50mA Ultra-Low Quiescent Current LDO Linear Regulator EC8841 Features Description The EC8841 series is a positive voltage regulator with high accuracy output voltage and ultra-low quiescent current which is typically 1.0μA. The device is ideal for battery powered handheld equipments which require low quiescent current. The EC8841 contains a bandgap voltage reference, an error amplifier, a P-channel pass transistor, and a resistor-divider for setting output voltage. The output voltage is fixed with high accuracy by advanced trimming technology. The EC8841 has been designed to be used with low cost ceramic capacitors and requires a minimum output capacitor of 1.0μF. The devices are available in SOT23-3/5, SOT89 and TO92 packages ● Operating Voltages Range：+2.5V to +18V ● Output Voltages Range：+1.5V to +5.0V with 100mV Increment ● Low Dropout: 800mV @ 50mA ● High Output Voltage Accuracy±2%：Vout ≧2.7V ● Thermal Overload Shutdown Protection ● Low ESR Capacitor Compatible ● SOT23-3, SOT23-5, SOT89, TO92 Packages ● RoHS Compliant and 100% Lead (Pb)-Free and Green (Halogen Free with Commercial Standard) Applications Battery powered equipments Hand-Held Electronics Portable Communication Devices Wireless Communication systems Precision Voltage Reference Simplified Application Circuit SOT89 E-CMOS Corp. (www.ecmos.com.tw) SOT23 Series Page 1 of 12 3I03N Rev. P001 50mA Ultra-Low Quiescent Current LDO Linear Regulator EC8841 Ordering Information EC8841 XX XX X R R:Tape & Reel Circuit Type Pin Type: SOT89:L/Y Output Voltage(exam): VOUT= 1.8V= 18 VOUT= 2.8V= 28 VOUT= 3.3V= 33 VOUT= 5.0V= 50 Package Part Number SOT23-3 EC8841XXB1NR SOT23-5 EC8841XXB2NR EC8841XXB6LR( Pin Type：L) SOT89 EC8841XXB6YR(Pin Type：Y) TO92 EC8841XXA6NR N：Normal Package Type： B1=SOT23-3 B2=SOT23-5 B6= SOT89 3L A6=TO92-3L Marking 8841V TTTTT 8841V TTTTT 8841V TTTTL 8841V TTTTY 8841V TTTTT Marking Information Product part ： 8841 V is the output voltage of production. Example: 8=1.5V;A=1.8V,K=2.8V; M=3.0V;Q=3.3V.Z=5.0V TTTTT：Lot No Pin Assignment & Pin Description Pin Number Pin Name Pin Description 1 GND GND Pin 2 VOUT Output Pin 3 VIN Power Input (SOT23-3) Pin Number Pin Name Pin Description 1 GND GND Pin 2 VIN Power Input 3 VOUT Output Pin 4 NC No Connection 5 NC No Connection (SOT23-5) E-CMOS Corp. (www.ecmos.com.tw) Page 2 of 12 3I03N Rev. P001 50mA Ultra-Low Quiescent Current LDO Linear Regulator EC8841 Pin Assignment & Pin Description Pin Number SOT89 SOT89 (Pin Type L) (Pin Type Y) Pin Name Pin Description 1 1 GND GND Pin 2 3 VIN Power Input 3 2 VOUT Output Pin Pin Number Pin Name Pin Description 1 GND GND Pin 2 VIN Power Input 3 VOUT Output Pin (TO92) Absolute Maximum Rating Parameter Input Voltage VIN to GND Output Current Limit, I(LIMIT) Symbol Value Units VIN 20 V 100 mA 350 mW 350 mW 550 mW 550 mW IOUT SOT23-3 SOT23-5 Power Dissipation SOT89 PD TO92 Operating Ambient Temperature TOPR -40 to+125 °C Storage Temperature Range TSTG -55 to +150 °C — +260 °C Lead Temperature (Soldering, 10sec) Note: *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 3 of 12 3I03N Rev. P001 50mA Ultra-Low Quiescent Current LDO Linear Regulator EC8841 Electrical Characteristics (T A=25°C, unless otherwise noted.) Symbol VIN VOUT IMAX IQ VDROP Parameter Test Conditions Input Voltage VIN=VOUT+1.0V, IOUT=1mA, VOUT≦2.6V VOUT* 0.976 VIN=VOUT+1.0V, IOUT=1mA, VOUT≧2.7V VOUT* 0.98 Maximum Load Current Dropout Voltage Typ 2.5 Output Voltage Ground Pin Current Min Max Unit 18 V VOUT* 1.024 VOUT VOUT* 1.02 mA 50 ILOAD=0mA , VIN=VOUT+1.0V 1.0 2.5 µA IOUT=1mA, VOUT=5V 16 20 IOUT=10mA, VOUT=5V 160 200 IOUT=50mA, VOUT=5V 800 1000 0.2 0.3 %/V 0.01 0.02 %/mA ∆VLINE Line Regulation VOUT+1.0V<VIN<12V, IOUT=1mA ∆VLOAD Load Regulation IOUT=0mA to 50mA, △VOUT/ △TA Temperature Characteristic of △VOUT VIN=5.0V, IOUT=10mA,TA=-40℃~125℃ 0.6 Function Block Diagram E-CMOS Corp. (www.ecmos.com.tw) V Page 4 of 12 3I03N Rev. P001 mV mV/℃ 50mA Ultra-Low Quiescent Current LDO Linear Regulator EC8841 APPLICATION CIRCUITS Current Boost Circuit The figure below shows a boost circuit for increasing the output current. Output current 60mA or more can be obtained by this circuit. Where VSET is the preset output voltage of EC8841 and ISS is the quiescent current. Because of the low quiescent current, the resistor values, R1 and R2, can be set as large as several hundreds kΩ to lower the power consumption of the whole system. Constant Current Source The EC8841 Series can be used as a constant current source within allowable current limit. Short-Circuit protection of Tr1 can be implemented by adding the sense resistor RS and the PNP transistor Tr2 as shown below. The output current is obtained by: The current limit of the protection circuit is: Voltage Boost Circuit If the output voltage you need is greater than 5.0V, the circuit in the figure below will increase output voltages easily Dual Supply A dual supply can be constructed with two EC8841 series as show in the figure below. This circuit provides two outputs (5V and 8V) with the EC884130 and the EC884150. As the resistance R lets the quiescent current of IC1 pass. R is unnece-ssary if the minimum output current of IC2 is more than the IC1 quiescent current. D is a protection diode in case VOUT2 becomes larger than VOUT1. The output voltage is obtained by: E-CMOS Corp. (www.ecmos.com.tw) Page 5 of 12 3I03N Rev. P001 50mA Ultra-Low Quiescent Current LDO Linear Regulator EC8841 Detail Description The EC8841 is a low quiescent current LDO linear regulator. It supplies a preset 3.3V, 3.6V and 5.0V output voltages for output current up to 50mA. Other mask options for special output voltages from 1.5V to 5.0V with 100mV increment are also available. As illustrated in function block diagram, it consists of a 1.23V band gap reference, error amplifier, P-channel pass transistor and an internal feedback voltage divider. The 1.23V band gap 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 resistor-divider connected to OUT. Additional blocks include an output current limiter, thermal sensor, and shutdown logic. Internal P-channel Pass Transistor The EC8841 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.PNPbased regulators also waste considerable current in dropout conditions when the pass transistor saturates,and use high base-drive currents under large loads.The EC8841 does not suffer from these problems and consumes only 1.0μA (Typ.) of ground pin current under heavy loads as well as in dropout conditions. Output Voltage Selection The first two digits of part number suffix identify the output voltage(see Ordering Information).For example, the EC884150 has a preset 5.0V output voltage. 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 EC8841 uses a P-channel MOSFET pass transistor,its dropout voltage is a function of drain-tosource on-resistance (RDS(ON))multiplied by the load current. VDROPOUT VIN VOUT RDSON I OUT E-CMOS Corp. (www.ecmos.com.tw) Page 6 of 12 3I03N Rev. P001 50mA Ultra-Low Quiescent Current LDO Linear Regulator EC8841 Typical Operating Characteristics (EC884136A6NR tested, CIN=1.0μF, COUT=1.0μF, TA=+25℃, unless otherwise noted.) E-CMOS Corp. (www.ecmos.com.tw) Page 7 of 12 3I03N Rev. P001 50mA Ultra-Low Quiescent Current LDO Linear Regulator EC8841 Mechanical Dimensions OUTLINE DRAWING SOT23-3 E-CMOS Corp. (www.ecmos.com.tw) Page 8 of 12 3I03N Rev. P001 50mA Ultra-Low Quiescent Current LDO Linear Regulator EC8841 Mechanical Dimensions OUTLINE DRAWING SOT23-5 E-CMOS Corp. (www.ecmos.com.tw) Page 9 of 12 3I03N Rev. P001 50mA Ultra-Low Quiescent Current LDO Linear Regulator EC8841 Mechanical Dimensions OUTLINE DRAWING SOT-89 E-CMOS Corp. (www.ecmos.com.tw) Page 10 of 12 3I03N Rev. P001 50mA Ultra-Low Quiescent Current LDO Linear Regulator EC8841 Mechanical Dimensions OUTLINE DRAWING TO-92 E-CMOS Corp. (www.ecmos.com.tw) Page 11 of 12 3I03N Rev. P001 50mA Ultra-Low Quiescent Current LDO Linear Regulator EC8841 Table 2. Pb-free / Green Process – Package Classification Reflow Temperatures Volume mm³ Volume mm³ Volume mm³ <350 350~2000 ≧2000 <2.5 mm 260 +0°C* 260 +0°C* 260 +0°C* 1.6-2.5 mm 260 +0°C* 250 +0°C* 245 +0°C* ≧2.5 mm 250 +0°C* 245 +0°C* 245 +0°C* Package Thickness Notes： * Tolerance: The device manufacturer/supplier shall assure process compatibility up to and including the stated classification temperature (this means Peak reflow temperature +0°C. For example 260°C+0°C) at the rated MSL level. E-CMOS Corp. (www.ecmos.com.tw) Page 12 of 12 3I03N Rev. P001