Datasheet
LT3971A/LT3971A-5
2
3971af
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
(Note 1)
ORDER INFORMATION
V
IN
, EN Voltage .........................................................38V
BOOST Pin Voltage ...................................................55V
BOOST Pin Above SW Pin .........................................30V
FB, RT, SYNC, SS Voltage ...........................................6V
PG, BD Voltage .........................................................30V
V
OUT
Pin Current ....................................................–2mA
Operating Junction Temperature Range (Note 2)
LT3971AI/LT3971AI-5 ........................ –40°C to 125°C
Storage Temperature Range .............. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
(MSE Only) .......................................................300°C
LT3971A LT3971A-5
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
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3971AIMSE#PBF LT3971AIMSE#TRPBF LTGFQ 10-Lead Plastic MSOP –40°C to 125°C
LT3971AIMSE-5#PBF LT3971AIMSE-5#TRPBF LTGFR 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/
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
EN
= 12V, V
BD
= 3.3V unless otherwise noted. (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage (Note 4)
l
4 4.3 V
Quiescent Current from V
IN
V
EN
Low
V
EN
High, V
SYNC
Low
V
EN
High, V
SYNC
Low
l
0.7
1.7
1.2
2.7
4.5
A
A
A
LT3971A FB Pin Current V
FB
= 1.19V
l
0.1 12 nA
Internal Feedback Resistor Divider (LT3971A-5) 10 M