Datasheet

LT1947
2
1947fa
V
IN
Voltage ................................................................ 8V
C
T
Voltage.................................................................. 6V
SW1, SW2 Voltage .................................................. 36V
V
ON
, V
O2
Voltage ..................................................... 30V
ORDER PART
NUMBER
MSE PART MARKING
LTBQW
LT1947EMSE
(Note 1)
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Order Options Tape and Reel: Add #TR, Lead Free: Add #PBF, Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
FB1, FB2 .................................................................... 3V
SHDN......................................................................... 8V
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Lead Temperature (Soldering, 10 sec).................. 300°C
1
2
3
4
5
FB1
FB2
C
T
SW1
GND
10
9
8
7
6
V
ON
V
O2
SHDN
SW2
V
IN
TOP VIEW
MS PACKAGE
10-LEAD PLASTIC MSOP
ORDER PART
NUMBER
MS PART MARKING
LTUE
LT1947EMS
T
JMAX
= 125°C, θ
JA
= 120°C/W
T
JMAX
= 125°C, θ
JA
= 40°C/W
1
2
3
4
5
FB1
FB2
C
T
SW1
GND
10
9
8
7
6
V
ON
V
02
SHDN
SW2
V
IN
TOP VIEW
11
MSE PACKAGE
10-LEAD PLASTIC MSOP
EXPOSED PAD (PIN 11) IS GND
MUST BE SOLDERED TO PCB
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.3V, V
SHDN
= 3.3V unless otherwise specified.
ELECTRICAL CHARACTERISTICS
SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Voltage Range 2.7 8 V
Supply Current SHDN = 2.4V 9.5 12.5 mA
SHDN = 0V 1 µA
FB1 Voltage 1.240 1.26 1.280 V
● 1.225 1.295 V
FB2 Voltage 1.225 1.26 1.295 V
● 1.210 1.310 V
Reference Line Regulation V
IN
= 2.7V to 8V 0.01 0.05 %/V