lt3641 Linear Technology Corporation, lt3641 Datasheet - Page 2

• Manufacturer Part Number: lt3641
• Description: Dual Monolithic Buck Regulator With Power-on Reset And Watchdog Timer
• Manufacturer: Linear Technology Corporation

ABSOLUTE MAXIMUM RATINGS
LT3641
V
WDE Voltage .............................................................30V
BST Above SW, SW1 Voltage ....................... –0.3V to 6V
SW1 Above SW Voltage ............................... –0.3V to 6V
V
WDO, RST1, RST2, Voltages ....................... –0.3V to 6V
SS1, SS2, FB1, FB2, RT, CWDT,
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH
LT3641EFE#PBF
LT3641IFE#PBF
LT3641EUFD#PBF
LT3641IUFD#PBF
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:
For more information on tape and reel specifi cations, go to:
2
IN
IN2
, EN/UVLO Voltage (Note 7) .................................55V
, SYNC, EN2, PGOOD2, WDI,
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
EN/UVLO
PGOOD2
CWDT
CPOR
SYNC
RST2
RST1
WDO
WDE
WDI
SS1
FB2
FB1
RT
θ
TAPE AND REEL
LT3641EFE#TRPBF
LT3641IFE#TRPBF
LT3641EUFD#TRPBF
LT3641IUFD#TRPBF
JA
28-LEAD PLASTIC TSSOP
10
11
12
13
14
= 30°C/W, θ
1
2
3
4
5
6
7
8
9
FE PACKAGE
TOP VIEW
GND
29
JC
= 8°C/W
28
27
26
25
24
23
22
21
20
19
18
17
16
15
SS2
EN2
GND
SW2
V
GND
V
BST
SW
SW1
DA
NC
GND
GND
IN2
IN
http://www.linear.com/leadfree/
PART MARKING*
LT3641FE
LT3641FE
3641
3641
http://www.linear.com/tapeandreel/
(Note 1)
CPOR Voltages………... ........................... –0.3V to 2.5V
SW2 Voltage ................................ –0.3V to (V
Operating Junction Temperature Range (Note 2)
LT3641E ................................................. –40°C to 125°C
LT3641I .................................................. –40°C to 125°C
Storage Temperature Range ................... –65°C to 150°C
Lead Temperature, FE Only (Soldering, 10 sec) .... 300°C
PACKAGE DESCRIPTION
28-Lead Plastic TSSOP
28-Lead Plastic TSSOP
28-Lead (4mm × 5mm) Plastic QFN
28-Lead (4mm × 5mm) Plastic QFN
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
CWDT
SYNC
RST2
RST1
WDO
SS1
FB1
28-LEAD (4mm × 5mm) PLASTIC QFN
RT
1
2
3
4
5
6
7
8
θ
JA
28 27 26 25 24
9 10
= 43°C/W, θ
UFD PACKAGE
TOP VIEW
11 12 13
GND
29
JC
= 3.4°C/W
14
23
22
21
20
19
18
17
16
15
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
SW2
V
GND
V
BST
SW
SW1
DA
IN2
IN
IN2
+ 0.3V)
3641f