FS8856 550mA Linear Regulator Ordering Information FS8856-xx

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FS8856 550mA Linear Regulator Ordering Information FS8856-xx

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FS8856 550mA Linear Regulator
Ordering Information
FS8856-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
FS8856 low-dropout linear regulator operation from +2.5V +6.5V input range delivers 550mA load current. high-accuracy output voltage preset internally trimmed voltage 2.5V, 3.3V mask option from 1.3V 5.0V with 100mV increment. FS8856-19Cx, output 1.85V. FS8856-29Cx, output 2.85V. FS8856 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 4.6V 4.7V 4.8V 4.9V 5.0V
Features
dropout voltage 350mV 300mA (Typ.) ±35mV output voltage accuracy Preset 2.5V, 3.3V Mask option from 1.3V 5.0V 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 FS8856 -xxCD
FS8856 550mA Linear Regulator
TO-92
Part
SOT-89 FS8856 xxCxxxxx
FS8856 -xxCE
FS8856 -xxCK
(BOTTOM VIEW)
FS8856 -xxCF FS8856 -xxCW
FS8856 -xxCL
FS8856 -xxCI FS8856 -xxCY
SOT-223
Part FS8856 -xxCG
FS8856 -xxCH
FS8856 xxCxxxxx
FS8856 -xxCJ FS8856 -xxCX
Package Marking Information SOT-23 EXFS8856-33CC
Other Package EXFS8856-33CL
FS8856 33CLxxxx xxxxDate Code
PointDate CodeMonth Bottom PointDate CodeDay
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Description
Part FS8856-xxCD FS8856-xxCE FS8856-xxCF FS8856-xxCW FS8856-xxCG FS8856-xxCH FS8856-xxCJ FS8856-xxCX FS8856-xxCK FS8856-xxCL FS8856-xxCI FS8856-xxCY
FS8856 550mA Linear Regulator
Symbol Ground.
Description
Regulator input.
Regulator output.
regulator input. Supply voltage range from 2.5V 6.5V. Bypass with capacitor GND. output voltage. Sources 550mA. 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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FS8856 550mA Linear Regulator
Typical Application Schematic
FS8856
Absolute Maximum Ratings
Input voltage Output current limit, I(LIMIT) 0.8A Continuous power dissipation, SOT-223 1.80W SOT-89 0.95W 0.65W TO-92 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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FS8856 550mA Linear Regulator
Electrical Characteristics
(TA=25, unless otherwise noted.)
PARAMETER
Input Voltage Output Voltage Output Voltage Accuracy Maximum Load Current Current Limit Short-Circuit Current Ground Current Dropout Voltage Line Regulation Load Regulation PSRR Thermal Shutdown Temperature Thermal Shutdown Hysteresis SOT-223 Thermal Resistance SOT-89 TO-92
CONDITIONS
VIN=VOUT+0.9V, IOUT=1mA VIN>VOUT+0.9V, VIN6.5V
VOUT0.035
VOUT
UNITS
VOUT+ 0.035 %/mA 0.03
VOUT=0V, VIN>VOUT+0.9V ILOAD=0mA 550mA, VIN=VOUT+0.9V IOUT=100mA IOUT=300mA IOUT=550mA VOUT+0.9V<VIN<6.5V, ILOAD=1mA IOUT=0mA 550mA F=10KHz, COUT=3.3µF
0.02
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FS8856 550mA 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 550mA
INPUT VOLTAGE *EXModel FS8856-33Cx
TEMPERATURE
DROPOUT VOLTAGE LOAD CURRENT
1.40
LOAD CURRENT
DROPOUT VOLTAGE
1.30
0.15 0.25 0.35 0.45 0.55
1.20
1.10
1.00
0.90
0.80
LOAD CURRENT
LOAD CURRENT (mA)
POWER SUPPLY REJECTION RATIO FREQUENCY
-100
CURRENT LOAD CURRENT
GROUND CURRENT (uA)
PSRR (dB)
0.01 1000
FREQUENCY (KHz)
LOAD CURRENT (mA)
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FS8856 550mA Linear Regulator
OUTPUT VOLTAGE TEMPERATURE
3.36
GROUND CURRENT INPUT VOLTAGE
GROUND CURRENT (uA)
OUTPUT VOLTAGE
3.34
3.32
3.28
3.26
TEMPERATURE
INPUT VOLTAGE
LINE TRANSIENT (IOUT=0mA)
LINE TRANSIENT (IOUT=10mA)
5.0V 4.0V
5.0V 4.0V
VOUT
COUT 3.3uF 50mV/div
VOUT
COUT 3.3uF 50mV/div
LINE TRANSIENT (IOUT=250mA) 5.0V 4.0V
LINE TRANSIENT (IOUT=550mA) 5.0V 4.0V
VOUT
COUT 3.3uF 50mV/div
VOUT
COUT 3.3uF 50mV/div
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LOAD TRANSIENT
FS8856 550mA Linear Regulator
LOAD TRANSIENT
100mA IOUT IOUT
250mA 100mA
VOUT
COUT 3.3uF 50mV/div LOAD TRANSIENT
VOUT
COUT 3.3uF 50mV/div LOAD TRANSIENT
550mA IOUT 250mA IOUT
500mA
VOUT
COUT 3.3uF 50mV/div
VOUT
COUT 3.3uF 100mV/div
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Detail Description
FS8856 550mA Linear Regulator
Current Limit FS8856 low-dropout linear regulator. supplies pre-selected 2.5V, 3.3V output mask option from 1.3V 5.0V with 100mV increment load currents 550mA. 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 FS8856 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. FS8856 does suffer from these problems consumes only 65µA (Typ.) ground current under heavy loads well dropout. Output Voltage Selection FS8856 output voltage preset internally trimmed voltage 2.5V, 3.3V mask option from 1.3V 5.0V with 100mV increment. first two-digit part number suffix identifies output voltage (see Ordering Information). example, FS8856-33CL preset 3.3V output voltage. FS8856 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 FS8856. 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 FS8856 event fault conditions. continual operation, absolute maximum junction temperature rating +170 should exceeded. Operating Region Power Dissipation Maximum power dissipation FS8856 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 FS8856 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. FS8856 uses SOT-89 package, When this
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FS8856 550mA 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. FS8856 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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FS8856 550mA Linear Regulator
Package Information
SOT-89
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FS8856 550mA Linear Regulator Ordering Information FS8856-xx

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