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A8287SLB Datasheet

  • A8287SLB

  • LNB Supply and Control Voltage Regulator

  • 17頁(yè)

  • ALLEGRO   ALLEGRO

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Preliminary Data Sheet
Subject to Change without Notice
January 21, 2004
A8285/A8287
Intended for analog and digital satellite receivers, the LNB (low noise
block) converter regulator is a monolithic linear and switching voltage
regulator, speci鏗乧ally designed to provide power and interface signals
to an LNB downconverter, via coaxial cable.
The device uses a 2-wire bidirectional serial interface, compatible with
the I
2
C (Inter-C bus) standard, that operates up to 400 kHz.
The A8285 is supplied in a 16-lead plastic power SOIC with copper
batwing tabs (suf鏗亁
LB).
The A8287 is supplied in a 24-lead plastic
power SOIC with copper batwing tabs (part number suf鏗亁
LB).
Data Sheet
27448.003c
LNB Supply and Control Voltage Regulator
SCL
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VCP
BOOST
LX
GND
LNB
TOUT
TCAP
NC
A8285SlB
SOIC
SDA
IRQ
GND
VREG
VIN
Scale 1:1
EXTM
ADD
SCL
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
VCP
BOOST
GND
GND
LX
GND
GND
LNB
TOUT
TCAP
NC
TDI
A8287SlB
SOIC
SDA
IRQ
GND
GND
GND
GND
VREG
VIN
EXTM
ADD
TDO
Scale 1:1
FEATURES
LNB selection and standby function
Provides up to 500 mA load current
Two-wire serial I
2
C interface
Built-in tone oscillator, factory-trimmed to 22 kHz; facilitates
DiSEqC鈩?2.0 encoding
Auxiliary modulation input
22 kHz tone detector facilitates DiSEqC鈩?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
ABSOLUTE MAXIMUM RATINGS
Load Supply Voltage, V
IN
....................................16
V
Output Current, I
OUT
..................Internally
Limited*
Output Voltage
LNB, BOOST .....................鈥?.3
V to 28 V
TOUT .................................
鈥?.3 V to 22 V
Logic Input
EXTM ...................................鈥?.3
V to 5 V
Other ....................................
鈥?.3 V to 7 V
Logic Output ........................................
鈥?.3 V to 7 V
Package Power Dissipation 鈥︹€︹€?.See power dissi-
pation information in the Application Information section
Operating Temperature
Ambient, T
A
.......................鈥?0擄C
to +85擄C
Junction, T
J
.......................鈥?0擄C
to +150擄C
Storage,T
S
.......................鈥?5擄C
to +150擄C
* Output current rating may be limited by duty cycle,
ambient temperature, and heat sinking. Under any
set of conditions,
do not exceed
the speci鏗乪d current
rating or a junction temperature of +150擄C.
Use the following complete part numbers when ordering:
Part Number
A8287SLB
A8285SLB
Package
24-pin, batwing SOIC
16-pin, batwing SOIC
Description
All features
Tone detect not provided

A8287SLB 產(chǎn)品屬性

  • 31

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - 專(zhuān)用型

  • -

  • 轉(zhuǎn)換器，模擬和數(shù)字式衛(wèi)星信號(hào)接收器

  • 9 V ~ 16 V

  • 1

  • 12.7 V ~ 20.4 V

  • -20°C ~ 85°C

  • 表面貼裝

  • 24-SOIC（0.295"，7.50mm 寬）

  • 24-SOIC W

  • 管件

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