Datasheet
LT3573
2
3573fd
For more information www.linear.com/LT3573
ABSOLUTE MAXIMUM RATINGS
SW ............................................................................60V
V
IN
, SHDN/UVLO, R
FB
, BIAS .....................................40V
SS, V
C
, T
C
, R
REF
, R
ILIM
...............................................5V
Maximum Junction Temperature .......................... 125°C
Operating Junction Temperature Range (Note 2)
LT3573E ............................................ –40°C to 125°C
Storage Temperature Range ..................–65°C to 150°C
ORDER INFORMATION
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, unless otherwise noted.
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3573EMSE#PBF LT3573EMSE#TRPBF 3573 16-Lead Plastic MSOP –40°C to 125°C
LT3573IMSE#PBF LT3573IMSE#TRPBF 3573 16-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.
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
l
3 40 V
Quiescent Current SS = 0V
V
SHDN/UVLO
= 0V
3.5
0
1
mA
µA
Soft-Start Current SS = 0.4V 7 µA
SHDN/UVLO Pin Threshold UVLO Pin Voltage Rising
l
1.15 1.22 1.29 V
SHDN/UVLO Pin Hysteresis Current V
UVLO
= 1V 2 2.5 3 µA
Soft-Start Threshold 0.7 V
Maximum Switching Frequency 1000 kHz
Switch Current Limit R
ILIM
= 10k 1.25 1.55 1.85 A
Minimum Current Limit V
C
= 0V 200 mA
Switch V
CESAT
I
SW
= 0.5A 150 250 mV
R
REF
Voltage V
IN
= 3V
l
1.21
1.20
1.23 1.25
1.25
V
R
REF
Voltage Line Regulation 3V < V
IN
< 40V 0.01 0.03 %/V
R
REF
Pin Bias Current (Note 3)
l
100 600 nA
I
REF
Reference Current Measured at R
FB
Pin with R
REF
= 6.49k 190 µA
PIN CONFIGURATION
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
TOP VIEW
MSE PACKAGE
16-LEAD PLASTIC MSOP
GND
TEST
GND
SW
V
IN
BIAS
SHDN
/UVLO
GND
GND
TC
R
REF
R
FB
V
C
R
ILIM
SS
GND
17
θ
JA
= 50°C/W, θ
JC
= 10°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE CONNECTED TO GND
(Note 1)