BCT2050EUKAJ-TR

BCT2050 Low Power Low Dropout Regulators BCT2050 Low Power, Low Dropout Regulators GENERAL DESCRIPTION FEATURES The BCT2050 series are low-power, low-noise, low-dropout CMOS linear voltage regulators. They are the perfect choice for low voltage, low power applications. A low ground current makes this part attractive for battery operated power systems. The BCT2050 series also offer ultra-low dropout voltage to prolong battery life in portable electronics. Systems requiring a quiet voltage sources, such as RF applications, will benefit from the BCT2050 series ultra-low output noise (30uVRMS) and high PSRR. An external noise bypass capacitor connected to the device’s BP pin can further reduce the noise level.           Other features include a 10nA logic-controlled shutdown mode, foldback current limit and thermal shutdown protection. The BCT2050 is available in Green SOT23-5 packages. It operates over an ambient temperature range of -40°C to +85°C. Low Output Noise Low Dropout Voltage Thermal-Overload Protection Output Current Limit High PSRR(74dB at 1kHz) 10nA Logic-Controlled Shutdown Available in Multiple output Voltage Versions Adjustable Output from 0.8V to 5.0V -40°C to 85°C Operating Temperature Range Available in Green SOT23-5 Packages APPLICATIONS Cellular Telephones Cordless Telephones PCMCIA Cards Modems MP3 Player Hand-Held Instruments Portable/Battery-Powered Equipment ORDERING INFORMATION Order Number VOUT(V) Package Type Temperature Range Marking QTY/Reel BCT2050EUKAJ-TR ADJ SOT23-5 -40°C to +85°C JJXX 3000 "XX" in Marking will be appeared as the batch code. REV1.0 www.broadchip.com Copyright © BROADCHIP TECHNOLOGY CO., LTD 1 BCT2050 Low Power Low Dropout Regulators ABSOLUTE MAXIMUM RATINGS CAUTION IN to GND..........................................................-0.3V to 6V This integrated circuit can be damaged by ESD if you don’t EN to GND…………….......................................-0.3V to VIN pay attention to ESD protection. Broadchip recommends OUT, BP/FB to GND..............................-0.3V to (VIN+0.3V) that all integrated circuits be handled with appropriate Output Short-Circuit Duration....................................Infinite precautions. Failure to observe proper handling and Power Dissipation, PD@TA=25℃ installation procedures can cause damage. ESD damage SOT23-5......................................................................0.5W can range from subtle performance degradation to Package Thermal Resistance complete device failure. Precision integrated circuits may SOT23-5, θJA........................................................260℃/W be more susceptible to damage because very small Junction Temperature................................................150℃ parametric changes could cause the device not to meet its Operating Temperature Range....................-40℃ to +85℃ published specifications. Storage Temperature Range.......................-65℃ to 150℃ Lead Temperature (Soldering, 10 sec).......................260℃ Broadchip reserves the right to make any change in circuit ESD Susceptibility design, specification or other related things if necessary HBM..........................................................................4000V without notice at any time. Please contact Broadchip sales MM..............................................................................200V office to get the latest datasheet. NOTE: Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. REV1.0 www.broadchip.com Copyright © BROADCHIP TECHNOLOGY CO., LTD 2 BCT2050 Low Power Low Dropout Regulators PIN CONFIGURATION SOT23-5 TOP VIEW 1 GND 2 EN 3 5 OUT 4 FB MARKING IN PIN DESCRIPTION PIN SOT23-5 NAME FUNCTION 1 IN 2 GND 3 EN Shutdown Input. A logic low reduces the supply current to 10nA. Connect to IN for normal operation. 4 FB This is used to set the output voltage of the device. 5 OUT Regulator Input. Supply voltage can range from 1.6V to 5.5V. Bypass with a 1uF capacitor to GND. Ground. Regulator Output. REV1.0 www.broadchip.com Copyright © BROADCHIP TECHNOLOGY CO., LTD 3 BCT2050 Low Power Low Dropout Regulators ELECTRICAL CHARACTERISTICS (VIN= VOUT(NOMINAL)+0.5V(1), Full = -40℃ to +85℃, unless otherwise specified.) PARAMETER SYM Input Voltage VIN Output Voltage Accuracy FB Voltage Accuracy CONDITIONS (1) (1) MIN ILIM Ground Pin Current IQ 5.5 V IOUT=0.1mA -2.0% 2.0% V IOUT=0.1mA 0.784 0.816 V No load, EN = VIN IOUT=500mA ΔVLNR Line Regulation ΔVLDR Load Regulation Output Voltage Noise en 0.8 500 mA 800 mA 30 uA VOUT = 0.8V 626 VOUT = 1.2V 345 VOUT = 2.8V 116 VOUT = 3.3V 105 VOUT = 5.0V 88 mV VIN=1.6V or (VOUT+0.5V) to 5.5V, IOUT=1mA 0.02 IOUT=1mA to 500mA, COUT=1uF, VOUT>2V 0.002 0.005 IOUT=1mA to 500mA, COUT=1uF, VOUT≤2V 0.004 0.008 0.05 %/V %/mA f=10Hz to 100kHz, COUT=10uF ILOAD=50mA, COUT=1uF, PSRR VIN=VOUT+1V f=1kHz Power Supply Rejection Ratio MAX UNITS 1.6 Maximum Output Current Current Limit TYP 150 uVRMS 74 dB SHUTDWON(3) VIH EN Input Threshold VIL EN Input Bias Current EN=5.5V 1.5 1.6 VIN 0 0.15 0.3 V 1 uA EN=0V 0.01 uA IQ(SHDN) EN=0V 0.01 uA 20 us 150 °C 15 °C IIN Shutdown Supply Current VIN=1.6V to 5.5V, VEN=-0.3V to VIN COUT=1uF, No Load Shutdown Exit Delay(4) THERMAL PROTECTION Thermal Shutdown Temperature TSHDN Δ Thermal Shutdown Hysteresis TSHDN NOTES: 1. VIN = VOUT (NOMINAL) + 0.5V or 1.6V, whichever is greater. REV1.0 www.broadchip.com Copyright © BROADCHIP TECHNOLOGY CO., LTD 4 BCT2050 Low Power Low Dropout Regulators 2. The dropout voltage is defined as VIN - VOUT, when VOUT is 100mV below the value of VOUT. Guaranteed by characterization., when VOUT is below the of 1.6V 3. VEN = -0.3V to VIN 4. Time needed for VOUT to reach 90% of final value. TYPICAL APPLICATION CIRCUIT VOUT VIN IN OUT CIN 1uF COUT 1uF BCT2050 ON/OFF EN GND FB R1 R2 REV1.0 www.broadchip.com Copyright © BROADCHIP TECHNOLOGY CO., LTD 5 BCT2050 Low Power Low Dropout Regulators Enable Function The BCT2050 features an LDO regulator en-able/disable function. To assure the LDO regulator will switch on; the EN turn on control level must be greater than 1.5 volts. The LDO regulator will go into the shutdown mode when the voltage on the EN pin falls below 0.3 volts. For to protect the system, the BCT2050 have a quick discharge function. If the enable function is not needed in a specific application, it may be tied to VIN to keep the LDO regulator in a continuously on state. Programming the BCT2050 Adjustable LDO regulator The output voltage of the BCT2050 adjustable regulator is programmed using an external resistor divider as show in Figure as below. The output voltage is calculated using equation as below: R1   VOUT= VREF × 1 +   R2  Where: VREF=0.8V typ (the internal reference voltage) Resistors R1 and R2 should be chosen for approximately 50uA divider current. Lower value resistors can be used for improved noise performance, but the solution consumes more power. Higher resistor values should be avoided as leakage current into/out of FB across R1/R2 creates an offset voltage that artificially increases/decreases the feedback voltage and thus erroneously decrease/increases VOUT. Thermal Considerations Thermal protection limits power dissipation in BCT2050. When the operation junction temperature exceeds 150°C, the OTP circuit starts the thermal shutdown function turn the pass element off. The pass element turns on again after the junction temperature cools by 15°C. For continue operation, do not exceed absolute maximum operation junction temperature 150°C. The power dissipation definition in device is: PD = (VIN−VOUT) ×IOUT + VIN×IQ The maximum power dissipation depends on the thermal resistance of IC package, PCB layout, the rate of surroundings airflow and temperature difference between junction to ambient. The maximum power dissipation can be calculated by following formula： PD(MAX) = ( TJ(MAX) − TA ) /θJA Where TJ(MAX) is the maximum operation junction temperature 150°C, TA is the ambient temperature and the θJA is the junction to ambient thermal resistance. For recommended operating conditions specification of BCT2050, where TJ(MAX) is the maximum junction temperature of the die (150°C) and TA is the maximum ambient temperature. The junction to ambient thermal resistance (θJA is layout REV1.0 www.broadchip.com Copyright © BROADCHIP TECHNOLOGY CO., LTD 6 BCT2050 Low Power Low Dropout Regulators dependent) for SOT23-5 package is 260°C/W, on standard JEDEC 51-3 thermal test board. The maximum power dissipation at TA= 25°C can be calculated by following formula: PD(MAX) = (150°C−25°C)/260 = 481mW (SOT23-5) The maximum power dissipation depends on operating ambient temperature for fixed TJ(MAX) and thermal resistance θJA. It is also useful to calculate the junction of temperature of the BCT2050 under a set of specific conditions. In this example let the Input voltage VIN=3.3V, the output current Io=300mA and the case temperature TA=40°C measured by a thermal couple during operation. The power dissipation for the Vo=2.8V of the BCT2050 can be calculated as: PD = (3.3V−2.8V) ×300mA+3.6V×30uA =150.108mW And the junction temperature, TJ, can be calculated as follows: TJ=TA+PD×θJA=40°C+0.15W×260°C/W =40°C+39°C=79°C