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參數(shù)資料
| 型號： | LQH3C220 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Dual Micropower DC/DC Converter with Positive and Negative Outputs |
| 中文描述： | 雙微功率DC / DC變換器的正，負(fù)輸出 |
| 文件頁數(shù)： | 2/8頁 |
| 文件大小： | 142K |
| 代理商： | LQH3C220 |
2
LT1945
1945f
ABSOLUTEW
(Note 1)
W
W
U
PACKAGE/ORDER IU
U
W
V
IN
, SHDN1, SHDN2 Voltage ................................... 15V
SW1, SW2 Voltage .................................................. 36V
NFB1 Voltage........................................................... –3V
FB2 Voltage ...............................................................V
IN
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
LTTS
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
A
= 25
°
C. V
IN
= 1.2V, V
SHDN
= 1.2V unless otherwise noted.
The
G
denotes the specifications which apply over the full operating
PARAMETER
Minimum Input Voltage
Quiescent Current, (per Converter)
CONDITIONS
MIN
TYP
MAX
1.2
30
1
–1.255
1.255
UNITS
V
Not Switching
V
SHDN
= 0V
20
μ
A
μ
A
V
V
mV
%/V
μ
A
nA
ns
ns
μ
s
mV
mA
μ
A
μ
A
NFB1 Comparator Trip Point
FB2 Comparator Trip Point
FB Comparator Hysteresis
NFB1, FB2 Voltage Line Regulation
NFB1 Pin Bias Current (Note 3)
FB2 Pin Bias Current (Note 4)
Switch Off Time, Switcher 1 (Note 5)
Switch Off Time, Switcher 2 (Note 5)
G
–1.205
1.205
–1.23
1.23
8
0.05
2
30
400
400
1.5
250
350
2
8
G
1.2V < V
IN
< 12V
V
NFB1
= –1.23V
V
FB2
= 1.23V
0.1
2.9
80
G
1.3
G
V
FB2
> 1V
V
FB2
< 0.6V
I
SW
= 300mA
Switch V
CESAT
Switch Current Limit
SHDN Pin Current
350
400
3
12
250
V
SHDN
= 1.2V
V
SHDN
= 5V
SHDN Input Voltage High
SHDN Input Voltage Low
Switch Leakage Current
0.9
V
V
0.25
5
Switch Off, V
SW
= 5V
0.01
μ
A
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
T
JMAX
= 125
°
C,
θ
JA
= 160
°
C/W
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
V
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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