Datasheet
LT3845
2
3845fd
ORDER INFORMATION
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (V
IN
) ........................................65V
Boosted Supply Voltage (BOOST) .............................80V
Switch Voltage (SW) (Note 8) ....................... 65V to –2V
Differential Boost Voltage
(BOOST to SW) .....................................................24V
Bias Supply Voltage (V
CC
) .........................................24V
SENSE
+
and SENSE
–
Voltages ..................................40V
Differential Sense Voltage
(SENSE
+
to SENSE
–
) ................................... 1V to –1V
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3845EFE#PBF LT3845EFE#TRPBF 3845FE 16-Lead Plastic TSSOP –40°C to 125°C
LT3845IFE#PBF LT3845IFE#TRPBF 3845FE 16-Lead Plastic TSSOP –40°C to 125°C
LT3845MPFE#PBF LT3845MPFE#TRPBF 3845FE 16-Lead Plastic TSSOP –55°C to 125°C
LT3845EN#PBF LT3845EN#TRPBF 3845N 16-Lead PDIP –40°C to 125°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
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/
FE PACKAGE
16-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
V
IN
SHDN
C
SS
BURST_EN
V
FB
V
C
SYNC
f
SET
BOOST
TG
SW
V
CC
BG
PGND
SENSE
+
SENSE
–
17
T
JMAX
= 125°C, θ
JA
= 40°C/W, θ
JC
= 10°C/W
EXPOSED PAD (PIN 17) IS SGND, MUST BE SOLDERED TO PCB
N PACKAGE
16-LEAD PDIP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
V
FB
V
C
f
SET
SGND
SENSE
–
SENSE
+
PGND
BG
BURST_EN
C
SS
SHDN
V
IN
BOOST
TG
SW
V
CC
T
JMAX
= 125°C, θ
JA
= 70°C/W, θ
JC
= 34°C/W
PIN CONFIGURATION
BURST_EN Voltage ...................................................24V
SYNC, V
C
, V
FB
, C
SS
, and SHDN Voltages ....................5V
SHDN Pin Currents ..................................................1mA
Operating Junction Temperature Range (Note 2)
LT3845E (Note 3) ............................... –40°C to 125°C
LT3845I .............................................. –40°C to 125°C
LT3845MP.......................................... –55°C to 125°C
Storage Temperature .............................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C