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參數(shù)資料
| 型號： | FS8853-18PI |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 300mA LDO Linear Regulator |
| 中文描述： | 300mA的LDO線性穩(wěn)壓器 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 661K |
| 代理商： | FS8853-18PI |
FS8853
300mA LDO Linear Regulator
Fortune Semiconductor Co.
http://www.fsc.com.tw
TEL
: +886-2-2809-4742
FAX: +886-2-2809-4874
9/13
TD-0405006 Rev. 1.5
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The FS8853 is a low-dropout linear regulator. The
device provides preset 2.5V and 3.3V output
voltages for output current up to 300mA. Other
mask options for special output voltages from 1.3V
to 4.5V with 100mV increment are also available.
As illustrated in function block diagram, it consists
of a 1.25V reference, error amplifier, P-channel
pass transistor and an internal feedback voltage
divider.
The 1.25V bandgap reference is connected to the
error amplifier, which compares this reference with
the feedback voltage and amplifies the voltage
difference. If the feedback voltage is lower than the
reference voltage, the pass-transistor gate is
pulled lower, which allows more current to pass to
the output pin and increases the output voltage. If
the
feedback
voltage
pass-transistor gate is pulled up to decrease the
output voltage.
The output voltage is feedback through an internal
resistive divider connected to OUT pin. Additional
blocks include an output current limiter, thermal
sensor, and shutdown logic.
Internal P-channel Pass Transistor
The FS8853 features a P-channel MOSFET pass
transistor. Unlike similar designs using PNP pass
transistors, P-channel MOSFETs require no base
drive,
which
reduces
PNP-based regulators also waste considerable
current in dropout when the pass transistor
saturates, and use high base-drive currents under
large loads. The FS8853 does not suffer from
these problems and consumes only 65
μ
A (Typ.) of
ground pin current under heavy loads as well as in
dropout conditions.
Output Voltage Selection
The FS8853 output voltage is preset at an
internally trimmed voltage 2.5V, 3.3V or can be
mask-optioned from 1.3V to 4.5V with 100mV
increment. The first two digits of part number suffix
identify the output voltage (see
Ordering
Information
). For example, the FS8853-33CL has
a preset 3.3V output voltage.
is
too
high,
the
ground
pin
current.
Current Limit
The FS8853 also include a fold back current limiter.
It monitors and controls the pass transistor’s gate
voltage, estimates the output current, and limits the
output current within 0.6A.
Thermal Overload Protection
Thermal overload protection limits total power
dissipation in the FS8853. When the junction
temperature exceeds T
J
= +155°C
,
a thermal
sensor turns off the pass transistor, allowing the IC
to cool down. The thermal sensor turns the pass
transistor on again after the junction temperature
cools down by 20°C
,
resulting in a pulsed output
during continuous thermal overload conditions.
Thermal overload protection is designed to protect
the FS8853 in the event of fault conditions. For
continuous operation, the maximum operating
junction temperature rating of T
J
= +125°C
should
not be exceeded.
Operating Region and Power Dissipation
Maximum power dissipation of the FS8853
depends on the thermal resistance of the case and
circuit board, the temperature difference between
the die junction and ambient air, and the rate of
airflow. The power dissipation across the devices
is P = I
OUT
x (V
IN
-V
OUT
). The resulting maximum
power dissipation is:
(
)
A
J
MAX
P
θ
θ
+
Where (T
J
-T
A
) is the temperature difference
between the FS8853 die junction and the
surrounding air,
θ
JC
is the thermal resistance of the
package chosen, and
θ
CA
is the thermal resistance
through the printed circuit board, copper traces
and other materials to the surrounding air. For
better heat-sinking, the copper area should be
equally shared between the IN, OUT, and GND
pins.
If the FS8853 uses a SOT-89 package and this
(
)
JA
A
J
CA
JC
T
T
T
T
θ
=
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| FS8853-18PK | 300mA LDO Linear Regulator |
| FS8853-18PL | 300mA LDO Linear Regulator |
| FS8853-13PV | 300mA LDO Linear Regulator |
| FS8853-13PY | 300mA LDO Linear Regulator |
| FS8853-14CA | 300mA LDO Linear Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FS8853-18PK | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:300mA LDO Linear Regulator |
| FS8853-18PL | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:300mA LDO Linear Regulator |
| FS8853-18PV | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:300mA LDO Linear Regulator |
| FS8853-18PY | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:300mA LDO Linear Regulator |
| FS8853-19CA | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:300mA LDO Linear Regulator |
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