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| 型号： | FAN2500S33X |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.3V .1A SOT-23-5 |
| 产品变化通告： | Mold Compound Change 12/Dec/2007 |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3.3V |
| 输入电压： | 最高 6.5V |
| 电压 - 压降（标准）： | 0.1V @ 100mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 100mA |
| 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： | 标准包装 |
| 产品目录页面： | 1221 (CN2011-ZH PDF) |
| 其它名称： | FAN2500S33XDKR |
Functional Description
Designed utilizing CMOS process technology, the
FAN2500 is carefully optimized for use in compact bat-
tery-powered devices. The FAN2500 offers a unique
combination of low power consumption, extremely low
dropout voltages, high tolerance for a variety of output
capacitors, and the ability to disable the output to less
than 1 μ A under user control. In the circuit, a difference
amplifier controls the current through a series-pass P-
channel MOSFET, comparing the load voltage at the out-
put with an onboard low-drift band-gap reference. The
series resistance of the pass P-channel MOSFET is
approximately 1 ? , resulting in an unusually low dropout
voltage under load compared to older bipolar pass-tran-
sistor designs.
Protection circuitry is provided onboard for overload con-
ditions. If the device reaches temperatures exceeding
the specified maximums, an onboard circuit shuts down
the output and it remains suspended until it has cooled
before re-enabling. The user can shut down the device
using the Enable control pin at any time.
Careful design of the output regulator amplifier assures
loop stability over a wide range of ESR values in the
external output capacitor. A wide range of values and
types can be accommodated, allowing the user to select
a capacitor meeting space, cost, and performance
requirements; and still enjoy reliable operation over tem-
perature, load, and tolerance variations.
Depending on the model selected, a number of control
and status functions are available to enhance the opera-
tion of the LDO regulator. An Enable pin, available on all
devices, allows the user to shut down the regulator out-
put to conserve power, reducing supply current to less
than 1 μ A. The adjustable-voltage versions of the device
utilize pin 4 to connect to an external voltage divider that
feeds back to the regulator error amplifier, thereby set-
ting the voltage as desired. Two other functions are avail-
able at pin 4 in the fixed-voltage versions: in noise-
sensitive applications, an external bypass capacitor con-
nection is provided that allows the user to achieve opti-
mal noise performance at the output, while the error
output functions as a diagnostic flag to indicate that the
output voltage has dropped more than 5% below the
nominal fixed voltage.
Applications Information
External Capacitors – Selection
FAN2500 supports a wide variety of capacitors com-
pared to other LDO products. An innovative design
approach offers significantly reduced sensitivity to ESR
(Equivalent Series Resistance), which degrades regula-
tor loop stability in older designs. While the improve-
ments greatly simplify the design task, capacitor quality
still must be considered to achieve optimal circuit perfor-
mance.
? 2010 Fairchild Semiconductor Corporation
FAN2500 Rev. 1.1.0
9
In general, ceramic capacitors offer superior ESR perfor-
mance at a lower cost and a smaller case size than tan-
talum. Those with X7R or Y5V dielectric offer the best
temperature coefficient characteristics. The combination
of tolerance and variation over temperature in some
capacitor types can result in significant variations, result-
ing in unstable performance over rated conditions.
Input Capacitor
An input capacitor of 2.2 μ F (nominal value) or greater,
connected between the Input pin and ground, located in
close proximity to the device, improves transient
response and noise rejection. Higher values 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 film capacitor gives acceptable performance; how-
ever, tantalum 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
FAN2500 is nearly insensitive to output capacitor ESR.
Stable operation is achieved with a wide variety of
capacitors with ESR values ranging from 10 m ? to 10 ?
or more. Tantalum, aluminum electrolytic, or multilayer
ceramic can be used. A nominal value of at least 1 μ F is
recommended.
Bypass Capacitor (FAN2500 Only)
In the fixed-voltage configuration, connecting a capacitor
between the Bypass pin and ground can significantly
reduce noise on the output. Values ranging from 470 pF
to 10 nF 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 directly affect regu-
lator accuracy and should be kept as low as possible;
high-quality ceramic and film types are recommended for
their low leakage characteristics. Cost-sensitive applica-
tions not concerned with noise can omit this capacitor.
Control Functions
Enable Pin
Applying a voltage of 0.4 V or less at the Enable pin dis-
ables the output, reducing the quiescent output current
to less than 1 μ A; while a voltage of 2.0 V or greater
enables the device. If this shutdown function is not
needed, the pin can be connected to the V IN pin. Allow-
ing this pin to float causes erratic operation.
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN2500S33X_Q | 功能描述:低压差稳压器 - LDO 100 mA CMOS 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 |
| FAN2500SX | 功能描述:低压差稳压器 - LDO 100 mA CMOS 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 |
| FAN2500SX_Q | 功能描述:低压差稳压器 - LDO 100 mA CMOS 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 |
| FAN2501 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:100 mA CMOS LDO Regulators |
| FAN2501S25 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:VOLT REGULATOR|FIXED|+2.5V|CMOS|TSOP|6PIN|PLASTIC |
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