A8304中文资料A8304: Single LNB Supply and Control Voltage Regulator数据手册Allegro规格书

描述 Description

The A8304 is a single channel low noise block regulator(LNBR). The A8304 consists of a monolithic boost converterfollowed by a low-drop linear regulator. It is specificallydesigned to provide the power and the interface signals to anLNB down converter via coaxial cable in satellite TV receiversystems.
The A8304 requires few external components, with the boostswitch and compensation circuitry integrated inside of thedevice. The 704 kHz switching frequency and user-controlledoutput current limit minimize the size of the passive filteringcomponents.
The I2C™-compatible interface provides control capabilities forcomplex system requirements, as well as diagnostic capabilitiesfor system fault reporting.
A sleep pin is available to maximize power savings and toquickly shut down the device if needed, without using I2C™control.
The A8304 is provided in a small 3 × 3 mm QFN package withexposed pad for thermal dissipation. It is lead (Pb) free, with100% matte tin leadframe plating.

特性 Features

•Integrated boost MOSFET, current sensing, and compensation
•704 kHz switching frequency for small low-cost components
•SLEEP pin for ultra-low power consumption mode
•Adjustable LNB output current limit (250 to 950 mA*) limit with shutdown timer•Covers wide array of application requirements
•Minimizes component sizing to fit each application
•For startup, reconfiguration, and continuous output

•Boost peak current limit scales with LNB current limit
•Optional temporary increased current limit (+25%)
•Compatible with DiSEqC1.x control2-wire I2C™-compatible interface for control and status•Programmable LNB output voltage levels (2% accuracy)
•Enable/disable output
•Flexible 22 kHz tone generation methods
•SINK_DIS bit for controlling the push-pull output sink current threshold

•Diagnostic features: PNG
•Extensive protection features: UVLO, OCP, TSD
*maximum value depends on PCB thermal design

简介

A8304属于集成电路（IC）的特殊用途稳压器。由制造生产的A8304特殊用途稳压器该系列产品用于电源控制、某种形式的转换，适用于特定的复杂应用。因此，各种产品特性集差异较大，包括空燃比传感器接口、汽车交流发电机电压调节、DDR 端接、液体透镜控制、摩托车转向信号控制、热电 (peltier) 冷却器控制、压电触觉控制、阀门控制、小型发动机管理等。