Datasheet
LT3991/LT3991-3.3/LT3991-5
2
3991fa
absoluTe MaxiMuM raTings
V
IN
, EN Voltage .........................................................55V
BOOST Pin Voltage ...................................................75V
BOOST Pin Above SW Pin ......................................... 30V
FB, V
OUT
, RT, SYNC, SS Voltage .................................6V
PG, BD Voltage .........................................................30V
Boost Diode Current ....................................................1A
(Note 1)
LT3991 LT3991 LT3991-3.3, LT3991-5
TOP VIEW
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
10
11
GND
9
6
7
8
4
5
3
2
1
SYNC
PG
RT
SS
FB
BD
BOOST
SW
V
IN
EN
θ
JA
= 45°C, θ
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
EN
10
9
8
7
6
11
GND
SYNC
PG
RT
SS
FB
TOP VIEW
MSE PACKAGE
10-LEAD PLASTIC MSOP
θ
JA
= 45°C, θ
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
EN
10
9
8
7
6
11
GND
SYNC
PG
RT
SS
V
OUT
TOP VIEW
MSE PACKAGE
10-LEAD PLASTIC MSOP
θ
JA
= 45°C, θ
JC
= 10°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
pin conFiguraTion
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3991EDD#PBF LT3991EDD#TRPBF LFJR
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LT3991IDD#PBF LT3991IDD#TRPBF LFJR
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LT3991EMSE#PBF LT3991EMSE#TRPBF LTFJS 10-Lead Plastic MSOP –40°C to 125°C
LT3991IMSE#PBF LT3991IMSE#TRPBF LTFJS 10-Lead Plastic MSOP –40°C to 125°C
LT3991EMSE-3.3#PBF LT3991EMSE-3.3#TRPBF LTFRS 10-Lead Plastic MSOP –40°C to 125°C
LT3991IMSE-3.3#PBF LT3991IMSE-3.3#TRPBF LTFRS 10-Lead Plastic MSOP –40°C to 125°C
LT3991EMSE-5#PBF LT3991EMSE-5#TRPBF LTFRV 10-Lead Plastic MSOP –40°C to 125°C
LT3991IMSE-5#PBF LT3991IMSE-5#TRPBF LTFRV 10-Lead Plastic MSOP –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/
Operating Junction Temperature Range (Note 2)
LT3991E
............................................. –40°C to 125°C
LT3991I
.............................................. –40°C to 125°C
Storage Temperature Range
.............. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
(MSE Only)
.......................................................300°C