- 您现在的位置：买卖IC网 > PDF目录21984 > FAN2504S30X (Fairchild Semiconductor)IC REG LDO 3V .2A SOT23-5 PDF资料下载
参数资料
| 型号： | FAN2504S30X |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3V .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： | 3V |
| 输入电压： | 最高 6.5V |
| 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) |
Functional Description
Designed utilizing CMOS process technology, the
FAN2504 is carefully optimized for use in compact bat-
tery-powered devices. It 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, com-
paring the load voltage at the output with an onboard
low-drift bandgap 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. Pro-
tection circuitry is provided onboard for overload condi-
tions. If the device reaches temperatures exceeding the
specified maximums, 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 if space, cost, and performance
requirements while enjoying 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, allows the user
to shut down the regulator output to conserve power,
reducing supply current to less than 1 μ A. The adjust-
able-voltage version of the device utilize pin 4 to connect
to an external voltage divider which feeds back to the
regulator error amplifier, thereby setting the voltage as
desired. Two other functions are available at pin 4 in the
fixed-voltage version: 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 diagnos-
tic flag to indicate that the output voltage has dropped
more than 5% below the nominal fixed voltage.
Applications Information
External Capacitors – Selection
The FAN2504 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 if the designer is to achieve opti-
mal 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
Y5V dielectric offer the best temperature coefficient
? 2010 Fairchild Semiconductor Corporation
FAN2504 Rev. 2.1.0
9
characteristics. The combination of tolerance and varia-
tion over temperature in some capacitor types can result
in significant variations, resulting in unstable perfor-
mance over the 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 give 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
FAN2504 is nearly insensitve to output capacitor ESR.
Stable operation achieved with a wide variety of capaci-
tors with ESR values ranging from 10 m ? to 10 ? or
more. Tantalum or aluminum electrolytic, or multilayer
ceramic types can be used. A nominal value of at least 1
μ F is recommended.
Bypass Capacitor
In the fixed-voltage configuration, connecting a capacitor
between the bypass pin and ground can significantly
reduce noise on the output. Values ranging from 470pF
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. 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 appli-
cations 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
相关PDF资料 |
PDF描述 |
|---|---|
| DEPV09S565GTLF | CONN DSUB SOCKET 9POS R/A PCB |
| FAN2504S28X | IC REG LDO 2.8V .2A SOT23-5 |
| XC3S1200E-4FGG320C | IC SPARTAN-3E FPGA 1200K 320FBGA |
| FAN2504S285X | IC REG LDO 2.85V .2A SOT23-5 |
| XC3S400-4FGG456C | IC SPARTAN-3 FPGA 400K 456-FBGA |
相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN2504S33 | 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 |
| FAN2504S33X | 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 |
| FAN2504S33X_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 |
| FAN2504SX | 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 |
| FAN2504SX_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 |
发布紧急采购，3分钟左右您将得到回复。