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LP6343 Datasheet(PDF) 1 Page - Lowpower Semiconductor inc |
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LP6343 Datasheet(HTML) 1 Page - Lowpower Semiconductor inc |
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1 / 12 page  Preliminary Datasheet LP6343 LP6343 –00 Version 1.0 Datasheet Feb.-2010 www.lowpowersemi.com Page 1 of 12 1.5MHz, 3A Step-down Converter With Soft-Start General Description The LP6343 contains a independent 1.5MHz constant frequency, current mode, PWM step-down converters. The converter integrates a main switch and a synchronous rectifier for high efficiency without an external Schottky diode. The LP6343 is ideal for powering portable equipment that runs from a single cell Lithium-Ion (Li+) battery. The converter can supply 3000mA of load current from a 2.5V to 5.5V input voltage. The output voltage can be regulated as low as 0.6V. The LP6343 can also run at 100% duty cycle for low dropout applications. The LP6343 is available in a 10-lead 3mm*3mm TDFN-10 and EMSOP-10 package and is rated over the -40°C to 85°C temperature range. Order Information LP6343□ □ □ □ F: Pb-Free Package Type QV: TDFN-10 MS: MSOP-10(E) Output type A: Adjustable Typical Application Circuit Features Input Voltage Range: 2.5V to 5.5V Output Voltage Range: 0.6V to VIN 3000mA Load Current on Channel Up to 95% Efficiency 100% Duty Cycle in Dropout < 1 u A Quiescent Current 1.5MHz Switching Frequency Soft star Function Short Circuit Protection Current Mode Operation Thermal Fault Protection 3 m m × 3 m m TDFN-10 or MSOP-10 Package RoHS Compliant and 100% Lead (Pb)-Free Applications Portable Media Players Cellular and Smart mobile phone PDA/DSC GPS Applications Marking Information Please see website. www.lowpowersemi.com R1 45K LP6343AQVF 1 7 5 2 3 8 4 EN SW FB Vin Vin SW PGOOD Vout=(R1/R2+1)*0.6V 22uF*2 2.2uH 22uF 3.3V/3A 22pF VIN_5V R2 10K |
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