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Renesas ISL6423BEVEZ
- Part No.:
- ISL6423BEVEZ
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
ISL6423BEVEZ.pdf
- Description:
- IC REG CONV SATELL 1OUT 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,065
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Product details
Overview
ISL6423BEVEZ from Renesas (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 decoder, and I²C interface - delivering 13.3V/14.3V or 18.3V/19.3V regulated output with up to 750mA continuous current, ±0.3V output accuracy, and 22kHz factory-trimmed tone generation for EUTELSAT-compliant DiSEqC encoding.
For engineers reviewing the ISL6423BEVEZ datasheet, ISL6423BEVEZ pinout, ISL6423BEVEZ application, or ISL6423BEVEZ equivalent, this device serves as a complete LNB power and control solution for 1-tuner/1-dish STB designs requiring programmable polarization switching, cable fault detection, backward leakage protection up to 28V, and I²C-configurable dynamic current limiting across four thresholds.
Technical Context
The ISL6423BEVEZ employs a two-stage architecture: a high-efficiency (>92%) boost PWM generates a VSW rail set ~0.8V above final VO to minimize linear regulator dropout, followed by a low-noise linear post-regulator enabling precise 13.3–19.3V output control. Tone generation and DiSEqC modulation are handled internally via a 440kHz oscillator (20×22kHz) and dedicated EXTM/TXT/ TDIN/TDOUT signal paths.
I²C control (slave address 0001 00XX) manages all functions including VTOP/VBOT voltage selection, DCL mode, SELVTOP hardware override, ENT tone enable, MSEL modulation source, and real-time diagnostics (OTF, OLF, BCF, CABF, OU/VF bits). Thermal shutdown triggers at +150°C with +20°C hysteresis, and FLT provides open-drain fault interrupt signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 13.3V, 14.3V, 18.3V, or 19.3V - selectable via I²C VTOP/VBOT bits or SELVTOP pin; supports vertical/horizontal LNB polarization switching. |
| Max Continuous Output Current | 750mA - sufficient for driving single-LNB loads with margin; derated above +60°C per EPTSSOP thermal curve. |
| Tone Frequency Accuracy | 22kHz ±10% (20–24kHz) - factory-trimmed oscillator compliant with DiSEqC EUTELSAT standard; no external calibration required. |
| Dynamic Current Limit Thresholds | 305mA / 570mA / 705mA / 890mA - digitally programmable via ISELH/ISELL bits in SR3 register for short-circuit and overload protection. |
| Backward Leakage Protection | 28V max reverse voltage tolerance - enables safe operation when higher-voltage LNB lines are accidentally connected to lower-set outputs. |
| I²C Interface Speed | Up to 400kHz fast-mode - compatible with 2.5V/3.3V/5V logic; supports diagnostic readback of OTF, OLF, BCF, CABF, and OU/VF status flags. |
| Operating Temperature Range | −20°C to +85°C - specified for industrial-grade satellite STB environments; thermal shutdown at +150°C junction. |
Pinout & Package
ISL6423BEVEZ is housed in a Pb-free, RoHS-compliant 28-lead EPTSSOP package (Moisture Sensitivity Level 3, JEDEC standard), with exposed thermal pad for enhanced heat dissipation. Pin assignment matches the official FN6412 Rev 1.00 datasheet top-view layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main power supply input | Accepts 8–14V DC input; powers internal circuitry and gate driver; UVLO activates below 7.5V. |
| VO | Regulated LNB output | Delivers final 13.3–19.3V output; capable of sourcing/sinking current for capacitive LNB loads up to 0.75µF. |
| SELVTOP | Hardware voltage range select | Low = 13/14V range; High = 18/19V range; active only when I²C VSPEN bit = 0. |
| EXTM | External DiSEqC modulation input | Accepts externally modulated 22kHz tone envelope; transfers symmetrically to VO for DiSEqC command injection. |
| FLT | Fault interrupt output | Open-drain signal asserted low on overtemperature, overcurrent, UVLO, or I²C reset; requires external pull-up. |
| SDA / SCL | I²C bidirectional data/clock | Standard two-wire interface (up to 400kHz); supports remote configuration and real-time diagnostics readback. |
| TDIN / TDOUT | Tone decoder input/output | TDIN monitors VOUT via 10nF coupling; TDOUT asserts low when 17.5–26.5kHz tone detected; used for DiSEqC feedback. |
| TCAP | Output slew rate control | External capacitor (typically 0.1µF) sets VO rise/fall time; prevents overshoot and limits peak inductor current. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DiSEqC 22kHz tone generator | Factory-trimmed oscillator eliminates external components and calibration; supports both internal and external modulation paths. |
| Dual-mode output voltage control | I²C software control (VTOP/VBOT) + hardware pin (SELVTOP) enables flexible system-level or board-level voltage selection. |
| Programmable dynamic current limiting | Four user-selectable thresholds (305–890mA) with 51ms ON / 900ms OFF fault cycling reduce power dissipation during sustained shorts. |
| Backward current protection | Detects >140mA reverse current; enters 2ms ON / 50ms OFF clamping mode to prevent damage from miswired LNB cables. |
| Comprehensive fault diagnostics | I²C-readable flags (OTF, OLF, BCF, CABF, OU/VF) and open-drain FLT pin provide deterministic root-cause identification. |
Applications
| Satellite Set-Top Box LNB Power | Personal Video Recorder (PVR) Tuner Module |
|---|---|
|
Use Scenario: Powering a single-feed LNB in consumer satellite STBs with DiSEqC-compatible dish switching. IC Role / Device Role / Timing Role: Primary LNB supply regulator and DiSEqC command injector; delivers stable 13.3V/18.3V output and injects 22kHz tone bursts. Use Value: Eliminates discrete boost + LDO + tone generator design; reduces BOM count by ≥7 components while maintaining EUTELSAT compliance. |
Use Scenario: Supporting dual-tuner PVR systems where one tuner connects to a legacy non-DiSEqC LNB requiring fixed 13.3V/14.3V bias. IC Role / Device Role / Timing Role: Programmable voltage regulator with pin-selectable output range; enables polarization switching without firmware update. Use Value: Hardware SELVTOP pin allows field-serviceable voltage reconfiguration; avoids costly PCB respins for regional LNB variants. |
| LNB Cable Fault Detection System | Industrial Satellite Receiver Front-End |
|
Use Scenario: Detecting open-circuit or shorted coaxial cable between STB and LNB in field-deployed units. IC Role / Device Role / Timing Role: Real-time current monitoring via CS pin and CABF flag; reports cable integrity status over I²C. Use Value: Enables automated diagnostics in service menus; reduces technician dispatches by identifying cable faults before tuner initialization. |
Use Scenario: Providing robust LNB power in harsh-environment receivers operating continuously in −20°C to +85°C ambient. IC Role / Device Role / Timing Role: Industrial-grade regulator with thermal shutdown, backward leakage tolerance, and 150°C junction protection. Use Value: Ensures uninterrupted operation under thermal stress; eliminates need for external thermal sensors or redundant regulators. |
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 |
|---|---|---|---|
| ISL6423ERZ | Same silicon die but in 24-lead QFN (4×4 mm); θJA = 38°C/W vs. 35°C/W for EPTSSOP; no SELVTOP pin - voltage selection I²C-only. | Preferred for space-constrained layouts; lacks hardware voltage toggle; requires full I²C initialization for every power cycle. | Select ISL6423ERZ only when PCB area is critical and firmware fully controls voltage selection; avoid if field-serviceable hardware switching is needed. |
| MAX2102ETJ+ | Maxim integrated LNB controller; 13/18V outputs; 22kHz tone; but no DiSEqC decoder (TDIN/TDOUT), no backward leakage protection, and no cable fault detection. | Supports basic LNB bias but lacks DiSEqC feedback loop and reverse-current safety features required for modern STBs. | Choose MAX2102ETJ+ only for cost-sensitive legacy designs without DiSEqC diagnostics or cable fault reporting requirements. |
Compared with ISL6423ERZ and MAX2102ETJ+, the ISL6423BEVEZ uniquely combines hardware-based voltage selection (SELVTOP), full DiSEqC encode/decode capability, 28V backward leakage tolerance, and integrated cable fault detection - making it the only option supporting field-serviceable, diagnostics-enabled, and safety-certified satellite front-ends.
Availability
ISL6423BEVEZ is available at Aetrix Electronics and suitable for satellite set-top box manufacturing, personal video recorder development, and industrial satellite receiver production requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6423BEVEZ 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 acquired Intersil in 2017 and maintains full technical and supply chain continuity for its precision analog and power management portfolio.
The ISL6423BEVEZ belongs to Renesas' satellite communication power management product line, engineered specifically for single-tuner LNB supply and DiSEqC control in consumer and industrial STB applications.
FAQ
What is the maximum output current capability of the ISL6423BEVEZ under industrial temperature conditions?
The ISL6423BEVEZ delivers up to 750mA continuous output current at +25°C. At +85°C ambient, the EPTSSOP package's thermal derating curve (Figure 2, FN6412) limits usable current to approximately 650mA. This is confirmed by the absolute maximum ratings and typical performance curves in the official datasheet - no extrapolation or estimation is applied. The ISL6423BEVEZ maintains regulation within spec across this range when proper PCB copper pour and thermal vias are implemented.
How does the ISL6423BEVEZ implement DiSEqC tone decoding, and what pins are involved?
The ISL6423BEVEZ decodes incoming 22kHz DiSEqC tones using the TDIN pin, which receives the signal via a 10nF AC-coupling capacitor from VO. The internal tone decoder operates across 17.5–26.5kHz, with threshold configurable via TXT pin (200mV receive / 400mV transmit) and TTH bit. Detection result appears on open-drain TDOUT, while status is reported in the BCF bit of SR1. This functionality is explicitly documented in the Functional Description and Electrical Specifications sections of the ISL6423BEVEZ datasheet.
Can the ISL6423BEVEZ operate without an I²C host controller, and if so, how is output voltage selected?
Yes - the ISL6423BEVEZ supports pin-strapped operation. When the I²C VSPEN bit is set low, the SELVTOP pin directly selects output range: low = 13.3V/14.3V (VBOT-controlled), high = 18.3V/19.3V (VTOP-controlled). This allows basic voltage selection without I²C initialization. However, features like current limiting thresholds, tone enable, and diagnostics remain inaccessible without I²C access. This behavior is defined in Table 1 and Functional Description of the ISL6423BEVEZ datasheet.
What protection mechanisms does the ISL6423BEVEZ provide against reverse polarity or back-fed voltage from the LNB?
The ISL6423BEVEZ provides three layers of reverse-voltage protection: (1) 28V maximum backward voltage tolerance on VO, (2) backward current detection threshold of 140mA (typical), and (3) automatic 2ms ON / 50ms OFF clamping mode that asserts BCF flag and holds VO at fault voltage until condition clears. These protections are verified in the Electrical Specifications (IBKTH, IBKLM, VOBK) and Functional Description sections of the ISL6423BEVEZ datasheet.
Is the 22kHz tone generator in the ISL6423BEVEZ adjustable or factory-fixed?
The 22kHz tone generator in the ISL6423BEVEZ is factory-trimmed and fixed - no external resistor, capacitor, or calibration is required. Its frequency is specified as 20–24kHz (±10%), with typical value 22kHz, and is derived from an internal 440kHz oscillator (20×22kHz). This is explicitly stated in the "TONE OSCILLATOR" section of the Electrical Specifications and confirmed in the Functional Description. No adjustment mechanism exists in the ISL6423BEVEZ silicon.
ISL6423BEVEZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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:
- 28-TSSOP-EP
ISL6423BEVEZ FAQ
1.How can I place an order for ISL6423BEVEZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6423BEVEZ 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 ISL6423BEVEZ reliable?
The price and inventory of ISL6423BEVEZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6423BEVEZ is usually 5 days.
3.What payment methods are accepted for ISL6423BEVEZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6423BEVEZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6423BEVEZ?
ISL6423BEVEZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6423BEVEZ 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 ISL6423BEVEZ?
For technical support, including ISL6423BEVEZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6423BEVEZ requirements.
6.How does Aetrix verify that ISL6423BEVEZ is sourced from the original manufacturer or authorized distributors?
All ISL6423BEVEZ 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 ISL6423BEVEZ meets industry standards.
7.What is the process for return or replacement of ISL6423BEVEZ?
All ISL6423BEVEZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL6423BEVEZ, 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 ISL6423BEVEZ part is unused and in its original packaging.
Return procedure for ISL6423BEVEZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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