Datasheet

2
LT1961
1961fa
ABSOLUTE MAXIMUM RATINGS
W
WW
U
Input Voltage .......................................................... 25V
Switch Voltage ......................................................... 35V
SHDN Pin ............................................................... 25V
FB Pin Current ....................................................... 1mA
SYNC Pin Current .................................................. 1mA
Operating Junction Temperature Range (Note 2)
LT1961E, LT1961I ........................... – 40°C to 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
(Note 1)
T
JMAX
= 125°C, θ
JA
= 50°C/W
GROUND PAD CONNECTED
TO LARGE COPPER AREA
1
2
3
4
V
IN
SW
GND
GND
8
7
6
5
SYNC
V
C
FB
SHDN
TOP VIEW
MS8E PACKAGE
8-LEAD PLASTIC MSOP
PI CO FIGURATIO
UUU
PARAMETER CONDITION MIN TYP MAX UNITS
Recommended Operating Voltage ● 325V
Maximum Switch Current Limit ● 1.5 2 3 A
Oscillator Frequency 3.3V < V
IN
< 25V ● 1 1.5 MHz
Switch On Voltage Drop I
SW
= 1.5A ● 310 500 mV
V
IN
Undervoltage Lockout (Note 3) ● 2.47 2.6 2.73 V
V
IN
Supply Current I
SW
= 0A ● 0.9 1.3 mA
V
IN
Supply Current/I
SW
I
SW
= 1.5A 27 mA/A
Shutdown Supply Current V
SHDN
= 0V, V
IN
= 25V, V
SW
= 25V 6 20 μA
● 45 μA
Feedback Voltage 3V < V
IN
< 25V, 0.4V < V
C
< 0.9V 1.182 1.2 1.218 V
● 1.176 1.224 V
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. V
IN
= 15V, V
C
= 0.8V, SHDN, SYNC and switch open unless otherwise noted.
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1961EMS8E#PBF LT1961EMS8E#TRPBF LTQY 8-Lead Plastic MSOP –40°C to 125°C
LT1961IMS8E#PBF LT1961IMS8E#TRPBF LTQY 8-Lead Plastic MSOP –40°C to 125°C
LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1961EMS8E LT1961EMS8E#TR LTQY 8-Lead Plastic MSOP –40°C to 125°C
LT1961IMS8E LT1961IMS8E#TR LTQY 8-Lead Plastic MSOP –40°C to 125°C
ORDER I FOR ATIO
UUW
Consult LTC Marketing for parts specified with wider operating temperature ranges. *Temperature grades are 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/