A8296SESTR-T Allegro Microsystems Inc, A8296SESTR-T Datasheet

A8296SESTR-T

Manufacturer Part Number

A8296SESTR-T

Description

IC REG LNB SGL SUPPLY 16-QFN

Manufacturer

Allegro Microsystems Inc

Datasheet

1.A8296SESTR-T.pdf (18 pages)

Specifications of A8296SESTR-T

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

Available stocks

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Part Number

Manufacturer

Quantity

Price

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Part Number:

A8296SESTR-T

Manufacturer:

NEC

Quantity:

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Part Number:

A8296SESTR-T

Manufacturer:

ALLEGRO/雅丽高

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Part Number:

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Quantity:

13 500

Current page: 1 of 18
Download datasheet (365Kb)

Package: 16-contact MLP/QFN (suffix ES)

8296-DS

Features and Benefits

▪ Integrated boost MOSFET, current sensing, and

▪ Supplies up to 500 mA continuously

▪ Adjustable LNB output current limit from 300 to 500 mA

▪ Boost peak current limit scales with LNB current

▪ 8 programmable LNB output voltage (DAC) levels

▪ LNB overcurrent limiter with shutdown timer

▪ Tracking boost converter minimizes power dissipation

▪ LNB transition times configurable by external capacitor

▪ Push-pull LNB output stage maintains 13→18 V and

▪ Built-in 22 kHz tone oscillator facilitates DiSEqC™ tone

▪ Tone generation does not require additional external

▪ Diagnostic features: PNG

▪ Extensive protection features: UVLO, OCP, TSD, CPOK

▪ 2-wire I

compensation

limit setting

8→13 V transition times, even with highly capacitive loads

encoding, even at no-load

components

3 mm × 3 mm × 0.75 mm

For recommended external components, refer to table 5

C-compatible interface

R1 R2 R3

Single LNB Supply and Control Voltage Regulator

SET

TONECNTL

VREG

220 nF

SDA

ADD

SCL

ISET

IRQ

Compatible

Regulator

Interface

100

C™-

DAC

Functional Block Diagram

100 μF

Fault Monitor

VIN

PAD

f sw

OCP

PNG

TSD

UVLO

Converter

Boost

LNB

Voltage

Control

33 μH

Oscillator

GND

TCAP

f sw

TONECNTL

100 μF

GNDLX

Divider

Clock

Description

Intended for analog and digital satellite receivers, this single

low noise block converter regulator (LNBR) is a monolithic

linear and switching voltage regulator, specifically designed to

provide the power and the interface signals to an LNB down

converter via coaxial cable. The A8296 requires few external

components, with the boost switch and compensation circuitry

integrated inside of the device.

The A8296 has been designed for high efficiency, utilizing

the Allegro

switch has been optimized to minimize both switching and

static losses. To further enhance efficiency, the voltage drop

across the tracking regulator has been minimized.

For DiSEqC™ communications, a tone control pin is provided

to gate the internally-generated 22 kHz tone on-and-off.

A comprehensive set of fault registers are provided, which

comply with all the common standards, including: overcurrent,

thermal shutdown, undervoltage, and power not good.

Furthermore, design methodology and structure ensure the

highest level of robustness against transients and component

failures.

The device uses a 2-wire bidirectional serial interface,

compatible with the I

400 kHz.

The A8296 is supplied in a lead (Pb) free package.

Shape

Wave

22 kHz

1 μF

BOOST

Linear

Stage

VCP

Charge

Pump

100 nF

advanced BCD process. The integrated boost

LNB

TCAP

100 nF

D3 and D4 are used for surge protection.

C™ standard, that operates up to

C10

220 nF

10 nF

OUT

A8296

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