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參數(shù)資料
| 型號(hào)： | FAN2559S18X |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 180mA Low Voltage CMOS LDO |
| 中文描述： | 1.8 V FIXED POSITIVE LDO REGULATOR, PDSO6 |
| 封裝： | SOT-23, 6 PIN |
| 文件頁(yè)數(shù)： | 6/15頁(yè) |
| 文件大?。?/td> | 307K |
| 代理商： | FAN2559S18X |
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FAN2558/FAN2559
PRODUCT SPECIFICATIONS
6
REV. 1.0.4 3/15/04
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
fi
er controls a series-pass P-Channel MOSFET to
achieve high ripple rejection. A separate error ampli
fi
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
fi
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
fi
er, thus setting the output voltage to
the desired value.
Applications Information
External Capacitors – Selection
The FAN2558/FAN2559 gives the user the
fl
exibility to uti-
lize a wide variety of capacitors compared to other LDOs.
An innovative design approach offers signi
fi
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,
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
fi
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
fi
xed-voltage con
fi
guration, connecting a capacitor
between the bypass pin and ground can signi
fi
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
fi
lm types are recommended for their
low leakage characteristics. Cost-sensitive applications not
concerned with noise can omit this capacitor.
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