LP6341

Preliminary Datasheet LP6341 1.5MHz, 1.5A Step-down Converter With Soft-Start General Description The LP6341 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 LP6341 is ideal for powering portable equipment that runs from a single cell Lithium-Ion (Li+) battery. The converter can supply 1500mA of load current from a 2.5V to 5.5V input voltage. The output voltage can be regulated as low as 0.5/0.6V. The LP6341 can also run at 100% duty cycle for low dropout applications. The LP6341 is available in a 10-lead 3mm*3mm DFN-10 package and is rated over the -40°C to 85°C temperature range. Features I nput Voltage Range: 2.5V to 5.5V Output Voltage Range: 0.6V to VIN 1500mA Load Current on Channel Up to 95% Efficiency 100% Duty Cycle in Dropout < 1 u A Quiescent Current 1.5MHz Switching Frequency S oft star Function Short Circuit Protection Current Mode Operation Thermal Fault Protection 3 m m × 3 m m TDFN-10 Package RoHS Compliant and 100% Lead (Pb)-Free Order Information LP6341□ - □ □ □ □ □ F: Pb-Free Package Type QV: TDFN-10 Output Voltage Type 12: 1.2V 18: 1.8V 33: 3.3V A: Adjustable Feedback Voltage X: 0.6V Default: 0.5V Applications Portable Media Players Cellular and Smart mobile phone PDA/DSC GPS Applications Marking Information Please see website. Typical Application Circuit VIN 2 3 LP6341XAQVF Vin Vin AGND GND PGND PGND SW SW FB 7 8 5 Vout=(R1/R2+1)*VFB 2.2uH Vout_1.5A 10uF 22pF 1 R1 22uF EN 6 4 9 10 R2 LP6341 –05 Ver. 1.5 Datasheet Feb.-2009 Preliminary Datasheet Functional Pin Description LP6341 D F N- 10(To p View ) Pi n Desc ript ion Pin NO 1 2, 3 4,9,10 5 6 7, 8 PIN EN Vin GND/PGND FB AGND SW DESCRIPTION Enable Control Input. Drive EN1 above 1.5V to turn on the Channel. Drive EN below 0.3V to turn it off (shutdown current < 0.1µA). Supply Input. Ground. Feedback Input. Connect FB to the center point of the external resistor divider. Normal voltage for this pin is 0.6V. Analog Ground Pin. Switch Mode Connection to Inductor. This pin connects to the drains of the internal main and synchronous power MOSFET switches. Function Block Diagram LP6341 –05 Ver. 1.5 Datasheet Feb.-2009 Preliminary Datasheet Absolute Maximum Ratings LP6341 Input Voltage to GND ------------------------------------------------------------------------------------------- 6V SW to GND (VSW) ---------------------------------------------------------------------------- 0.3V to VIN +0.3V FB to GND (VFB) ------------------------------------------------------------------------------ 0.3V to VIN +0.3V EN EN_BAT to GND (VEN) ------------------------------------------------------------------------0.3V to 6V Operating Junction Temperature Range (TJ) ----------------------------------------------------40℃ to 150℃ Maximum Soldering Temperature (at leads, 1 0sec) ----------------------------------------------------- 260℃ Electrical Characteristics (VIN =VEN,Typical values are TA=25℃ ) Symbol Parameter Conditions Min. 2.5 LP6341 Typ. Max. 5.5 Unit V %/v %/v V µA µA A m m µA %/V V V nA Step-Down Converter Input Voltage VIN △VOUT △VFB VOUT IQ ISHDN ILIM RDS(ON)H RDS(ON)L ILXLEAK ∆VLine-reg/∆VIN Output Voltage Line Regulation Reference Voltage Line Regulation Output Voltage Range Quiescent Current Shutdown Current P-Channel Current Limit High-Side Switch On Resistance Low-Side Switch On Resistance LX Leakage Current Line Regulation Feedback Threshold Voltage Accuracy FB Leakage Current Oscillator Frequency Startup Time Over-Temperature Shutdown Threshold Over-Temperature Shutdown Hysteresis Enable Threshold Low Enable Threshold High Input Low Current ILOAD = 0 VINB = 2.5V to 5.5V VINB = 2.5V to 5.5V 0.6 VFB1=VFB2=0V,VIN1/IN2=4.2V ENB = GND 2.3 0.25 0.25 0.4 0.4 VINB 350 1 3 210 200 1 270 2.5 130 120 VEN1/EN2=0V, VSW1/SW2=0 or 5V, VIN1/IN2=5V VINB = 2.8V to 5.5V VINB = 3.6V，LP6341AQVF VINB = 3.6V，LP6341XAQVF 0.485 0.588 0.2 0.5 0.6 30 1.2 From Enable to Output Regulation 1.5 120 150 20 0.4 0.515 0.612 VFB IFB FOSC TS TSD THYS VEN(L) VEN(H) IEN VOUTB = 1 .0V 1.8 MHz µs ℃ ℃ 0.4 0.3 1.0 1.5 1 V V µA VINB = VENB = 5.5V -1 Note: Output Voltage: Vout = VFB X (1+R2/R1) Volts; LP6341 –05 Ver. 1.5 Datasheet Feb.-2009 Preliminary Datasheet Typical Operating Characteristics LP6341 LP6341 –05 Ver. 1.5 Datasheet Feb.-2009 Preliminary Datasheet LP6341 LP6341 –05 Ver. 1.5 Datasheet Feb.-2009 Preliminary Datasheet LP6341 LP6341 –05 Ver. 1.5 Datasheet Feb.-2009 Preliminary Datasheet Packaging Information LP6341 LP6341 –05 Ver. 1.5 Datasheet Feb.-2009