Preliminary Datasheet LP6341 1.5MHz, 1.5A Step-down Converter With Soft-Start General Description Features 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. Applications Order Information LP6341□ - □ □ □ □ Input 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 Soft 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 □ F: Pb-Free Package Type QV: TDFN-10 Portable Media Players Cellular and Smart mobile phone PDA/DSC GPS Applications Marking Information Output Voltage Type 12: 1.2V 18: 1.8V 33: 3.3V A: Adjustable Please see website. Feedback Voltage X: 0.6V Default: 0.5V Typical Application Circuit 10uF 2 3 1 LP6341XAQVF Vin Vin SW SW AGND GND PGND PGND VIN EN FB 7 8 2.2uH 22pF 5 Vout_1.5A R1 6 4 9 10 Vout=(R1/R2+1)*VFB LP6341 –05 Ver. 1.5 Datasheet Feb.-2009 R2 22uF Preliminary Datasheet Functional Pin Description DF N- 10(To p View ) Pi n Desc ript ion Pin NO PIN DESCRIPTION 1 EN 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). 2, 3 Vin Supply Input. 4,9,10 GND/PGND 5 FB 6 AGND 7, 8 SW 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 LP6341 Preliminary Datasheet LP6341 Absolute Maximum Ratings 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℃ ) Parameter Symbol Conditions Step-Down Converter Input Voltage VIN VINB = 2.5V to 5.5V Output Voltage Line Regulation △VFB VOUT Reference Voltage Line Regulation Output Voltage Range IQ Quiescent Current VFB1=VFB2=0V,VIN1/IN2=4.2V ISHDN ILIM Shutdown Current ENB = GND RDS(ON)H RDS(ON)L VFB 0.4 %/v 0.25 0.4 %/v 270 VINB 350 V µA 3 A High-Side Switch On Resistance 130 210 m Low-Side Switch On Resistance 120 200 m 2.3 LX Leakage Current VEN1/EN2=0V, VSW1/SW2=0 or 5V, VIN1/IN2=5V Line Regulation Feedback Threshold Voltage Accuracy VINB = 2.8V to 5.5V Oscillator Frequency TS VEN(L) Startup Time Over-Temperature Shutdown Threshold Over-Temperature Shutdown Hysteresis Enable Threshold Low VEN(H) Enable Threshold High IEN Input Low Current Ver. 1.5 Datasheet Feb.-2009 1 µA 0.2 0.4 %/V VINB = 3.6V，LP6341AQVF 0.485 0.5 0.515 V VINB = 3.6V，LP6341XAQVF 0.588 0.6 0.612 V 30 VOUTB = 1 .0V 1.2 From Enable to Output Regulation 0.3 VINB = VENB = 5.5V Output Voltage: Vout = VFB X (1+R2/R1) Volts; LP6341 –05 0.25 2.5 FOSC Note: V µA FB Leakage Current THYS Unit 1 IFB TSD Max. 5.5 0.6 P-Channel Current Limit ∆VLine-reg/∆VIN LP6341 Typ. 2.5 ILOAD = 0 VINB = 2.5V to 5.5V △VOUT ILXLEAK Min. -1 1.5 nA 1.8 MHz 120 µs 150 ℃ 20 ℃ 1.0 0.4 V 1.5 V 1 µA Preliminary Datasheet Typical Operating Characteristics LP6341 –05 Ver. 1.5 Datasheet Feb.-2009 LP6341 Preliminary Datasheet LP6341 –05 Ver. 1.5 Datasheet Feb.-2009 LP6341 Preliminary Datasheet LP6341 –05 Ver. 1.5 Datasheet Feb.-2009 LP6341 Preliminary Datasheet Packaging Information LP6341 –05 Ver. 1.5 Datasheet Feb.-2009 LP6341