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| FS8853 300 mA LDO Linear Regulator General Description The FS8853 is a low-dropout linear regulator that operations in the input voltage range from +2.5V to +9.0V and delivers 300mA output current. The high-accuracy output voltage is preset at an internally trimmed voltage 2.5V or 3.3V. Other output voltages can be mask-optioned from 1.5V to 5.0V with 100mV increment, except FS8853-29Cx which has 2.85V output voltage. The FS8853 consists of a 1.25V bandgap reference, an error amplifier, and a P-channel pass transistor. Other features include short-circuit protection and thermal shutdown protection. The FS8853 devices are available in TO-92, SOT-89 and SOT-23 packages. Ordering Information FS8853-xx x x Package A : SOT-23 B : SOT-23 C : SOT-23 E : TO-92 L : SOT-89 I : SOT-89 1.IN 1.GND 1.GND 1.GND 1.GND 1.OUT Pin Out 2.GND 2.IN 2.OUT 2.IN 2.IN 2.GND 3.OUT 3.OUT 3.IN 3.OUT 3.OUT 3.IN Temperature Range C : Commercial Standard P : Commercial Standard, Lead(Pb) Free and Phosphorous(P) Free Package Output Voltage 15 : 1.5V 16 : 1.6V 17 : 1.7V 18 : 1.8V 19 : 1.9V 20 : 2.0V 21 : 2.1V 22 : 2.2V 23 : 2.3V 24 : 2.4V 25 : 2.5V 26 : 2.6V 27 : 2.7V 28 : 2.8V 29 : 2.85V 30 : 3.0V 31 : 3.1V 32 : 3.2V 33 : 3.3V 34 : 3.4V 35 : 3.5V 36 : 3.6V 37 : 3.7V 38 : 3.8V 39 : 3.9V 40 : 4.0V 41 : 4.1V 42 : 4.2V 43 : 4.3V 44 : 4.4V 45 : 4.5V 46 : 4.6V 47 : 4.7V 48 : 4.8V 49 : 4.9V 50 : 5.0V Features Low dropout voltage 400mV at 300mA (Typ.) Up to 35mV output voltage accuracy (VIN 7V) Preset at 2.5V, 3.3V Mask options from 1.5V to 5.0V Quiescent current 30A at 5V input (Typ.) Small output capacitor Output current limit Thermal overload shutdown protection TO-92, SOT-89 and SOT-23 Package Note: Mask option output types are available by order only Applications Battery Powered Equipment Palmtops Portable Cameras and Video Recorders Reference Voltage Sources Post Regulator for Switching Power Fortune Semiconductor Corp. http://www.fsc.com.tw TEL: +886-2-2809-4742 FAX: +886-2-2809-4874 1/13 FS8853-DS-20_EN Rev. 2.0 May, 2005 FS8853 Pin Configurations TO-92 SOT-89 Part No. Pin 1 Pin 2 Pin 3 FS8853 GND -xxxE 1 2 3 Part No. Pin 1 Pin 2 Pin 3 FS8853 GND -xxxL IN OUT IN FS8853 xxxxxxxx 1 2 3 IN OUT (BOTTOM VIEW) FS8853 OUT GND -xxxI Part No. Pin 1 Pin 2 Pin 3 FS8853 -xxxA IN GND OUT IN OUT IN SOT-23 3 ..... .... 3xxx W 1 2 FS8853 GND -xxxB FS8853 GND OUT -xxxC Package Marking Information SOT-23 EXFS8853-33CC ..... TO-92 & SOT-89 EXFS8853-33CL FS8853 33CLxxxx xxxxDate Code 333C ... W Top PointLot No. Bottom PointYear w : week, A~Z & A ~ Z EXFS8853-33PC ..... EXFS8853-33PL FS8853 33PLxxxx xxxxDate Code 333C ... . W Top PointLot No. Bottom PointYear w : week, A~Z & A ~ Z A dot after marking : Pb/P Free Fortune Semiconductor Corp. 2/13 Rev. 2.0 FS8853 Pin Description Part NO. FS8853-xxxA FS8853-xxxB FS8853-xxxC FS8853-xxxE FS8853-xxxL FS8853-xxxI Symbol GND IN OUT Description Ground pin that provides the reference for all voltages. Regulator input pin. Supply voltage can range from 2.5V to 9.0V. Bypass with a 1F capacitor to GND. Regulator output pin. Sources up to 300mA. Bypass with a 3.3F capacitor to GND. Functional Block Diagram IN Current Limit Shutdown Logic Thermal Protection OUT R1 1.25V Bandgap Reference R2 GND Typical Application Circuit Fortune Semiconductor Corp. 3/13 Rev. 2.0 FS8853 Absolute Maximum Ratings Input voltage VIN to GND ----------------------------------------------------------------------------------------------------10V Output current limit, I(LIMIT) ------------------------------------------------------------------------------------------------ 0.6A Continuous power dissipation, PD (T= TJ -TA = 100C) SOT-23 ---------------------------------------------------------------------------------------------------------------------------------------- 0.30W SOT-89 ---------------------------------------------------------------------------------------------------------------------------------------- 0.55W TO-92 ---------------------------------------------------------------------------------------------------------------------------------------- 0.55W * The power dissipation values are based on the condition that junction temperature TJ and ambient temperature TA difference is 100C. Junction Temperature, TJ ------------------------------------------------------------------------------------------------ +155C Storage temperature range, TSTG ---------------------------------------------------------------------- -55C to +150C Operating junction temperature range ----------------------------------------------------------------- -40C to +125C Lead temperature (soldering, 10sec) -------------------------------------------------------------------------------- 260C * Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and function operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. Fortune Semiconductor Corp. 4/13 Rev. 2.0 FS8853 Electrical Characteristics (TA=25C, unless otherwise noted.) Symbol Parameter Test Conditions Min Typ Max Unit VIN VOUT Input Voltage Output Voltage 2.5 VOUTVIN=VOUT+0.48V, IOUT=1mA, VIN7V 0.035 VIN=VOUT+0.48V, IOUT=1mA, 7VVIN VOUT0.042 9V VIN>VOUT+0.48V, VIN7V VIN>VOUT+0.48V, 7VVIN9V -35 -42 300 9.0 VOUT+ VOUT 0.035 VOUT+ VOUT 0.042 +35 +42 0.6 V V V mV mV mA A mA A mV mV mV %/V %/mA VRMS dB C C VOUT IMAX ILIMIT ISC IQ VDROP VLINE VLOAD Output Voltage Accuracy Maximum Load Current Current Limit Short-Circuit Current Ground Pin Current Dropout Voltage Line Regulation Load Regulation Output Noise Ripple Rejection Thermal Shutdown Temperature Thermal Shutdown Hysteresis Thermal Resistance VOUT=0V, VIN=5.0V IOUT=0mA to 300mA, VIN=5.0V IOUT=1mA IOUT=100mA IOUT=300mA VOUT+0.48V 350 50 1.3 145 480 0.3 0.02 eN PSRR TSD THYS SOT-23 320 180 180 C/W C/W C/W JA SOT-89 TO-92 Fortune Semiconductor Corp. 5/13 Rev. 2.0 FS8853 (VIN=5.0V, CIN=1F, COUT=3.3F, TA=+25, FS8853-33PL tested, unless otherwise noted.) Output Voltage vs. Input Voltage 4 Ground Pin Current vs. Temperature Typical Operating Characteristics 28.0 Ground Pin Current (A) 27.5 27.0 26.5 26.0 25.5 25.0 24.5 0 1 2 3 4 5 6 7 8 9 1mA 100mA 200mA 300mA 3.5 Output Voltage (V) 3 2.5 2 1.5 1 0.5 0 Input Voltage (V) -40 -20 0 20 40 60 80 Temperature (C) Dropout Voltage vs. Output current 1.35 500 Dropout Voltage (mV) 400 Ron () 300 200 100 0 0 50 100 150 200 250 300 350 400 Output Current (mA) 1.30 1.25 1.20 1.15 1.10 1.05 1.00 0 50 Ron vs. Output current 100 150 200 250 300 350 400 Output Current (mA) Power Supply Rejection Ratio vs. Frequency Ground Pin Current (uA) Ground Pin Current vs. Output Current 25.8 25.75 25.7 25.65 25.6 25.55 25.5 25.45 25.4 0 50 100 150 200 250 300 350 400 80 70 60 PSRR (dB) 50 40 30 20 10 0 0.01 0.1 1 Frequency (kHz) 10 100 Output Current (mA) Fortune Semiconductor Corp. 6/13 Rev. 2.0 FS8853 Output Voltage vs. Temperature 3.35 Output Voltage (V) 3.33 3.31 3.29 3.27 3.25 -40 -20 0 20 40 60 80 Temperature (C) Ground Pin Current (A) 50 45 40 35 30 25 20 15 10 5 0 0 1 2 3 4 5 6 7 Input Voltage (V) 8 9 10 Ground Pin Current vs. Input Voltage Output Noise DC to 1MHz (60.9VRMS), IOUT=0mA Output Noise DC to 1MHz (371VRMS), IOUT=300mA Line Transient (IOUT=1mA, VIN=4V-5V) Line Transient (IOUT=10mA, VIN=4V-5V) Fortune Semiconductor Corp. 7/13 Rev. 2.0 FS8853 Line Transient (IOUT=100mA, VIN=4V-5V) Line Transient (IOUT=200mA, VIN=4V-5V) Load Transient (IOUT=1mA-100mA) Load Transient (IOUT=100mA-200mA) Load Transient (IOUT=200mA-300mA) Load Transient (IOUT=1mA-300mA) Fortune Semiconductor Corp. 8/13 Rev. 2.0 FS8853 Detail Description The FS8853 is a low-dropout linear regulator. The device provides preset 2.5V and 3.3V output voltages for output current up to 300mA. Other mask options for special output voltages from 1.5V to 5.0V with 100mV increment are also available. As illustrated in function block diagram, it consists of a 1.25V reference, error amplifier, P-channel pass transistor and an internal feedback voltage divider. The 1.25V bandgap reference is connected to the error amplifier, which compares this reference with the feedback voltage and amplifies the voltage difference. If the feedback voltage is lower than the reference voltage, the pass-transistor gate is pulled lower, which allows more current to pass to the output pin and increases the output voltage. If the feedback voltage is too high, the pass-transistor gate is pulled up to decrease the output voltage. The output voltage is feedback through an internal resistive divider connected to OUT pin. Additional blocks include an output current limiter, thermal sensor, and shutdown logic. Internal P-channel Pass Transistor Current Limit The FS8853 also include a fold back current limiter. It monitors and controls the pass transistor's gate voltage, estimates the output current, and limits the output current within 0.6A. Thermal Overload Protection Thermal overload protection limits total power dissipation in the FS8853. When the junction temperature exceeds TJ = +155C, a thermal sensor turns off the pass transistor, allowing the IC to cool down. The thermal sensor turns the pass transistor on again after the junction temperature cools down by 20C, resulting in a pulsed output during continuous thermal overload conditions. Thermal overload protection is designed to protect the FS8853 in the event of fault conditions. For continuous operation, the maximum operating junction temperature rating of TJ = +125C should not be exceeded. Operating Region and Power Dissipation The FS8853 features a P-channel MOSFET pass transistor. Unlike similar designs using PNP pass transistors, P-channel MOSFETs require no base drive, which reduces ground pin current. PNP-based regulators also waste considerable current in dropout when the pass transistor saturates, and use high base-drive currents under large loads. The FS8853 does not suffer from these problems and consumes only 30A (Typ.) of ground pin current under heavy loads as well as in dropout conditions. Output Voltage Selection Maximum power dissipation of the FS8853 depends on the thermal resistance of the case and circuit board, the temperature difference between the die junction and ambient air, and the rate of airflow. The power dissipation across the devices is P = IOUT x (VIN-VOUT). The resulting maximum power dissipation is: PMAX = (TJ JC - T A ) (TJ - T A ) = + CA JA The FS8853 output voltage is preset at an internally trimmed voltage 2.5V, 3.3V or can be mask-optioned from 1.5V to 5.0V with 100mV increment. The first two digits of part number suffix identify the output voltage (see Ordering Information). For example, the FS8853-33CL has a preset 3.3V output voltage. Where (TJ-TA) is the temperature difference between the FS8853 die junction and the surrounding air, JC is the thermal resistance of the package chosen, and CA is the thermal resistance through the printed circuit board, copper traces and other materials to the surrounding air. For better heat-sinking, the copper area should be equally shared between the IN, OUT, and GND pins. Fortune Semiconductor Corp. 9/13 Rev. 2.0 FS8853 If the FS8853 uses a SOT-89 package and this package is mounted on a double sided printed circuit board with two square inches of copper allocated for "heat spreading", the resulting JA is 180 C/W. Based on a maximum operating junction temperature 125 C with an ambient of 25C, the maximum power dissipation will be: copper area connected to the GND pin for "heat spreading". Input-Output Voltage PMAX = (TJ JC - T A ) (125 - 25) = = 0.555W + CA 180 A regulator's minimum input-output voltage differential, or dropout voltage, determines the lowest usable supply voltage. In battery-powered systems, this will determine the useful end-of-life battery voltage. The FS8853 uses a P-channel MOSFET pass transistor, its dropout voltage is a function of drain-to-source on-resistance (RDS(ON)) multiplied by the load current. VDROPOUT = VIN-VOUT = RDS(ON) x IOUT Thermal characteristics were measured using a double sided board with 1" x 2" square inches of Fortune Semiconductor Corp. 10/13 Rev. 2.0 FS8853 Package Outline SOT-23 Fortune Semiconductor Corp. 11/13 Rev. 2.0 FS8853 SOT-89 Fortune Semiconductor Corp. 12/13 Rev. 2.0 FS8853 TO-92 Fortune Semiconductor Corp. 13/13 Rev. 2.0 |
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