Datasheet

LT3798
2
3798fa
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
EN/UVLO ...................................................................30V
V
IN
............................................................................42V
INTV
CC
...................................................................... 12V
CTRL1, CTRL2, CTRL3
................................................ 4V
FB, V
REF
, COMP
+
........................................................3V
V
C
, OVP, COMP
–
.........................................................4V
SENSE
......................................................................0.4V
V
IN_SENSE
................................................................. 1mA
DCM
.......................................................................±3mA
Operating Temperature Range (Note 2)
LT3798E/LT3798I................................... –40°C to 125°C
Storage Temperature Range
.................. –65°C to 150°C
(Note 1)
1
2
3
4
5
6
7
8
CTRL1
CTRL2
CTRL3
V
REF
OVP
V
C
COMP
+
COMP
–
16
15
14
13
12
11
10
9
V
IN_SENSE
SENSE
GATE
INTV
CC
EN/UVLO
V
IN
DCM
FB
TOP VIEW
17
GND
MSE PACKAGE
16-LEAD PLASTIC MSOP
θ
JA
= 50°C/W, θ
JC
= 10°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3798EMSE#PBF LT3798EMSE#TRPBF 3798 16-Lead Plastic MSOP –40°C to 125°C
LT3798IMSE#PBF LT3798IMSE#TRPBF 3798 16-Lead Plastic MSOP –40°C to 125°C
LT3798HMSE#PBF LT3798HMSE#TRPBF 3798 16-Lead Plastic MSOP –40°C to 150°C
LT3798MPMSE#PBF LT3798MPMSE#TRPBF 3798 16-Lead Plastic MSOP –55°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.
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
Input Voltage Range 10 38 V
V
IN
Quiescent Current V
EN/UVLO
= 0.2V
V
EN/UVLO
= 1.5V, Not Switching
45 60
70
70 µA
µA
V
IN
Quiescent Current, INTV
CC
Overdriven V
INTVCC
= 11V 60 µA
V
IN
Shunt Regulator Voltage I = 1mA 40 V
V
IN
Shunt Regulator Current Limit 8 mA
INTV
CC
Quiescent Current V
EN/UVLO
= 0.2V
V
EN/UVLO
= 1.5V, Not Switching
12.5
1.8
15.5
2.2
17.5
2.7
µA
mA
EN/UVLO Pin Threshold EN/UVLO Pin Voltage Rising
l
1.21 1.25 1.29 V
EN/UVLO Pin Hysteresis Current EN/UVLO=1V 8 10 12 µA
V
IN_SENSE
Threshold Turn Off 27 µA
V
REF
Voltage 0µA Load
200µA Load
l
l
1.97
1.95
2.0
1.98
2.03
2.03
V
V
CTRL1/CTRL2/CTRL3 Pin Bias Current CTLR1/CTRL2/CTRL3 = 1V ±30 nA
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
= 18V, INTV
CC
= 11V, unless otherwise noted.