300mA 2CH Low Dropout Voltage Linear Regulators EC3121 General Description Features The EC3121 is a low noise and high accuracy, Input Voltage Range: 2.5V to 6.0V high ripple rejection ratio, low dropout, dual CMOS Varied Fixed Output Voltage Combinations LDO voltage regulators with enable function. The EN 150mV Dropout at 100mA Output Current (VOUT≧2.8V) function allows the output of each regulator to be turned off independently, resulting in greatly reduced Low Quiescent Current power consumption. Standby Current ：1uA(Typ.) Current Limit and Short Current Protections The current limit of EC3121 is over 350mA per Fast Transient Response channel and also operates as a short protection for Low ESR Capacitor Compatible(X7R,X5R) the output current limiter. The output voltage for each Available in the 6-Pin Pb-Free SOT23-6L Packages regulator is set independently by metal trimming. The EC3121 comes with low design cost and outstanding output stability and its compatibility of working with undoubted. low This ESR high ceramic level capacitors output stability is is maintained even during frequent load fluctuations, due to the excellent transient response performance and high PSRR achieved across a broad range of frequency, so these ICs are suitable for hand-held communication equipment power supply. Function Block Diagram E-CMOS Corp. (www.ecmos.com.tw) Page 1 of 7 5D14N-Rev.F004 300mA 2CH Low Dropout Voltage Linear Regulators EC3121 Ordering Information MD：2.7V+1.8V(Vout1+Vout2) D7：1.8V+1.2V(Vout1+ Vout2) DS：1.8V+3.3V(Vout1+Vout2) 7D：1.2V+1.8V(Vout1+ Vout2) 7S：1.2V+3.3V(Vout1+Vout2) DM：1.8V+2.7V(Vout1+Vout2) DN：1.8V+2.8V(Vout1+Vout2) Marking Information Device Marking Information EC3121VVB3R 3121 VVYW Package Type SOT23-6L Remarks 1. 2. 3. VV：Output Voltage(Ex：AN：1.5V+2.8V;DN：1.8V+2.8V) Y：Year code(D=2013;E=2014;F=2015…) W ：Week Code(The big character of A~Z is for the week of 1~26, and small a~z is for the week of 27~52.) Pin Configurations E-CMOS Corp. (www.ecmos.com.tw) Page 2 of 7 5D14N-Rev.F004 300mA 2CH Low Dropout Voltage Linear Regulators EC3121 Absolute Maximum Ratings (Note1) Power Input Voltage (VIN)： (GND-0.3)~6V Enable Voltage (VEN1/VEN2)： (GND-0.3)~VIN Output Voltage(VOUT1+VOUT2) (GND-0.3)~VIN Storage Temperature Range(TSTG)： -40℃ to 150℃ Thermal Information(Note2)： Thermal Resistance Junction to Ambient(JA) SOT23-6L 250°C/W Junction to Case(θJC) SOT23-6L 180℃/W Power Dissipation, PD @ TA=25°C (Note 3) SOT23-6L 250mW Recommended Operating Conditions(Note 4) Operating Junction Temperature Range(T J)： -40℃ to +150℃ Operating Ambient Temperature Range(T OPA)： -40℃ to +85℃ Note 1:Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. 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 remain possibility to affect device reliability. Note 2:Thermal Resistance is specified with approximately 1 square of 1 oz copper. Note 3:Thermal Resistance is specified with the component mounted on a low effective thermal conductivity test board in free air at TA=25°C. Note 4:The device is not guaranteed to function outside its operating conditions. E-CMOS Corp. (www.ecmos.com.tw) Page 3 of 7 5D14N-Rev.F004 300mA 2CH Low Dropout Voltage Linear Regulators EC3121 Electrical Characteristics (Unless otherwise noted , TA=25°C) Symbol Parameters VIN Input Voltage Condition Min Typ Max Units 2.5 5.5 V -2 2 % -0.04 0.04 V Output Voltage Accuracy IOUT=1mA,VIN=5V VOUT>2.0V IOUT=1mA,VIN=5V VOUT≦2.0V ICC Quiescent Current IOUT1,OUT2=0mA,VIN=5V 60 100 uA IOUT=0.2A,VO=VO-2%,VOUT=1.5V 100 1200 mV VDROP Dropout Voltage(Note 5) IOUT=0.2A,VO=VO-2%,VOUT=1.8V 700 900 mV IOUT=0.2A,VO=VO-2%,VOUT>2.5V 300 400 mV △VOUT ISC Short Circuit Current VOUT<1.0V,each channel 150 △VLINE Line Regulation IOUT=1mA,VIN=VOUT+1V to 6.0V 0.2 0.3 %/V △VLOAD Load Regulation IOUT=1~100mA,VIN=VOUT+1V 0.01 0.03 %/mA Ripple Rejection f=10kHz, Ripple 0.5VP-P, VOUT>1.7V,VIN-VOUT=1.0V VOUT≦1.7V,VIN-VOUT=1.2V IOUT=10mA 65 dB IOUT=1mA,-40℃≦TJ≦85℃ ±100 ppm/℃ PSRR IEN Output Voltage Temperature Coefficient EN Input Voltage “H” EN Input Voltage “L” Enable Pull-high Current ISD △VOUT/△T VENH VENL mA 1.2 V 0.6 V VEN1,2=0V 1 2 uA Shutdown Current IOUT1,2=0mA, VIN=5V,VEN1,2=0V 2 4 uA eN Output Noise BW=10Hz to 100kHz,Co=1uF 100 uVrms RLOW On Resistance for AutoDischarge VEN=0V 60 Ω Note 5: Dropout voltage is tested by reducing input voltage until the output drops 2% below its nominal value. E-CMOS Corp. (www.ecmos.com.tw) Page 4 of 7 5D14N-Rev.F004 300mA 2CH Low Dropout Voltage Linear Regulators EC3121 Typical Application Circuit Application Information The EC3121 requires input and output decoupling capacitors. The device is specifically designed for portable applications requiring minimum board space and smallest components. These capacitors must be correctly selected for good performance (see Capacitor Characteristics Section). Please note that linear regulators with a low dropout voltage have high internal loop gains which require care in guarding against oscillation caused by insufficient decoupling capacitance. Input Capacitor An input capacitance of 1µF is required space between input pin and ground pin directly (the amount of the capacitance may be increased without limit).The input capacitor must be located less than 1cm from the device to assure input stability. A lower ESR capacitor allows the use of less capacitance, while higher ESR type (like aluminum electrolytic)requires more capacitance.Capacitor types (aluminum, ceramic and tantalum) can be mixed in parallel, but the total equivalent input capacitance ESR must be defined as above to stable operation. There are no requirements for the ESR on the input capacitor, but tolerance and temperature coefficient must be considered when selecting the capacitor to ensure the capacitance will be 1µF over the entire operating temperature range. E-CMOS Corp. (www.ecmos.com.tw) Page 5 of 7 5D14N-Rev.F004 300mA 2CH Low Dropout Voltage Linear Regulators EC3121 Output Capacitor The EC3121 is designed specifically to work with very small ceramic output capacitors. A ceramic capacitor (temperature characteristics X7R, X5R) in 1µF is suitable for the EC3121 application.The recommended minimum capacitance for the device is 1µF(X5R or X7R dielectric ceramic), between VOUT and GND for stability, but it may be increased without limit. Higher capacitance values help to improve transient. The output capacitor's ESR is critical because it forms a zero to provide phase lead which is required for loop stability. Thermal Considerations The EC3121 series can provide a current of up to 300mA/channel over the full operating junction temperature range. However, the maximum output current must be debated at higher ambient temperature to ensure the junction temperature does not exceed 125°C. With all possible conditions, the junction temperature must be within the range specified under operating conditions. Power dissipation can be calculated based on the output current and the voltage drop across regulator. E-CMOS Corp. (www.ecmos.com.tw) Page 6 of 7 5D14N-Rev.F004 300mA 2CH Low Dropout Voltage Linear Regulators EC3121 Package Dimension OUTLINE DRAWING SOT23-6L E-CMOS Corp. (www.ecmos.com.tw) Page 7 of 7 5D14N-Rev.F004