lt1941 Linear Technology Corporation, lt1941 Datasheet - Page 2

• Manufacturer Part Number: lt1941
• Description: Triple Monolithic Switching Regulator
• Manufacturer: Linear Technology Corporation

ABSOLUTE AXI U RATI GS
LT1941
(Note 1)
V
BOOST Pin Voltage .................................................. 35V
BOOST Above SW Pin .............................................. 25V
BIAS1, BIAS2 Pins ................................................... 25V
PGOOD, 5GOOD, 12GOOD Pins ............................... 25V
RUN/SS, V
SW1, SW2 Voltage .................................................... V
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
ELECTRICAL CHARACTERISTICS
The
V
PARAMETER
Minimum Operating Voltage
V
BIAS1 Quiescent Current
BIAS2 Quiescent Current
Shutdown Current
Reference Voltage Line Regulation
V
V
V
Switching Frequency
Switching Phase
Foldback Frequency
RUN/SS Current
RUN/SS Threshold
5GOOD Threshold
5GOOD Voltage Output Low
5GOOD Leakage
12GOOD Threshold
2
IN
IN
C
C
C
IN
Source Current
Sink Current
Clamp Voltage
, V
Quiescent Current
Pin ...................................................... (– 0.3V), 25V
●
BIAS1
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
, V
C
BIAS2
, FB, NFB Pins .......................................... 3V
= 5V, V
W
BOOST1
W W
, V
BOOST2
= 8V, unless otherwise noted. (Note 2)
CONDITIONS
Not Switching
Not Switching
Not Switching
V
5V < V
V
V
SW1 to SW2
SW1 to SW3
V
V
I
V
V
5GOOD
RUNSS1,2,3
C
C
FB
IN
5GOOD
IN
= 0.6V
= 0.6V
Rising
Rising
= 0V
U
IN
= 125µA, V
= 2V
< 25V
= 0V
IN
IN
= 4V
PACKAGE/ORDER I FOR ATIO
Consult LTC Marketing for parts specified with wider operating temperature ranges.
RUN/SS1
RUN/SS2
RUN/SS3
PGOOD1
PGOOD2
BOOST1
SW1
SW1
FB1
FB2
V
V
V
V
C1
C2
IN
IN
EXPOSED PAD (PIN 29) IS GND
T
MUST BE SOLDERED TO PCB
JMAX
28-LEAD PLASTIC TSSOP
10
11
12
13
14
1
2
3
4
5
6
7
8
9
= 125°C, θ
FE PACKAGE
TOP VIEW
29
JA
●
●
= 25°C/ W
28
27
26
25
24
23
22
21
20
19
18
17
16
15
MIN
BIAS2
SW3
PGND
V
BOOST2
SW2
V
PGOOD3
FB3
NFB
V
5GOOD
12GOOD
BIAS1
150
–30
0.9
0.4
IN
IN
C3
1
U
0.01
10.8
TYP
100
100
180
200
3.3
1.6
1.7
1.1
0.6
4.5
0.2
50
10
2
5
0
2
ORDER PART
W
LT1941EFE
NUMBER
MAX
1.35
210
400
3.5
3.5
7.5
2.2
0.4
75
30
3
A
= 25°C.
UNITS
U
1941fa
MHz
%/V
Deg
Deg
kHz
mA
mA
mA
µA
µA
µA
µA
nA
V
V
V
V
V
V