FS8855 500mA Linear Regulator Ordering Information FS8855-xx

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FS8855 500mA Linear Regulator Ordering Information FS8855-xx

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FS8855 500mA Linear Regulator
Ordering Information
FS8855-xx
Package DTO-92 ETO-92 FTO-92 WTO-92 GSOT-223 HSOT-223 JSOT-223 XSOT-223 KSOT-89 LSOT-89 ISOT-89 YSOT-89 1.IN 1.GND 1.OUT 1.GND 1.IN 1.GND 1.GND 1.OUT 1.IN 1.GND 1.OUT 1.GND 2.GND 2.IN 2.GND 2.OUT 2.GND 2.IN 2.OUT 2.GND 2.GND 2.IN 2.GND 2.OUT 3.OUT 3.OUT 3.IN 3.IN 3.OUT 3.OUT 3.IN 3.IN 3.OUT 3.OUT 3.IN 3.IN
FS8855 low-dropout linear regulator operation from +2.5V +9.0V input range delivers 500mA load current. high-accuracy output voltage preset internally trimmed voltage 2.5V, 3.3V mask option from 1.3V 4.5V with 100mV increment. FS8855-19Cx, output 1.85V. FS8855-29Cx, output 2.85V. FS8855 consist 1.25V reference compare amplifier, P-channel pass transistor allows 65µA (Typ.) ground current. Other features include short-circuit protection, thermal shutdown protection.
Temperature Range CCommercial Standard Output Voltage 1.3V 1.4V 1.5V 1.6V 1.7V 1.8V 1.85V 2.0V 2.1V 2.2V 2.3V 2.4V 2.5V 2.6V 2.7V 2.8V 2.85V 3.0V 3.1V 3.2V 3.3V 3.4V 3.5V 3.6V 3.7V 3.8V 3.9V 4.0V 4.1V 4.2V 4.3V 4.4V 4.5V
Features
dropout voltage 600mV 500mA (Typ.) ±35mV output voltage accuracy (VIN Preset 2.5V, 3.3V Mask option from 1.3V 4.5V Small output capacitor Output current limit Thermal overload shutdown protection TO-92, SOT-89 SOT-223 Package
Applications
CD-ROM Drivers DVD-ROM Drivers Portable Consumer Equipment Radio Control Systems Wireless Communication Systems
Note Mask option output types available order
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Part FS8855 -xxCD
FS8855 500mA Linear Regulator
TO-92
Part
SOT-89 FS8855 xxCxxxxx
FS8855 -xxCE
FS8855 -xxCK
(BOTTOM VIEW)
FS8855 -xxCF FS8855 -xxCW
FS8855 -xxCL
FS8855 -xxCI FS8855 -xxCY
SOT-223
Part FS8855 -xxCG
FS8855 -xxCH
FS8855 xxCxxxxx
FS8855 -xxCJ FS8855 -xxCX
Package Marking Information SOT-23 EXFS8855-33CC
Other Package EXFS8855-33CL
FS8855 33CLxxxx xxxxDate Code
PointDate CodeMonth Bottom PointDate CodeDay
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Description
Part FS8855-xxCD FS8855-xxCE FS8855-xxCF FS8855-xxCW FS8855-xxCG FS8855-xxCH FS8855-xxCJ FS8855-xxCX FS8855-xxCK FS8855-xxCL FS8855-xxCI FS8855-xxCY
FS8855 500mA Linear Regulator
Symbol Ground.
Description
Regulator input.
Regulator output.
regulator input. Supply voltage range from 2.5V 9.0V. Bypass with capacitor GND. output voltage. Sources 500mA. Bypass with 3.3µF capacitor GND. provides reference voltages. This also functions heat sink. Solder large circuit-board ground plane maximize power dissipation.
Function Block Diagram
Current Limit
Shutdown Logic
Thermal Protection
1.25V Bandgap Reference
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FS8855 500mA Linear Regulator
Typical Application Schematic
Absolute Maximum Ratings
Input voltage Output current limit, I(LIMIT) 0.8A Continuous power dissipation, SOT-223 1.80W SOT-89 0.95W TO-92 0.65W Storage temperature range, TSTG +150 Operating junction temperature range +125 Operating ambient temperature range Lead temperature (soldering, 10sec)
Stresses beyond those listed under "absolute maximum ratings" cause permanent damage device. These stress ratings only, function operation device these other conditions beyond those indicated under "recommended operating conditions" implied. Exposure absolute-maximum-rated conditions extended periods affect device reliability.
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FS8855 500mA Linear Regulator
Electrical Characteristics
(TA=25, unless otherwise noted.)
PARAMETER
Input Voltage
CONDITIONS
VIN=VOUT+0.8V, IOUT=1mA, VIN7V
UNITS
%/mA µVRMS 0.02
Output Voltage VIN=VOUT+0.8V, IOUT=1mA, 7VVIN9V Output Voltage Accuracy Maximum Load Current Current Limit Short-Circuit Current Ground Current Dropout Voltage Line Regulation Load Regulation Output Noise PSRR Thermal Shutdown Temperature Thermal Shutdown Hysteresis SOT-223 Thermal Resistance SOT-89 TO-92 VOUT=0V, VIN>VOUT+0.8V ILOAD=0mA 500mA, VIN=VOUT+0.8V IOUT=1mA IOUT=100mA IOUT=500mA VOUT+0.8V<VIN<9V, ILOAD=1mA IOUT=0mA 500mA F=1Hz 10KHz, COUT=3.3µF F=10KHz, COUT=3.3µF VIN>VOUT+0.8V, VIN7V VIN>VOUT+0.8V, 7VVIN9V
VOUT+ VOUTVOUT 0.035 0.035 VOUTVOUT+ VOUT 0.042 0.042 0.01
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FS8855 500mA Linear Regulator
Typical Operating Characteristics
(CIN=1.0µF, COUT=3.3µF, TA=+25, unless otherwise noted.)
OUTPUT VOLTAGE INPUT VOLTAGE
GROUND CURRENT TEMPERATURE
OUTPUT VOLTAGE
GROUND CURRENT (uA)
100mA 250mA 500mA
INPUT VOLTAGE
*EXModel FS8855-33Cx
TEMPERATURE
DROPOUT VOLTAGE LOAD CURRENT
1.40
LOAD CURRENT
DROPOUT VOLTAGE (mV)
1.30
1.20
1.10
1.00
0.90
0.80
LOAD CURRENT (mA)
LOAD CURRENT (mA)
POWER SUPPLY REJECTION RATIO FREQUENCY
CURRENT LOAD CURRENT
GROUND CURRENT (uA)
PSRR (db)
0.01 1000
FREQUENCY (KHz)
LOAD CURRENT (mA)
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FS8855 500mA Linear Regulator
OUTPUT VOLTAGE TEMPERATURE
3.36
GROUND CURRENT INPUT VOLTAGE
GROUND CURRENT (uA)
OUTPUT VOLTAGE
3.34
3.32
3.30
3.28
3.26
TEMPERATURE
INPUT VOLTAGE
OUTPUT NOISE 1MHz (39uVRMS)
OUTPUT NOISE 1MHz (74uVRMS)
Iload =0mA LINE TRANSIENT (IOUT=0mA) 5.0V 4.0V LINE TRANSIENT (IOUT=10mA)
Iload =500mA
5.0V 4.0V
VOUT
VOUT
COUT 3.3uF 50mV/div FORTUNE SEMICONDUCTOR +886-2-2809-4742 FAX: +886-2-2809-4874 7/12 TD0305-0904
COUT 3.3uF 50mV/div VER.
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FS8855 500mA Linear Regulator
LINE TRANSIENT (IOUT=200mA) 5.0V 4.0V LINE TRANSIENT (IOUT=300mA) 5.0V 4.0V
VOUT COUT 3.3uF 50mV/div LOAD TRANSIENT
VOUT COUT 3.3uF 50mV/div LOAD TRANSIENT
100mA IOUT IOUT
250mA 100mA
VOUT VOUT COUT 3.3uF 50mV/div LOAD TRANSIENT LOAD TRANSIENT COUT 3.3uF 50mV/div
500mA IOUT 250mA IOUT
500mA
VOUT COUT 3.3uF 50mV/div
VOUT COUT 3.3uF 100mV/div
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Detail Description
FS8855 500mA Linear Regulator
Current Limit FS8855 low-dropout linear regulator. supplies pre-selected 2.5V, 3.3V output mask option from 1.3V 4.5V with 100mV increment load currents 500mA. illustrated function block diagram, consists 1.25V reference, error amplifier, p-channel pass transistor internal feedback voltage divider. 1.25V bandgap reference connected error amplifier, which compares this reference with feedback voltage amplifies difference. feedback voltage lower than reference voltage, pass-transistor gate pulled lower, which allows more current pass output increases output voltage. feedback voltage high, pass-transistor gate pulled allowing less current pass output. output voltage feedback through internal resistive divider connected OUT. Additional blocks include output current limiter, thermal sensor, shutdown logic. Internal P-channel Pass Transistor FS8855 features P-channel MOSFET pass transistor. Unlike similar designs using pass transistors, P-channel MOSFETs require base drive, which reduces ground current. PNP-based regulators also waste considerable current dropout when pass transistor saturates, high base-drive currents under large loads. FS8855 does suffer from these problems consumes only 65µA (Typ.) ground current under heavy loads well dropout. Output Voltage Selection FS8855 output voltage preset internally trimmed voltage 2.5V, 3.3V mask option from 1.3V 4.5V with 100mV increment. first two-digit part number suffix identifies output voltage (see Ordering Information). example, FS8855-33CL preset 3.3V output voltage. FS8855 also include fold back current limiter. monitors controls pass transistor's gate voltage, estimating output current limiting 0.8A. Thermal Overload Protection Thermal overload protection limits total power dissipation FS8855. When junction temperature exceeds +170, thermal sensor turns pass transistor, allowing cool. thermal sensor turns pass transistor again after junction temperature cools resulting pulsed output during continuous thermal overload conditions. Thermal overload protection designed protect FS8855 event fault conditions. continual operation, absolute maximum junction temperature rating +170 should exceeded. Operating Region Power Dissipation Maximum power dissipation FS8855 depends thermal resistance case circuit board, temperature difference between junction ambient air, rate airflow. power dissipation across devices IOUT (VIN-VOUT). resulting maximum power dissipation
PMAX
Where (TJ-TA) temperature difference between FS8855 junction surrounding air, thermal resistance package chosen, thermal resistance through printed circuit board, copper traces other materials surrounding air. best heatsinking, copper area should equally shared between OUT, pins. FS8855 uses SOT-89 package, When this
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FS8855 500mA Linear Regulator
package mounted double sided printed circuit board with square inches copper allocated "heat spreading", resulting Based maximum junction temperature with ambient maximum power dissipation will
spreading". Input-Output Voltage regulator's minimum input-output voltage differential, dropout voltage, determines lowest usable supply voltage. battery-powered systems, this will determine useful end-of-life battery voltage. FS8855 uses P-channel MOSFET pass transistor, dropout voltage function drain-to-source on-resistance (RDS(ON)) multiplied load current. VDROPOUT VIN-VOUT RDS(ON) IOUT
PMAX
(170 0.9667W
Thermal characteristics were measured using double sided board with square inches copper area connected pins "heat
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FS8855 500mA Linear Regulator
Package Information
SOT-89
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FS8855 500mA Linear Regulator
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FS8855 500mA Linear Regulator Ordering Information FS8855-xx

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