LT1944 Ver la hoja de datos (PDF) - Linear Technology
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LT1944 Datasheet PDF : 8 Pages
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LT1944
ABSOLUTE AXI U RATI GS
(Note 1)
VIN, SHDN1, SHDN2 Voltage ................................... 15V
SW1, SW2 Voltage .................................................. 36V
FB1, FB2 Voltage .......................................................VIN
Current into FB1, FB2 Pins ..................................... 1mA
Junction Temperature ........................................... 125°C
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
FB1 1
SHDN1 2
GND 3
SHDN2 4
FB2 5
TOP VIEW
10 SW1
9 PGND
8 VIN
7 PGND
6 SW2
MS10 PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 160°C/W
ORDER PART
NUMBER
LT1944EMS
MS10 PART
MARKING
LTTR
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 1.2V, VSHDN = 1.2V unless otherwise noted.
PARAMETER
CONDITIONS
Minimum Input Voltage
Quiescent Current, Each Switcher
FB Comparator Trip Point
Not Switching
VSHDN = 0V
FB Comparator Hysteresis
FB Voltage Line Regulation
FB Pin Bias Current (Note 3)
Switch Off Time
Switch VCESAT
Switch Current Limit
1.2V < VIN < 12V
VFB = 1.23V
VFB > 1V
VFB < 0.6V
ISW = 300mA
SHDN Pin Current
SHDN Input Voltage High
VSHDN = 1.2V
VSHDN = 5V
SHDN Input Voltage Low
Switch Leakage Current
Switch Off, VSW = 5V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1944 is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the – 40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Bias current flows into the FB pin.
MIN TYP MAX UNITS
1.2
V
20
30
µA
1
µA
q 1.205 1.23 1.255
V
8
mV
0.05
0.1
%/V
q
30
80
nA
400
ns
1.5
µs
250 350
mV
250 350 400
mA
2
3
µA
8
12
µA
0.9
V
0.25
V
0.01
5
µA
2
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