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| 型号： | FAN2515S25X |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 3/10页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.5V .2A SOT23-5 |
| 产品变化通告： | Mold Compound Change 29/Sept/2008 |
| 标准包装： | 3,000 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 2.5V |
| 输入电压： | 2.7 V ~ 6.5 V |
| 电压 - 压降（标准）： | 0.17V @ 200mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 200mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 带卷 (TR) |
FAN2514/FAN2515
Depending on the model selected, a number of control and
status functions are available to enhance the operation of the
LDO regulator. An Enable pin, available on all devices,
allows the user to shut down the regulator output to conserve
power, reducing supply current to less than 1μA. The
adjustable-voltage versions of the device utilize pin 4 to
connect to an external voltage divider which feeds back to
the regulator error ampli?er, thereby setting the voltage as
desired. Two other functions are available at pin 4 in the
?xed-voltage versions: in noise-sensitive applications, an
external Bypass capacitor connection is provided that allows
the user to achieve optimal noise performance at the output,
while the Error output functions as a diagnostic ?ag to
indicate that the output voltage has dropped more than 5%
below the nominal ?xed voltage.
PRODUCT SPECIFICATION
Bypass Capacitor (FAN2514 Only)
In the ?xed-voltage con?guration, connecting a capacitor
between the bypass pin and ground can signi?cantly reduce
noise on the output. Values ranging from 470pF to 10nF can
be used, depending on the sensitivity to output noise in the
application.
At the high-impedance Bypass pin, care must be taken in the
circuit layout to minimize noise pickup, and capacitors must
be selected to minimize current loading (leakage). Noise
pickup from external sources can be considerable. Leakage
currents into the Bypass pin will directly affect regulator
accuracy and should be kept as low as possible; thus, high-
quality ceramic and ?lm types are recommended for their
low leakage characteristics. Cost-sensitive applications not
concerned with noise can omit this capacitor.
Applications Information
Control Functions
External Capacitors – Selection
The FAN2514/15 allows the user to utilize a wide variety of
capacitors compared to other LDO products. An innovative
design approach offers signi?cantly reduced sensitivity to
ESR (Effective Series Resistance), which degrades regulator
loop stability in older designs. While the improvements fea-
tured in the FAN2514/15 family greatly simplify the design
task, capacitor quality still must be considered if the designer
is to achieve optimal circuit performance. In general,
ceramic capacitors offer superior ESR performance, at a
lower cost and a smaller case size than tantalums. Those with
X7R or Y5Vdielectric offer the best temperature coef?cient
characteristics. The combination of tolerance and variation
over temperature in some capacitor types can result in signif-
icant variations, resulting in unstable performance over rated
conditions.
Input Capacitor
An input capacitor of 2.2μF (nominal value) or greater,
connected between the Input pin and Ground, located in
close proximity to the device, will improve transient
response and noise rejection. Higher values will offer supe-
rior input ripple rejection and transient response. An input
capacitor is recommended when the input source, either a
battery or a regulated AC voltage, is located far from the
device. Any good quality ceramic, tantalum, or metal ?lm
capacitor will give acceptable performance, however tanta-
lum capacitors with a surge current rating appropriate to the
application must be selected to avoid catastrophic failure.
Output Capacitor
An output capacitor is required to maintain regulator loop
stability. Unlike many other LDO regulators, the
FAN2514/15 family of products are nearly insensitve to
output capacitor ESR. Stable operation will be achieved with
a wide variety of capacitors with ESR values ranging from
10m ? to 10 ? or more. Tantalum or aluminum electrolytic,
or multilayer ceramic types can all be used. A nominal value
of at least 1μF is recommended.
REV. 1.1.0 01/10/13
Enable Pin
Applying a voltage of 0.8V or less at the Enable pin will
disable the output, reducing the quiescent output current to
less than 1μA, while a voltage of 1.5V or greater will enable
the device. If this shutdown function is not needed, the pin
can simply be connected to the V IN pin. Allowing this pin to
?oat will cause erratic operation.
Error Flag (FAN2515 only)
To indicate conditions such as input voltage dropout
(low V IN ), overheating, or overloading (excessive output
current), the ERR pin indicates a fault condition. It is an
open-drain output which is HIGH when the voltage at V OUT
is greater than 95% of the nominal rated output voltage and
LOW when V OUT is less than 95% or the rated output
voltage, as speci?ed in the error trip level characteristics.
A logic pullup resistor of 100K ? is recommended at this
output. The pin can be left disconnected if unused.
Thermal Protection
The FAN2514/15 is designed to supply high peak output cur-
rents of up to 1A for brief periods, however this output load
will cause the device temperature to increase and exceed
maximum ratings due to power dissipation. During output
overload conditions, when the die temperature exceeds the
shutdown limit temperature of 150°C, onboard thermal
protection will disable the output until the temperature drops
below this limit, at which point the output is then re-enabled.
During a thermal shutdown situation the user may assert the
power-down function at the Enable pin, reducing power
consumption to the minimum level I GND · V IN .
3
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN2515S25X_Q | 功能描述:低压差稳压器 - LDO LDO Voltage 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 |
| FAN2515S26 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:VOLT REGULATOR|FIXED|+2.6V|CMOS|TSOP|6PIN|PLASTIC |
| FAN2515S26X | 功能描述:低压差稳压器 - LDO LDO Voltage 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 |
| FAN2515S27 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Positive Fixed Voltage Regulator |
| FAN2515S27X | 功能描述:低压差稳压器 - LDO LDO Voltage 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 |
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