描述 Description

The LP78073A is a PMIC，which has 1ch Charger and 1ch Synchronous Boost Converter with ESOP-8 package. Its charger is a complete constant-current constant voltage linear charger for single cell lithium-ion batteries. Furthermore, the LP78073A is specifically designed to work within USB power specifications. No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature. The charge voltage is fixed at 4.2V, and the charge current can be ISET rammed externally with a single resistor. The charger automatically terminates the charge cycle when the charge current drops to 1/10th the ISET rammed value after the final float voltage is reached. When the input supply (wall adapter or USB supply) is removed, the LP78073A automatically enters a low current state, dropping the battery drain current to less than 8μA. Other features include charge current monitor, under voltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage. Boost converter is Synchronous current mode boost DC-DC converter. Its PWM circuitry with built-in 2.7A Current power MOSFET makes this converter highly power efficiently. Selectable high switching frequency allows faster loop response and easy filtering with a low noise output. The non-inverting input and its error amplifier is connected to an internal 800mV precision reference voltage.

特性 Features

·? Charger:
·? Programmable Charge Current Up to 1000mA
·? No MOSFET, Sense Resistor or Blocking Diode Required
·? Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate Without Risk of Overheating
·? Charges Single Cell Li-Ion Batteries Directly from USB Port
·? 8μA Supply Current in Shutdown
·? Drainage Charge Current Thermal Regulation Status Outputs for LED or System Interface
·? Boost:
·? 5V/1.2A Output Current @ Vin=3.3V
·? 1MHz fixed frequency switching
·? High Switch On Current: 2.7A
·? Low RDS(ON) Integrated Power Mosfet
·? Efficiency is 95%
·? Built-in OTP, OCP, Soft-Star
·? Consumption Available in ESOP-8 Package
·? RoHS Compliant and 100% Lead (Pb)-Free

應(yīng)用 Application

·? MID/Pad
·? Power Bank
·? Smart Phone
·? Bluetooth Applications