FS8858 800mA Adjustable Fixed Voltage Linear Regulator Ordering Inform
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FS8858 800mA Adjustable Fixed Voltage Linear Regulator Ordering Information
FS8858-xx
Package CSOT-23 GSOT-223 HSOT-223 JSOT-223 XSOT-223 KSOT-89 LSOT-89 ISOT-89 YSOT-89 MTO-220 NTO-220 OTO-220 PTO-252 QTO-252 RTO-252 1.GND 1.IN 1.GND 1.GND 1.OUT 1.IN 1.GND 1.OUT 1.GND 1.IN 1.GND 1.GND 1.IN 1.GND 1.GND 2.OUT 2.GND 2.IN 2.OUT 2.GND 2.GND 2.IN 2.GND 2.OUT 2.GND 2.IN 2.OUT 2.GND 2.IN 2.OUT 3.IN 3.OUT 3.OUT 3.IN 3.IN 3.OUT 3.OUT 3.IN 3.IN 3.OUT 3.OUT 3.IN 3.OUT 3.OUT 3.IN
FS8858 low-dropout linear regulator that operates input voltage from +2.5V +7.0V delivers 0.8A load current. FS8858 available types, either fixed adjustable output voltage. output voltage fixed types preset internally trimmed voltage 2.5V, 3.3V made with options range from 1.3V 4.5V 100mV increments. FS8858 -19Cx FS8858-29Cx exceptions, which have output voltage 1.85V 2.85V respectively. output range adjustable types from 1.25V FS8858 consists 1.25V reference, error amplifier, P-channel pass transistor allows 65µA (Typ.) ground current. Other features include short-circuit protection thermal shutdown protection.
Note adjustable voltage types, replaced with Temperature Range CCommercial Standard Output Voltage (Fixed voltage types only) 1.3V 2.4V 3.5V 1.4V 2.5V 3.6V 1.5V 2.6V 3.7V 1.6V 2.7V 3.8V 1.7V 2.8V 3.9V 1.8V 2.85V 4.0V 1.85V 3.0V 4.1V 2.0V 3.1V 4.2V 2.1V 3.2V 4.3V 2.2V 3.3V 4.4V 2.3V 3.4V 4.5V
Features
dropout voltage 60mV 100mA 600mV 800mA typ. Adjustable output voltage (FS8858-Cx) fixed output voltage (FS8858-xxCx) preset 2.5V, 3.3V High output voltage accuracy Fixed output voltage ±35mV Adjustable output voltage: ±50mV Small output capacitor Output current limit Thermal overload shutdown protection SOT-23, SOT-223, SOT-89, TO-220 TO-252 Package
output voltages other than preset value available order
Applications
Power Management Notebook Player Motherboard Clock Supplies Battery Chargers Post Regulator Switching Power
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FS8858 800mA Adjustable Fixed Voltage Linear Regulator
SOT-23
Part FS8858 -xxCC
8xxx
Part FS8858 -xxCP
TO-252
FS8858 xxCxxxxx
FS8858 -xxCQ
Part FS8858 -xxCG
SOT-223
FS8858 -xxCR
FS8858 -xxCH
FS8858 xxCxxxxx
FS8858 -xxCJ FS8858 -xxCX
Part
SOT-89
FS8858 -xxCK FS8858 -xxCL
FS8858 xxCxxxxx
TO-220
Part FS8858 -xxCM
FS8858 -xxCI FS8858 -xxCY
FS8858 -xxCN
FS8858 xxCxxxxx
FS8858 -xxCO
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FS8858 800mA Adjustable Fixed Voltage Linear Regulator
Package Marking Information SOT-23 Other Packages EXFS8858-33CJ
FS8858 33CJxxxx xxxxDate Code
EXFS8858-33CC
PointDate CodeMonth Bottom PointDate CodeDay
EXFS8858-CCADJEXFS8858-CJADJ
8ACC
PointDate CodeMonth Bottom PointDate CodeDay
FS8858 CJxxxx xxxxDate Code
Description
Part FS8858-xxCC FS8858-xxCG FS8858-xxCH FS8858-xxCJ FS8858-xxCX FS8858-xxCK FS8858-xxCL FS8858-xxCI FS8858-xxCY FS8858-xxCM FS8858-xxCN FS8858-xxCO FS8858-xxCP FS8858-xxCQ FS8858-xxCR Symbol GND/ADJ Description Ground output Adjustable output.
Regulator input.
Regulator output.
regulator input. Supply voltage range from 2.5V 7.0V. Bypass with 10µF capacitor GND. output voltage. Sources 800mA. Bypass with 10µF capacitor GND. provides reference voltages. This also functions heat sink. Solder large circuit-board ground plane maximize power dissipation. provides VREF=1.25VTyp.for adjustable VOUT.
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FS8858 800mA Adjustable Fixed Voltage Linear Regulator
Typical Application Schematic
10uF FS8858-Cx
VOUT VREF IADJ
10uF
VOUT VREF
FS8858-xxCx
10uF 10uF
VOUT
Function Block Diagram
Current Limit
Current Limit
Shutdown Logic
Thermal Protection
Shutdown Logic
Thermal Protection
1.25V Bandgap Reference
1.25V Bandgap Reference
Fixed Voltage Type Adjustable Voltage Type
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FS8858 800mA Adjustable Fixed Voltage Linear Regulator
Absolute Maximum Ratings
Input voltage -Output current limit, I(LIMIT) 1.1A Continuous power dissipation, SOT-23 0.45W SOT-223 1.80W SOT-89 0.95W TO-220 2.40W TO-252 2.00W Storage temperature range, TSTG +150 Operating ambient temperature range Operating junction temperature range +125 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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FS8858 800mA Adjustable Fixed Voltage Linear Regulator
Electrical Characteristics
(CIN=10µF, COUT=10µF, TA=25, unless otherwise noted.)
PARAMETER
Input Voltage Output Voltage
CONDITIONS
Fixed Voltage Type VIN=VOUT+0.8V, IOUT=1mA Adjustable Voltage Type VIN=VOUT+1.2V, IOUT=1mA VIN>VOUT+0.8V, VIN7V (Fixed Voltage Type) VIN>VOUT+1.2V, VIN7V (Adjustable Voltage Type)
VOUT0.035 1.20
VOUT 1.25
UNITS
VOUT+ 0.035 1.30 %/mA %/mA µVRMS
Output Voltage Accuracy Maximum Load Current Current Limit Short-Circuit Current Ground Current Current Dropout Voltage (Fixed Voltage Type)
VIN>VOUT+0.8V (Fixed Voltage Type) VOUT=0V VIN>VOUT+1.2V (Adjustable Voltage Type) ILOAD=0mA 800mA, VIN=VOUT+0.8V ILOAD=0mA 800mA, VIN=VOUT+1.2V IOUT=100mA IOUT=400mA IOUT=800mA VOUT+0.8V<VIN<7V, ILOAD=1mA (Fixed Voltage Type) VOUT+1.2V<VIN<7V, ILOAD=1mA (Adjustable Voltage Type) IOUT=0mA 800mA (Fixed Voltage Type) IOUT=0mA 800mA (Adjustable Voltage Type) F=1Hz 10KHz, COUT=10µF F=10KHz, COUT=10µF
0.02
0.03 0.15
Line Regulation
Load Regulation Output Noise PSRR Thermal Shutdown Temperature Thermal Shutdown Hysteresis
SOT-23 SOT-223 Thermal Resistance SOT-89 TO-252 TO-220
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FS8858 800mA Adjustable Fixed Voltage Linear Regulator
Typical Operating Characteristics
(CIN=10µF, COUT=10µF, TA=+25, unless otherwise noted.)
OUTPUT VOLTAGE INPUT VOLTAGE
GROUND CURRENT TEMPERATURE
70.00
OUTPUT VOLTAGE
GROUND CURRENT (uA)
60.00 50.00 40.00 30.00 20.00 10.00 0.00
200mA 500mA
INPUT VOLTAGE
*EXModel FS8858-33Cx ILOAD
DROPOUT VOLTAGE LOAD CURRENT
TEMPERATURE
LOAD CURRENT
DROPOUT VOLTAGE (mV)
1000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
POWER SUPPLY REJECTION RATIO FREQUENCY
GROUND CURRENT (uA)
-100
GROUND CURRENT LOAD CURRENT
PSRR (db)
0.01 1000
LOAD CURRENT (mA)
FREQUENCY (KHz)
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FS8858 800mA Adjustable Fixed Voltage Linear Regulator
CURRENT INPUT VOLTAGE
OUTPUT VOLTAGE TEMPERATURE
3.36
CURRENT (uA)
OUTPUT VOLTAGE
3.34 3.32 3.28 3.26 3.24 3.22
INPUT VOLTAGE
TEMPERATURE
CURRENT LOAD CURRENT
54.00
CURRENT TEMPERATURE
CURRENT (uA)
CURRENT (uA)
53.00 52.00 51.00 50.00 49.00 48.00 47.00 46.00 45.00 44.00 43.00
LOAD CURRENT (mA)
TEMPERATURE
Vref TEMPERATURE
1.265
1.26
1.255
Vref
1.25
1.245
1.24
1.235
ILoad=0
TEMPERATURE
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FS8858 800mA Adjustable Fixed Voltage Linear Regulator
Line Transient (IOUT=50mA)
5.0V 4.0V
Line Transient (IOUT=250mA)
5.0V 4.0V
VOUT
COUT 10uF 50mV/div
VOUT
COUT 10uF 50mV/div
Line Transient (IOUT=100mA)
5.0V 4.0V
Line Transient (IOUT=0mA)
5.0V 4.0V
VOUT
COUT 10uF 50mV/div
VOUT
COUT 10uF 10mV/div
Load Transient
500mA IOUT IOUT
Load Transient
800mA
VOUT
10uF COUT 10uF 100mV/div
VOUT
10uF COUT 10uF 100mV/div
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Detail Description
FS8858 800mA Adjustable Fixed Voltage Linear Regulator
FS8858 low-dropout linear regulator. supplies pre-selected 3.3V, 2.5V output made with options output range from 1.3V 4.5V with 100mV increment load currents 800mA. illustrated function block diagram, consists 1.25V reference, error amplifier, p-channel pass transistor internal feedback voltage divider (fixed voltage types). 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 feed back through internal resistive divider external resistive divider adjustable output voltage version) connected OUT. Additional blocks include output current limiter, thermal sensor, shutdown logic. Internal P-channel Pass Transistor FS8858 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. FS8858 does suffer from these problems consumes only 65µA (Typ.) ground current under heavy loads well dropout. Output Voltage Selection fixed voltage type's FS8858, output voltage preset internally trimmed voltage, mask option from 1.3V 4.5V. first two-digit part number suffix identifies output voltage (see Ordering Information). example, FS8858-33CJ
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preset 3.3V output voltage. adjustable voltage type's FS8858, output comparing output voltage internally generated reference voltage. VREF available externally 1.25V between VOUT ADJ. output voltage given equation: VOUT=VREF*(1+R2/R1)+IADJ*R2 (see Typical Application Schematic) Current Limit FS8858 also include fold back current limiter. monitors controls pass transistor's gate voltage, estimating output current limiting 1.1A. Thermal Overload Protection Thermal overload protection limits total power dissipation FS8858. 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 FS8858 event fault conditions. continual operation, absolute maximum junction temperature rating +170 should exceeded. Operating Region Power Dissipation Maximum power dissipation FS8858 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 FS8858 junction surrounding air, thermal resistance
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FS8858 800mA Adjustable Fixed Voltage Linear Regulator
Thermal characteristics were measured using double-sided board with square inches copper area connected pins "heat 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. FS8858 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
package chosen, thermal resistance through printed circuit board, copper traces other materials surrounding air. best heatsinking, copper area should equally shared between OUT, pins. FS8858 uses SOT-223 package, When this 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
PMAX
(170 1.8125W
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FS8858 800mA Adjustable Fixed Voltage Linear Regulator
Package Information SOT-23
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FS8858 800mA Adjustable Fixed Voltage Linear Regulator
SOT-89
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FS8858 800mA Adjustable Fixed Voltage Linear Regulator
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