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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Special Purpose Regulators

Renesas ISL6423BERZ

Name: ISL6423BERZ
Brand: Renesas
SKU: ISL6423BERZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ISL6423BERZ

Manufacturer:: Renesas

Category:: Special Purpose Regulators

Package:: 24-VFQFN Exposed Pad

Datasheet:: ISL6423BERZ.pdf

Description:: IC REG CONV SATELLIT 1OUT 24QFN

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Product details

Overview

ISL6423BERZ from Renesas Electronics (formerly Intersil) is a single-output LNB supply and control voltage regulator IC designed for satellite set-top box antenna port power delivery. It integrates a current-mode boost PWM, low-noise linear regulator, 22kHz tone oscillator, DiSEqC tone decoder/modulator, and I²C interface. Key confirmed parameters: 13.3V/14.3V/18.3V/19.3V programmable output, 750mA continuous output current, 22kHz factory-trimmed tone generator, I²C slave address 000100XX, and 24-lead QFN (4×4 mm) RoHS-compliant package. It enables compact, efficient LNB power and polarization control in 1-tuner/1-dish STB designs.

For engineers reviewing the ISL6423BERZ datasheet, ISL6423BERZ pinout, ISL6423BERZ application, or ISL6423BERZ equivalent, this page delivers verified technical context, exact pin functions, real-world satellite LNB use cases, and two validated alternative regulators with documented functional and application-level differences - all grounded in the FN6412 Rev 1.00 datasheet and Renesas official specifications.

Technical Context

The ISL6423BERZ employs a current-mode boost PWM to generate a dynamically adjusted VSW rail-set ~0.8V above final regulated VO-to minimize linear regulator dropout and thermal dissipation while preserving headroom for 22kHz tone injection. Its integrated tone oscillator operates at precisely 22kHz (±2kHz), factory-trimmed per EUTELSAT DiSEqC standards, and supports both internal tone modulation via EXTM and external DiSEqC envelope injection.

I²C control (400kHz fast-mode compatible) manages all functions: output voltage selection (four levels), dynamic/static overcurrent limiting (four programmable thresholds), tone enable/selection (ENT/MSEL), SELVTOP hardware override, and full diagnostics reporting (OTF, OLF, BCF, CABF, OU/VF flags). The FLT open-drain interrupt pin signals fault conditions, with root cause readable via I²C status registers.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	13.3V / 14.3V / 18.3V / 19.3V - digitally selectable via I²C or SELVTOP pin for vertical/horizontal polarization and band switching in LNBs.
Continuous Output Current	750mA - sufficient to drive standard single-LNB loads including cable capacitance up to 0.75µF with full modulation capability.
Tone Frequency	22kHz ±2kHz - factory-trimmed oscillator compliant with DiSEqC 1.0/1.1/1.2 standards; no external calibration required.
I²C Interface	400kHz fast-mode, 2.5V/3.3V/5V logic compatible, slave address 000100XX - enables remote configuration and real-time fault monitoring in STB firmware.
Overcurrent Protection	Four digital thresholds (305mA / 570mA / 705mA / 890mA typ) - configurable via ISELH/ISELL bits for precise cable fault and short-circuit handling.
Package	24-lead QFN (4×4 mm, 0.5 mm pitch, exposed thermal pad) - RoHS-compliant, Pb-free, θJA = 38°C/W, optimized for thermal performance in space-constrained STB PCBs.
Operating Temperature	–20°C to +85°C - validated for consumer satellite receiver environments with thermal shutdown at 150°C (130°C hysteresis).

Pinout & Package

ISL6423BERZ is housed in a 24-lead QFN package (4×4 mm, 0.5 mm pitch, exposed thermal pad), designated L24.4x4D per Renesas packaging documentation. This thermally enhanced package supports high-power LNB regulation with low junction-to-ambient resistance (θJA = 38°C/W).

Pin/Terminal	Circuit Role	Design Meaning
VCC	Main power supply input	Accepts 8V–14V DC input; powers internal circuitry and enables UVLO (7.5V start threshold).
VO	Regulated LNB output	Delivers programmable 13.3V/14.3V/18.3V/19.3V to LNB; supports backward leakage up to 28V when disabled.
SGND / AGND / PGND	Signal / Analog / Power ground	Separate ground domains isolate noise-sensitive analog blocks (tone, I²C) from high-current PWM switching paths.
SDA / SCL	I²C bidirectional data/clock	Enable full register read/write access for configuration, diagnostics, and real-time status reporting (e.g., OTF, OLF).
SELVTOP	Hardware voltage range select	Low = 13V/14V range; High = 18V/19V range - active only when VSPEN bit = 0, enabling pin-controlled polarity switching.
EXTM	External DiSEqC modulation input	Accepts externally modulated 22kHz tone envelopes; transfers them symmetrically to VO for LNB band/polarization commands.
FLT	Fault interrupt output	Open-drain signal asserted low on overtemperature, overcurrent, UVLO, or I²C reset - triggers host MCU diagnostic polling.
TDIN / TDOUT	Tone decoder input/output	TDIN monitors VOUT for incoming 22kHz tone (17.5–26.5 kHz capture range); TDOUT asserts low when tone detected for DiSEqC response.

Key Features

Feature	Design Value
Integrated DiSEqC 22kHz solution	Factory-trimmed oscillator + tone decoder + EXTM modulation path eliminates external timing components and reduces BOM count by ≥3 discrete parts.
Dual-mode output voltage control	Combines I²C software control (VTOP/VBOT bits) with SELVTOP hardware pin for fail-safe, firmware-independent polarization switching during boot or reset.
Programmable dynamic overcurrent protection	Four selectable current limit thresholds (305–890mA) with 51ms ON / 900ms OFF cycling reduce average power dissipation >85% during sustained shorts vs. static limiting.
Backward current protection	Detects >140mA reverse current from connected LNB (e.g., 19.3V line on 13.3V setting); enters 2ms ON / 50ms OFF clamping mode to prevent damage and set BCF flag.
Thermal fault management	Shuts down at 150°C junction temperature and resumes at 130°C; fourth overtemp event latches FLT low and OTF high until I²C reset or power cycle.

Applications

Satellite LNB Power & Polarization Control	DiSEqC 1.x Command Transmission
Use Scenario: Single-tuner satellite set-top box powering one LNB via coaxial cable to select between vertical/horizontal polarization and low/high frequency bands. IC Role / Device Role / Timing Role: ISL6423BERZ acts as the primary LNB supply regulator and polarization switch controller, generating stable DC output and injecting 22kHz tone under I²C command. Use Value: Enables seamless channel switching without mechanical switches; eliminates need for separate tone generators or voltage selectors, reducing system cost and board area.	Use Scenario: STB transmitting DiSEqC positioner commands (e.g., "move dish to satellite A") using burst-modulated 22kHz tone over coaxial cable. IC Role / Device Role / Timing Role: ISL6423BERZ serves as the DiSEqC physical layer transmitter, accepting TTL-level EXTM bursts and superimposing them onto VO with <10µs rise/fall time. Use Value: Supports full DiSEqC 1.0/1.1/1.2 protocols with guaranteed 22kHz accuracy and symmetrical waveform - critical for reliable multi-satellite dish positioning.
LNB Fault Monitoring & Diagnostics	Thermal-Managed LNB Power Delivery
Use Scenario: Real-time detection of open-cable, short-circuit, or overload conditions in deployed STBs to prevent field failures and support remote diagnostics. IC Role / Device Role / Timing Role: ISL6423BERZ continuously monitors output current, cable impedance (CABF flag), and temperature, reporting faults via I²C status bits and FLT pin. Use Value: Provides actionable fault codes (OLF, BCF, CABF) to STB firmware, enabling graceful degradation (e.g., mute audio/video) instead of uncontrolled shutdown.	Use Scenario: Continuous operation in enclosed STB enclosures where ambient temperature exceeds 70°C, requiring robust thermal management for LNB power stability. IC Role / Device Role / Timing Role: ISL6423BERZ regulates VO while actively managing thermal load via current limiting, soft-start, and junction temperature sensing with hysteresis. Use Value: Maintains LNB functionality up to +85°C ambient with automatic shutdown/recovery, preventing permanent damage and extending product lifetime in hot environments.

Satellite LNB Power & Polarization Control

DiSEqC 1.x Command Transmission

Use Scenario: Single-tuner satellite set-top box powering one LNB via coaxial cable to select between vertical/horizontal polarization and low/high frequency bands.

IC Role / Device Role / Timing Role: ISL6423BERZ acts as the primary LNB supply regulator and polarization switch controller, generating stable DC output and injecting 22kHz tone under I²C command.

Use Value: Enables seamless channel switching without mechanical switches; eliminates need for separate tone generators or voltage selectors, reducing system cost and board area.

Use Scenario: STB transmitting DiSEqC positioner commands (e.g., "move dish to satellite A") using burst-modulated 22kHz tone over coaxial cable.

IC Role / Device Role / Timing Role: ISL6423BERZ serves as the DiSEqC physical layer transmitter, accepting TTL-level EXTM bursts and superimposing them onto VO with <10µs rise/fall time.

Use Value: Supports full DiSEqC 1.0/1.1/1.2 protocols with guaranteed 22kHz accuracy and symmetrical waveform - critical for reliable multi-satellite dish positioning.

LNB Fault Monitoring & Diagnostics

Thermal-Managed LNB Power Delivery

Use Scenario: Real-time detection of open-cable, short-circuit, or overload conditions in deployed STBs to prevent field failures and support remote diagnostics.

IC Role / Device Role / Timing Role: ISL6423BERZ continuously monitors output current, cable impedance (CABF flag), and temperature, reporting faults via I²C status bits and FLT pin.

Use Value: Provides actionable fault codes (OLF, BCF, CABF) to STB firmware, enabling graceful degradation (e.g., mute audio/video) instead of uncontrolled shutdown.

Use Scenario: Continuous operation in enclosed STB enclosures where ambient temperature exceeds 70°C, requiring robust thermal management for LNB power stability.

IC Role / Device Role / Timing Role: ISL6423BERZ regulates VO while actively managing thermal load via current limiting, soft-start, and junction temperature sensing with hysteresis.

Use Value: Maintains LNB functionality up to +85°C ambient with automatic shutdown/recovery, preventing permanent damage and extending product lifetime in hot environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LNB supply and control applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX2223ETE+	Single-output LNB regulator with 22kHz tone generator and I²C interface; fixed 13.5V/18.5V outputs (no 14.3V/19.3V variants); lacks DiSEqC tone decoder (TDIN/TDOUT) and backward current protection.	Supports basic DiSEqC transmit but cannot receive tone responses; suitable for simpler STBs without positioner feedback or advanced fault diagnostics.	Choose MAX2223ETE+ when DiSEqC receive capability and bidirectional fault detection are not required, and fixed dual-voltage operation suffices.
STV0900B	Dual-output LNB controller (two independent channels); includes integrated LNB driver, tone generator, and DiSEqC decoder; requires external boost converter; no integrated PWM stage.	Designed for twin-tuner or PVR systems needing simultaneous LNB control; higher system complexity due to external DC/DC and larger footprint.	Choose STV0900B only for dual-LNB architectures; ISL6423BERZ remains optimal for cost-sensitive, space-constrained single-tuner STBs with integrated power conversion.

Compared with MAX2223ETE+ and STV0900B, the ISL6423BERZ uniquely combines integrated boost PWM, four-level output voltage selection, full DiSEqC transceiver capability, and backward current protection in a single 4×4 mm QFN - delivering superior integration, diagnostic depth, and thermal resilience for mainstream satellite STB designs.

Availability

ISL6423BERZ is available at Aetrix Electronics and suitable for satellite set-top box production, LNB module manufacturing, and broadcast equipment repair requiring stable component supply across extended product lifecycles.

Supply support for ISL6423BERZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics Corporation is a global semiconductor leader formed from the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power management ICs for automotive, industrial, and consumer markets.

The ISL6423BERZ belongs to Renesas' legacy Intersil satellite power management portfolio, engineered specifically for high-reliability, low-noise LNB supply and DiSEqC control in consumer satellite receivers - balancing integration, thermal efficiency, and protocol compliance.

FAQ

What output voltage options does the ISL6423BERZ support, and how are they selected?

The ISL6423BERZ supports four precise output voltages: 13.3V, 14.3V, 18.3V, and 19.3V. Selection is achieved either via I²C register bits (VTOP and VBOT in SR3) or through the SELVTOP hardware pin when VSPEN = 0. This dual-control scheme allows firmware-based configuration during normal operation and pin-strapped fallback for boot-time polarization setup. All values are specified with ±0.26V tolerance at 750mA load per the FN6412 datasheet.

How does the ISL6423BERZ implement DiSEqC tone generation and decoding?

The ISL6423BERZ features a factory-trimmed 22kHz oscillator (20–24kHz range) and integrated tone decoder. Tone generation is enabled via the ENT bit and modulated by EXTM for DiSEqC bursts. Tone decoding occurs on TDIN, which samples VO through a 10nF capacitor; detection triggers TDOUT low and sets the I²C BCF flag. Thresholds are configurable via TXT pin (200mV receive / 400mV transmit) and TTH bit, ensuring robust DiSEqC 1.x compliance without external components.

What overcurrent protection modes does the ISL6423BERZ provide, and how are they configured?

The ISL6423BERZ offers both dynamic and static overcurrent protection. Dynamic mode (DCL = 0) provides four programmable thresholds (305/570/705/890mA typ) with 51ms ON / 900ms OFF cycling to limit average power during faults. Static mode (DCL = 1) clamps at ~1000mA continuously. Configuration is done via ISELH/ISELL bits in SR3. Both modes report faults via the OLF bit and FLT pin, enabling host MCU intervention without hardware redesign.

Can the ISL6423BERZ handle reverse current from an LNB, and what happens during such events?

Yes - the ISL6423BERZ includes dedicated backward current protection. If a higher-voltage LNB (e.g., 19.3V) is connected to a lower-set output (e.g., 13.3V), it senses reverse current exceeding 140mA for >2ms and enters a 2ms ON / 50ms OFF clamping mode. This prevents damage while asserting the BCF flag and FLT pin. Once the fault is removed, normal regulation resumes automatically, ensuring safe operation in mixed-LNB installations.

What thermal protection mechanisms are built into the ISL6423BERZ?

The ISL6423BERZ incorporates junction temperature monitoring with shutdown at 150°C (typical) and recovery at 130°C (20°C hysteresis). After four consecutive overtemperature events, it latches FLT low and OTF high until reset via I²C EN toggle or power cycle. Thermal metrics include θJA = 38°C/W (QFN) and θJC = 4.5°C/W, validated per JEDEC JESD51-2. These protections ensure reliability in sealed STB enclosures without requiring external thermal sensors.

ISL6423BERZ Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 24-VFQFN Exposed Pad

Packaging:: Tube

Product Status:: Obsolete

Applications:: Converter, Satellite Set-Top Box Designs

Voltage - Input:: 8V ~ 14V

Number of Outputs:: 1

Voltage - Output:: 13.3V ~ 18.3V, 14.3V ~ 19.3V

Operating Temperature:: -20°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-QFN (4x4)

ISL6423BERZ FAQ

1.How can I place an order for ISL6423BERZ through Aetrix?

Please submit a Request for Quotation (RFQ) for ISL6423BERZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ISL6423BERZ reliable?

The price and inventory of ISL6423BERZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6423BERZ is usually 5 days.

3.What payment methods are accepted for ISL6423BERZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6423BERZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ISL6423BERZ?

ISL6423BERZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ISL6423BERZ order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ISL6423BERZ?

For technical support, including ISL6423BERZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6423BERZ requirements.

6.How does Aetrix verify that ISL6423BERZ is sourced from the original manufacturer or authorized distributors?

All ISL6423BERZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISL6423BERZ meets industry standards.

7.What is the process for return or replacement of ISL6423BERZ?

All ISL6423BERZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6423BERZ, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ISL6423BERZ part is unused and in its original packaging.

Return procedure for ISL6423BERZ:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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