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Renesas ISL6405EEBZ-T
- Part No.:
- ISL6405EEBZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ISL6405EEBZ-T.pdf
- Description:
- IC REG CONV SATELLIT 2OUT 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,086
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Product details
Overview
ISL6405EEBZ-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) to two low-noise blocks, supports 22kHz DiSEqC tone generation, provides 750mA continuous current per channel, and features digital line-length compensation (+1V step). It enables simultaneous dual-tuner operation over coaxial cable.
For engineers reviewing the ISL6405EEBZ-T datasheet, ISL6405EEBZ-T pinout, ISL6405EEBZ-T application, or ISL6405EEBZ-T equivalent, key selection criteria include dual-channel independent voltage select (VSEL1/VSEL2), dynamic current limiting (425mA/775mA), thermal shutdown at 150°C, I²C slave address 000100XX, and EPSOIC-28 package compatibility with Pb-free "Z" suffix.
Technical Context
The ISL6405EEBZ-T integrates two independent current-mode boost PWMs feeding low-noise linear regulators, enabling constant dropout voltage (~1.2V) across each pass element while supporting tone injection. Its internal 220kHz oscillator drives both PWMs and is factory-trimmed to generate a precise 22kHz tone for DiSEqC compliance.
All functions-including output voltage selection (13V/18V), line-length compensation (LLC), tone enable (ENT1/ENT2), and dynamic current limiting (DCL)-are controlled via an 8-bit I²C system register (SR1/SR2), with diagnostic flags (OLF1/OLF2, OTF) readable back over the same bus.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Options | 13V or 18V per channel, digitally selectable via I²C VSEL bits; ±0.26V tolerance ensures stable LNB bias under load. |
| Line-Length Compensation | +1V step per channel via LLC bit; compensates coaxial voltage drop without external components. |
| Continuous Output Current | 750mA per channel; sufficient to power standard dual-LNB configurations in STB designs. |
| 22kHz Tone Generation | Factory-trimmed 20–24kHz output; enables DiSEqC encoding via ENT/DSQIN pins or I²C control. |
| Current Limit Thresholds | Programmable 425mA (ISEL=LOW) or 775mA (ISEL=HIGH); supports safe start-up and short-circuit protection. |
| I²C Interface | Slave address 000100XX; 3.3V/5V compatible; up to 400kHz fast-mode operation for real-time LNB control. |
| Thermal Protection | Shuts down at 150°C junction temperature; resumes at 135°C hysteresis; prevents permanent damage during overload. |
Pinout & Package
ISL6405EEBZ-T uses the 28-lead EPSOIC (Exposed Pad Small Outline IC) package per JEDEC MO-220 M28.3B outline, with thermal pad exposed on underside for enhanced heat dissipation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main power input | Accepts 8–14V supply; powers internal circuitry and charge pump; UVLO triggers below 7.5V. |
| VO1 / VO2 | Regulated LNB output terminals | Deliver final 13V/18V ±0.26V to LNB-A/LNB-B; support simultaneous dual-tuner operation. |
| SCL / SDA | I²C clock/data lines | Enable bidirectional configuration and status readback; require external pull-ups; support 400kHz fast-mode. |
| ENT1 / ENT2 | Tone enable control inputs | Select 22kHz tone source: HIGH = internal generator; LOW = DSQIN1/DSQIN2 pin modulation. |
| DSQIN1 / DSQIN2 | DiSEqC burst input pins | Direct 22kHz tone injection for DiSEqC protocol encoding; fast response enables burst coding. |
| ADDR | I²C address select | GND = 0001000; VDD = 0001001; allows two ISL6405 devices on same I²C bus. |
Key Features
| Feature | Design Value |
|---|---|
| True dual-channel independence | Each output (VO1/VO2) has separate VSEL, LLC, ENT, and EN control bits-enables asymmetric LNB configurations (e.g., 13V + 18V). |
| Digital line-length compensation | LLC bit adds +1V to selected output voltage-eliminates need for external trim pots or feedback resistors in long-cable installations. |
| Dynamic current limiting | DCL bit enables auto-retry protection: 900ms off-time + 20ms current-limited on-time-reduces thermal stress during sustained shorts. |
| Integrated 22kHz DiSEqC oscillator | Factory-trimmed 22kHz ±10% with <14µs rise/fall time-meets EUTELSAT DiSEqC timing requirements without external crystal. |
| Pb-free EPSOIC packaging | "Z" suffix denotes matte tin termination and Pb-free molding compound-compliant with RoHS and compatible with SnPb/Pb-free reflow. |
Applications
| Dual-Tuner Satellite STB | Multi-Dish LNB Power Distribution |
|---|---|
Use Scenario: Simultaneous reception from two satellite positions using two independent tuners in a single set-top box chassis. IC Role / Device Role / Timing Role: Dual-channel LNB power supply and DiSEqC controller; provides synchronized 13V/18V bias and 22kHz tone to each LNB port. Use Value: Eliminates need for discrete DC-DC + linear regulator + tone generator combinations-reduces BOM count by >7 components per channel. |
Use Scenario: Feeding LNBs from two physically separate dishes (e.g., Hotbird + Astra) into one receiver with switchable inputs. IC Role / Device Role / Timing Role: Independent voltage and tone control per antenna port; supports different band selections (e.g., vertical/horizontal polarization) via VSEL/ENT bits. Use Value: Enables full DiSEqC 1.0/1.1 protocol support including positioner control and multi-switch addressing without external logic. |
| Professional Satellite Headend | DTV Personal Video Recorder (PVR) |
Use Scenario: Centralized LNB powering in multi-room or IPTV headend systems requiring high channel density and remote diagnostics. IC Role / Device Role / Timing Role: I²C-configurable dual supply with real-time OLF/OTF flag reporting-enables firmware-level fault detection and logging. Use Value: Reduces service calls via early overtemperature/overload detection; supports scheduled maintenance based on thermal history. |
Use Scenario: Integrated PVR with dual-tuner recording and live TV pause functionality requiring concurrent LNB control. IC Role / Device Role / Timing Role: Fast soft-start (512-cycle COMP ramp) and programmable TCAP-based output slew rate-prevents tuner lock loss during voltage transitions. Use Value: Ensures uninterrupted signal acquisition during channel changes; TCAP capacitor sets rise/fall time between 1.6–7.6ms for stable PLL lock. |
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 |
|---|---|---|---|
| MAX2105ETJ+T | Single-channel output; no integrated 22kHz oscillator; requires external tone generator for DiSEqC. | Limited to single-tuner or multiplexed dual-LNB systems; lacks independent LLC/VSEL per channel. | Choose only when dual-channel independence and embedded tone generation are not required. |
| LM43603PWPR | Standalone 3A synchronous buck regulator; no LNB-specific features (no tone gen, no DiSEqC interface, no VSEL/LLC bits). | Requires external linear post-regulator, I²C controller, and 22kHz circuit-increases design complexity and board area. | Use only in custom LNB power architectures where full flexibility outweighs integration benefits. |
Compared with MAX2105ETJ+T and LM43603PWPR, the ISL6405EEBZ-T uniquely combines dual independent LNB supplies, factory-trimmed 22kHz tone, and full I²C configurability in a single EPSOIC package-reducing solution size by ≥40% and eliminating 12+ external components typically needed for discrete implementations.
Availability
ISL6405EEBZ-T is available at Aetrix Electronics and suitable for satellite set-top box manufacturing, professional headend deployments, and DTV personal video recorder development requiring stable component supply and long-term production continuity.
Supply support for ISL6405EEBZ-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 STB power architectures-integrating LNB supply, DiSEqC control, and I²C configurability to replace multi-chip discrete solutions in space-constrained consumer electronics.
FAQ
What is the operating supply voltage range for the ISL6405EEBZ-T?
The ISL6405EEBZ-T operates from an 8V to 14V input supply. Its undervoltage lockout (UVLO) circuit disables all functions below 7.5V (typical start threshold) and re-enables them only after VCC rises above 7.95V, ensuring clean power-up sequencing. This range matches standard STB DC adapter outputs and supports robust operation across varying line conditions.
How does the ISL6405EEBZ-T implement DiSEqC-compatible 22kHz tone generation?
The ISL6405EEBZ-T contains a factory-trimmed 220kHz oscillator that divides by 10 to produce a precise 22kHz tone (20–24kHz range). Tone output is controlled via ENT1/ENT2 bits: when HIGH, internal tone is enabled regardless of DSQIN state; when LOW, DSQIN1/DSQIN2 pins directly modulate the output-supporting full DiSEqC burst encoding with <14µs edge rates.
Can the ISL6405EEBZ-T support different output voltages on each channel simultaneously?
Yes. The ISL6405EEBZ-T supports fully independent voltage selection per channel via VSEL1 and VSEL2 bits in its I²C system registers. For example, VO1 can be set to 13V while VO2 is set to 18V-enabling mixed LNB configurations (e.g., universal LNB on one port, legacy LNB on another) without hardware changes.
What thermal protection mechanisms does the ISL6405EEBZ-T include?
The ISL6405EEBZ-T incorporates junction-temperature sensing with shutdown at 150°C (typical) and automatic recovery at 135°C (typical hysteresis). When triggered, the OTF bit in System Register 2 goes HIGH and clears I²C data-requiring firmware to reinitialize EN bits after cooling. This prevents thermal runaway during sustained overload or poor heatsinking.
Is the ISL6405EEBZ-T pin-compatible with other variants in the ISL6405 family?
No. The ISL6405EEBZ-T uses the 28-lead EPSOIC package, while ISL6405ER/ERZ use a 32-lead QFN. Pin counts, layouts, and thermal pad configurations differ significantly-direct PCB replacement is not possible. However, functional register mapping and I²C command structure remain identical across all ISL6405 variants.
ISL6405EEBZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- 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:
- 28-SOIC
ISL6405EEBZ-T FAQ
1.How can I place an order for ISL6405EEBZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6405EEBZ-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 ISL6405EEBZ-T reliable?
The price and inventory of ISL6405EEBZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6405EEBZ-T is usually 5 days.
3.What payment methods are accepted for ISL6405EEBZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6405EEBZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6405EEBZ-T?
ISL6405EEBZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6405EEBZ-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 ISL6405EEBZ-T?
For technical support, including ISL6405EEBZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6405EEBZ-T requirements.
6.How does Aetrix verify that ISL6405EEBZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6405EEBZ-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 ISL6405EEBZ-T meets industry standards.
7.What is the process for return or replacement of ISL6405EEBZ-T?
All ISL6405EEBZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6405EEBZ-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 ISL6405EEBZ-T part is unused and in its original packaging.
Return procedure for ISL6405EEBZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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