Preliminary Datasheet LP3316 1.2MHz,30V/1.4A High Performance, Boost Converter General Description The LP3316 is a 1.2MHz PWM boost switching regulator designed for constant-voltage boost applications. The LP3316 can drive a string of up to 30V. The LP3316 implements a constant frequency 1.2MHz PWM control scheme. The high frequency PWM operation also saves board space by reducing external component sizes. To improve efficiency, the feedback voltage is set to 1250 mV, which reduces the power dissipation in the voltage setting resistor. Highly integration and internal compensation network minimizes as 5 external component counts. Optimized operation frequency can meet the requirement of small LC filters value and low operation current with high efficiency. Features High Efficiency: 95% 1.2MHzFixed-Frequency PWM Operation Maximum Output Voltage up to 30V Guaranteed 13V/400mA Output with 5V input Operating Range : 2.7V to 5.5V Shutdown Supply Current:<1uA Programmable Soft-star Available in SOT23-6/SOT23-5 Package Minimize the External Component RoHS Compliant and 100% Lead (Pb)-Free Applications Panel Bais Voltage supply OLED Backlight driver Notebook Computers Portable Applications MID/PTV Ordering Information LP3316 F: Pb-Free Typical Application Circuit Vin 10uH Pin Configurations C2 4.7uF 1 C1 4.7uF Vout LP3316 6 Vin LX Package: B5: SOT23-5 B6: SOT23-6 SHDN SS 2 4 GND FB (TSOT23-6) 3 C3/NC 100pF 5 C4 33nF Marking information (SOT23-5) Please view website. LP3316– 00 Version1.0 Datasheet Feb.-2010 www.lowpowersemi.com Page 1 of 8 R1 860K R2 100K Preliminary Datasheet LP3316 Functional pin description SOT-23-5 SOT-23-6 Pin Name Pin Function 1 1 LX Switch Pin. Connect this Pin to inductor and catch diode. Minimize the track area to reduce EMI. 2 2 GND Ground Pin 3 3 FB Feedback Reference Voltage Pin. Series connect a resistor between Vout and ground as a voltage sense. The feedback voltage is 1250mV. 4 /SHDN Chip Enable (Active High). Voltage sensing input to trigger the function of over voltage protection. Note that this pin is high impedance. There should be a pull low 100kΩ resistor connected to GND when the control signal is floating. 5 SS Softstar pin. Leave SS open to disable the soft-star function. 6 Vin Supply Input Voltage Pin. Bypass 1uF capacitor to GND to reduce the input noise. 4 5 Function Block Diagram LP3316– 00 Version1.0 Datasheet Feb.-2010 www.lowpowersemi.com Page 2 of 8 Preliminary Datasheet LP3316 Absolute Maximum Ratings Supply Input Voltage---------------------------------------------------------------------------------------------------−0.3V to 6.0V LX Input Voltage ---------------------------------------------------------------------------------------------------------−0.3V to 40V The Other Pins ----------------------------------------------------------------------------------------------------------−0.3V to 5.5V Power Dissipation, PD @ TA = 25°C TSOT-23-5/6-----------------------------------------------------------------------0.455W Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------------ 260°C Operation Temperature Range ---------------------------------------------------------------------------------−40°C to 80°C Storage Temperature Range ----------------------------------------------------------------------------------------−65°C to 150°C Electrical Characteristics Parameter Symbol Test Condition Min Typ. Max Units 6 V System Supply Input Operation voltage Range VDD 2.7 Under Voltage Lock Out VDD 2.2 Supply Current IDD FB=0.2V, Switch 430 550 uA Shut Down Current IDD VEN < 0.4V 0.1 1 uA Line Regulation VIN : 3.0~4.3V 2.4 2.6 V 2 % 1.2 MHz Oscillator Operation Frequency FOSC Maximum Duty Cycle Feedback Voltage 90 % LP3316 1.25 V On Resistance of MOSFET RDS(ON) 0.5 Ω SW Current Limit ILM 1.4 A MOSFET Protection Shut Down Voltage VEN Enable on Voltage VEN LP3316– 00 Version1.0 Datasheet Feb.-2010 0.3 V 1.0 www.lowpowersemi.com V Page 3 of 8 Preliminary Datasheet LP3316 Typical Operating Characteristics LP3316– 00 Version1.0 Datasheet Feb.-2010 www.lowpowersemi.com Page 4 of 8 Preliminary Datasheet LP3316– 00 Version1.0 Datasheet Feb.-2010 www.lowpowersemi.com LP3316 Page 5 of 8 Preliminary Datasheet LP3316 Applications Information Inductor Selection The recommended value of inductor for 30V applications are 4.7 to 22µH. Small size and better efficiency are the major concerns for portable device, such as LP3316 used for mobile phone. The inductor should have low core loss at 1.2MHz and low DCR for better efficiency. To avoid inductor saturation current rating should be considered. LP3316– 00 Version1.0 Datasheet Feb.-2010 www.lowpowersemi.com Page 6 of 8 Preliminary Datasheet LP3316 Packing information LP3316– 00 Version1.0 Datasheet Feb.-2010 www.lowpowersemi.com Page 7 of 8 Preliminary Datasheet LP3316– 00 Version1.0 Datasheet Feb.-2010 www.lowpowersemi.com LP3316 Page 8 of 8