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参数资料
| 型号： | LT1945EMS#TR |
| 厂商： | Linear Technology |
| 文件页数： | 2/8页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG ADJ 10MSOP |
| 标准包装： | 2,500 |
| 类型： | 升压（升压），反相，回扫，Sepic |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 1.23 V ~ 36 V |
| 输入电压： | 1.2 V ~ 15 V |
| 电流 - 输出： | 350mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-MSOP |
| 其它名称： | LT1945EMSTR |
LT1945
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PIN CONFIGURATION
V IN , SHDN1 , SHDN2 Voltage.....................................15V
SW1, SW2 Voltage ....................................................36V
NFB1 Voltage ............................................................ –3V
NFB1
SHDN1
GND
SHDN2
1
2
3
4
TOP VIEW
10
9
8
7
SW1
PGND
V IN
PGND
FB2 Voltage ............................................................... VIN
Current into NFB1 Pin ............................................–1mA
FB2
5 6
MS PACKAGE
10-LEAD PLASTIC MSOP
SW2
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 INFORMATION
T JMAX = 125°C, θ JA = 160°C/W
LEAD FREE FINISH
LT1945EMS#PBF
LT1945IMS#PBF
LEAD BASED FINISH
LT1945EMS
LT1945IMS
TAPE AND REEL
LT1945EMS#TRPBF
LT1945IMS#TRPBF
TAPE AND REEL
LT1945EMS#TR
LT1945IMS#TR
PART MARKING*
LTTS
LTTS
PART MARKING*
LTTS
LTTS
PACKAGE DESCRIPTION
10-Lead Plastic MSOP
10-Lead Plastic MSOP
PACKAGE DESCRIPTION
10-Lead Plastic MSOP
10-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 125°C
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 125°C
Consult LTC Marketing for parts speci?ed with wider operating temperature ranges. *The temperature grade is identi?ed 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 speci?cations, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS The l denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C. V IN = 1.2V, V SHDN = 1.2V unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum Input Voltage
1.2
V
Quiescent Current, (per Converter)
Not Switching
V SHDN = 0V
20
30
1
μA
μA
NFB1 Comparator Trip Point
FB2 Comparator Trip Point
–40°C < T J < 85°C
–40°C < T J < 125°C
–40°C < T J < 85°C
–40°C < T J < 125°C
–1.205
–1.195
1.205
1.195
–1.23
1.23
–1.255
1.255
1.255
1.255
V
V
V
V
FB Comparator Hysteresis
8
mV
NFB1, FB2 Voltage Line Regulation
1.2V < V IN < 12V
0.05
0.1
%/V
NFB1 Pin Bias Current (Note 3)
FB2 Pin Bias Current (Note 4)
V NFB1 = –1.23V
–40°C < T J < 85°C
l
1.3
2
30
2.9
80
μA
nA
Switch Off Time, Switcher 1 (Note 5)
–40°C < T J < 125°C
400
300
nA
ns
Switch Off Time, Switcher 2 (Note 5)
V FB2 > 1V
V FB2 < 0.6V
400
1.5
ns
μs
Switch V CESAT
Switch Current Limit
I SW = 300mA
250
250
350
350
400
mV
mA
1945fa
2
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