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LP78084 Datasheet(PDF) 1 Page - Lowpower Semiconductor inc |
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LP78084 Datasheet(HTML) 1 Page - Lowpower Semiconductor inc |
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1 / 20 page  Preliminary Datasheet LP78084 LP78084 – 02 Ver. 1.1 Datasheet Nov.-2007 Page 1 of 22 Total Power solution of Portable Applications 800mA Charge +800mA Buck DC/DC+300mA LDO General Description The LP78084 is a complete constant-current/ constant-voltage linear battery charger for a single-cell 4.2V lithium-ion battery with a 800mA step-down converter, and a 300mA low dropout (LDO) linear regulator. The input voltage range is 3.75V to 5.5V for the battery charger and 2.6V to 5.5V for the step-down converter and linear regulator, making it ideal for applications operating with single-cell lithium-ion/polymer batteries. The battery charger offers an integrated pass device, reverse blocking protection, high accuracy current and voltage regulation, charge status, and charge termination. The charging current is programmable via external resistor from 15mA to 800mA. In addition to these standard features, the device offers current limit, thermal protection, and soft-start. The step-down converter is a highly integrated converter operating at a 1.5MHz switching frequency, minimizing the size of external components while keeping switching losses low. It has independent input and enable pins. The output voltage ranges from 0.6V to the input voltage. The LP78084 linear regulator is designed for fast transient response and good power supply ripple rejection. Designed for 300mA of load current, it includes short-circuit protection and thermal shutdown. The LP78084 is available in a 16-lead 3mm*4mm TDFN package and is rated over the -40°C to 85°C temperature range. Order Information LP78084 - □ □ □ □ □ F: Pb-Free Package Type QV: TDFN-16 LDO Output Voltage 33: 3.3V 30: 3.0V 28: 2.8V 18: 1.8V Applications Portable Media Players/MP3 players Cellular and Smart mobile phone PDA/DSC Bluetooth Applications Features Battery Charger: − Input Voltage Range : 3.75 V to 5.5V − Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charge Rate Without Risk of Overheating − Internal 4.5 Hour Safety Timer for Termination − Charge Current Programmable Up to 800mA with 5% Accuracy − C/10 Charge Current Detection Output − 5 uA Supply Current in Shutdown Mode Synchronous Buck Converter: − Input Voltage Range: 2.6V to 5.5V − Output Voltage Range: 0.6V to VIN − 800mA Output Current − Up to 90% Efficiency − 36u A Quiescent Current − 1.5MHz Switching Frequency − 120 uS Start-Up Time Linear Regulator: − 300mA Output Current − Low Dropout: 150mV at 300mA − Fast Line and Load Transient Response − High Accuracy: ± 1.5% − 84uA Quiescent Current Short-Circuit, Over-Temperature, and Current Limit Protection 3 m m × 4 m m TDFN-16 Package RoHS Compliant and 100% Lead (Pb)-Free Typical Application Circuit ENA R1 AC/USB VA BATT ENB 11 9 13 6 3 4 8 15 1 5 7 16 AC/USB STAT ENA EN_BAT ENB VinA BATT LX FB OUTA Iset VINB LP78084 VOUTA VOUTB R2 Marking Information Please see website. |
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