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CD43-4R7 数据表(PDF) 2 Page - Linear Technology

部件名 CD43-4R7
功能描述  Dual Micropower DC/DC Converter with Positive and Negative Outputs
Download  8 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

CD43-4R7 数据表(HTML) 2 Page - Linear Technology

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2
LT1945
1945f
ABSOLUTE
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
(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
ORDER PART
NUMBER
LT1945EMS
MS PART MARKING
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum Input Voltage
1.2
V
Quiescent Current, (per Converter)
Not Switching
20
30
µA
VSHDN = 0V
1
µA
NFB1 Comparator Trip Point
q
–1.205
–1.23
–1.255
V
FB2 Comparator Trip Point
q
1.205
1.23
1.255
V
FB Comparator Hysteresis
8mV
NFB1, FB2 Voltage Line Regulation
1.2V < VIN < 12V
0.05
0.1
%/V
NFB1 Pin Bias Current (Note 3)
VNFB1 = –1.23V
q
1.3
2
2.9
µA
FB2 Pin Bias Current (Note 4)
VFB2 = 1.23V
q
30
80
nA
Switch Off Time, Switcher 1 (Note 5)
400
ns
Switch Off Time, Switcher 2 (Note 5)
VFB2 > 1V
400
ns
VFB2 < 0.6V
1.5
µs
Switch VCESAT
ISW = 300mA
250
350
mV
Switch Current Limit
250
350
400
mA
SHDN Pin Current
VSHDN = 1.2V
2
3
µA
VSHDN = 5V
8
12
µA
SHDN Input Voltage High
0.9
V
SHDN Input Voltage Low
0.25
V
Switch Leakage Current
Switch Off, VSW = 5V
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 LT1945 is guaranteed to meet performance specifications
from 0
°C to 70°C. Specifications over the –40°C to 85°C operating
TJMAX = 125°C, θJA = 160°C/W
temperature range, otherwise specifications are at TA = 25°C. VIN = 1.2V, VSHDN = 1.2V unless otherwise noted.
LTTS
Consult LTC Marketing for parts specified with wider operating temperature ranges.
1
2
3
4
5
NFB1
SHDN1
GND
SHDN2
FB2
10
9
8
7
6
SW1
PGND
VIN
PGND
SW2
TOP VIEW
MS PACKAGE
10-LEAD PLASTIC MSOP
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Bias current flows out of the NFB1 pin.
Note 4: Bias current flows into the FB2 pin.
Note 5: See Figure 1 for Switcher 1 and Switcher 2 locations.


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