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Renesas ISL6405ER-T
- Part No.:
- ISL6405ER-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ISL6405ER-T.pdf
- Description:
- IC REG CONV SATELLIT 2OUT 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,360
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Product details
Overview
ISL6405ER-T from Intersil is a dual-output LNB supply and control voltage regulator with integrated I²C interface, designed for satellite set-top box applications. It delivers independently programmable 13V/18V outputs (±0.26V accuracy), supports 750mA continuous current per channel, incorporates factory-trimmed 22kHz tone generation for DiSEqC encoding, and features digital cable length compensation (+1V). It powers two low-noise blocks (LNBs) simultaneously in dual-tuner systems.
For engineers reviewing the ISL6405ER-T datasheet, ISL6405ER-T pinout, ISL6405ER-T application, or ISL6405ER-T equivalent, key selection considerations include dual-channel independent voltage selection via I²C, dynamic overcurrent protection with programmable thresholds (425mA/775mA), thermal shutdown at 150°C, QFN-32 package compatibility, and DiSEqC-compliant 22kHz tone modulation with DSQIN pin control.
Technical Context
The ISL6405ER-T integrates two independent current-mode boost PWM controllers feeding low-noise linear regulators, enabling constant dropout voltage (~1.2V) across each pass element while supporting coaxial tone injection. Its internal 220kHz oscillator drives both PWMs and is derived from a factory-trimmed 22kHz tone generator compliant with EUTELSAT DiSEqC standards.
All functions-including VSEL1/VSEL2 (13V/18V), LLC1/LLC2 (±1V line compensation), ENT1/ENT2 (tone enable), EN1/EN2 (standby), and ISEL1/ISEL2 (overcurrent threshold)-are controlled via an 8-bit I²C system register (SR1/SR2) with slave address 000100XX, operating at up to 400kHz with full 3.3V/5V logic compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 13V or 18V per channel (±0.26V), selectable via I²C or SEL18V pins on QFN package |
| Max Output Current | 750mA continuous per channel; supports simultaneous dual-LNB operation |
| Tone Frequency | 22kHz ±2kHz factory-trimmed; enables DiSEqC encoding without external components |
| Overcurrent Threshold | Programmable: 425mA (ISEL=LOW) or 775mA (ISEL=HIGH); supports dynamic cycling (900ms OFF / 20ms ON) |
| Line Compensation | +1V per channel via LLC bit; compensates coaxial voltage drop without external circuitry |
| I²C Interface | Slave address 000100XX; 3.3V/5V compatible; up to 400kHz fast-mode operation |
| Thermal Protection | Shuts down at 150°C junction temperature; resumes at 135°C hysteresis |
Pinout & Package
ISL6405ER-T uses a 32-lead 5×5 mm QFN package (JEDEC MO-220 VHHD-2), with exposed thermal pad for enhanced heat dissipation. Pin count and layout match the ISL6405ER variant; Pb-free version designated by "Z" suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main power supply input | Accepts 8V–14V input; powers internal circuitry and charge pump |
| VO1 / VO2 | Dual regulated LNB output terminals | Deliver final 13V/18V ±0.26V to LNB-A and LNB-B via coaxial cable |
| SCL / SDA | I²C bus clock and data lines | Enable remote configuration of voltage, tone, enable, and protection settings |
| DSQIN1 / DSQIN2 | DiSEqC tone modulation inputs | Direct-pin 22kHz burst control for LNB-A/B; overrides I²C ENT bits when asserted |
| SEL18V1 / SEL18V2 | Hardware voltage select pins | Force 18V output per channel; available only on QFN package (ISL6405ER-T) |
| TCAP1 / TCAP2 | Rise/fall time setting capacitors | External 1µF capacitor sets ~3.4ms output transition time; prevents PWM overcurrent during startup |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LNB power channels | Enables true 2-tuner/2-dish operation with fully separate voltage, tone, and protection control |
| Integrated 22kHz tone generator | Factory-trimmed to ±2kHz; eliminates need for external oscillator or trimming components |
| Dynamic overcurrent protection | Auto-cycles between 900ms shutdown and 20ms current-limited retry; reduces thermal stress during shorts |
| Digital line length compensation | 1V boost per channel via LLC bit; maintains LNB bias voltage across long coax runs without analog feedback |
| QFN-32 near chip-scale footprint | 5×5 mm body with exposed thermal pad; improves thermal performance vs. SOIC while reducing PCB area |
Applications
| Satellite STB Dual-Tuner Power | DiSEqC Positioner Control |
|---|---|
Use Scenario: Simultaneous reception from two satellite positions using dual LNBs in one set-top box chassis. IC Role / Device Role / Timing Role: ISL6405ER-T provides independent 13V/18V bias and 22kHz tone to each LNB, enabling concurrent tuning and DiSEqC switching. Use Value: Eliminates need for two discrete LNB power ICs; reduces BOM count and layout complexity while ensuring precise tone timing for reliable DiSEqC command execution. | Use Scenario: Controlling motorized dish positioners that require burst-modulated 22kHz signals to select orbital slots. IC Role / Device Role / Timing Role: ISL6405ER-T generates factory-calibrated 22kHz tone with <14µs rise/fall time, modulated via DSQIN pins for DiSEqC burst encoding. Use Value: Guarantees compliant DiSEqC waveform timing without external filtering or calibration; supports fast positioner response and error-free slot selection. |
| LNB Bias with Coaxial Drop Compensation | Thermally Constrained STB Designs |
Use Scenario: Long coaxial cable runs (>30m) causing >1V DC drop between STB and LNB, risking undervoltage shutdown. IC Role / Device Role / Timing Role: ISL6405ER-T applies +1V line length compensation (LLC bit) to maintain ≥13V at LNB input under load. Use Value: Prevents LNB brownout without increasing PCB trace width or adding external boost circuitry; maintains stable operation across installation variations. | Use Scenario: Compact set-top boxes with limited airflow where LNB power ICs must operate reliably at 85°C ambient. IC Role / Device Role / Timing Role: ISL6405ER-T integrates thermal shutdown (150°C trip) and automatic recovery (135°C hysteresis), reporting status via OTF flag on I²C. Use Value: Enables safe operation in thermally dense enclosures; allows firmware to log overheating events and throttle other subsystems preemptively. |
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 |
|---|---|---|---|
| MAX2222AETG+ | Single-channel LNB supply; no integrated 22kHz tone generator; requires external oscillator for DiSEqC | Not suitable for dual-LNB or DiSEqC-only designs without added components | Select only for cost-sensitive single-tuner STBs where tone generation is handled externally |
| LM43603PWPR | 3.5V–36V synchronous buck regulator; no LNB-specific features (tone, VSEL, DSQIN, DiSEqC support) | Requires full external circuitry for LNB bias, tone injection, and protocol encoding | Use only for custom LNB power designs where full flexibility outweighs integration benefits |
Compared with MAX2222AETG+ and LM43603PWPR, the ISL6405ER-T uniquely combines dual-channel 13V/18V regulation, factory-trimmed 22kHz tone, DiSEqC pin control, and digital line compensation in a single QFN package-reducing design effort and component count for satellite STB applications.
Availability
ISL6405ER-T is available at Aetrix Electronics and suitable for satellite set-top box production, personal video recorder development, and dual-LNB antenna system integration requiring stable component supply and long-term lifecycle support.
Supply support for ISL6405ER-T 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
Intersil Corporation (now part of Renesas Electronics) is a U.S.-based analog and power management IC designer known for high-reliability satellite, industrial, and communications solutions.
The ISL6405 product line was engineered specifically for advanced satellite receiver power architectures, integrating LNB bias, DiSEqC control, and coaxial compensation into a single mixed-signal IC to simplify STB design and improve signal integrity.
FAQ
What is the maximum continuous output current per channel for the ISL6405ER-T?
The ISL6405ER-T delivers up to 750mA continuous current per output channel (VO1 and VO2). This rating is valid across the full operating temperature range (-20°C to +85°C) and supports simultaneous dual-LNB operation without derating. The device includes programmable overcurrent protection thresholds (425mA or 775mA) and dynamic fault recovery to maintain reliability under transient overload conditions.
How does the ISL6405ER-T implement DiSEqC-compatible 22kHz tone generation?
The ISL6405ER-T integrates a factory-trimmed 22kHz oscillator (±2kHz tolerance) compliant with EUTELSAT DiSEqC standards. Tone modulation is controlled either via the I²C ENT1/ENT2 bits or directly through the DSQIN1/DSQIN2 pins, enabling burst-mode encoding with ≤14µs rise/fall time. The tone amplitude is 680mV typical, with 50% duty cycle, and requires no external components for standard implementation.
Can the ISL6405ER-T compensate for voltage drop across long coaxial cables?
Yes. The ISL6405ER-T includes digital line length compensation (LLC) that adds +1V to the selected output voltage (13V or 18V) per channel when the LLC1 or LLC2 bit is set HIGH via I²C. This feature maintains minimum required LNB bias voltage at the antenna end of long coaxial runs without requiring external sensing or feedback circuitry.
What package type and pin count does the ISL6405ER-T use?
The ISL6405ER-T uses a 32-lead 5×5 mm QFN package (JEDEC MO-220 VHHD-2) with an exposed thermal pad. It is identical in footprint and pinout to the ISL6405ER, and the "-T" suffix denotes tape-and-reel packaging. This near chip-scale package offers superior thermal performance and smaller PCB area versus the EPSOIC variant.
Does the ISL6405ER-T support hardware-based voltage selection independent of I²C?
Yes. The ISL6405ER-T QFN package includes dedicated SEL18V1 and SEL18V2 pins that force the respective output to 18V when driven HIGH, overriding the I²C VSEL bits. This enables fast, non-processor-dependent voltage switching for legacy or safety-critical LNB control paths, while retaining full I²C programmability for dynamic configuration.
ISL6405ER-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Converter, Satellite Set-Top Box Designs
- Voltage - Input:
- 8V ~ 14V
- Number of Outputs:
- 2
- Voltage - Output:
- 13V ~ 18V
- Operating Temperature:
- -20°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
ISL6405ER-T FAQ
1.How can I place an order for ISL6405ER-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6405ER-T 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 ISL6405ER-T reliable?
The price and inventory of ISL6405ER-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6405ER-T is usually 5 days.
3.What payment methods are accepted for ISL6405ER-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6405ER-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6405ER-T?
ISL6405ER-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6405ER-T 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 ISL6405ER-T?
For technical support, including ISL6405ER-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6405ER-T requirements.
6.How does Aetrix verify that ISL6405ER-T is sourced from the original manufacturer or authorized distributors?
All ISL6405ER-T 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 ISL6405ER-T meets industry standards.
7.What is the process for return or replacement of ISL6405ER-T?
All ISL6405ER-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6405ER-T, 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 ISL6405ER-T part is unused and in its original packaging.
Return procedure for ISL6405ER-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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