ISL6421 Single Output LNB Supply and Control Voltage Regulator with I<sup>2</sup>C Interface for Advanced Satellite Set-top Box Designs

ISL6421

Single Output LNB Supply and Control Voltage Regulator with I²C Interface for Advanced Satellite Set-top Box Designs

Datasheets,
Related Docs
& Simulations

Ordering Information

iBuy direct from Intersil	iBuy direct - out of stock	Request samples
Check distributor inventory	Available in RoHS/Pb-Free

Part No.

Design-In
Status

Temp.

Package

MSL

Price
US $

ISL6421ERZ

Active

Extended Comm

32 Ld QFN

2.67

ISL6421ERZ-T

Active

Extended Comm

32 Ld QFN T+R

2.67

ISL6421EVAL1

Active

Eval Board

N/A

ISLUSBI2CKIT1Z

Active

Eval Board

N/A

ISL6405I2C-KIT-EVAL

InActive

Eval Board

N/A

ISL6421ER

InActive

Extended Comm

32 Ld QFN

N/A

ISL6421ER-T

InActive

Extended Comm

32 Ld QFN T+R

N/A

The price listed is the manufacturer's suggested retail price for quantities of 1K units. However, prices in today's market are fluid and may change without notice.

MSL = Moisture Sensitivity Level - per IPC/JEDEC J-STD-020

SMD = Standard Microcircuit Drawing

Description

The ISL6421 is a highly integrated solution for supplying power and control signals from advanced satellite set-top box (STB) modules to the low noise block (LNB). This device is comprised of a current-mode boost PWM and a low-noise linear regulator, along with the circuitry required for I²C device interfacing and for providing DiSEqCTM standard control signals to the LNB.

A regulated output voltage is available at the output terminal (VOUT) to support the operation of the antenna port in advanced satellite STB applications. The regulated output may be set to either 13V or 18V by use of the voltage select command (VSEL) through the I²C bus. Additionally, to compensate for the voltage drop in the coaxial cable, the voltage may be increased by 1V with the line length compensation (LLC) feature. An enable command sent on the I²C bus provides standby mode control for the PWM and linear combination, disabling the output to conserve power.

A current-mode boost converter provides the linear regulator with an input voltage that is set to the required output voltage, plus 1.2V (typ.) to insure minimum power dissipation. This maintains a constant voltage drop across the linear pass element, while permitting an adequate voltage range for tone injection.

The device is capable of providing 450mA (typ.).

Key Features

Switch-Mode Power Converter for Lowest Dissipation
- Boost PWM with >92% Efficiency
- Selectable 13V or 18V Outputs
- Digital Cable Length Compensation (1V)
External Pin to Select 13V/18V Options
I²C Compatible Interface for Remote Device Control
- Registered Slave Address 0001 00XX
- Fully Functional 3.3V, 5V Operation up to 400kHz
Built-In Tone Oscillator Factory Trimmed to 22kHz
- Facilitates DiSEqC (EUTELSAT) Encoding
Internal Over-Temperature Protection and Diagnostics
Internal Overload and Overtemp Flags (Visible on I²C)
LNB Short-Circuit Protection and Diagnostics
QFN Package
- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Product Outline
- Near Chip-Scale Package Footprint
Pb-free available

Related Documentation

Application Note(s):
ISL6421, ISL6425 Single LNB Controllers with I2C Interface for Advanced Satellite Set-Top Box Designs

Datasheet(s):
Single Output LNB Supply and Control Voltage Regulator with I²C Interface for Advanced Satellite Set-top Box Designs

Evaluation Board(s):
Downloadable Driver for the ISL6405I2C-KIT-EVAL Downloadable Driver for the ISLUSBI2CKIT1Z (v101)

Technical Homepage:
Broadband

Parametric Data


V_IN (min) (V)		8

V_IN (max) (V)		14

V_OUT (min) (V)		13

V_OUT (max) (V)		18

I_OUT (max) (mA)		750

I_BIAS (min) (mA)		1.5

Applications

LNB Power Supply and Control for Satellite Set-Top Box References

Related Devices

Parametric Table

	ISL6405		Dual Output LNB Supply and Control Voltage Regulator with I²C Interface for Advanced Satellite Set-top Box Designs
	ISL6421A		Single Output LNB Supply and Control Voltage Regulator with I²C Interface for Advanced Satellite Set-top Box Designs
	ISL6423		Single Output LNB Supply and Control Voltage Regulator with I²C Interface for Advanced Satellite Set-Top Box Designs, DiSEqC 2.0 Compatible
	ISL6423B		Single Output LNB Supply and Control Voltage Regulator with I²C Interface for Advanced Satellite Set-Top Box Designs
	ISL6424		Dual Output LNB Supply and Control Voltage Regulator with I²C Interface for Advanced Satellite Set-Top Box Designs
	ISL6425		Single Output LNB Supply and Control Voltage Regulator with I²C Interface for Advanced Satellite Set-top Box Designs
	ISL9491		Single Output LNB Supply Voltage Regulator for Satellite Set-Top Box Applications
	ISL9491A		Single Output LNB Supply Voltage Regulator for Satellite Set-Top Box Applications