LT1944-1 데이터 시트보기 (PDF) - Linear Technology
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LT1944-1 Datasheet PDF : 8 Pages
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LT1944-1
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
LT1944-1EMS
MS10 PART
MARKING
LTTU
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
Minimum Input Voltage
Quiescent Current, Each Switcher
FB Comparator Trip Point
FB Comparator Hysteresis
FB Voltage Line Regulation
FB Pin Bias Current (Note 3)
Switch Off Time, Switcher 1 (Note 4)
Switch Off Time, Switcher 2 (Note 4)
Switch VCESAT
Switch Current Limit, Switcher 1
Switch Current Limit, Switcher 2
SHDN Pin Current
SHDN Input Voltage High
SHDN Input Voltage Low
Switch Leakage Current
CONDITIONS
Not Switching
VSHDN = 0V
1.2V < VIN < 12V
VFB = 1.23V
VFB > 1V
VFB < 0.6V
VFB > 1V
VFB < 0.6V
ISW = 70mA
VSHDN = 1.2V
VSHDN = 5V
Switch Off, VSW = 5V
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
1.5
µs
1.5
µs
85
120
mV
65
100 125
mA
130 175 225
mA
2
3
µA
8
12
µA
0.9
V
0.25
V
0.01
5
µA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1944-1E 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.
Note 4: See Figure 1 for Switcher 1 and Switcher 2 locations.
2
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