参数资料
| 型号： | SC1565I5M2.5TRT |
| 厂商： | Semtech |
| 文件页数： | 8/14页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.5V 1.5A TO-263-5 |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 2.5V |
| 输入电压： | 最高 5.5V |
| 电压 - 压降（标准）： | 0.27V @ 1.5A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1.5A |
| 电流 - 限制（最小）： | 1.6A |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-6，D²Pak（5 引线+接片），TO-263BA |
| 供应商设备封装： | TO-263-5 |
| 包装： | 标准包装 |
| 产品目录页面： | 1358 (CN2011-ZH PDF) |
| 其它名称： | SC1565I5M2.5DKR |
SC1565
POWER MANAGEMENT
Applications Information
Introduction
The SC1565 is intended for applications such as
graphics cards where high current capability and very low
dropout voltage are required. It provides a very simple,
low cost solution that uses very little pcb real estate.
Additional features include an enable pin to allow for a
very low power consumption standby mode, and a fully
adjustable output.
Thermal Considerations
The power dissipation in the SC1565 is approximately
equal to the product of the output current and the input
to output voltage differential:
P D ≈ ( VIN ? VOUT ) ? I O
The absolute worst-case dissipation is given by:
Component Selection
P D ( MAX ) = ( VIN
( MAX )
? VOUT
( MIN )
) ? I
O ( MAX )
+ VIN
( MAX )
? I Q ( MAX )
Input capacitor: a 4.7μF ceramic capacitor is
recommended. This allows for the device being some
distance from any bulk capacitance on the rail.
Additionally, input droop due to load transients is reduced,
improving load transient response. Additional capacitance
may be added if required by the application.
Output capacitor: a minimum bulk capacitance of 2.2μF,
along with a 0.1μF ceramic decoupling capacitor is
recommended. Increasing the bulk capacitance will
improve the overall transient response. The use of
For a typical scenario, V IN = 3.3V ± 5%, V OUT = 2.8V and
I O = 1.5A, therefore:
V IN(MAX) = 3.465V, V OUT(MIN) = 2.744V and I Q(MAX) = 1.75mA,
Thus P D(MAX) = 1.09W.
Using this figure, and assuming T A(MAX) = 70°C, we can
calculate the maximum thermal impedance allowable to
maintain T J ≤ 150°C:
) = ( 150 ? 70 ) = 73 . 4 ° C / W
multiple lower value ceramic capacitors in parallel to
achieve the desired bulk capacitance will not cause
stability issues. Although designed for use with ceramic
output capacitors, the SC1565 is extremely tolerant of
R TH ( J ? A )( MAX ) =
( T J ( MAX ) ? T A ( MAX )
P D ( MAX )
.
109
output capacitor ESR values and thus will also work
comfortably with tantalum output capacitors. For refer-
ence, the phase-margin contour of Figure 1 can be used
to choose an appropriate output capacitor for a given
stability requirement.
Noise immunity: in very electrically noisy environments,
it is recommended that 0.1μF ceramic capacitors be
placed from IN to GND and OUT to GND as close to the
device pins as possible.
External voltage selection resistors: the use of 1%
resistors, and designing for a current flow ≥ 10μA is
recommended to ensure a well regulated output (thus
R2 ≤ 120k ? ).
This should be achievable for the SO-8 package using
pcb copper area to aid in conducting the heat away, such
as one square inch of copper connected to the ground
pins of the device. The SOT-223, TO-220 and TO-263
packages would not require heatsinking. Internal ground/
power planes and air flow will also assist in removing
heat. For higher ambient temperatures it may be neces-
sary to use additional copper area.
? 2005 Semtech Corp.
8
www.semtech.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC1565I5M-X.XTR | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Very Low Dropout 1.5 Amp Regulator With Enable |
| SC1565I5MX.XTRT | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Very Low Dropout 1.5 Amp Regulator With Enable |
| SC1565I5T-1.8 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:VERY LOW DROPOUT 1.5 AMP REGULATOR WITH ENABLE |
| SC1565I5T-2.5 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:VERY LOW DROPOUT 1.5 AMP REGULATOR WITH ENABLE |
| SC1565I5T-X.X | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Very Low Dropout 1.5 Amp Regulator With Enable |
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