Preliminary Datasheet LP3211 High Performance PWM DC/DC Regulated General Description Features The LP3211 is a 1.2MHz high performance PWM DC/DC converter that produces a regulated 5V output. No external inductor and diode is required for operation. The operating voltage range is 2.8V to Vout. Internal soft-start circuitry effectively reduces the in-rush current both while start-up and mode change. The LP3211 features very low quiescent current, over current protection and short circuit protection. The LP3211 is available in SOT-23-6 package. 280mA Output current No Inductor and diode Soft Start Function Built-In Short-Circuit Protection Built-in Thermal Protection Over Current Protection Function IQ<1uA in Shutdown SOT23-6 Package RoHS Compliant and 100% Lead (Pb)-Free Typical Application Circuit Order Information Vin F: Pb-Free Package Type B6: SOT23-6 Vout_5V LP3211 Vin EN CE VOUT CRY2 □ □ □ CRY1 LP3211 - GND Chip Enable ON OFF Applications LCD Panel Cellular and Smart mobile phone PDA/DSC Marking Information Please see website. USB Host power LP3211- – 00 Ver. 1.0 Datasheet FEB.-2009 Page 1 of 6 Preliminary Datasheet LP3211 Functional Pin Description P a c k a g e Ty p e Pin Configurations PIN 1 CRY1 2 GND 3 LP3211 SOT23-6 EN 6 CRY2 5 VIN 4 Vout NAME 1 EN Chip Enable (Active High) 2 CRY1 CRYSTAL INPUT1. 3 GND Ground 4 VOUT 5V Output Voltage 5 VIN Power Input Voltage 6 CRY2 CRYSTAL INPUT2. Absolute Maximum Ratings Input Voltage to GND (VIN) ------------------------------------------------------------------------------------ 6V EN to GND Voltage (Ven) --------------------------------------------------------------------- 0.3V to Vin+0.3V Maximum DC Output Current(Iout) ----------------------------------------------------------------------- 350mA Operating Junction Temperature Range (TJ) ---------------------------------------------------- 40℃ to 150℃ Maximum Soldering Temperature (at leads, 1 0sec) ----------------------------------------------------- 260℃ Electrical Characteristics (Over recommended operating conditions unless specified otherwise) VIN =3.6V,EN=High, TA=25℃ ) Symbol Parameter Conditions Min. 2.8 LP3211 Typ. Max. Vout Unit VOUT Input Voltage Output Voltage Range IQ Quiescent Current No Load 2 4 mA ISHDN Shutdown Current EN = GND 1 5 µA FOSC Oscillator Frequency 1.2 1.5 MHz ISC Output short Circuit Current Limit Vout<0.5V 450 500 mA VEN(L) Enable Threshold Low 0.4 V VEN(H) Enable Threshold High IEN Input Low Current VIN LP3211- – 00 Ver. 1.0 Datasheet FEB.-2009 5.0 0.9 350 1.5 VIN = VEN = 5.5V -1 V V V 1 µA Page 2 of 6 Preliminary Datasheet LP3211 Typical Application Circuit Vin Vout_5V 5 Vin VOUT LP3211 4 10uF 2.2uF 2 Chip Enable ON OFF CRY2 CE Rset(NC) GND 3 6 EN CRY1 10uF 1 NC Fig1. Step up to 5V Circuit Flash WLED Driver Up to 250mA Vin 5 Vin VOUT LP3211 4 CE 2 Chip Enable ON OFF 10uF CRY2 EN 2.2uF Rset(NC) GND 3 10R 6 1 CRY1 10uF NC Fig1. Step up to 5V for Flash LED Driver Flash WLED Driver Up to 250mA Vin 5 Vin VOUT LP3211 4 2.2uF CRY2 1uF Rset(NC) 6 2 PWM Chip Enable ON OFF EN CRY1 2.2uF 1 GND 3 100R NC Fig1. Step up to 5V for white LED Driver LP3211- – 00 Ver. 1.0 Datasheet FEB.-2009 Page 3 of 6 Preliminary Datasheet LP3211 Typical Operating Characteristics LP3211- – 00 Ver. 1.0 Datasheet FEB.-2009 Page 4 of 6 Preliminary Datasheet LP3211- – 00 Ver. 1.0 Datasheet FEB.-2009 LP3211 Page 5 of 6 Preliminary Datasheet LP3211 Packaging Information LP3211- – 00 Ver. 1.0 Datasheet FEB.-2009 Page 6 of 6