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参数资料
| 型号： | LT1945IMS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/8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 ~ 125°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 |
LT1945
APPLICATIONS INFORMATION
of related parts.
Table 2. Recommended Capacitors
Diode Selection
For most LT1945 applications, the Zetex ZHCS400 sur-
CAPACITOR TYPE
Ceramic
Ceramic
Ceramic
VENDOR
Taiyo Yuden
(408) 573-4150
www.t-yuden.com
AVX
(803) 448-9411
www.avxcorp.com
Murata
(714) 852-2001
face mount Schottky diode (0.4A, 40V) is an ideal choice.
Schottky diodes, with their low forward voltage drop and
fast switching speed, are the best match for the LT1945.
The Motorola MBR0520, MBR0530, or MBR0540 can also
be used. Many different manufacturers make equivalent
parts, but make sure that the component is rated to handle
at least 0.35A.
www.murata.com
Setting the Output Voltages
Set the output voltage for Switcher 1 (negative output
voltage ) by choosing the appropriate values for feedback
resistors R1 and R2.
Lowering Output Voltage Ripple
Using low ESR capacitors will help minimize the output
ripple voltage, but proper selection of the inductor and the
output capacitor also plays a big role. The LT1945 provides
energy to the load in bursts by ramping up the inductor
(
+ 2 ? 10 ? 6
R 1 =
V OUT – 1 . 23 V
1. 23 V
R 2
)
current, then delivering that current to the load. If too large
of an inductor value or too small of a capacitor value is
used, the output ripple voltage will increase because the
capacitor will be slightly overcharged each burst cycle.
R 1 = R 2 ? OUT ? 1 ?
Set the output voltage for Switcher 2 (positive output
voltage) by choosing the appropriate values for feedback
resistors R1B and R2B (see Figure 1).
? V ?
? 1 . 23 ?
To reduce the output ripple, increase the output capacitor
value or add a 4.7pF feed-forward capacitor in the feedback
network of the LT1945 (see the circuits in the Typical Ap-
plications section). Adding this small, inexpensive 4.7pF
capacitor will greatly reduce the output voltage ripple.
PACKAGE DESCRIPTION
MS Package
10-Lead Plastic MSOP
3.00
0.102
0.889
(.035
0.127
.005)
(Reference LTC DWG # 05-08-1661)
(.118 .004)
(NOTE 3)
10 9 8 7 6
0.497 0.076
(.0196 .003)
REF
5.23
(.206)
MIN
3.2 – 3.45
(.126 – .136)
0.254
(.010)
DETAIL “A”
0 – 6 TYP
4.88
(.192
0.10
.004)
3.00 0.102
(.118 .004)
NOTE 4
0.305
(.0120
0.038
.0015)
0.50
(.0197)
GAUGE PLANE
1 2 3 4 5
TYP
BSC
0.53
0.01
RECOMMENDED SOLDER PAD LAYOUT
DETAIL “A”
(.021
.006)
1.10
(.043)
MAX
0.86
(.034)
REF
0.18
(.007)
SEATING
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
PLANE
0.17 –?0.27
(.007 – .011)
0.50
(.0197)
TYP
0.13 0.05
(.005 .002)
MSOP (MS) 0402
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
1945fa
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
7
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| LT1946AEMS8E | 功能描述:IC REG BOOST ADJ 1.5A 8MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:500 系列:- 类型:切换式电容器（充电泵），反相 输出类型:固定 输出数:1 输出电压:-3V 输入电压:2.3 V ~ 5.5 V PWM 型:Burst Mode? 频率 - 开关:900kHz 电流 - 输出:100mA 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:SOT-23-6 细型，TSOT-23-6 包装:带卷 (TR) 供应商设备封装:TSOT-23-6 其它名称:LTC1983ES6-3#TRMTR |
| LT1946AEMS8E#PBF | 功能描述:IC REG BOOST ADJ 1.5A 8MSOP 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:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
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