A8287

更新时间： 2024-11-08 22:26:51

品牌	Logo	应用领域
急速微 - ALLEGRO		稳压器
页数	文件大小	规格书
17页	526K
描述
LNB Supply and Control Voltage Regulator

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A8287 数据手册

Preliminary Data Sheet

Subject to Change without Notice

January 21, 2004

A8285/A8287

LNB Supply and Control Voltage Regulator

Intended for analog and digital satellite receivers, the LNB (low noise

SCL

SDA

IRQ

16 VCP

A8285SlB

SOIC

block) converter regulator is a monolithic linear and switching voltage

regulator, speciﬁcally designed to provide power and interface signals

to an LNB downconverter, via coaxial cable.

BOOST

14 LX

13 GND

GND

VREG

VIN

LNB

The device uses a 2-wire bidirectional serial interface, compatible with

the I²C (Inter-C bus) standard, that operates up to 400 kHz.

TOUT

Scale 1:1

EXTM

ADD

10 TCAP

The A8285 is supplied in a 16-lead plastic power SOIC with copper

batwing tabs (sufﬁx LB). The A8287 is supplied in a 24-lead plastic

power SOIC with copper batwing tabs (part number sufﬁx LB).

SCL

SDA

IRQ

24 VCP

BOOST

A8287SlB

SOIC

22 GND

GND

VREG

VIN

GND

18 GND

LNB

16 TOUT

15 TCAP

EXTM

Scale 1:1

ADD 11

FEATURES

TDO

13 TDI

ꢀ

LNB selection and standby function

Provides up to 500 mA load current

Two-wire serial I²C interface

ABSOLUTE MAXIMUM RATINGS

Built-in tone oscillator, factory-trimmed to 22 kHz; facilitates

DiSEqC™ 2.0 encoding

Auxiliary modulation input

22 kHz tone detector facilitates DiSEqC™ decoding (A8287 only)

Tracking switch-mode power converter for lowest dissipation

LNB overcurrent protection and diagnostics

Internal overtemperature protection

LNB voltages (16 possible levels) compatible with all common

standards

Load Supply Voltage, V_IN....................................16 V

Output Current, I_OUT..................Internally Limited*

Output Voltage

LNB, BOOST .....................–0.3 V to 28 V

TOUT................................. –0.3 V to 22 V

Logic Input

EXTM ...................................–0.3 V to 5 V

Other .................................... –0.3 V to 7 V

Logic Output........................................ –0.3 V to 7 V

Package Power Dissipation ………..See power dissi-

pation information in theApplication Information section

Operating Temperature

ꢀ

Ambient, T .......................–20°C to +85°C

Junction, T_J.......................–20°C to +150°C

Storage,T_S.......................–55°C to +150°C

Use the following complete part numbers when ordering:

* Output current rating may be limited by duty cycle,

ambient temperature, and heat sinking. Under any

set of conditions, do not exceed the speciﬁed current

rating or a junction temperature of +150°C.

Part Number

A8287SLB

A8285SLB

Package

Description

24-pin, batwing SOIC All features

16-pin, batwing SOIC Tone detect not provided

12 3 4 5 6 7...17

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与A8287相关器件

型号	品牌	获取价格	描述	数据表
A8287SLB	ALLEGRO	获取价格	LNB Supply and Control Voltage Regulator
A8287SLBTR-T	ALLEGRO	获取价格	Analog Circuit, 1 Func, PDSO24, BATWING, LEAD FREE, PLASTIC, SOIC-24
A8290	ALLEGRO	获取价格	Single LNB Supply and Control Voltage Regulator
A8290SETTR-TB	ALLEGRO	获取价格	Single LNB Supply and Control Voltage Regulator
A8291	ALLEGRO	获取价格	Single LNB Supply and Control Voltage Regulator
A8291SETTR-TB	ALLEGRO	获取价格	Single LNB Supply and Control Voltage Regulator
A8292	ALLEGRO	获取价格	Dual LNB Supply and Control Voltage Regulator
A8292SETTR-T	ALLEGRO	获取价格	Dual LNB Supply and Control Voltage Regulator
A8293	ALLEGRO	获取价格	Single LNB Supply and Control Voltage Regulator
A8293SESTR-T	ALLEGRO	获取价格	Single LNB Supply and Control Voltage Regulator

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