Datasheet
LT3975
2
3975f
ABSOLUTE MAXIMUM RATINGS
V
IN
, EN Voltage (Note 3) ...........................................42V
BOOST Pin Voltage
...................................................55V
BOOST Pin Above SW Pin
......................................... 30V
FB, RT, SYNC, SS Voltage
...........................................6V
PG Voltage
................................................................30V
OUT Voltage
.............................................................. 16V
Operating Junction Temperature Range (Note 2)
LT3975E ............................................. –40°C to 125°C
LT3975I.............................................. –40°C to 125°C
LT3975H ............................................ –40°C to 150°C
Storage Temperature Range
.................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
...................300°C
(Note 1)
1
2
3
4
5
6
7
8
FB
SS
OUT
BOOST
SW
SW
SW
NC
16
15
14
13
12
11
10
9
SYNC
PG
RT
EN
V
IN
V
IN
V
IN
NC
TOP VIEW
17
GND
MSE PACKAGE
16-LEAD PLASTIC MSOP
θ
JA
= 40°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
PIN CONFIGURATION
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2)
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3975EMSE#PBF LT3975EMSE#TRPBF 3975 16-Lead Plastic MSOP –40°C to 125°C
LT3975IMSE#PBF LT3975IMSE#TRPBF 3975 16-Lead Plastic MSOP –40°C to 125°C
LT3975HMSE#PBF LT3975HMSE#TRPBF 3975 16-Lead Plastic MSOP –40°C to 150°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/
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage (Note 3)
l
4 4.3 V
Dropout Comparator Threshold (V
IN
– OUT) Falling 430 500 570 mV
Dropout Comparator Threshold Hysteresis 25 mV
Quiescent Current from V
IN
V
EN
Low
V
EN
High, V
SYNC
Low
V
EN
High, V
SYNC
Low
l
0.7
1.6
1.3
2.7
30
µA
µA
µA
FB Pin Current V
FB
= 1.5V
l
0.1 12 nA
Feedback Voltage
l
1.183
1.173
1.197
1.197
1.212
1.222
V
V
FB Voltage Line Regulation 4.3V < V
IN
< 40V (Note 3) 0.0003 0.01 %/V
Switching Frequency R
T
= 11.8k
R
T
= 41.2k
R
T
= 294k
1.8
0.8
160
2.25
1
200
2.7
1.2
240
MHz
MHz
kHz
Minimum Switch On-Time 105 ns
Minimum Switch Off-Time (Note 4) 150 200 ns
ELECTRICAL CHARACTERISTICS