LT1945 データシートの表示（PDF） - Linear Technology
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LT1945 Datasheet PDF : 8 Pages
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LT1945
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN, SHDN1, SHDN2 Voltage.....................................15V
SW1, SW2 Voltage....................................................36V
NFB1 Voltage ............................................................–3V
FB2 Voltage............................................................... VIN
Current into NFB1 Pin ............................................–1mA
Current into FB2 Pin................................................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
PIN CONFIGURATION
NFB1 1
SHDN1 2
GND 3
SHDN2 4
FB2 5
TOP VIEW
10 SW1
9 PGND
8 VIN
7 PGND
6 SW2
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 160°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT1945EMS#PBF
LT1945EMS#TRPBF
LTTS
10-Lead Plastic MSOP
–40°C to 85°C
LT1945IMS#PBF
LT1945IMS#TRPBF
LTTS
10-Lead Plastic MSOP
–40°C to 125°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT1945EMS
LT1945EMS#TR
LTTS
10-Lead Plastic MSOP
–40°C to 85°C
LT1945IMS
LT1945IMS#TR
LTTS
10-Lead Plastic MSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS The l 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
MIN TYP MAX UNITS
Minimum Input Voltage
1.2
V
Quiescent Current, (per Converter)
NFB1 Comparator Trip Point
FB2 Comparator Trip Point
FB Comparator Hysteresis
Not Switching
VSHDN = 0V
–40°C < TJ < 85°C
–40°C < TJ < 125°C
–40°C < TJ < 85°C
–40°C < TJ < 125°C
20
30
μA
1
μA
–1.205 –1.23 –1.255
V
–1.195
1.255
V
1.205 1.23 1.255
V
1.195
1.255
V
8
mV
NFB1, FB2 Voltage Line Regulation
NFB1 Pin Bias Current (Note 3)
FB2 Pin Bias Current (Note 4)
Switch Off Time, Switcher 1 (Note 5)
1.2V < VIN < 12V
VNFB1= –1.23V
–40°C < TJ < 85°C
–40°C < TJ < 125°C
0.05
0.1
%/V
l 1.3
2
2.9
μA
30
80
nA
300
nA
400
ns
Switch Off Time, Switcher 2 (Note 5)
Switch VCESAT
Switch Current Limit
VFB2 > 1V
VFB2 < 0.6V
ISW = 300mA
400
ns
1.5
μs
250
350
mV
250
350
400
mA
1945fa
2
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