FS8856 550mA LDO Linear Regulator General Description Ordering Information The FS8856 is a low-dropout linear regulator that operations in the input voltage range from +2.5V to +6.5V and delivers 550mA output current. FS8856-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 5.0V with 100mV increment, except FS8856-29Cx which has 2.85V output voltage. The FS8856 consist of a 1.25V reference compare amplifier, and a P-channel pass transistor. Other features include short-circuit protection and thermal shutdown protection. The FS8856 devices are available in TO-92, SOT-89 and SOT-223 packages. 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 C : Commercial Standard P : Commercial Standard, Lead(Pb) Free and Phosphorous(P) Free Package Features Output Voltage Low dropout voltage 750mV at 550mA (Typ.) 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 Up to ±35mV output voltage accuracy Preset at 2.5V, 3.3V Mask option from 1.3V to 5.0V Small output capacitor Output current limit Thermal overload shutdown protection TO-92, SOT-89 and SOT-223 Packages 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 Note : Mask option output types are available by order only. Applications CD-ROM Drivers DVD-ROM Drivers 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-0405008 Rev. 1.3 FS8856 550mA LDO Linear Regulator Pin Configurations TO-92 Part No. Pin 1 Pin 2 Pin 3 FS8856 -xxxD IN GND OUT FS8856 GND -xxxE IN 1 OUT FS8856 OUT GND -xxxF IN FS8856 GND OUT -xxxW IN IN FS8856 GND -xxxH 2 FS8856 -xxxK 3 IN FS8856 GND -xxxL (BOTTOM VIEW) GND OUT IN OUT FS8856 OUT GND -xxxI IN FS8856 GND OUT -xxxY IN FS8856 xxxxxxxx 1 2 3 SOT-223 Part No. Pin 1 Pin 2 Pin 3 FS8856 -xxxG SOT-89 Part No. Pin 1 Pin 2 Pin 3 GND OUT IN FS8856 xxxxxxxx OUT FS8856 GND OUT -xxxJ IN FS8856 OUT GND -xxxX IN 1 2 3 Package Marking Information EX：FS8856-33CL FS8856 33CLxxxx xxxx：Date Code EX：FS8856-33PL FS8856 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-0405008 Rev. 1.3 FS8856 550mA LDO Linear Regulator Pin Description Part NO. FS8856-xxCD FS8856-xxCE FS8856-xxCF FS8856-xxCW FS8856-xxCG FS8856-xxCH FS8856-xxCJ FS8856-xxCX FS8856-xxCK FS8856-xxCL FS8856-xxCI FS8856-xxCY Symbol GND IN OUT Description Ground pin. Regulator input pin. Regulator output pin. IN is the regulator input pin. Supply voltage can range from 2.5V to 6.5V. Bypass with a 1µF capacitor to GND. OUT is the output voltage pin. Sources up to 550mA. 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-0405008 Rev. 1.3 FS8856 550mA LDO Linear Regulator Typical Application Circuit FS8856 Absolute Maximum Ratings Input voltage VIN to GND ----------------------------------------------------------------------------------------------------- 7V Output current limit, I(LIMIT) -------------------------------------------------------------------------------------------------- 0.8A Continuous power dissipation, PD 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°C to +150°C Operating junction temperature range ---------------------------------------------------------------- -40°C 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-0405008 Rev. 1.3 FS8856 550mA LDO Linear Regulator Electrical Characteristics (TA=25℃, unless otherwise noted.) Symbol VIN VOUT Parameter Test Conditions Input Voltage Output Voltage VIN=VOUT+0.9V, IOUT=1mA ∆ VOUT Output Voltage Accuracy VIN>VOUT+0.9V, VIN≦6.5V IMAX Maximum Load Current ILIMIT Current Limit Min 2.5 VOUT0.035 -35 Typ Max Unit V VOUT 6.5 VOUT+ 0.035 +35 550 V mV mA 0.8 A ISC Short-Circuit Current VOUT=0V, VIN>VOUT+0.9V 350 400 mA IQ Ground Pin Current ILOAD=0mA to 550mA, VIN=VOUT+0.9V 65 90 µA IOUT=100mA 110 130 mV IOUT=300mA 350 420 mV IOUT=500mA 650 800 mV IOUT=550mA 750 900 mV VDROP Dropout Voltage ∆VLINE Line Regulation VOUT+0.9V<VIN<6.5V, ILOAD=1mA 0.2 0.3 %/V ∆VLOAD Load Regulation IOUT=0mA to 550mA 0.02 0.03 %/mA PSRR TSD THYS θJA Ripple Rejection Thermal Shutdown Temperature Thermal Shutdown Hysteresis Thermal Resistance Fortune Semiconductor Co. http://www.fsc.com.tw 75 dB 155 °C 20 °C 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-0405008 Rev. 1.3 FS8856 550mA LDO Linear Regulator Typical Operating Characteristics (CIN=1.0µF, COUT=3.3µF, TA=+25℃, unless otherwise noted.) OUTPUT VOLTAGE vs. INPUT VOLTAGE 70 3 GROUND PIN CURRENT (µA) OUTPUT VOLTAGE (V) 3.5 2.5 2 1.5 1 0.5 GROUND PIN CURRENT vs. AMBIENT TEMPERATURE 60 1mA 100mA 550mA 50 40 30 20 10 0 0 0 1 2 3 4 5 6 7 -40 -30 INPUT VOLTAGE (V) *EX：Model FS8856-33Cx -10 0 10 20 30 40 50 60 70 80 AMBIENT TEMPERATURE (℃) Ron vs. LOAD CURRENT DROPOUT VOLTAGE vs. LOAD CURRENT 1.40 0.8 0.7 1.30 0.6 1.20 0.5 Ron (Ω) DROPOUT VOLTAGE (V) -20 0.4 0.3 1.10 1.00 0.2 0.1 0.90 0.0 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.80 0.6 100 LOAD CURRENT (A) 250 300 350 400 450 500 550 GND PIN CURRENT vs. LOAD CURRENT 62 -100 GROUND PIN CURRENT (µA) -90 -80 PSRR (dB) 200 LOAD CURRENT (mA) POWER SUPPLY REJECTION RATIO vs. FREQUENCY -70 -60 -50 -40 -30 -20 -10 60 58 56 54 52 50 48 0 0.01 150 0.1 1 10 100 0 1000 FREQUENCY (KHz) Fortune Semiconductor Co. http://www.fsc.com.tw TEL : +886-2-2809-4742 FAX: +886-2-2809-4874 1 50 100 150 200 250 300 350 400 450 500 550 LOAD CURRENT (mA) 6/13 TD-0405008 Rev. 1.3 FS8856 550mA LDO Linear Regulator OUTPUT VOLTAGE vs. AMBIENT TEMPERATURE GROUND PIN CURRENT vs. INPUT VOLTAGE 80 GROUND PIN CURRENT (uA) OUTPUT VOLTAGE (V) 3.36 3.34 3.32 3.3 3.28 3.26 -40 -30 -20 -10 0 10 20 30 40 50 60 70 70 60 50 40 30 20 10 0 80 0 AMBIENT TEMPERATURE (℃) 1 2 3 4 5 LINE TRANSIENT (IOUT=0mA) 5.0V 4.0V CIN 1µF COUT 3.3µF VOUT 7 LINE TRANSIENT (IOUT=10mA) 5.0V VIN 6 INPUT VOLTAGE (V) 4.0V VIN CIN 1µF COUT 3.3µF VOUT 50mV/div 50mV/div LINE TRANSIENT (IOUT=550mA) LINE TRANSIENT (IOUT=250mA) 5.0V 5.0V VIN VOUT 4.0V 4.0V CIN 1µF COUT 3.3µF VIN VOUT 50mV/div LOAD TRANSIENT 50mV/div Fortune Semiconductor Co. http://www.fsc.com.tw TEL : +886-2-2809-4742 FAX: +886-2-2809-4874 CIN 1µF COUT 3.3µF 7/13 TD-0405008 Rev. 1.3 FS8856 550mA LDO Linear Regulator 100mA 250mA IOUT 0mA IOUT 100mA VOUT CIN 1µF COUT 3.3µF VOUT CIN 1µF COUT 3.3µF 50mV/div 50mV/div LOAD TRANSIENT LOAD TRANSIENT 550mA IOUT 250mA VOUT CIN 1µF COUT 3.3µF 500mA IOUT 0mA CIN 1µF COUT 3.3µF VOUT 100mV/div 50mV/div LOAD TRANSIENT Fortune Semiconductor Co. http://www.fsc.com.tw TEL : +886-2-2809-4742 FAX: +886-2-2809-4874 8/13 TD-0405008 Rev. 1.3 FS8856 550mA LDO Linear Regulator Detail Description Current Limit The FS8856 is a low-dropout linear regulator. The device provides preset 2.5V and 3.3V output voltages for output current up to 550mA. Other mask options for special output voltages from 1.3V 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 The FS8856 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 FS8856 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 FS8856 output voltage is preset at an internally trimmed voltage 2.5V, 3.3V or can be mask-optioned from 1.3V to 5.0V with 100mV increment. The first two digits of part number suffix identify the output voltage (see Ordering Information). For example, the FS8856-33CL has a preset 3.3V output voltage. Fortune Semiconductor Co. http://www.fsc.com.tw TEL : +886-2-2809-4742 FAX: +886-2-2809-4874 The FS8856 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 FS8856. 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 FS8856 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 FS8856 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 FS8856 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 FS8856 uses a SOT-89 package and this package is mounted on a double sided printed 9/13 TD-0405008 Rev. 1.3 FS8856 550mA LDO Linear Regulator circuit board with two square inches of copper allocated for “heat spreading”, the resulting θJA is 180°C/W. spreading”. Based on a maximum operating junction temperature 125°C with an ambient of 25°C, the maximum power dissipation will be: 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 FS8856 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. PMAX = (TJ θ JC − T A ) (125 − 25) = = 0.555W + θ CA 180 Input-Output Voltage VDROPOUT = VIN-VOUT = RDS(ON) x IOUT 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 Fortune Semiconductor Co. http://www.fsc.com.tw TEL : +886-2-2809-4742 FAX: +886-2-2809-4874 10/13 TD-0405008 Rev. 1.3 FS8856 550mA 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-0405008 Rev. 1.3 FS8856 550mA 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-0405008 Rev. 1.3 FS8856 550mA 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-0405008 Rev. 1.3