EC8815 1.5A Fixed Voltage LDO Linear Regulator General Description Features The EC8815 series is a CMOS low-dropout linear regulator that operates in the input voltage range from +2.4V to +7.0V and delivers 1.5A output current. The EC8815 is available fixed output voltage type is preset at an internally trimmed voltage 1.8V, 2.5V, or 3.3V. Other options 1.0V, 1.2V, 1.5V, 2.85V, 3.0V and 3.6V are available by special order only. The EC8815 consists of a 0.95V bandgap reference, an error amplifier, and a P-channel pass transistor. Other features include short-circuit protection and thermal shutdown protection. The EC8815 series devices are available in SOT-223,TO-252, and TO-263 packages. Applications Active SCSI Terminators High Efficiency Linear Regulators Monitor Microprocessors Low Voltage Micro-Controllers Post Regulator for Switching Power Operating Voltage Range：+2.4V to +7.0V Output Voltages：+1.0V to +5.0V (0.1V Step) Maximum Output Current：1.5A Dropout Voltage：900mV @ 1.5A(Typ.) 35 uS Fast Response when Power-on Low Current Consumption：40µA (Typ.) ±2% Output Voltage Accuracy, VOUT≧1.8V Low ESR Capacitor Compatible High Ripple Rejection：55 dB (Typ.) Output Current Limit Protection：2.0A (Typ.) Short Circuit Protection：1.0A (Typ.) Thermal Overload Shutdown Protection SOT-223, TO-252 and TO-263 Packages RoHS Compliant and 100% Green (Halogen Free with Commercial Standard) Simplified Application Circuit E-CMOS Corp. (www.ecmos.com.tw) Page 1 of 10 3I06N Rev. F001 EC8815 1.5A Fixed Voltage LDO Linear Regulator Ordering Information Vout Code： 10=1.0V,12=1.2V, 15=1.5V,18=1.8V, 25=2.5V, 33=3.3V Package Code： SOT -223 = B7 TO-252 = A4 Pin name Code : SOT-223 = J ‘ G ‘ X TO-252 = P ‘ R Lead Free Code： G：Green (Halogen Free with Commercial Standard) Output Voltage Accuracy： 2：±2% TO-263=A8 TO-263=Q ’ S Note： The difference between “J”, “G” & “X” type and “P” & “R” type and “Q” & “S” please refer to ”Pin Description”. Pin Description Part NO. SOT-223 Pin Symbol Pin Description 3 VIN Regulator Input Pin. 2 2 GND Ground Pin. 3 1 VOUT Regulator Output Pin Symbol Pin Description SOT-223(J) SOT-223(G) SOT-223(X) 3 1 1 2 Part NO. TO-252 E-CMOS Corp. (www.ecmos.com.tw) Pin TO-252 (P) TO-252 (R) 1 3 VIN Regulator Input Pin. 2 1 GND Ground Pin. 3 2 VOUT Regulator Output Pin Page 2 of 10 3I06N Rev. F001 EC8815 1.5A Fixed Voltage LDO Linear Regulator Pin Description Part NO. TO-263 Pin Symbol Pin Description 3 VIN Regulator Input Pin. 2 1 GND Ground Pin. 3 2 VOUT Regulator Output Pin TO-263 (Q) TO-263 (S) 1 Package Marking Information SOT-223 (Top View) TO-252 (Top View) TO-263 (Top View) Top Point Represents Products Series Mark Product Series Top Point Part No.：EC8815 1 、○ 2 、○ 3 、○ 4 、○ 5 Represents Products Series ○ Mark Description 1 、○ 2 ○ Voltage Voltage Code 3 ○ J, G, X, P, R,Q,S Pin Name Code 4 ○ G Green Code 5 ○ Accuracy 2(±2%) E-CMOS Corp. (www.ecmos.com.tw) Page 3 of 10 EC8815-9K09N EC8815 1.5A Fixed Voltage LDO Linear Regulator 6 、○ 7 Represents Production Date Code ○ 6 Year 16 bit code „ 08 = 8‟09 = 9‟10 = A‟11 = B‟ 12 = C….16 = F ○ 7 Weekly 1 ~ 26 = A ~ Z‟ 27 ~ 52 = a ~ z ○ Example: Part No.:EC8815-33JG2 Date Code: Ba 2011/27 Week Green Package SOT-223 (Top View) Absolute Maximum Ratings Parameter Symbol Ratings Units Input Voltage VIN to GND VIN 9.0 V Output Current Limit, I(LIMIT) IOUT 2.0 A TJ +155 °C 155 85 60 900 1200 1670 °C/W °C/W °C/W Junction Temperature Thermal Resistance Power Dissipation SOT-223 TO-252 TO-263 SOT-223 TO-252 TO-263 θJA PD mW Operating Ambient Temperature TOPR -40~+85 °C Storage Temperature TSTG -55~+150 °C +260 °C Lead Temperature (soldering, 10sec) Note： The power dissipation values are based on the condition that junction temperature TJ and ambient temperature TA difference is 100°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. E-CMOS Corp. (www.ecmos.com.tw) Page 4 of 10 3I06N Rev. F001 EC8815 1.5A Fixed Voltage LDO Linear Regulator Electrical Characteristics (VIN=5V, TA=25°C, unless otherwise noted.) Symbol VIN VOUT Parameter Max Unit 2.4 7.0 V VIN = VOUT+1.0V, IOUT=1mA, VOUT≧1.8V -1% -2% +1% +2% V VIN = VOUT+1.0V, IOUT=1mA, VOUT＜1.8V, VIN＞2.4V -35 +35 mV 1.5 A Input Voltage Output Voltage IMAX Output Current(see note *1) ILIMIT Current Limit VDROP Test Conditions Min Typ VOUT 1.8 A IOUT= 100mA, VOUT＞2.4V 30 45 mV IOUT= 500mA, VOUT＞2.4V 230 350 mV IOUT= 900mA, VOUT＞2.4V 500 750 mV IOUT= 1500mA, VOUT＞2.4V 900 1350 mV Dropout Voltage ∆VLINE Line Regulation VOUT+1.0V≦VIN≦7.0V, IOUT=1mA For Fixed Voltage Type 0.2 0.3 %/V ∆VLOAD Load Regulation VIN=VOUT+1V, 1mA≦IOUT≦100mA 0.01 0.02 %/mA IQ Ground Pin Current ILOAD=0mA to 1.5A, VIN = VOUT+1.0V 40 65 µA ISC Short Circuit Current PSRR 1.0 A Ripple Rejection IOUT=30mA, F=1KHz, COUT=10µF 55 dB eN Output Noise IOUT=100mA , F=1KHz, COUT=10µF 40 µV(rms) TSD Thermal Shutdown Temperature 155 °C THYS Thermal Shutdown Hysteresis 20 °C Note： Measured using a double sided board with 1” x 2” square inches of copper area connected to the GND pins for “heat spreading”. E-CMOS Corp. (www.ecmos.com.tw) Page 5 of 10 EC8815-9K09N EC8815 1.5A Fixed Voltage LDO Linear Regulator EC8815 Function Block Diagram Detail Description The EC8815 is a CMOS low-dropout linear regulator. The device provides preset 1.8V, 2.5V and 3.3V output voltages for output current up to 1.5A. As illustrated in function block diagram, it consists of a 0.95V band-gap reference, an error amplifier, a P-channel pass transistor and an internal feedback voltage divider. The band-gap reference voltage 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, thermal sensor, and shutdown logic. Internal P-channel Pass Transistor The EC8815 features a P-channel MOSFET pass transistor. Unlike similar designs using PNP pass transistors, P-channel MOSFET require no base drive, which reduces quiescent current. PNP-bas- ed regulators also waste considerable current in dropout when the pass transistor saturates, and use high base-drive currents under large loads. The EC8815 does not suffer from these problems and consumes only 60μA (Typ.) of current consum-ption under heavy loads as well as in dropout conditions. Output Voltage Selection For voltage type of EC8815, the output voltage is preset at an internally trimmed voltage. The first two digits of part number suffix identify the output voltage (see Ordering Information). For example, the EC8815-33 has a preset 3.3V output voltage. Current Limit The EC8815 also includes a fold back current limiter. It monitors and controls the pass transis- tor‟s gate voltage, estimates the output current, and limits the output current within 2.0A (Typ.). E-CMOS Corp. (www.ecmos.com.tw) Page 6 of 10 3I06N Rev. F001 EC8815 1.5A Fixed Voltage LDO Linear Regulator Thermal Overload Protection Thermal overload protection limits total power dissipation in the EC8815. 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 EC8815 in the event of fault conditions. For continuous operation, the absolute maximum oper- ating junction temperature rating of T J = +125°C should not be exceeded. Operating Region and Power Dissipation Maximum power dissipation of the EC8815 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: P MAX = (TJ一TA ) (TJ一TA ) = θ JC + θCA θA Where (TJ-TA) is the temperature difference between the EC8815 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. Dropout 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 EC8815 use 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. V DROPOUT =V IN 一V OUT = RDS(ON) × I OUT E-CMOS Corp. (www.ecmos.com.tw) Page 7 of 10 EC8815-9K09N EC8815 1.5A Fixed Voltage LDO Linear Regulator Mechanical Dimensions OUTLINE DRAWING SOT-223 Symbols A A1 A2 b b1 C D E1 e e1 E L L2 α E-CMOS Corp. (www.ecmos.com.tw) Page 8 of 10 Millimeters Min Max 1.52 1.80 0.02 0.10 1.50 1.70 0.60 0.80 2.90 3.10 0.24 0.32 6.30 6.80 3.30 3.70 2.30 BSC 4.60 BSC 6.70 7.30 0.90 MIN 0.06 BSC 0° 10° Inches Min Max 0.061 0.071 0.0008 0.0040 0.059 0.067 0.024 0.031 0.114 0.122 0.009 0.013 0.248 0.268 0.130 0.146 0.090 BSC 0.181 BSC 0.264 0.287 0.036 MIN 0.0024 BSC 0° 10° 3I06N Rev. F001 EC8815 1.5A Fixed Voltage LDO Linear Regulator Mechanical Dimensions OUTLINE DRAWING TO-252 Symbols A A1 A2 b C D E E1 e e1 F L L1 L2 L3 L4 H θ E-CMOS Corp. (www.ecmos.com.tw) Page 9 of 10 Millimeters Min Max 2.19 2.38 0.89 1.27 0.00 0.13 0.51 0.89 0.46 0.58 5.97 6.22 6.35 6.73 5.21 5.46 2.28 BSC 3.96 5.18 0.46 0.58 1.40 1.78 2.67 (REF.) 0.64 1.02 1.52 2.03 0.51 BSC 9.40 10.40 0° 8° Inches Min Max 0.086 0.094 0.035 0.050 0.000 0.005 0.020 0.035 0.018 0.023 0.235 0.245 0.250 0.265 0.205 0.0215 0.090 BSC 0.156 0.204 0.018 0.023 0.055 0.070 0.105 (REF.) 0.025 0.040 0.060 0.080 0.020 BSC 0.370 0.410 0° 8° EC8815-9K09N EC8815 1.5A Fixed Voltage LDO Linear Regulator Mechanical Dimensions OUTLINE DRAWING TO-263 E-CMOS Corp. (www.ecmos.com.tw) Page 10 of 10 3I06N Rev. F001