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| 型号： | LTC3250ES6-1.5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 1.5V 0.25A SOT23-6 |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 1.5V |
| 输入电压： | 3.1 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 频率 - 开关： | 1.5MHz |
| 电流 - 输出： | 250mA |
| 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 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | SOT-23-6 |
LTC3250-1.5/LTC3250-1.2
OPERATIO
(Refer to Simplified Block Diagram)
Flying Capacitor Selection
Warning: A polarized capacitor such as tantalum or
Below is a list of ceramic capacitor manufacturers and
how to contact them:
aluminum should never be used for the flying capacitor
since its voltage can reverse upon start-up of the
LTC3250-1.5/LTC3250-1.2. Ceramic capacitors should
always be used for the flying capacitor.
The flying capacitor controls the strength of the charge
AVX
Kemet
Murata
Taiyo Yuden
Vishay
1-(803)-448-1943
1-(864)-963-6300
1-(800)-831-9172
1-(800)-348-2496
1-(800)-487-9437
www.avxcorp.com
www.kemet.com
www.murata.com
www.t-yuden.com
www.vishay.com
pump. In order to achieve the rated output current it is
necessary for the flying capacitor to have at least 0.4 μ F of
capacitance over operating temperature with a 2V bias
(see “Ceramic Capacitor Selection Guidelines” section). If
only 100mA or less of output current is required for the
application the flying capacitor minimum can be reduced
to 0.15 μ F.
Ceramic Capacitor Selection Guidelines
Capacitors of different materials lose their capacitance
Layout Considerations
Due to the high switching frequency and transient currents
produced by the LTC3250-1.5/LTC3250-1.2 careful board
layout is necessary for optimal performance. A true ground
plane and short connections to all capacitors will improve
performance and ensure proper regulation under all con-
ditions. Figure 2 shows the recommended layout configu-
ration.
with higher temperature and voltage at different rates. For
example, a ceramic capacitor made of X7R material will
retain most of its capacitance from –40 ° C to 85 ° C whereas
a Z5U or Y5V style capacitor will lose considerable capaci-
tance over that range (60% to 80% loss typ.). Z5U and Y5V
V IN
GND
1 μ F
1 μ F
4.7 μ F
V OUT
capacitors may also have a very strong voltage coefficient
SHDN
causing them to lose an additional 60% or more of their
LTC3250-1.5/LTC3250-1.2
3250 F02
capacitance when the rated voltage is applied. Therefore,
when comparing different capacitors it is often more
appropriate to compare the amount of achievable capaci-
tance for a given case size rather than discussing the
specified capacitance value. For example, over rated volt-
age and temperature conditions, a 4.7 μ F, 10V, Y5V
ceramic capacitor in a 0805 case may not provide any
more capacitance than a 1 μ F, 10V, X7R available in the
same 0805 case. In fact over bias and temperature range,
the 1 μ F, 10V, X7R will provide more capacitance than the
4.7 μ F, 10V, Y5V. The capacitor manufacturer’s data sheet
should be consulted to determine what value of capacitor
is needed to ensure minimum capacitance values are met
over operating temperature and bias voltage.
VIA TO GROUND PLANE
Figure 2. Recommended Layout
The flying capacitor pins, C + and C – will have very high
edge rate wave forms. The large dv/dt on these pins can
couple energy capacitively to adjacent printed circuit board
runs. Magnetic fields can also be generated if the flying
capacitors are not close to the LTC3250-1.5/LTC3250-1.2
(i.e. the loop area is large). To decouple capacitive energy
transfer, a Faraday shield may be used. This is a grounded
PC trace between the sensitive node and the LTC3250-1.5/
LTC3250-1.2 pins. For a high quality AC ground it should
be returned to a solid ground plane that extends all the way
to the LTC3250-1.5/LTC3250-1.2.
3250fa
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3251 | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converter |
| LTC3251-1.2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converter |
| LTC3251-1.5 | 制造商:LINER 制造商全称:Linear Technology 功能描述:500mA High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converter |
| LTC3251EMSE | 功能描述:IC REG BUCK SWITCHED CAP 10MSOP 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: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 |
| LTC3251EMSE#PBF | 功能描述:IC REG BUCK SWITCHED CAP 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: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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