Preliminary Datasheet LP6212A High Efficiency 4A Boost DC/DC Convertor General Description Features The LP6212A is a current mode boost DC-DC Up to 90% efficiency converter. Its PWM circuitry with built-in 4A Current Output to Input Disconnect at Shutdown Mode power MOSFET makes this converter highly efficient. Shut-down current:<1uA Output voltage Up to 10V Internal Compensation, Soft-start component sizes. The LP6212A features automatic 1MHz fixed frequency switching shifting to pulse frequency modulation mode at light High switch on current:4A loads.Highly integration and internal compensation Available in SOT23-6 Package The LP6212A implements a constant frequency 1MHz PWM control scheme. The high frequency PWM operation also saves board space by reducing external network minimizes as 6 external component counts. Optimized operation frequency can meet the requirement of small LC filters value and low operation Typical Application Circuit VIN current with high efficiency. The LP6212A includes under-voltage lockout, current limiting, and thermal overload protection to prevent damage in the event of 2.2uH VOUT C1 22uF C2 22uF LX an output overload. The LP6212A is available in a C3 22pF small SOT23-6 package. VIN EN Order Information FB R1 110K R2 15K GND LP6212A □ □ □ F: Pb-Free Package Type B6: SOT23-6 Applications Battery products Host Products Panel LP6212A-01 Jan.-2017 Marking Information Device LP6212AB6F Marking Package Shipping SOT23-6 3K/REEL Y: Year code. W: Week code. X: Batch numbers. Email: [email protected] www.lowpowersemi.com Page 1 of 7 Preliminary Datasheet LP6212A Functional Pin Description Package Type Pin Configurations NC VIN EN 6 5 4 1 2 3 LX GND FB SOT23-6 Pin Name 1 LX 2 GND Ground Pin. 3 FB Feed back. 4 EN Chip Enable Pin. 5 VIN Voltage Input Pin. 6 NC No Connector. LP6212A-01 Description Switching Pin. Jan.-2017 Email: [email protected] www.lowpowersemi.com Page 2 of 7 Preliminary Datasheet LP6212A Function Block Diagram PWM/PFM CONTROL Soft start VIN 0.6 VREF ERROR COMP. PWM COMPARAT OR CONTROL + - LX DRIVER M1 LOGIC + M FB SLOPE COMPENSATION CURRENT AMP. 1.2MHz OSCILLATOR + RS - EN GND Absolute Maximum Ratings Note 1 Supply Input Voltage ----------------------------------------------------------------------------------------------------- 6V LX Voltage to GND ------------------------------------------------------------------------------------------------------- 12V Other Pin Voltage to GND ----------------------------------------------------------------------------------------------- 6V Maximum Junction Temperature ---------------------------------------------------------------------------------- 150℃ Maximum Soldering Temperature (at leads, 10 sec) -------------------------------------------------------- 260℃ Power Dissipation, PD @ TA = 25℃ SOT23-6 --------------------------------------------------------------------------------------------------------------- 450mW Package Thermal Resistance SOT23-6, θJA ------------------------------------------------------------------------------------------------------- 250℃/W Recommended Operating Conditions Operation Ambient Temperature Range ------------------------------------------------------------- −20℃ to 85℃ Note 1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. LP6212A-01 Jan.-2017 Email: [email protected] www.lowpowersemi.com Page 3 of 7 Preliminary Datasheet LP6212A Electrical Characteristics (VIN=3.4V, VOUT=5V, CIN=22uF, COUT=22uF, L=2.2uH) Parameter Condition Min Typ Max Units Supply Voltage 2.2 5.5 V Output Voltage Range 2.5 10 V Supply Current(Shutdown) VEN=0V, VSW=5V 1 uA Supply Current VFB=0.7V 150 uA 0.612 V 50 nA Feedback Voltage 0.588 Feedback Input Current 0.6 VFB=0.6V Switching Frequency 1200 Maximum Duty Cycle 85 EN Input Low Voltage EN Input High Voltage 1.4 Power MOSFET Current Limit High-side On Resistance LP6212A-01 Jan.-2017 KHz 95 % 0.4 V 5.5 V 4 100 VOUT=3.3V Email: [email protected] A www.lowpowersemi.com mΩ Page 4 of 7 Preliminary Datasheet LP6212A Typical Operating Characteristics VIN=3.3V, VOUT=5V, IOUT=0mA VIN=3.3V, VOUT=5V, IOUT=50mA VIN=3.3V, VOUT=5V, IOUT=100mA VIN=3.3V, VOUT=5V, IOUT=2A Efficiency VS. Output current(Vout=5V) 100% 90% Efficiency(%) 80% 70% 60% 50% Vin=3V Vin=3.3V Vin=3.5V Vin=3.7V Vin=4.2V 40% 30% 20% 10% 0% 0 LP6212A-01 Jan.-2017 500 1000 Iout(mA) Email: [email protected] 1500 2000 www.lowpowersemi.com Page 5 of 7 Preliminary Datasheet LP6212A Operation Information The LP6212A uses a fixed frequency, peak current mode boost regulator architecture to regulate voltage at the feedback pin. At the start of each oscillator cycle the MOSFET is turned on through the control circuitry. To prevent sub-harmonic oscillations at duty cycles greater than 50 percent, a stabilizing ramp is added to the output of the current sense Setting the Output Voltage Set the output voltage by selecting the resistive voltage divider ratio. The voltage divider drops the output voltage to the 0.6V feedback voltage. Use a 100K resistor for R2 of the voltage divider. Determine the high-side resistor R1 by the equation: amplifier and the result is fed into the negative input of the PWM comparator. When this voltage equals VOUT = ( R1 / R2 + 1 ) x VFB VOUT = ( R1 / R2 + 1 ) x 0.6V The output voltage of the error amplifier the power MOSFET is turned off. The voltage at the output of the error amplifier is an amplified version of the difference between the 0.6V bandgap reference voltage and the feedback voltage. In this way the peak current level keeps the output in regulation. If the feedback voltage starts to drop, the output of the error amplifier increases. These results in more current to flow through the power MOSFET, thus increasing the power delivered to the output. TheLP6212A has internal soft start to limit the amount of input current at startup and to also limit the amount of overshoot on the output. LP6212A-01 Jan.-2017 Email: [email protected] www.lowpowersemi.com Page 6 of 7 Preliminary Datasheet LP6212A Packaging Information SOT23-6 LP6212A-01 Jan.-2017 Email: [email protected] www.lowpowersemi.com Page 7 of 7