ME2206AM6G-N

ME2206 3W High Power White LED ME2206 Description Features The ME2206 is a CMOS BOOST DC-DC  LED Power Efficiency: up to 90% converter that delivers a regulated output current. It  Current Accuracy: ±10% switches at a 1MHz constant frequency (TYP),  Low Start-Up Voltage: 0.9V(ILED＝270mA) using of small value external inductor and ceramic  Low Hold Voltage:0.75V(ILED＝200mA) capacitors.  1MHz Switching Frequency The ME2206 is aimed to be used for driving  Uses small, Low Profile External Components loads up to 1A from a one or two-cell alkaline  Low RDS(ON) : 100mΩ (TYP.) battery (according to specific package). Additionally,  Open LED Protection it can limit the LED current by the sense resistor  Over Temperature Protection connected between the feedback pin (FB) and  Pb-Free Package ground. A low 95mV feedback voltage reduces the power loss in the Rs for better efficiency. During the shutdown mode, the current consumption is reduced to less than 1uA. Applications Package  White LED Torch (Flashlight)  6-pin ：SOT23-6  White LED Camera Flash  5-pin ：SOT89-5  DSC(Digital Still Camera)Flash  Cellular Camera Phone Flash  PDA Camera Flash  Camcorder Torch(Flashlight) Lamp V07 www.microne.com.cn Page 1 of 9 ME2206 Typical Application Circuit Rs Resistor Value Selection： TYP.（mΩ） 127 270 ILED (mA) 750 351.8 Precautions： ME2206 is only applicable to two battery-driven 1W or 3W white LED, ME2206A a battery can drive 1W or 3W white LED. Selection Guide ME 22 06 X XX G Environment mark Package M6：SOT23-6 P5：SOT89-5 Function Product Type Product Series Microne V07 product series product description ME2206M6G two battery-driven；package：SOT23-6 ME2206P5G two battery-driven；package：SOT89-5 ME2206AM6G a battery-driven；package：SOT23-6 ME2206AP5G a battery-driven；package：SOT89-5 www.microne.com.cn Page 2 of 9 ME2206 Pin Configuration 6 5 4 1 2 3 5 4 1 2 SOT23-6 3 SOT89-5 Pin Assignment Pin Number Name Function 4 SW Switch 2 2 GND Ground 3 3 FB Feedback 4 1 SHDN Shut Down 5 5 VOUT Output 6 / VIN Input SOT23-6 SOT89-5 1 Block Diagram 95mv Vref Error AMP FB SHDN PWM VOUT OSC GND slope compensation SW VIN Sampling inductor current V07 Limit current DRV Vref www.microne.com.cn Page 3 of 9 ME2206 Absolute Maximum Ratings Parameter Symbol Ratings Units Input Voltage VIN －0.3V~6V V SW Pin Voltage SW －0.3V~6V V SHDN, FB Pin Voltage SHDN/FB －0.3V~6V V Operating Temperature Range TOPR －40℃~85℃ ℃ Storage Temperature Range TSTG －55℃~125℃ ℃ Lead Temperature (Soldering, 10 sec) TL 260℃ ℃ SOT23-6 PD 400 mW SOT89-5 PD 500 mW Internal Power Dissipation Electrical Characteristic T=25℃，Vin＝2.4V，ILED ＝750mA，VSHDN ＝Vin，L=2.2uH，Cin＝Cout＝10uF，unless otherwise noted. Parameter Symbol Condition Min Input Voltage Range Vin 0.9 Feedback Voltage VFB 85 Start-up Voltage VSTART Hold Voltage VHOLD Oscillator Frequency FOSC SHDN Input High VSH Vin＝1.8V SHDN Input Low Over Temperature Shutdown Over Temperature Hysteresis Maximum Output Current Range VSL Vin＝1.8V Vin：0V～3V ILED ＝270mA Vin：3V～0V ILED ＝750mA～200mA Typ 95 Max Unit VF-0.2 V 105 mV 0.9 V 0.75 V 1 MHz 1.0 V 0.4 OTS 150 OTH 15 IMAX ℃ ℃ 750 ILED ＝0mA，Vout＝3.4V， Device Switch at 1MHz Shutdown mode Quiescent Current IQ Shutdown Current Switch on Resistance Current Limit ISD RDSON Vout＝3.4V ILIM Vout＝3.4V Efficiency η ILED ＝750mA V mA 1 3 1 mA uA Ω 0.1 2 A 90 % Note: VF for LED forward voltage Operation Principles The ME2206 could work at low input voltage condition. The ME2206 is supplied by VOUT. When the output voltage is lower than 2V, the internal low voltage OSC starts work. After the VOUT voltage is higher than 2V, the circuit loop began to work normally. According to the sampled feedback voltage at FB pin, the chip adjusts the Duty, to make the output constant current. The ME2206 has the limiting inductor’s current function, and the limiting current is 2A. When the chip’s temperature is higher than 150℃, it enters the OTP function. And the chip V07 www.microne.com.cn Page 4 of 9 ME2206 stops work. When the chip’s temperature down to135℃ , the ME2206 works again. If the load open, The ME2206 enters load open protection state. Then the VOUT will up to 5V and the ME2206 stops working. After the VOUT down to 4.6V, ME2206 began working again. External Parts Selection 1. Inductor The recommended L value of the ME2206 Series is 2.2μH. The inductance (L) has a strong influence on the maximum output current (IOUT) and efficiency (η). The inductor peak current (IPK) increases when L is decreased, which improves the circuit stability and increases the I OUT users can obtain. The ME2206 can use small value inductors due to its switching frequency of 1MHz. User could accord to applications to choose the value of inductor in range of 2.2μH to 4.7μH. The inductor should have low DCR (DC resistance) to minimize the I2R power loss, and it requires a current rating of 2A to handle the peak inductor current without saturating. 2. Diode It’s necessary to use a Schottky diode rated at 2A with the ME2206. Using a Schottky diode with a lower forward voltage drop is better to improve the power LED efficiency, and its reverse breakdown voltage should be greater than the output voltage. 3. Input capacitor (CIN) and output capacitor (COUT) To improve efficiency, an input capacitor (CIN) lowers the power supply impedance and averages the input current. For better input decoupling, Low ESR (equivalent series resistance) capacitors should be used at the input. At least 10uF input capacitor is recommended for most applications. An output capacitor (COUT), which is used to smooth the output voltage, requires a capacitance larger than that of the step-down type because the current is intermittently supplied from the input to the output side in the step-up type. A minimum output ceramic capacitor value of 10uF is recommended for the ME2206. However, a higher capacitance is recommended if the output voltage is high or the load current is large. 10uF~22uF output capacitor is recommended for higher power applications. 4. LED Current Setting The LED current is set by the single external Rs resistor connected to the FB pin as shown in the typical application circuit. The typical FB reference is internally regulated to 95mV. The LED current is 95mV/Rs. It’s recommended to use a 1% or better precision resistor for the better LED current accuracy. The formula and table for Rs selection are shown as follows: V07 www.microne.com.cn Page 5 of 9 ME2206 Rs=95mV/ILED Standard Value(Ω) ILED(mA) 0.18 528 0.15 633 0.12 792 0.10 950 5. PCB Layout Guidelines The input capacitor and output capacitor should be placed respectively as close as possible to the input pin and out pin of the IC; the inductor and schottky diode should be placed as close as possible to the switch pin by using wide and short traces for the main current path; the current sense resistor should be placed as close as possible between the GND pin and FB pin. Typical Performance Characteristics T=25℃，L=2.2uH，Cin＝Cout＝10uF，unless otherwise noted. V07 www.microne.com.cn Page 6 of 9 ME2206 Packaging Information  Package type：SOT23-6 Millimeters DIM Inches Min Max Min Max A 1.05 1.45 0.0413 0.0571 A1 0 0.15 0.0000 0.0059 A2 0.9 1.3 0.0354 0.0512 A3 0.55 0.75 0.0217 0.0295 b 0.25 0.5 0.0098 0.0197 c 0.1 0.25 0.0039 0.0098 D 2.7 3.12 0.1063 0.1228 e1 1.9(TYP) 0.0748(TYP) E 2.6 3.1 0.1024 0.1220 E1 1.4 1.8 0.0551 0.0709 e 0.95(TYP) 0.0374(TYP) L 0.25 0.6 0.0098 0.0236 θ 0 8° 0.0000 8° c1 0.2(TYP) V07 0.0079(TYP) www.microne.com.cn Page 7 of 9 ME2206  Package type：SOT89-5 Millimeters DIM Inches Min Max Min Max A 1.4 1.6 0.0551 0.0630 b 0.32 0.52 0.0126 0.0205 b1 0.38 0.58 0.0150 0.0228 c 0.35 0.47 0.0138 0.0185 D 4.4 4.6 0.1732 0.1811 D1 1.55(TYP) 0.061(TYP) e1 3(TYP) 0.1181(TYP) E 2.3 2.6 0.0906 0.1023 E1 3.94 4.4 0.1551 0.1732 e 1.5(TYP) L 0.8 V07 0.0591(TYP) 1.2 www.microne.com.cn 0.0315 0.0472 Page 8 of 9 ME2206      The information described herein is subject to change without notice. Nanjing Micro One Electronics Inc is not responsible for any problems caused by circuits or diagrams described herein whose related industrial properties, patents, or other rights belong to third parties. The application circuit examples explain typical applications of the products, and do not guarantee the success of any specific mass-production design. Use of the information described herein for other purposes and/or reproduction or copying without the express permission of Nanjing Micro One Electronics Inc is strictly prohibited. The products described herein cannot be used as part of any device or equipment affecting the human body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus installed in airplanes and other vehicles, without prior written permission of Nanjing Micro One Electronics Inc. Although Nanjing Micro One Electronics Inc exerts the greatest possible effort to ensure high quality and reliability, the failure or malfunction of semiconductor products may occur. The user of these products should therefore give thorough consideration to safety design, including redundancy, fire-prevention measures, and malfunction prevention, to prevent any accidents, fires, or community damage that may ensue. V07 www.microne.com.cn Page 9 of 9