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参数资料
| 型号： | FAN2502S315X |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.15V .15A 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： | 3.15V |
| 输入电压： | 最高 6.5V |
| 电压 - 压降（标准）： | 0.15V @ 150mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 150mA |
| 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) |
Functional Description
Designed utilizing CMOS process technology, the
FAN2502 / 03 family of products are carefully optimized
for use in compact battery-powered devices. They offer a
unique combination of low power consumption,
extremely low dropout voltages, high tolerance for a vari-
ety of output capacitors, and the ability to disable the out-
put to less than 1 μ A under user control. In the circuit, a
differential amplifier controls the current through a
series-pass P-channel MOSFET, comparing the load
voltage at the output 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 when compared to older
bipolar pass-transistor designs. Protection circuitry is
provided onboard for overload conditions. If the device
reaches temperatures exceeding the specified maxi-
mums, an onboard circuit shuts down the output, where
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 accomodated, allowing the user to select a
capacitor meeting space, cost, and performance require-
ments; and enjoy reliable operation over temperature,
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. 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
The FAN2502/03 supports a wide variety of capacitors
compared 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 if the designer is to achieve opti-
mal circuit performance. In general, ceramic capacitors
offer superior ESR performance, at a lower cost and
? 2010 Fairchild Semiconductor Corporation
FAN2502 / FAN2503 Rev. 1.1.0
9
a smaller case size than tantalums. Those with X7R or
Y5Vdielectric offer the best temperature coefficient char-
acteristics. The combination of tolerance and variation
over temperature in some capacitor types can result in
significant variations, resulting 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
FAN2502 / 03 family of products are nearly insensitve 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 or aluminum elec-
trolytic, or multilayer ceramic types can all be used. A
nominal value of at least 1 μ F is recommended.
Bypass Capacitor (FAN2502 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 capaci-
tors must be selected to minimize current loading (leak-
age). Noise pickup from external sources can be
considerable. Leakage currents into the Bypass pin
directly affects regulator accuracy and should be kept as
low as possible; high-quality ceramic and film types are
recommended for their low leakage characteristics.
Cost-sensitive applications 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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| FAN2502S33 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:VOLT REGULATOR|FIXED|+3.3V|CMOS|TSOP|6PIN|PLASTIC |
| FAN2502S33X | 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 |
| FAN2502S33X_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 |
| FAN2502SX | 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 |
| FAN2502SX_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 |
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