描述 Description

The LP3219 is a 1.5MHz constant frequency current mode PWM step-down converter. It is ideal for portable equipment which requires very high current up to 2.0A from single-cell Lithium-ion batteries while still achieving over 96% efficiency during peak load conditions. The LP3219 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 noisy sensitive applications. The LP3219 can supply up to 2.0A output load current from at VIN = 3V and has an input voltage 2.5V to 5.5V and the output voltage can be regulated as low as 0.61V. 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 LP3219 is available with adjustable (0.61V to VIN) output voltage. The device is available in a Pb-free, SOT23-5 package and is rated over the temperature range of -40°C to +85°C.

特性 Features

·? Input Voltage Range: 2.5V to 5.5V
·? Output Voltage Range: 0.61V to VIN
·? 2.0A Output Current
·? Low R(DSON) Internal Switches:80mΩ/70mΩ
·? High Efficiency: Up to 96%
·? 100% Duty Cycle in Dropout
·? Low Shutdown Current: <1uA
·? 1.5MHz Switching Frequency
·? Soft star Function
·? Short Circuit Protection
·? Thermal Fault Protection
·? SOT23-5Package
·? RoHS Compliant and 100% Lead (Pb)-Free

應(yīng)用 Application

·? Portable Instruments
·? DSP Core Supplies
·? Cellular Phone and Smart mobile phone
·? PDA
·? GPS Applications