ME2159AM6G

ME2159 1A Step-Up Current Mode PWM Converter ME2159 General Description Features The ME2159 is a current mode boost DC-DC ● Precision Feedback Reference Voltage: 0.6V converter. Its PWM circuitry with built-in 0.18Ω power ● Reference Voltage accuracy: MOSFET make this regulator highly power efficient. ● Adjustable Output up to 12V The internal compensation network also minimizes ● Internal Fixed PWM frequency: 650KHz as much as 6 external component counts. The ● Internal 0.18Ω ,2A, 16V Power MOSFET non-inverting input of error amplifier connects to a 0.6V ● Shutdown Current: 0.1μA precision reference voltage and internal soft-start ●Over Temperature Protection:165℃ function can reduce the inrush current. ● Package: SOT23-6 Selection Guide ±2% Applications ● Chargers ● LCD Displays ● Digital Cameras ● Handheld Devices ● Portable Products V02 Page 1 of 9 ME2159 Typical Application Pin Configuration Pin information Pin Number Name Function 1 LX Power Switch Output 2 GND Ground 3 FB Feedback 4 EN Chip Enable(Active High) 5 VIN Power Supply 6 NC NC V02 Page 2 of 9 ME2159 Absolute Maximum Ratings Parameter Power supply voltage, VIN voltage at EN、FB Pin Symbal VIN VEN,VFB Rating Unit -0.3～6.0 V -0.3～VIN V voltage at SW Pin VLX -0.3～12 V LX ILX 2100 mA Internal Power Dissipation, （SOT23-6） PD 300 mW Operating Ambient Temperature Topr -40~85 °C Storage Temperature Tstg -40~+150 °C Tsolder 260°C, 10S °C Pin Current Soldering temperature and time Block Diagram V02 Page 3 of 9 ME2159 Electrical Characteristics （VIN = VEN=3.3V, VOUT=5V, C1= C2= 22μF, L=4.7μH, TA =25 °C, unless otherwise noted.） Parameter Symbol Test condition Min Typ. Max Unit 2.5 - 5.5 V System Supply Input Input voltage range Under Voltage Lockout VIN VUVLO UVLO Hysteresis 2.15 V 0.08 V Average Supply Current ISS1 VFB=0.55V, Switching 0.8 1.5 mA Quiescent Current Iss2 VFB=0.66V, No Switching 280 Shutdown Supply Current ISS3 VEN=GND 0.1 5 μA Operation Frequency FOSC VFB=1.0V 0.65 0.8 MHz Maximum Duty Cycle DMAX 90 % Minimum Duty Cycle DMIN 22 % μA Oscillator 0.5 Reference Voltage Reference Voltage VFB 0.588 VIN=2.6V to 4.3V Line Regulation 0.6 0.612 0.03 V %/V Enable Control Enable Voltage VEN 1.5 Shutdown Voltage VEN - V 0.6 V MOSFET On Resistance of Driver RDS (ON) ILX=2A Ω 0.18 Protection OCP Current IOCP Over Temperature Protection OTP OTP Hysteresis OTH V02 2 2.1 A - 165 - °C - 25 - °C Page 4 of 9 ME2159 Typical Performance Characteristics 1、Output Voltage VS. Output Current （Vout =5.0V） 2、Efficiency VS. Output Current（Vout=5.0V） Efficiency VS.Output Current 100 5.1 5.05 5 4.95 4.9 4.85 4.8 VIN=2.5V VIN=4.2V VIN=3.3V 80 Efficiency(%) Output Current(mA) Output Voltage VS.Output Current 60 VIN=2.5V 0 0 200 400 600 800 1000 1200 0 1400 200 （IOUT=10mA） 3、VOUT VS. Input Voltage 800 1000 1200 1400 5 5.5 Average Supply Current VS. Input Voltage 5.1 5.05 5 4.95 4.9 4.85 4.8 4.75 4.7 1.2 Average Supply Current(mA) Output Voltage (V) 600 4、ISS1 VS. Input Voltage Output Voltage VS.Input Voltage 1 0.8 0.6 0.4 0.2 0 2.5 3 3.5 4 4.5 5 2.5 3 5、ISS2 VS. Input Voltage 4.5 Oscillator Frequency(MHz) Oscillator Frequency VS.Input Voltage 320 300 280 260 240 220 3.5 4 6、Oscillator Frequency VS. Input Voltage Quiescent Current VS.Input Voltage 3 3.5 Input Voltage(V) Input Voltage(V) Quiescent Current(uA) 400 Output Current（mA） Output Voltage(V) 4 Input Voltage(V) V02 VIN=4.2V 20 4.75 4.7 2.5 VIN=3.3V 40 4.5 5 5.5 0.9 0.8 0.7 0.6 0.5 0.4 2.5 3 3.5 4 4.2 Input Voltage(V) Page 5 of 9 4.5 ME2159 Function Description Operation The ME2159 is a current mode boost converter. The constant switching frequency is 1MHz and operates with pulse width modulation (PWM). Build-in 16V / 2A MOSFET provides a high output voltage. The control loop architecture is peak current mode control; therefore slope compensation circuit is added to the current signal to allow stable operation for duty cycles larger than 50%. Soft Start Function Soft start circuitry is integrated into ME2159 to avoid inrush current during power on. After the IC is enabled, the output of error amplifier is clamped by the internal soft-start function, which causes PWM pulse width increasing slowly and thus reducing input surge current. Over Temperature Protection (OTP) The ME2159 will turn off the power MOSFET automatically when the internal junction temperature is over 150°C. The power MOSFET wake up when the junction temperature drops 30°C under the OTP threshold temperature. Output Disconnect When power on and the EN pin will be pulled high. The ME2159 start up and operates. The external PMOS is turned on and current through it for output loading. While output loading is increase, output voltage is drop. When the FB pin voltage is under 0.3V, the EN pin sinks 20μA current, the external PMOS will be turn off. The output short condition will be disconnected. Application Information Inductor Selection Inductance value is decided based on different condition. 3.3uH to 4.7μH inductor value is recommended for general application circuit. There are three important inductor specifications, DC resistance, saturation current and core loss. Low DC resistance has better power efficiency. Also, it avoids inductor saturation which will cause circuit system unstable and lower core loss at 1MHz. Capacitor Selection The output capacitor is required to maintain the DC voltage. Low ESR capacitors are preferred to reduce the output voltage ripple. Ceramic capacitor of X5R and X7R are recommended, which have low equivalent series resistance (ESR) and wider operation temperature range. Diode Selection Schottky diodes with fast recovery times and low forward voltages are recommended. Ensure the diode average V02 Page 6 of 9 ME2159 and peak current rating exceed the average output current and peak inductor current. In addition, the diode’s reverse breakdown voltage must exceed the output voltage. Output Voltage Programming The output voltage is set by a resistive voltage divider from the output voltage to FB. The output voltage is: V OUT   0.6  1    R  R  1 2 PCB Layout Check List When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the ME2159. 1. The power traces, consisting of the GND trace, the SW trace and the VIN trace should be kept short, direct and wide. 2. LX、L and D switching node, wide and short trace to reduce EMI. 3. Place CIN near VCC pin as closely as possible to maintain input voltage steady and filter out the pulsing input current. 4. The resistive divider R1and R2 must be connected to FB pin directly as closely as possible. the internal power MOSFETs. 5. FB is a sensitive node. Please keep it away from switching node, LX. 6. The GND of the IC, CIN and COUT should be connected close together directly to a ground plane. V02 Page 7 of 9 ME2159 Package Information Package type:SOT23-6 Unit:mm(inch) Millimeters Inches DIM V02 Min Max Min Max A 0.9 1.45 0.0354 0.0570 A1 0 0.15 0 0.0059 A2 0.9 1.3 0.0354 0.0511 B 0.2 0.5 0.0078 0.0196 C 0.09 0.26 0.0035 0.0102 D 2.7 3.10 0.1062 0.1220 E 2.2 3.2 0.0866 0.1181 E1 1.30 1.80 0.0511 0.0708 e 0.95REF 0.0374REF e1 1.90REF 0.0748REF L 0.10 0.60 0.0039 0.0236 a0 00 300 00 300 Page 8 of 9