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| 型号： | SPX1117M3-L-2-5 |
| 厂商： | Exar Corporation |
| 文件页数： | 7/11页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.5V .8A SOT223-3 |
| 标准包装： | 78 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 2.5V |
| 输入电压： | 最高 15V |
| 电压 - 压降（标准）： | 1.1V @ 800mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 800mA |
| 电流 - 限制（最小）： | 1A |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-261-4，TO-261AA |
| 供应商设备封装： | SOT-223 |
| 包装： | 管件 |
| 其它名称： | 1016-1540-5 1016-1540-5-ND 1016-1675 SPX1117M3-L-2-5-ND |
S P X 1 1 1 7
8 0 0 m A L o w D r o p o u t V o l t a g e R e g u l a t o r
layer on the backside of the substrate. Refer
to table 1 for the results of the experiment.
The thermal interaction from other
components in the application can affect the
thermal resistance of the SPX1117. The actual
thermal resistance can be determined with
experimentation.
SPX1117 power dissipation is calculated as
follows:
Maximum Junction Temperature
Where
C: value of capacitor in Farads
F R : ripple frequency in Hz
R1: value of resistor R1 in ohms
If an ADJ-bypass capacitor is used, the
amplitude of the output ripple will be
independent of the output voltage. If an ADJ-
bypass capacitor is not used, the output ripple
will be proportional to the ratio of the output
voltage to the reference voltage:
Maximum junction
temperature
must
.
not
Where M=multiplier for the ripple seen when
the ADJ pin is optimally bypassed.
exceed 125°C.
Fig. 19: Substrate Layout for SOT-223
R IPPLE R EJECTION
Ripple rejection can be improved by adding a
capacitor between the ADJ pin and ground as
shown in Figure 23. When ADJ pin bypassing
is used, the value of the output capacitor
required increases to its maximum. If the ADJ
pin is not bypassed, the value of the output
capacitor can be lowered to 10 μ F for an
electrolytic aluminum capacitor or 2.2 μ F for a
ceramic or solid tantalum capacitor (Fig 22).
However the value of the ADJ-bypass
capacitor should be chosen with respect to the
following equation:
1
6.28
V REF =1.25V
Ripple rejection for the adjustable version is
shown in Figure 20.
Fig. 20: Ripple Rejection
V IN =3.3V, V OUT =1.8V(adj), I LOAD =200mA
O UTPUT V OLTAGE
The output of the adjustable regulator can be
set to any voltage between 1.25V and 15V.
The value of V OUT can be quickly approximated
using the formula
1.25
A small correction to this formula is required
depending on the values of resistors R1 and
R2, since the adjustable pin current (approx
50 μ A) flows through R2. When IADJ is taken
into account, the formula becomes
Where V REF =1.25V
? 2011 Exar Corporation
7/11
Rev. 2.1.0
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| SPX1117M3-L | IC REG LDO ADJ .8A SOT223-3 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SPX1117M3-L-2-5 | 制造商:Exar Corporation 功能描述:Regulator |
| SPX1117M3-L-2-5/TR | 功能描述:低压差稳压器 - LDO 800mALOW DROPOUT RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| SPX1117M3-L-2-85 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:800mA Low Dropout Voltage Regulator |
| SPX1117M3-L-2-85/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:800mA Low Dropout Voltage Regulator |
| SPX1117M3-L-3.3 | 制造商:EXAR 制造商全称:EXAR 功能描述:800mA Low Dropout Voltage Regulator |
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