FS8855 500mA LDO Linear Regulator General Description Ordering Information The FS8855 is a low-dropout linear regulator that operations in the input voltage range from +2.5V to +9.0V and delivers 500mA output current. FS8855-xx x x Package D：TO-92 E：TO-92 F：TO-92 W：TO-92 G：SOT-223 H：SOT-223 J：SOT-223 X：SOT-223 K：SOT-89 L：SOT-89 I：SOT-89 Y：SOT-89 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 1.3V to 4.5V with 100mV increment, except FS8855-29Cx which has 2.85V output voltage. The FS8855 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 FS8855 devices are available in TO-92, SOT-89 and SOT-223 packages. Features Pin Out 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 Temperature Range Low dropout voltage 650mV at 500mA (Typ.) C：Commercial Standard P : Commercial Standard, Lead(Pb) Free and Phosphorous(P) Free Package Up to ±35mV output voltage accuracy (VIN ≦7V) Output Voltage Preset at 2.5V, 3.3V 13 : 1.3V 14 : 1.4V 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 Mask options from 1.3V to 4.5V Small output capacitor Output current limit Thermal overload shutdown protection TO-92, SOT-89 and SOT-223 Package Applications CD-ROM Drivers DVD-ROM Drivers 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 Note : Mask option output types are available by order only Portable Consumer Equipment Radio Control Systems Wireless Communication Systems Fortune Semiconductor Co. http://www.fsc.com.tw TEL : +886-2-2809-4742 FAX: +886-2-2809-4874 1/13 TD-0405007 Rev. 1.4 FS8855 500mA LDO Linear Regulator Pin Configurations TO-92 Part No. Pin 1 Pin 2 Pin 3 FS8855 -xxxD IN GND OUT FS8855 GND -xxxE IN OUT FS8855 OUT GND -xxxF IN FS8855 GND OUT -xxxW IN 1 IN FS8855 GND -xxxH FS8855 -xxxK 3 IN FS8855 GND -xxxL (BOTTOM VIEW) GND OUT IN OUT FS8855 OUT GND -xxxI IN FS8855 GND OUT -xxxY IN FS8855 xxxxxxxx 1 2 3 SOT-223 Part No. Pin 1 Pin 2 Pin 3 FS8855 -xxxG 2 SOT-89 Part No. Pin 1 Pin 2 Pin 3 GND OUT IN FS8855 xxxxxxxx OUT FS8855 GND OUT -xxxJ IN FS8855 OUT GND -xxxX IN 1 2 3 Package Marking Information EX：FS8855-33CL FS8855 33CLxxxx xxxx：Date Code EX：FS8855-33PL FS8855 33PLxxxx xxxx：Date Code Fortune Semiconductor Co. http://www.fsc.com.tw TEL : +886-2-2809-4742 FAX: +886-2-2809-4874 2/13 TD-0405007 Rev. 1.4 FS8855 500mA LDO Linear Regulator Pin Description Part NO. 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 GND Description Ground pin. IN Regulator input pin. OUT Regulator output pin. IN is the regulator input pin. Supply voltage can range from 2.5V to 9.0V. Bypass with a 1µF capacitor to GND. OUT is the output voltage pin. Sources up to 500mA. Bypass with a 3.3µF capacitor to GND. GND provides the reference for all voltages. Functional Block Diagram IN Current Limit Thermal Protection Shutdown Logic OUT R1 1.25V Bandgap Reference R2 GND Fortune Semiconductor Co. http://www.fsc.com.tw TEL : +886-2-2809-4742 FAX: +886-2-2809-4874 3/13 TD-0405007 Rev. 1.4 FS8855 500mA LDO Linear Regulator Typical Application Circuit Absolute Maximum Ratings Input voltage VIN to GND -------------------------------------------------------------------------------------------------- 10V Output current limit, I(LIMIT) -------------------------------------------------------------------------------------------------- 0.8A Continuous power dissipation, PD (∆T= TJ -TA = 100°C) SOT-223 ---------------------------------------------------------------------------------------------------------------------------------------- 0.65W SOT-89 ---------------------------------------------------------------------------------------------------------------------------------------- 0.55W ---------------------------------------------------------------------------------------------------------------------------------------- 0.55W TO-92 * The power dissipation values are based on the condition that junction temperature TJ and ambient temperature TA difference is 100°C. Junction Temperature, TJ ----------------------------------------------------------------------------------------------- +155°C Storage temperature range, TSTG ---------------------------------------------------------------------- -55℃ to +150°C Operating junction temperature range ---------------------------------------------------------------- -40℃ to +125°C Lead temperature (soldering, 10sec) ------------------------------------------------------------------------------- 260°C * 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 Co. http://www.fsc.com.tw TEL : +886-2-2809-4742 FAX: +886-2-2809-4874 4/13 TD-0405007 Rev. 1.4 FS8855 500mA LDO Linear Regulator Electrical Characteristics (TA=25℃, unless otherwise noted.) Symbol VIN Parameter Test Conditions Input Voltage VIN=VOUT+0.8V, IOUT=1mA, VIN≦7V VOUT Output Voltage VIN=VOUT+0.8V, IOUT=1mA, 7V＜VIN ≦9V ∆ VOUT Output Voltage Accuracy IMAX Maximum Load Current ILIMIT Current Limit Min 2.5 VOUT0.035 VOUT0.042 Typ VOUT VOUT Max Unit 9.0 VOUT+ 0.035 VOUT+ 0.042 V V V VIN>VOUT+0.8V, VIN≦7V -35 +35 mV VIN>VOUT+0.8V, 7V＜VIN≦9V -42 +42 mV 500 mA 0.8 A ISC Short-Circuit Current VOUT=0V, VIN>VOUT+0.8V 350 400 mA IQ Ground Pin Current ILOAD=0mA to 500mA, VIN=VOUT+0.8V 65 120 µA IOUT=1mA 1 1.2 mV IOUT=100mA 100 120 mV IOUT=500mA 650 800 mV VDROP Dropout Voltage ∆VLINE Line Regulation VOUT+0.8V<VIN<9V, ILOAD=1mA 0.2 0.3 %/V ∆VLOAD Load Regulation IOUT=0mA to 500mA 0.01 0.02 %/mA Output Noise F=1Hz to 10KHz, COUT=3.3µF 75 µVRMS Ripple Rejection Thermal Shutdown Temperature Thermal Shutdown Hysteresis F=10KHz, COUT=3.3µF 75 dB 155 °C 20 °C eN PSRR TSD THYS θJA Thermal Resistance Fortune Semiconductor Co. http://www.fsc.com.tw SOT-223 155 °C/W SOT-89 180 °C/W TO-92 180 °C/W TEL : +886-2-2809-4742 FAX: +886-2-2809-4874 5/13 TD-0405007 Rev. 1.4 FS8855 500mA LDO Linear Regulator Typical Operating Characteristics (CIN=1.0µF, COUT=3.3µF, TA=+25℃, unless otherwise noted.) GROUND PIN CURRENT vs. AMBIENT TEMPERATURE 3.5 80 3 70 GROUND PIN CURRENT (µA) OUTPUT VOLTAGE (V) OUTPUT VOLTAGE vs. INPUT VOLTAGE 2.5 2 1.5 1 0.5 0 1mA 100mA 250mA 500mA 60 50 40 30 20 10 0 0 1 2 3 4 5 6 7 8 9 -40 -30 INPUT VOLTAGE (V) -20 -10 0 10 20 30 40 50 60 70 80 AMBIENT TEMPERATURE (℃) *EX：Model FS8855-33Cx Ron vs. LOAD CURRENT DROPOUT VOLTAGE vs. LOAD CURRENT 900 1.30 800 700 1.20 600 Ron (Ω) DROPOUT VOLTAGE (mV) 1.40 500 400 1.10 1.00 300 200 0.90 100 0 0.80 50 100 150 200 250 300 350 400 450 500 550 600 50 100 LOAD CURRENT (mA) 250 300 350 400 450 500 550 600 GND PIN CURRENT vs. LOAD CURRENT 68 90 GROUND PIN CURRENT (µA) 80 70 PSRR (db) 200 LOAD CURRENT (mA) POWER SUPPLY REJECTION RATIO vs. FREQUENCY 60 50 40 30 20 10 66 64 62 60 58 56 54 0 0.01 150 0.1 1 10 100 1 1000 FREQUENCY (KHz) Fortune Semiconductor Co. http://www.fsc.com.tw TEL : +886-2-2809-4742 FAX: +886-2-2809-4874 100 200 300 400 500 600 LOAD CURRENT (mA) 6/13 TD-0405007 Rev. 1.4 FS8855 500mA LDO Linear Regulator OUTPUT VOLTAGE vs. AMBIENT TEMPERATURE GROUND PIN CURRENT vs. INPUT VOLTAGE 160 GROUND PIN CURRENT (µA) OUTPUT VOLTAGE (V) 3.36 3.34 3.32 3.30 3.28 140 120 100 80 60 40 20 0 3.26 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 0 AMBIENT TEMPERATURE (℃) 1 2 3 4 5 6 7 8 9 OUTPUT NOISE to 1MHz (74uVRMS) Iload =0mA Iload =500mA LINE TRANSIENT (IOUT=0mA) LINE TRANSIENT (IOUT=10mA) 5.0V 4.0V http://www.fsc.com.tw 5.0V VIN 4.0V VOUT VOUT Fortune Semiconductor Co. 11 INPUT VOLTAGE (V) OUTPUT NOISE DC to 1MHz (39uVRMS) VIN 10 CIN 1µF COUT 3.3µF CIN 1µF COUT 3.3µF 50mV/div 50mV/div TEL : +886-2-2809-4742 FAX: +886-2-2809-4874 7/13 TD-0405007 Rev. 1.4 FS8855 500mA LDO Linear Regulator LINE TRANSIENT (IOUT=200mA) LINE TRANSIENT (IOUT=300mA) 5.0V 5.0V 4.0V VIN VOUT 4.0V VIN VOUT CIN 1µF COUT 3.3µF 50mV/div CIN 1µF COUT 3.3µF 50mV/div LOAD TRANSIENT LOAD TRANSIENT 250mA 100mA IOUT 0mA 100mA IOUT VOUT VOUT CIN 1µF COUT 3.3µF CIN 1µF COUT 3.3µF 50mV/div 50mV/div LOAD TRANSIENT LOAD TRANSIENT 500mA 500mA IOUT 250mA VOUT Fortune Semiconductor Co. http://www.fsc.com.tw 0mA IOUT VOUT CIN 1µF COUT 3.3µF CIN 1µF COUT 3.3µF 50mV/div 100mV/div TEL : +886-2-2809-4742 FAX: +886-2-2809-4874 8/13 TD-0405007 Rev. 1.4 FS8855 500mA LDO Linear Regulator Detail Description The FS8855 is a low-dropout linear regulator. The device provides preset 2.5V and 3.3V output voltages for output current up to 500mA. Other mask options for special output voltages from 1.3V to 4.5V 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 The FS8855 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 FS8855 does not suffer from these problems and consumes only 65µA (Typ.) of ground pin current under heavy loads as well as in dropout conditions. Output Voltage Selection The FS8855 output voltage is preset at an internally trimmed voltage 2.5V, 3.3V or can be mask-optioned from 1.3V to 4.5V with 100mV increment. The first two digits of part number suffix identify the output voltage (see Ordering Information). For example, the FS8855-33CL has a preset 3.3V output voltage. Current Limit Fortune Semiconductor Co. http://www.fsc.com.tw TEL : +886-2-2809-4742 FAX: +886-2-2809-4874 The FS8855 also includes 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 0.8A. Thermal Overload Protection Thermal overload protection limits total power dissipation in the FS8855. When the junction temperature exceeds TJ = +155°C, 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 20°C, resulting in a pulsed output during continuous thermal overload conditions. Thermal overload protection is designed to protect the FS8855 in the event of fault conditions. For continuous operation, the maximum operating junction temperature rating of TJ = +125°C should not be exceeded. Operating Region and Power Dissipation Maximum power dissipation of the FS8855 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 θ JC − T A ) (TJ − T A ) = θ JA + θ CA Where (TJ-TA) is the temperature difference between the FS8855 die junction and the surrounding air, θJC is the thermal resistance of the package chosen, and θCA 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. If the FS8855 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 θJA is 9/13 TD-0405007 Rev. 1.4 FS8855 500mA LDO Linear Regulator 180°C/W. Input-Output Voltage Based on a maximum operating junction temperature 125°C with an ambient temperature of 25°C, the maximum power dissipation will be: PMAX = (TJ θ JC − T A ) (125 − 25) = = 0.555W + θ 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 FS8855 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. Thermal characteristics were measured using a double sided board with 1” x 2” square inches of copper area connected to the GND pin for “heat spreading”. Fortune Semiconductor Co. http://www.fsc.com.tw TEL : +886-2-2809-4742 FAX: +886-2-2809-4874 VDROPOUT = VIN-VOUT = RDS(ON) x IOUT 10/13 TD-0405007 Rev. 1.4 FS8855 500mA LDO Linear Regulator Package Outline SOT-223 Fortune Semiconductor Co. http://www.fsc.com.tw TEL : +886-2-2809-4742 FAX: +886-2-2809-4874 11/13 TD-0405007 Rev. 1.4 FS8855 500mA LDO Linear Regulator SOT-89 Fortune Semiconductor Co. http://www.fsc.com.tw TEL : +886-2-2809-4742 FAX: +886-2-2809-4874 12/13 TD-0405007 Rev. 1.4 FS8855 500mA LDO Linear Regulator TO-92 Fortune Semiconductor Co. http://www.fsc.com.tw TEL : +886-2-2809-4742 FAX: +886-2-2809-4874 13/13 TD-0405007 Rev. 1.4