FS8844 FORTUNE | Alldatasheet
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REV. 1.8 FS8844-DS-18_EN MAY 2014 Datasheet FS8844 250 mA Low Quiescent Current LDO Linear Regulator FORTUNE' Properties For Reference Only
R e v . 1 . 8 2/10 Fortune Semiconductor Corporation 富晶電子股份有限公司 Danshui Dist., New Taipei City 251, Taiwan Tel.：886-2-28094742 Fax：886-2-28094874 www.ic-fortune.com This manual contains new product information. Fortune Semiconductor Corporation reserves the rights to modify the product specification without fu rther notice. No liab ility is assumed by Fortune Semiconductor Corporation as a result of the use of this product. No rights under any patent accompany the sale of the product. FORTUNE' Properties For Reference Only
R e v . 1 . 8 3/10 1. General Description The FS8844 series is a positive voltage regulator with high accuracy output voltage and ultra-low quiescent current which is typically 2.0 μA. The device is ideal for handheld communication equipments and battery powered applications which require low quiescent current. The FS8844 contains a bandgap reference voltage source, an error amplifier, a P-channel pass transistor, a resistor-divider for setting output voltage, a current limiter, and temperature limit protection circuits. The high-accuracy output voltage is preset at an internally trimmed voltage 1.8V, 2.8V or 3.3V. Other output voltages c an be mask-optioned from 1.2V to 5.0V with 100mV increment. The FS8844 has been designed to be used with low cost ceramic capacitors and requires a minimum output capacitor of 1.0 μF. The devices are available in SOT-23 packages. 2. Applications y DSC y PDA y MP3 player y Digital Video Recorder y Battery Powered Instrument y Portable Commu 3. Features y 2.0µA Quiescent Current (Typ.) y High accuracy of output voltage y ±2.0% : VOUT≧2.1 V y ±2.4% : VOUT≦2.0 V y Low Dropout: 550 mV @ IOUT=250mA (MIN.) y 250 mA Output y Thermal Overload Shutdown Protection y Output Short Circuit Protection y Stable Operation with Virtually Any Output Capacitor Type y SOT-23 Packages 4. Ordering Information FS8844-xx x x Package Pin Out C : SOT-23 1.GND 2.OUT 3.IN G : G stands for Green-Package Output Voltage 18 : 1.8V 28 : 2.8V 3 0 : 3 . 0 V : 33 : 3.3V Note : Mask option output types are available by order only. FORTUNE' Properties For Reference Only
R e v . 1 . 8 4/10 5. Pin Configurations 6. Package Marking Information 7. Pin Description Part NO. Symbol Description FS8844-xxxx GND Ground pin that provides the reference for all voltages. IN Regulator input pin that supplies voltage can range from 2.5V to 6.0V. Bypass this pin with a 1µF capacitor to GND. OUT Regulator output pin that can source up to 250mA. Bypass this pin with a 1µF capacitor to GND. SOT-23 EX：FS8844-33GC Top Point: Lot No. Bottom Point: Year w : week, A~Z & A ~ Z Part No. Pin 1 Pin 2 Pin 3 FS8844-xxGC GND OUT IN S 33 C . . . W FORTUNE' Properties For Reference Only
R e v . 1 . 8 5/10 8. Functional Block Diagram 1.25V Bandgap Reference Thermal Protection Current Limit Shutdown Logic ON/OFF Circuit 9. Typical Application Circuit FS8844 GND IN OUT 1μF 1μF IN GND OUT FORTUNE' Properties For Reference Only
R e v . 1 . 8 6/10 10. Absolute Maximum Ratings Continuous power dissipation, PD 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. 11. Electrical Characteristics (TA=25℃, unless otherwise noted.) Symbol Parameter Test Conditions Min Typ Max Unit VIN Input Voltage 1.8 6.0 V ∆VOUT Output Voltage Accuracy VIN>VOUT+1.0V, VOUT≦2.0V -2.4 +2.4 % VIN>VOUT+1.0V, VOUT≧2.1V -2.0 +2.0 % IMAX Output Current VIN>VOUT+1.0V 250 300 mA ISC Short-Circuit Current VOUT=0V, VIN>VOUT+0.48V 200 300 mA IQ Quiescent Current ILOAD=0mA, VIN=VOUT+1.0V 2.0 4.5 µA VDROP Dropout Voltage VIN=VOUT=3.3V, IOUT=100mA 280 350 mV VIN=VOUT=3.3V, IOUT=250mA 700 850 mV ∆VLINE Line Regulation VIN = 4.0 ~ 5.5 V, ILOAD=1mA 0.10 %/V ∆VLOAD Load Regulation IOUT=1mA to 100mA 0.01 %/mA VIH EN Pin Input Voltage “H” VIH ≦ VIN 0.9 1.0 1.5 V VIL EN Pin Input Voltage “L” 0.8 V IEN EN Pin Leakage Current 0.01 0.1 µA eN Output Noise F=1Hz to 10KHz, COUT=1µF 150 µVRMS PSRR Ripple Rejection F=100Hz, COUT=1µF 50 dB TSD Thermal Shutdown Temperature 155 °C THYS Thermal Shutdown Hysteresis 10 °C TC Output Voltage Temperature Coefficent IOUT=1mA, -40°C ≤ TA ≤ 80°C 100 ppm/°C FORTUNE' Properties For Reference Only
R e v . 1 . 8 7/10 12. Typical Operating Characteristics (FS8844-33GC tested, CIN=1.0µF, COUT=1.0µF, TA=+25℃, unless otherwise noted.) Output Voltage vs. Input Voltage 0.5 1.5 2.5 3.5 0123456 Output Voltage (V) Input Voltage (V) Output Voltage vs. Output Current 3.2 3.25 3.3 3.35 3.4 3.45 0 2 04 06 08 0 1 0 0 1 2 0 1 4 0 Output Current (mA) Output Voltage (V) Output Voltage v.s Temperature(VOUT=3.3V) 3.27 3.28 3.29 3.3 3.31 3.32 3.33 -45 -25 0 25 50 75 100 125Temperature (℃) Output Voltage (V) Input Voltage vs. Ground Pin Current 0.5 1.5 2.5 3 . 544 . 555 . 566 . 57 Input Voltage (V) Ground Pin Current (uA) Dropout Voltage(Vout=3.3V) 120 150 20 40 60 80 100Iload(mA) Dropout Voltage (mV) 125℃ 25℃ Quiescient Current v.s Temperature 1.2 1.4 1.6 1.8 2.2 2.4 - 3 003 06 0 9 0 1 2 0 Temperature (℃) Quiescient Current (uA) FORTUNE' Properties For Reference Only
R e v . 1 . 8 8/10 PSRR (Vin=5V,Vout=3.3V,Load=50mA) POWER SUPPLY REJECT ION RAT IO v s FREQUENCY 100 0.01 0.1 1 10 100 FREQUENCY (KHz) PSRR(db) Line Transient, Vin=4~5V, Iout=30mA Load Transient, Vin=3.3V, Iout=0~50mA Load Transient, Vin=3.3V, Iout=60~110mA FORTUNE' Properties For Reference Only
R e v . 1 . 8 9/10 13. Detail Description The FS8844 is a low quiescent current LDO linear regulator. The device provides preset 1.8V, 2.8V and 3.3V output voltages for output current up to 150mA. Other mask options for special output voltages from 1.2V to 5.0V with 100mV increment are also available. As illustrated in function block diagram, it consists of a 1.23V reference, error amplifier, a P-channel pass transistor, an ON/OFF control logic, and an internal feedback voltage divider. The 1.23V 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 feed back through an internal resistive divider connected to OUT pin. Additional blocks include an output current limiter and shutdown logic. Internal P-channel Pass Transistor The FS8844 features a P-channel MOSFET pass transistor. Unlike similar designs using PNP pass transistors, P-channel MOSFETs require no base drive, which reduces quiescent current. PNP-based regulators also waste considerable current in dropout conditions when the pass transistor saturates, and use high base-drive currents under large loads. The FS8844 does not suffer from these problems and consumes only 2.0μA (Typ.) of current consumption under light loads. Output Voltage Selection The FS8844 output voltage is preset at an internally trimmed voltage 1.8V, 2.8V or 3.3V. The output voltage also can be mask-optioned from 1.2V to 5.0V with 100mV increment by special order. The first two digits of part number suffix identify the output voltage (see Ordering Information For example, the FS8844-33GC has a preset 3.3V output voltage. Current Limit The FS8844 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 350mA. Thermal Overload Protection Thermal overload protection limits total power dissipation in the FS8844. When the junction temperature exceeds T J = +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 10°C , resulting in a pulsed output during continuous thermal overload conditions. Thermal overload protection is designed to protect the FS8844 in the event of fault conditions. For continuous operation, the maximum operating junction temperature rating of T J = +125°C should not be exceeded. Input-Output Voltage 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 FS8844 uses a P-channel MOSFET pass transistor, its dropout voltage is a function of drain-to-source on-resistance (R DS(ON)) multiplied by the load current. V DROPOUT = VIN-VOUT = RDS(ON) x IOUT FORTUNE' Properties For Reference Only
R e v . 1 . 8 10/10 14. Package Outline SOT-23 15. Revision History Ver. Date Page Description 1.0 2005/12/22 4 ~ 6 Typical Operating Characteristics 1.1 2006/02/10 2~9 Pin Configurati ons, Rev. no from page 2 to 9 1.2 2006/03/10 1,4 Electr ical Characteristics 1.3 2006/05/11 1,7 Add 1.2V, 1.28V option 1.4 2006/09/27 All Revise datasheet format 1.5 2009/12/30 3 Update package type G stands for Green-Package Update Output Voltage 18：1.8V、29：2.9V、30：3.0V、33：3.3V 1.6 2010/03/04 6 Revise Dropout Iout=100mA Typ ：280mV Max：350mV Revise Dropout Iout=250mA Typ：700mV Max：850mV 1.7 2011/01/31 3 Add Output 3.0V option 1.8 2014/05/22 2 Revised company address FORTUNE' Properties For Reference Only