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| 型号： | FAN2510S26X |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.6V .1A 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： | 2.6V |
| 输入电压： | 2.7 V ~ 6.5 V |
| 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： | 带卷 (TR) |
Functional Description
Designed utilizing CMOS process technology, the
FAN2510 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 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 con-
ditions. 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.
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 output can then be re-Enabled within
500 μ s, fulfilling the fast power-cycling needs of Mobile
applications. The adjustable voltage version utilize pin 4
to connect to an external voltage divider which feeds
back to the regulator error amplifier, thereby setting the
voltage as desired.
Applications Information
External Capacitors – Selection
The FAN2510 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 simplifies 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 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.
? 2010 Fairchild Semiconductor Corporation
FAN2510 Rev. 1.1.0
9
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
FAN2510 is 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 electrolytic, or multilayer
ceramic types can be used. A nominal value of at least 1
μ F is recommended.
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.
Thermal Protection
The FAN2510 supply high peak output currents of up to
1 A for brief periods; however, this output load causes
the device temperature to increase and exceed maxi-
mum ratings due to power dissipation. During output
overload conditions, when the die temperature exceeds
the shutdown limit temperature of 150°C, onboard ther-
mal protection disables the output until the temperature
drops below this limit; at which point, the output is 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 .
www.fairchildsemi.com
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