500mA Linear Regulator FS8855 low-dropout linear regulator that o

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500mA Linear Regulator FS8855 low-dropout linear regulator that o

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FS8855
500mA Linear Regulator
FS8855 low-dropout linear regulator that operations input voltage range from +2.5V +9.0V delivers 500mA output current. high-accuracy output voltage preset internally trimmed voltage 2.5V 3.3V. Other output voltages mask-optioned from 1.3V 4.5V with 100mV increment, except FS8855-29Cx which 2.85V output voltage. FS8855 consists 1.25V bandgap reference, error amplifier, P-channel pass transistor. Other features include short-circuit protection thermal shutdown protection. FS8855 devices available TO-92, SOT-89 SOT-223 packages.
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
Features
dropout voltage 650mV 500mA (Typ.) ±35mV output voltage accuracy (VIN Preset 2.5V, 3.3V Mask options from 1.3V 4.5V Small output capacitor Output current limit Thermal overload shutdown protection TO-92, SOT-89 SOT-223 Package
Temperature Range CCommercial Standard Commercial Standard, Lead(Pb) Free Phosphorous(P) Free Package Output Voltage 1.3V 1.4V 1.5V 1.6V 1.7V 1.8V 1.9V 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
Applications
CD-ROM Drivers DVD-ROM Drivers Portable Consumer Equipment Radio Control Systems Wireless Communication Systems
Note Mask option output types available order only
Fortune Semiconductor
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FS8855
500mA Linear Regulator
Configurations
Part FS8855 -xxxD
TO-92
Part
SOT-89
FS8855 -xxxK
FS8855 xxxxxxxx
FS8855 -xxxE
(BOTTOM VIEW)
FS8855 -xxxF FS8855 -xxxW
FS8855 -xxxL
FS8855 -xxxI FS8855 -xxxY
SOT-223
Part FS8855 -xxxG
FS8855 -xxxH
FS8855 xxxxxxxx
FS8855 -xxxJ FS8855 -xxxX
Package Marking Information
EXFS8855-33CL
FS8855 33CLxxxx
xxxxDate Code
EXFS8855-33PL
FS8855 33PLxxxx
xxxxDate Code
Fortune Semiconductor
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FS8855
500mA Linear Regulator
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 Symbol Ground pin. Description
Regulator input pin.
Regulator output pin.
regulator input pin. Supply voltage range from 2.5V 9.0V. Bypass with capacitor GND. output voltage pin. Sources 500mA. Bypass with 3.3µF capacitor GND. provides reference voltages.
Functional Block Diagram
Current Limit
Shutdown Logic
Thermal Protection
1.25V Bandgap Reference
Fortune Semiconductor
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FS8855
500mA Linear Regulator
Typical Application Circuit
Absolute Maximum Ratings
Input voltage Output current limit, I(LIMIT) 0.8A Continuous power dissipation, 100°C) SOT-223 0.65W SOT-89 0.55W 0.55W TO-92 power dissipation values based condition that junction temperature ambient temperature difference 100°C. Junction Temperature, +155°C Storage temperature range, TSTG +150°C Operating junction temperature range +125°C Lead temperature (soldering, 10sec) 260°C
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.) Symbol VOUT Parameter Input Voltage VIN=VOUT+0.8V, IOUT=1mA, VIN7V Output Voltage VIN=VOUT+0.8V, IOUT=1mA, 7VVIN VIN>VOUT+0.8V, VIN7V VIN>VOUT+0.8V, 7VVIN9V Test Conditions VOUT0.035 VOUT0.042 VOUT=0V, VIN>VOUT+0.8V ILOAD=0mA 500mA, VIN=VOUT+0.8V IOUT=1mA VDROP VLINE VLOAD Dropout Voltage Line Regulation Load Regulation Output Noise Ripple Rejection Thermal Shutdown Temperature Thermal Shutdown Hysteresis Thermal Resistance 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 0.01 SOT-223 SOT-89 TO-92 0.02 VOUT VOUT VOUT+ 0.035 VOUT+ 0.042 Unit %/mA µVRMS °C/W °C/W °C/W
VOUT IMAX ILIMIT
Output Voltage Accuracy Maximum Load Current Current Limit Short-Circuit Current Ground Current
PSRR THYS
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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 AMBIENT TEMPERATURE GROUND CURRENT (µA)
OUTPUT VOLTAGE
100mA 250mA 500mA
INPUT VOLTAGE
*EXModel FS8855-33Cx
AMBIENT 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 (µA)
PSRR (db)
0.01 1000
FREQUENCY (KHz)
LOAD CURRENT (mA)
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FS8855
500mA Linear Regulator
OUTPUT VOLTAGE AMBIENT TEMPERATURE GROUND CURRENT (µA)
3.36
GROUND CURRENT INPUT VOLTAGE
OUTPUT VOLTAGE
3.34
3.32
3.30
3.28
3.26
AMBIENT TEMPERATURE
OUTPUT NOISE 1MHz (39uVRMS)
INPUT VOLTAGE
OUTPUT NOISE 1MHz (74uVRMS)
Iload =0mA LINE TRANSIENT (IOUT=0mA) LINE TRANSIENT (IOUT=10mA)
Iload =500mA
5.0V 4.0V
5.0V 4.0V
VOUT
VOUT
COUT 3.3µF 50mV/div Fortune Semiconductor +886-2-2809-4742 FAX: +886-2-2809-4874 7/13 TD-0405007
COUT 3.3µF 50mV/div Rev.
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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
VOUT
COUT 3.3µF 50mV/div LOAD TRANSIENT LOAD TRANSIENT
COUT 3.3µF 50mV/div
100mA IOUT IOUT
250mA 100mA
VOUT VOUT COUT 3.3µF 50mV/div LOAD TRANSIENT LOAD TRANSIENT COUT 3.3µF 50mV/div
500mA IOUT 250mA IOUT
500mA
VOUT COUT 3.3µF 50mV/div Fortune Semiconductor +886-2-2809-4742 FAX: +886-2-2809-4874
VOUT COUT 3.3µF 100mV/div 8/13 TD-0405007 Rev.
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FS8855
500mA Linear Regulator
Detail Description
FS8855 low-dropout linear regulator. device provides preset 2.5V 3.3V output voltages output current 500mA. Other mask options special output voltages from 1.3V 4.5V with 100mV increment also available. 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 voltage 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 decrease output voltage. output voltage feedback through internal resistive divider connected pin. 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 conditions. Output Voltage Selection FS8855 output voltage preset internally trimmed voltage 2.5V, 3.3V mask-optioned from 1.3V 4.5V with 100mV increment. first digits part number suffix identify output voltage (see Ordering Information). example, FS8855-33CL preset 3.3V output voltage. Current Limit
FS8855 also includes fold back current limiter. monitors controls pass transistor's gate voltage, estimates output current, limits output current within 0.8A. Thermal Overload Protection Thermal overload protection limits total power dissipation FS8855. When junction temperature exceeds +155°C, thermal sensor turns pass transistor, allowing cool down. thermal sensor turns pass transistor again after junction temperature cools down 20°C, resulting pulsed output during continuous thermal overload conditions. Thermal overload protection designed protect FS8855 event fault conditions. continuous operation, maximum operating junction temperature rating +125°C 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. better heat-sinking, copper area should equally shared between OUT, pins. FS8855 uses SOT-89 package this package mounted double sided printed circuit board with square inches copper allocated "heat spreading", resulting
9/13 TD-0405007 Rev.
Fortune Semiconductor
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+886-2-2809-4742 FAX: +886-2-2809-4874
FS8855
500mA Linear Regulator
180°C/W. Input-Output Voltage Based maximum operating junction temperature 125°C with ambient temperature 25°C, maximum power dissipation will 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
(125 0.555W
Thermal characteristics were measured using double sided board with square inches copper area connected "heat spreading".
Fortune Semiconductor
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+886-2-2809-4742 FAX: +886-2-2809-4874
10/13
TD-0405007
Rev.
FS8855
500mA Linear Regulator
Package Outline SOT-223
Fortune Semiconductor
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11/13
TD-0405007
Rev.
FS8855
500mA Linear Regulator
SOT-89
Fortune Semiconductor
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12/13
TD-0405007
Rev.
FS8855
500mA Linear Regulator
TO-92
Fortune Semiconductor
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13/13
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500mA Linear Regulator FS8855 low-dropout linear regulator that o

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