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LP6342 Dataheets PDF



Part Number LP6342
Manufacturers Lowpowersemi
Logo Lowpowersemi
Description 2A Step-down Converter
Datasheet LP6342 DatasheetLP6342 Datasheet (PDF)

Preliminary Datasheet LP6342 1.5MHz, 2A Step-down Converter General Description The LP6342 is a 1.5MHz constant frequency current mode PWM step-down converter. It is ideal for portable equipment requiring very high current up to 2A from single-cell Lithium-ion batteries while still achieving over 90% efficiency during peak load conditions. The LP6342 also can run at 100% duty cycle for low dropout operation, extending battery life in portable systems while light load operation provides very l.

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Preliminary Datasheet LP6342 1.5MHz, 2A Step-down Converter General Description The LP6342 is a 1.5MHz constant frequency current mode PWM step-down converter. It is ideal for portable equipment requiring very high current up to 2A from single-cell Lithium-ion batteries while still achieving over 90% efficiency during peak load conditions. The LP6342 also can run at 100% duty cycle for low dropout operation, extending battery life in portable systems while light load operation provides very low output ripple for noise sensitive applications. The LP6342 can supply up to 2A output load current from a 2.5V to 5.5V input voltage and the output voltage can be regulated as low as 0.6V. The high switching frequency minimizes the size of external components while keeping switching losses low. The internal slope compensation setting allows the device to operate with smaller inductor values to optimize size and provide efficient operation. The LP6342 is available with adjustable (0.6V to VIN) output voltage. The device is available in a Pb-free, 3mm x 3mm 10-lead TDFN or MSOP-10,SOP8(EP) package and is rated over the-40°C to +85°C temperature range. Order Information LP6342 □ □ □ F: Pb-Free Package Type QV: TDFN-10 MS: MSOP-10 SP:SOP8(EP) Features — Input Voltage Range: 2.5V to 5.5V — Output Voltage Range: 0.6V to VIN — 2A Output Current — Low R(DSON) Internal Switches:130mΩ — High Efficiency :Up to 95% — 100% Duty Cycle in Dropout — Low Shutdown Current: < 1 u A — 1.5MHz Switching Frequency — Soft star Function — Short Circuit Protection — Thermal Fault Protection — 3 m m × 3 m m TDFN-10 or MSOP-10,SOP8(EP) Package — RoHS Compliant and 100% Lead (Pb)-Free Applications — Portable Instruments — DSP Core Supplies — Cellular Phone and Smart mobile phone — PDA — GPS Applications Marking Information Please see website:www.lowpowersemi.com. Typical Application Circuit VIN C1 10uF GND PGOOD GND GND 2 Vin LP6342 SW 7 3 Vin SW 8 1 EN FB 5 L1 2.2uH Vout=(R1/R2+1)*VFB Vout_2A R1 C2 22uF R2 6 4 9 10 LP6342-03 Version 1.3 Datasheet Oct.-2011 www.lowpowersemi.com 1 / 15 Preliminary Datasheet LP6342 Functional Pin Description TOP VIEW EN 1 VIN 2 LP6342 VIN 3 PGOOD 4 11 GND FB 5 10 GND 9 GND 8 SW 7 SW 6 GND EN 1 VIN 2 VIN 3 PGOOD 4 FB 5 TDFN-10 MSOP10 LPS LP6342 10 GND 9 GND 8 SW 7 SW 6 GND EN 1 VIN 2 VIN 3 FB 4 LP6342 9 PGND ESOP8 8 GND 7 GND 6 SW 5 GND Pin Description Pin NO TDFN-10 MSOP10 ESOP8 1 11 2, 3 2, 3 2,3 44 9,10 9,10 5,7,8 5 54 66 7, 8 7, 8 6 9 11 11 PIN EN Vin PGOOD GND/PGND FB GND SW PAD Function Block Diagram DESCRIPTION Enable pin. Active high. In shutdown, all functions are disabled drawing <1μA supply current. Do not leave EN floating. Supply Input. Power supply input pin. Must be closely decoupled to AGND with a 10μF or greater ceramic capacitor. Power good output. Ground. Feedback Input. Connect FB to the center point of the external resistor divider. Normal voltage for this pin is 0.6V. Ground. Switch Mode Connection to Inductor. This pin connects to the drains of the internal main and synchronous power MOSFET switches. Ground pad. LP6342-03 Version 1.3 Datasheet Oct.-2011 www.lowpowersemi.com 2 / 15 Preliminary Datasheet LP6342 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 to GND (VEN) ------------------------------------------------------------------------------------ -0.3V to 6V — Operating Temperature Range (TA) --------------------------------------------------------------- -40℃ to 85℃ — Storage Temperature Range (TJ) ----------------------------------------------------------------- -65℃ to 150℃ — Maximum Soldering Temperature (at leads, 10sec) ------------------------------------------------------ 260℃ — ESD Susceptibility HBN(Human Body Mode) ----------------------------------------------------- 2KV MM(Machine Mode) ------------------------------------------------------------ 200V Electrical Characteristics (VIN =VEN, Typical values are TA=25℃ ) Symbol VIN Parameter Input Voltage Conditions Min. 2.5 ΔVLINEREG/ΔVIN Line Regulation VIN = 2.5V to 5.5V, IOUT = 10mA ΔVLOADREG/ΔIOUT Load Regulation VOUT Output Voltage Range IQ Quiescent Current ISHDN Shutdown Current ILIM P-Channel Current Limit Iout=10mA to 2000mA VFB=0V,VIN=4.2V EN = GND 0.6 RDS(ON)H RDS(ON)L ISWLEAK VFB High-Side Switch On Resistance Low-Side Switch On Resistance SW Leakage Current Feedback Threshold Voltage Accuracy VEN=0V, VSW=0 or 5V, VIN=5V VIN=2.5to5.5V, IOUT = 10 to 2000mA 0.585 IFB FB Leakage Current VOUT = 1 .0V FOSC TS TSD Oscillator Frequency Startup Time Over-Temperature Shutdown Threshold VFB=0.6V From Enable to Output Regulatio.


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