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| 型号： | FAN2558S35X |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 6/15页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.5V .18A SOT23-5 |
| 产品变化通告： | Mold Compound Change 12/Dec/2007 |
| 标准包装： | 3,000 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3.5V |
| 输入电压： | 最高 5.5V |
| 稳压器数量： | 1 |
| 电流 - 输出： | 180mA（最小值） |
| 电流 - 限制（最小）： | 260mA |
| 工作温度： | -40°C ~ 85°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) |
FAN2558/FAN2559
Functional Description
Utilizing BiCMOS technology, the FAN2525/FAN2559
product family is optimized for use in compact battery pow-
ered systems. These LDOs offer a unique combination of
high ripple rejection, low noise, low power consumption,
high tolerance for a variety of output capacitors, and less
than 1μA “OFF” current. In the circuit, a differential current
sense ampli ? er controls a series-pass P-Channel MOSFET to
achieve high ripple rejection. A separate error ampli ? er com-
pares the load voltage at the output with an onboard trimmed
low voltage bandgap reference for output regulation.
Thermal shutdown and current limit circuits protect the
device under extreme conditions. When the device tempera-
ture reaches 150 ° C, the output is disabled. When the device
cools down by 10 ° C, it is re-enabled. The user can shut down
the device using the Enable control pin at any time. The cur-
rent limit circuit is trimmed, which leads to consistent power
on /enable delays, and provides safe short circuit current
densities even in narrow traces of the PCB.
A carefully optimized control loop accommodates a wide
range of ESR values in the output bypass capacitor, allowing
the user to optimize space, cost, and performance require-
ments.
An Enable pin shuts down the regulator output to conserve
power, reducing supply current to less than 1μA.
The ? xed-voltage FAN2559 has a noise bypass pin. Power
Good is available as a diagnostic function to indicate that the
output voltage has reduced within 5% of the nominal value.
The six pin adjustable-voltage version utilizes pin 5 to con-
nect to an external voltage divider which feeds back to the
regulator error ampli ? er, thus setting the output voltage to
the desired value.
Applications Information
External Capacitors – Selection
The FAN2558/FAN2559 gives the user the ? exibility to uti-
lize a wide variety of capacitors compared to other LDOs.
An innovative design approach offers signi ? cantly reduced
sensitivity to ESR, which degrades regulator loop stability in
older designs. While the improvements featured in the
FAN2558/FAN2559 family greatly simplify the design task,
6
PRODUCT SPECIFICATIONS
capacitor quality still must be considered if the designer is to
achieve optimal circuit performance. In general, ceramic
capacitors offer superior ESR performance, and a smaller
case size than tantalum capacitors.
Input Capacitor
An input capacitor of 2.2μF (nominal value) or greater,
connected between the Input pin and Ground, placed in close
proximity to the device, will improve transient response and
ripple rejection. Higher values will further improve ripple
rejection and transient response. An input capacitor is rec-
ommended when the input source, either a battery or a regu-
lated AC voltage, is located far from the device. Any good
quality ceramic, tantalum, or metal ? lm capacitor will give
acceptable performance; however, in extreme cases capacitor
surge current ratings may have to be considered.
Output Capacitor
An output capacitor is required to maintain regulator loop
stability. Stable operation will be achieved with a wide vari-
ety of capacitors with ESR values ranging from 0m ? up to
400m ? . Multilayer ceramic, tantalum or aluminum electro-
lytic capacitors may be used. A nominal value of at least 1μF
is recommended. Note that the choice of output capacitor
affects load transient response, ripple rejection, and it has a
slight effect on noise performance as well.
An internal resistor of approximately 100 ? is connected
between V OUT and GND in shutdown mode, to discharge the
output capacitor at a faster rate.
Bypass Capacitor (FAN2559 Only)
In the ? xed-voltage con ? guration, connecting a capacitor
between the bypass pin and ground can signi ? cantly reduce
output noise. Values ranging from 0pF to 47nF can be used,
depending on the sensitivity to output noise in the applica-
tion.
At the high-impedance Bypass pin, care must be taken in the
PCB 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.
REV. 1.0.4 3/15/04
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN2558S36X | 功能描述:低压差稳压器 - LDO 180mA Low Voltage LDO 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 |
| FAN2558S38X | 功能描述:低压差稳压器 - LDO 180mA Low Voltage LDO 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 |
| FAN2558SX | 功能描述:低压差稳压器 - LDO 180ma CMOS LDO Low 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 |
| FAN2558SX | 制造商:Fairchild Semiconductor Corporation 功能描述:Linear Voltage Regulator IC |
| FAN2558SX_NL | 功能描述:低压差稳压器 - LDO Adjust Low Volt LDO W/FS Enable VD 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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