Datasheet

LT1941
2
1941fb
The l denotes the specifi cations which apply over the full operating temperature
range, otherwise specifi cations are at T
A
= 25°C. V
IN
, V
BIAS1
, V
BIAS2
= 5V, V
BOOST1
, V
BOOST2
= 8V, unless otherwise noted. (Note 2)
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
V
IN
Pin ........................................................(–0.3V), 25V
BOOST Pin Voltage ...................................................35V
BOOST Above SW Pin ...............................................25V
BIAS1, BIAS2 Pins ....................................................25V
PGOOD, 5GOOD, 12GOOD Pins .................................25V
RUN/SS, V
C
, FB, NFB Pins ..........................................3V
SW1, SW2 Voltage .....................................................V
IN
SW3 Voltage .............................................................40V
Maximum Junction Temperature (Note 6) ............ 125°C
Operating Ambient Temperature Range
(Note 2) ....................................................–40°C to 85°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
9
10
11
12
13
14
TOP VIEW
FE PACKAGE
28-LEAD PLASTIC TSSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
IN
V
IN
SW1
SW1
BOOST1
PGOOD1
V
C1
FB1
PGOOD2
V
C2
FB2
RUN/SS1
RUN/SS2
RUN/SS3
BIAS2
SW3
PGND
V
IN
BOOST2
SW2
V
IN
PGOOD3
FB3
NFB
V
C3
5GOOD
12GOOD
BIAS1
29
T
JMAX
= 125°C, θ
JA
= 25°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1941EFE#PBF LT1941EFE#TRPBF LT1941EFE 28-LEAD PLASTIC TSSOP –40°C to 85°C
LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LT1941EFE LT1941EFE#TR LT1941EFE 28-LEAD PLASTIC TSSOP –40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to:
http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Operating Voltage
l
3.3 3.5 V
V
IN
Quiescent Current Not Switching 2 3.5 mA
BIAS1 Quiescent Current Not Switching 5 7.5 mA
BIAS2 Quiescent Current Not Switching 1.6 2.2 mA
Shutdown Current V
RUNSS1,2,3
= 0V 50 75 μA
Reference Voltage Line Regulation 5V < V
IN
< 25V 0.01 %/V
V
C
Source Current V
C
= 0.6V 100 μA
V
C
Sink Current V
C
= 0.6V 100 μA
V
C
Clamp Voltage 1.7 V
Switching Frequency
l
0.9 1.1 1.35 MHz