EC8841 E-CMOS | Alldatasheet
Document overview
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Technical content
Features
- 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 E lectronics Portable Commun ication Devices Wireless Communication systems Precision Voltage Reference Simplified Application Circuit SOT89 SOT23 Series
EC8841 50mA Ultra-Low Quiescent Current LDO Linear Regulator Pin Type: SOT89:L/Y N：Normal R:Tape & Reel Package Type： B1=SOT23-3 B2=SOT23-5 B6= SOT89 3L A6=TO92-3L Output Voltage(exam): VOUT= 1.8V= 18 VOUT= 2. 8V= 2 8 VOUT= 3.3V= 33 VOUT= 5.0V= 50
Ordering Information
Package Part Number Marking Marking Information SOT23-3 EC8841XXB1NR 8841V TTTTT Product part ： 8841 V is the output voltage of production. Example: M=3.0V;Q=3.3V.Z=5.0V TTTTT：Lot No SOT23-5 EC8841XXB2NR 8841V TTTTT SOT89 EC8841XXB6LR( Pin Type：L) 8841V TTTTL EC8841XXB6YR(Pin Type：Y) 8841V TTTTY TO92 EC8841XXA6NR 8841V TTTTT Pin Assignment & Pin Description Pin Number (SOT23-3) Pin Name Pin Description
1 GND GND Pin
2 VOUT Output Pin
3 VIN Power Input
(SOT23-5) Pin Name Pin Description
2 VIN Power Input
3 VOUT Output Pin
4 NC No Connection
5 NC No Connection
EC8841 50mA Ultra-Low Quiescent Current LDO Linear Regulator Pin Assignment & Pin Description Absolute Maximum Rating Parameter Symbol Value Units Input Voltage VIN to GND VIN 20 V Output Current Limit, I(LIMIT) IOUT 100 mA Power Dissipation SOT23-3 PD 350 mW SOT23-5 350 mW SOT89 550 mW TO92 550 mW Operating Ambient Temperature TOPR -40 to+125 °C Storage Temperature Range TSTG -55 to +150 °C Lead Temperature (Soldering, 10sec) — +260 °C 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. Pin Number Pin Name Pin Description SOT89 (Pin Type L) SOT89 (Pin Type Y) 1 1 GND GND Pin 2 3 VIN Power Input 3 2 VOUT Output Pin Pin Number (TO92) Pin Name Pin Description
EC8841 50mA Ultra-Low Quiescent Current LDO Linear Regulator
Electrical Characteristics
(TA=25°C, unless otherwise noted.) Function Block Diagram Symbol Parameter Test Conditions Min Typ Max Unit VIN Input Voltage 2.5 18 V VOUT Output Voltage VIN=VOUT+1.0V, IOUT=1mA, VOUT≦2.6V VOUT* 0.976 VOUT VOUT* 1.024 V VIN=VOUT+1.0V, IOUT=1mA, VOUT≧2.7V VOUT* 0.98 VOUT* 1.02 IMAX Maximum Load Current 50 mA IQ Ground Pin Current ILOAD=0mA , VIN=VOUT+1.0V 1.0 2.5 µA VDROP Dropout Voltage IOUT=1mA, VOUT=5V 16 20 mV IOUT=10mA, VOUT=5V 160 200 IOUT=50mA, VOUT=5V 800 1000 ∆VLINE Line Regulation VOUT+1.0V<VIN<12V, IOUT=1mA 0.2 0.3 %/V ∆VLOAD Load Regulation IOUT=0mA to 50mA, 0.01 0.02 %/mA △VOUT/ △TA Temperature Characteristic of △VOUT VIN=5.0V, IOUT=10mA,TA=-40℃~125℃ 0.6 mV/℃
EC8841 50mA Ultra-Low Quiescent Current LDO Linear Regulator 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. Short-Circuit protection of Tr1 can be implemented by adding the sense resistor RS and the PNP transistor Tr2 as shown below. 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 The output voltage is obtained by: 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. The output current is obtained by: 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.
EC8841 50mA Ultra-Low Quiescent Current LDO Linear Regulator 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. 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 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 iden tify 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-to- source on-resistance (RDS(ON))multiplied by the load current. VDROPOUT VIN VOUT RDSON I OUT
EC8841 50mA Ultra-Low Quiescent Current LDO Linear Regulator Typical Operating Characteristics (EC884136A6NR tested, CIN=1.0μF, COUT=1.0μF, TA=+25℃, unless otherwise noted.)
EC8841 50mA Ultra-Low Quiescent Current LDO Linear Regulator Mechanical Dimensions OUTLINE DRAWING SOT23-3
EC8841 50mA Ultra-Low Quiescent Current LDO Linear Regulator Mechanical Dimensions OUTLINE DRAWING SOT23-5
EC8841 50mA Ultra-Low Quiescent Current LDO Linear Regulator Mechanical Dimensions OUTLINE DRAWING SOT-89
EC8841 50mA Ultra-Low Quiescent Current LDO Linear Regulator Mechanical Dimensions OUTLINE DRAWING TO-92
Table 2. Pb-free / Green Process – Package Classification Reflow Temperatures