800mA Adjustable Fixed Voltage Linear Regulator FS8858 low-dropou

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800mA Adjustable Fixed Voltage Linear Regulator FS8858 low-dropou

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FS8858
800mA Adjustable Fixed Voltage Linear Regulator
FS8858 low-dropout linear regulator that operates input voltage range from +2.5V +7.0V delivers 800mA output current. FS8858 available types, fixed output voltage type adjustable output voltage type. fixed output voltage type preset internally trimmed voltage 1.8V, 2.5V, 3.3V. Other options 1.5V, 2.85V, 3.0V 3.6V available special order only. output voltage range adjustable type from 1.25V FS8858 consists 1.25V bandgap reference, error amplifier, P-channel pass transistor. Other features include short-circuit protection thermal shutdown protection. FS8858 devices available SOT-223 TO-252 packages.
Ordering Information
FS8858-xx Package
GSOT-223 1.IN 2.GND 3.OUT HSOT-223 1.GND 2.IN 3.OUT JSOT-223 1.GND 2.OUT 3.IN PTO-252 1.IN 2.GND 3.OUT RTO-252 1.GND 2.OUT 3.IN Note adjustable voltage types, replaced with Temperature Range CCommercial Standard Output Voltage (For fixed voltage types only. adjustable voltage types, these digits eliminated.) 1.5V 1.8V 2.5V 2.85V 3.0V 3.3V 3.6V Default Adjustable Output Note: output voltages other than preset values available order only.
Features
dropout voltage 600mV 800mA typ. Adjustable output voltage (FS8858-Cx) fixed output voltage (FS8858-xxCx) preset 1.8V, 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-223 TO-252 Packages
Part FS8858 -xxCG
Configurations
SOT-223
GND/ADJ (TAP) (TAP) (TAP)
TO-252 FS8858 xxCxxxxx
FS8858 GND/ADJ -xxCH FS8858 GND/ADJ -xxCJ
Applications
Active SCSI Terminators High Efficiency Linear Regulators Monitor Microprocessors Voltage Micro-Controllers Post Regulator Switching Power
Part FS8858 -xxCP
GND/ADJ (TAP) (TAP)
FS8858 xxCxxxxx
FS8858 GND/ADJ -xxCR
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TD-0403001
FS8858
800mA Adjustable Fixed Voltage Linear Regulator
Package Marking Information
EXFS8858-33CJ
FS8858 33CJxxxx xxxxDate Code
EXFS8858-CJADJ type
FS8858 CJxxxx xxxxDate Code
Description
Part FS8858-xxCG FS8858-xxCH FS8858-xxCJ FS8858-xxCP FS8858-xxCR Symbol GND/ADJ Description Ground adjust terminal pin. Regulator input pin. Regulator output pin.
regulator input pin. Supply voltage range from 2.5V 7.0V. Bypass with 10µF capacitor GND.
output voltage pin. Sources 800mA. Bypass with 10µF capacitor GND. provides reference voltages. provides VREF=1.25VTyp.for adjustable output voltage.
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FS8858
800mA Adjustable Fixed Voltage Linear Regulator
Typical Application Circuit
10µF FS8858-Cx 10µF
VOUT VREF IADJ
VOUT VREF
FS8858-xxCx
10µF 10µF
VOUT
Functional Block Diagrams
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
Absolute Maximum Ratings
Input voltage Output current limit, I(LIMIT) 1.1A Continuous power dissipation, SOT-223 1.80W TO-252 2.00W Storage temperature range, TSTG +150 Operating junction temperature range +125 Lead temperature (soldering, 10sec)
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FS8858
800mA Adjustable Fixed Voltage Linear Regulator
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.
Electrical Characteristics
(CIN=10µF, COUT=10µF, TA=25, unless otherwise noted.) Symbol VOUT Parameter Input Voltage CONDITIONS VOUT0.035 VOUT 1.25 VOUT+ 0.035 1.30 Unit 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 SOT-223 TO-252
4/11
VOUT IMAX ILIMIT IADJ VDROP
Fixed Voltage Type VIN=VOUT+0.8V, IOUT=1mA Output Voltage Adjustable Voltage Type 1.20 VIN=VOUT+1.2V, IOUT=1mA VIN>VOUT+0.8V, (Fixed Voltage Type) Output Voltage Accuracy VIN>VOUT+1.2V, (Adjustable Voltage Type) Maximum Output Current Current Limit Short-Circuit Current Ground Current Current Dropout Voltage (Fixed Output Voltage Version)
%/mA %/mA µVRMS
0.03 0.15
VLINE
Line Regulation
VLOAD
Load Regulation Output Noise PSRR Thermal Shutdown Temperature Thermal Shutdown Hysteresis Thermal Resistance
PSRR THYS
TD-0403001
°C/W °C/W
Rev.
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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 AMBIENT 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
AMBIENT TEMPERATURE
DROPOUT VOLTAGE LOAD CURRENT DROPOUT VOLTAGE (mV)
LOAD CURRENT
1000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
POWER SUPPLY REJECTION RATIO FREQUENCY
-100
GROUND CURRENT LOAD CURRENT
GROUND CURRENT (uA)
PSRR (db)
0.01 1000
LOAD CURRENT (mA)
FREQUENCY (KHz)
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FS8858
800mA Adjustable Fixed Voltage Linear Regulator
OUTPUT VOLTAGE AMBIENT TEMPERATURE
3.36
CURRENT INPUT VOLTAGE
CURRENT (uA)
OUTPUT VOLTAGE
3.34 3.32 3.28 3.26 3.24 3.22
INPUT VOLTAGE
AMBIENT TEMPERATURE
CURRENT LOAD CURRENT
54.00
CURRENT AMBIENT TEMPERATURE CURRENT (uA)
53.00 52.00 51.00 50.00 49.00 48.00 47.00 46.00 45.00 44.00 43.00
CURRENT (uA)
LOAD CURRENT (mA)
AMBIENT TEMPERATURE
Vref AMBIENT TEMPERATURE
1.265
1.26
1.255
Vref
1.25
1.245
1.24
ILoad=0
1.235
AMBIENT TEMPERATURE
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FS8858
800mA Adjustable Fixed Voltage Linear Regulator
Line Transient (IOUT=250mA)
5.0V 4.0V
Line Transient (IOUT=50mA)
5.0V 4.0V
VOUT
COUT 10µF 50mV/div
VOUT
COUT 10µF 50mV/div
Line Transient (IOUT=100mA)
5.0V 4.0V
Line Transient (IOUT=0mA)
5.0V 4.0V
VOUT
COUT 10µF 50mV/div
VOUT
COUT 10µF 10mV/div
Load Transient
500mA IOUT IOUT
Load Transient
800mA
VOUT
10µF COUT 10µF 100mV/div
VOUT
10µF COUT 10µF 100mV/div
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FS8858
800mA Adjustable Fixed Voltage Linear Regulator
Detail Description
FS8858 low-dropout linear regulator. device provides preset 1.8V, 2.5V 3.3V output voltages output current 800mA. Adjustable output voltage other mask options special output voltages also available. illustrated function block diagram, consists 1.25V bandgap 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 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 feed back through internal resistive divider external resistive divider adjustable output voltage type) connected pin. 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 conditions. Output Voltage Selection fixed voltage type FS8858, output voltage preset internally trimmed voltage. first digits part number suffix identify output voltage (see Ordering Information). example, FS8858-33CJ preset 3.3V output voltage.
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adjustable voltage type FS8858, output voltage comparing feedback voltage adjust terminal internal bandgap reference voltage. reference voltage VREF 1.25V. output voltage given equation: VOUT=VREF*(1+R2/R1)+IADJ*R2 (see Typical Application Schematic) Current Limit FS8858 also includes fold back current limiter. monitors controls pass transistor's gate voltage, estimates output current, limits output current within 1.1A. Thermal Overload Protection Thermal overload protection limits total power dissipation FS8858. When junction temperature exceeds +170°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 FS8858 event fault conditions. continuous operation, absolute maximum junction temperature rating +170°C 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
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. FS8858 uses SOT-223 package this package mounted double sided printed circuit board with square inches copper allocated "heat spreading", resulting °C/W. Based maximum junction temperature with ambient 25°C, maximum power dissipation will 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 output current. VDROPOUT VIN-VOUT RDS(ON) IOUT
PMAX
(170 1.8125W
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FS8858
800mA Adjustable Fixed Voltage Linear Regulator
Package Outline SOT-223
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FS8858
800mA Adjustable Fixed Voltage Linear Regulator
TO-252
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11/11
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800mA Adjustable Fixed Voltage Linear Regulator FS8858 low-dropou

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