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PDF FS8860 Data sheet ( Hoja de datos )
| Número de pieza | FS8860 | |
| Descripción | 1.0A Adjustable & Fixed Voltage LDO Linear Regulator | |
| Fabricantes | Fortune Semiconductor | |
| Logotipo |  |
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REV. 2.2 FS8860-DS-22_EN
MAY 2014
Datasheet
FS8860
1.0A Adjustable & Fixed Voltage LDO Linear Regulator
1 page  
FS8860
7. Typical Application Circuit
VIN
10μF
FS8860-Gx
VREF
IADJ
VOUT
10μF
VOUT
= VREF
× (1 +
R2
R1
)
+
I
ADJ
× R2
VIN
10μF
FS8860-xxGx
10μF
VOUT
8. Functional Block Diagrams
IN
Current Limit
IN
Current Limit
Shutdown
Logic
1.25V
Bandgap
Reference
Thermal
Protection
R1
R2
Fixed Voltage Type
OUT
GND
Shutdown
Logic
1.25V
Bandgap
Reference
Thermal
Protection
Adjustable Voltage Type
OUT
ADJ
9. Absolute Maximum Ratings
Input voltage VIN to GND -------------------------------------------------------------------------------------------------- 9V
Output current limit, I(LIMIT) --------------------------------------------------------------------------------------------- 1.3A
Continuous power dissipation ------------------------------------------------------------------------------ Internally Limited
Junction Temperature, TJ ----------------------------------------------------------------------------------------------- +155°C
Storage temperature range, TSTG --------------------------------------------------------------------- -55℃ to +150℃
Operating junction temperature range ---------------------------------------------------------------- -40℃ to +125℃
Lead temperature (soldering, 10sec) ------------------------------------------------------------------------------- 260℃
* Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the
device. These are stress ratings only, and function operation of the device at these or any other
conditions beyond those indicated under “recommended operating conditions” is not implied.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
Rev. 2.2
5/15
5 Page 
FS8860
12. Detail Description
The FS8860 is a low-dropout linear regulator. The device provides preset 1.8V and 3.3V output voltages for
output current up to 1.0A. Adjustable output voltage and other mask options for special output voltages are also
available. As illustrated in function block diagram, it consists of a 1.25V bandgap reference, an error amplifier, a
P-channel pass transistor and an internal feedback voltage divider (fixed voltage types).
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 is too high, the pass-transistor gate is pulled up to
decrease the output voltage.
The output voltage is feed back through an internal resistive divider (or external resistive divider for adjustable
output voltage type) connected to OUT pin. Additional blocks include an output current limiter, thermal sensor,
and shutdown logic.
Internal P-channel Pass Transistor
The FS8860 features a P-channel MOSFET pass transistor. Unlike similar designs using PNP pass transistors,
P-channel MOSFETs require no base drive, which reduces ground pin current. PNP-based regulators also
waste considerable current in dropout when the pass transistor saturates, and use high base-drive currents
under large loads. The FS8860 does not suffer from these problems and consumes only 65μA (Typ.) of ground
pin current under heavy loads as well as in dropout conditions.
Output Voltage Selection
For fixed voltage type of FS8860, the output voltage is preset at an internally trimmed voltage. The first two
digits of part number suffix identify the output voltage (see Ordering Information). For example, the
FS8860-33CJ has a preset 3.3V output voltage.
For adjustable voltage type of FS8860, the output voltage is set by comparing the feedback voltage at adjust
terminal to the internal bandgap reference voltage. The reference voltage VREF is 1.25V. The output voltage
is given by the equation:
VOUT=VREF*(1+R2/R1)+IADJ*R2
(see Typical Application Schematic)
Current Limit
The FS8860 also includes 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 1.3A.
Thermal Overload Protection
Thermal overload protection limits total power dissipation in the FS8860. When the junction temperature
exceeds TJ = +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.
Rev. 2.2
11/15
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet FS8860.PDF ] | |
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