lt3845a Linear Technology Corporation, lt3845a Datasheet - Page 2

• Manufacturer Part Number: lt3845a
• Description: Lt3845a - High Voltage Synchronous Current Mode Step-down Controller With Adjustable Operating Frequency
• Manufacturer: Linear Technology Corporation

ABSOLUTE MAXIMUM RATINGS
LT3845A
(Note 1)
Input Supply Voltage (V
Boosted Supply Voltage (BOOST) .............................80V
Switch Voltage (SW) (Note 8) ....................... 65V to –2V
Differential Boost Voltage
Bias Supply Voltage (V
SENSE
Differential Sense Voltage
BURST_EN Voltage ...................................................24V
SYNC, V
SHDN Pin Currents ..................................................1mA
Operating Junction Temperature Range (Note 2)
Storage Temperature.............................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................... 300°C
ORDER INFORMATION
LEAD FREE FINISH
LT3845AEFE#PBF
LT3845AIFE#PBF
LT3845AMPFE#PBF
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:
For more information on tape and reel specifications, go to:
2
(BOOST to SW) .....................................................24V
(SENSE
LT3845AE (Note 3) ............................ –40°C to 125°C
LT3845AI .......................................... –40°C to 125°C
LT3845AMP ....................................... –55°C to 125°C
+
and SENSE
C
, V
+
to SENSE
FB
, C
SS
, and SHDN Voltages ....................5V
–
Voltages ..................................40V
–
TAPE AND REEL
LT3845AEFE#TRPBF
LT3845AIFE#TRPBF
LT3845AMPFE#TRPBF
) ....................................1V to –1V
CC
IN
) .........................................24V
) ........................................65V
http://www.linear.com/leadfree/
PART MARKING*
3845AFE
3845AFE
3845AFE
http://www.linear.com/tapeandreel/
PIN CONFIGURATION
PACKAGE DESCRIPTION
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
16-Lead Plastic TSSOP
EXPOSED PAD (PIN 17) IS SGND, MUST BE SOLDERED TO PCB
BURST_EN
T
JMAX
SHDN
SYNC
f
C
V
SET
V
V
SS
FB
IN
= 125°C, q
C
16-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
FE PACKAGE
JA
TOP VIEW
= 40°C/W, q
17
JC
16
15
14
13
12
11
10
9
= 10°C/W
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–55°C to 125°C
BOOST
TG
SW
V
BG
PGND
SENSE
SENSE
CC
+
–
3845afa