LTC3444 - LTC3444是Micropower Synchronous Buck-Boost DC/DC Converter for WCDMA Applications

LTC3444是LINEAR凌力尔特公司的一款内部开关电源降压-升压产品，LTC3444是LTC3444是Micropower Synchronous Buck-Boost DC/DC Converter for WCDMA Applications，本站介绍了LTC3444的封装应用图解、特点和优点、功能等，并给出了与LTC3444相关的LINEAR元器件型号供参考。

LTC3444 - LTC3444是Micropower Synchronous Buck-Boost DC/DC Converter for WCDMA Applications - 内部开关电源降压-升压 - 电源管理 - 凌力尔特

LTC3444 - Micropower Synchronous Buck-Boost DC/DC Converter for WCDMA Applications

LTC3444 - Micropower Synchronous Buck-Boost DC/DC Converter for WCDMA Applications - Linear Technology（凌力尔特）

功能描述

The LTC3444 is a highly efficient, fixed frequency, buckboost DC/DC converter, which operates from input voltages above, below, and equal to the output voltage. The topology incorporated in the IC provides a continuous transfer function through all operating modes, making the product ideal for a single Lithium-Ion or multi-cell applications where the output voltage can vary over a wide range.

The LTC3444 has been optimized for use in 3G WCDMA applications. A unique design yields high efficiency at very low output voltages while also eliminating external components. The high speed error amplifier provides the fast transient response required to slew the RF power amplifier from standby to transmit and transmit to stand by power levels. Output overvoltage protection protects the RF power amplifier.

Operating frequency is internally set to 1.5MHz to minimize external component size while maximizing efficiency. Other features include <1μA shutdown current, internal soft-start, peak current limit and thermal shutdown.

The LTC3444 is available in a small, thermally enhanced 8-lead (3mm × 3mm) DFN package.

特点

Optimized Features for WCDMA Handsets

Regulated Output with Input Voltages Above, Below, or Equal to the Output

0.5V to 5V Output Range

Up to 400mA Continuous Output Current From a Single Lithium-Ion Cell

Minimal External Components

1.5MHz Fixed Frequency Operation

Internal Loop Compensation for Fast Response <25μs Full Scale Output Slewing; COUT 4.7μF

Output Disconnect in Shutdown

2.75V to 5.5V Input

<1μA Shutdown Current