............................................. –40°C to 125°C
LT3685I .............................................. –40°C to 125°C
Storage Temperature Range ................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
(MSE Only) ....................................................... 300°C
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3685EDD#PBF
LT3685IDD#PBF
LT3685EMSE#PBF
LT3685IMSE#PBF
LT3685EDD#TRPBF
LT3685IDD#TRPBF
LT3685EMSE#TRPBF
LT3685IMSE#TRPBF
LCYG
LCYG
LT C Y F
LT C Y F
10-Lead (3mm × 3mm) Plastic DFN
10-Lead (3mm × 3mm) Plastic DFN
10-Lead Plastic MSOP
10-Lead Plastic MSOP
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
*For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/
TOP VIEW
DD PACKAGE
10-LEAD (3mm s 3mm) PLASTIC DFN
10
9
6
7
8
4
5
3
11
2
1
R
T
V
C
FB
PG
SYNC
BD
BOOST
SW
V
IN
RUN/SS
JA
= 45°C/W,
JC
= 10°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
1
2
3
4
5
BD
BOOST
SW
V
IN
RUN/SS
10
9
8
7
6
R
T
V
C
FB
PG
SYNC
TOP VIEW
MSE PACKAGE
10-LEAD PLASTIC MSOP
11
JA
= 45°C/W,
JC
= 10°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ELECTRICAL CHARACTERISTICS
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 10V, V
RUN/SS
= 10V, V
BOOST
= 15V, V
BD
= 3.3V unless otherwise
noted. (Note 2)