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参数资料
| 型号： | LT1945EMS#TR |
| 厂商： | Linear Technology |
| 文件页数： | 1/8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
Dual Micropower DC/DC
Converter with Positive and
Negative Outputs
FEATURES
DESCRIPTION
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Generates Well-Regulated Positive and
Negative Outputs
Low Quiescent Current:
20μA in Active Mode (per Converter)
<1μA in Shutdown Mode
Operates with V IN as Low as 1.2V
Low V CESAT Switch: 250mV at 300mA
Uses Small Surface Mount Components
High Output Voltage: Up to ± 34V
Tiny 10-Pin MSOP Package
The LT ? 1945 is a dual micropower DC/DC converter in a
10-pin MSOP package. Each converter is designed with
a 350mA current limit and an input voltage range of 1.2V
to 15V, making the LT1945 ideal for a wide variety of ap-
plications. Both converters feature a quiescent current of
only 20μA at no load, which further reduces to 0.5μA in
shutdown. A current limited, ?xed off-time control scheme
conserves operating current, resulting in high ef?ciency
over a broad range of load current. The 36V switch allows
high voltage outputs up to ± 34V to be easily generated
APPLICATIONS
without the use of costly transformers. The LT1945’s
low off-time of 400ns permits the use of tiny, low pro?le
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Small TFT LCD Panels
Handheld Computers
Battery Backup
Digital Cameras
inductors and capacitors to minimize footprint and cost
in space-conscious portable applications.
L , LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Dual Output (+12V, –20V) Converter
Ef?ciency at V IN = 3.6V
V IN
2.7V
TO 5V
8
L1
10μH
C4
0.1μF
10
D1
–20V
10mA
90
85
80
+12V OUTPUT
C1
4.7μF
2
4
V IN
SHDN1
SHDN2
LT1945
SW1
NFB1
FB2
1
5
D2
100pF
365k
24.9k
C2
1μF
75
70
65
–20V OUTPUT
GND PGND PGND SW2
60
3
7
L2
10μH
9
6
4.7pF
D3
115k
1M
C3
1μF
12V
55
50
0.1
1 10
LOAD CURRENT (mA)
100
1945 TA01a
20mA
C1: TAIYO YUDEN JMK212BJ475
1945 TA01
C2, C3: TAIYO YUDEN TMK316BJ105
C4: TAIYO YUDEN EMK107BJ104
D1, D2, D3: ZETEX ZHCS400
L1, L2: MURATA LQH3C100
1945fa
1
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相关代理商/技术参数 |
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| LT1945IMS#PBF | 功能描述:IC REG MULTI CONFIG ADJ 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 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:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LT1945IMS#TRPBF | 功能描述:IC REG MULTI CONFIG ADJ 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 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:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LT1946 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.2MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start |
| LT1946/LT1946A | 制造商:LINER 制造商全称:Linear Technology 功能描述:4A, 2MHz Dual Phase Step-Up DC/DC Converter in 3mm 3mm DFN |
| LT1946A | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.2MHz Step-Up DC/DC Converter in SOT-23 |
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