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Renesas ISL6405EEB
- Part No.:
- ISL6405EEB
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ISL6405EEB.pdf
- Description:
- IC REG CONV SATELLIT 2OUT 28SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ISL6405EEB from Intersil is a dual-output LNB supply and control voltage regulator IC designed for satellite set-top box (STB) modules, delivering independently programmable 13V/18V outputs with ±0.26V accuracy, 750mA continuous current per channel, integrated 22kHz tone generation for DiSEqC encoding, and I²C interface (000100XX address, up to 400kHz). It powers two low-noise blocks (LNBs) simultaneously via coaxial cable in dual-tuner architectures.
For engineers reviewing the ISL6405EEB datasheet, ISL6405EEB pinout, ISL6405EEB application, or ISL6405EEB equivalent, key selection considerations include dual-channel independent voltage selection (VSEL1/VSEL2), line-length compensation (LLC1/LLC2), dynamic overcurrent protection with programmable thresholds (425mA/775mA), thermal shutdown at 150°C, and EPSOIC-28 package compatibility with exposed pad thermal performance (θJA = 29°C/W).
Technical Context
The ISL6405EEB integrates two independent current-mode boost PWM controllers feeding low-noise linear post-regulators, enabling constant dropout voltage (~1.2V) across each pass element while supporting tone injection. Its internal 220kHz oscillator (10× tone frequency) drives both PWMs and the factory-trimmed 22kHz DiSEqC tone generator.
All functions-including output voltage (13V/18V), line-length compensation (+1V), tone enable (ENT1/ENT2), and dynamic current limiting-are controlled via an 8-bit I²C system register (SR1/SR2) with read-back diagnostic bits (OLF1/OLF2/OTF). The EPSOIC-28 package provides dedicated power grounds (PGND1/PGND2), analog/signal ground separation (AGND/SGND), and TCAP pins for output slew rate control (1.6–7.6ms).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Accuracy | ±0.26V at 13V/18V outputs - ensures stable LNB bias within EUTELSAT DiSEqC compliance limits |
| Max Continuous Output Current | 750mA per channel - supports full-power operation of two LNBs over coaxial cable |
| Line-Length Compensation | +1V step (LLC1/LLC2) - compensates for typical coaxial voltage drop without external circuitry |
| Tone Frequency | 22kHz ±2kHz (factory-trimmed) - meets DiSEqC 1.0/1.1/1.2 encoding requirements without calibration |
| I²C Interface Speed | Up to 400kHz fast-mode - enables rapid reconfiguration during tuner switching or band selection |
| Thermal Shutdown Threshold | 150°C (typical), with 20°C hysteresis - protects against sustained overload or poor heatsinking in enclosed STB chassis |
| Supply Voltage Range | 8V to 14V input - compatible with standard STB DC-DC intermediate bus rails |
Pinout & Package
ISL6405EEB uses a 28-lead Exposed Pad Small Outline Integrated Circuit (EPSOIC) package (JEDEC MO-220 M28.3B), featuring an exposed thermal pad for enhanced heat dissipation (θJC = 4°C/W). Pin count and function mapping are validated per Intersil FN9026.2 datasheet Figure 1 (top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main power supply input | Accepts 8–14V input; powers internal regulators, logic, and gate drivers |
| VO1 / VO2 | Dual regulated LNB output terminals | Deliver final 13V/18V ±0.26V to LNB-A/LNB-B via coaxial cable |
| SCL / SDA | I²C clock and bidirectional data lines | Enable remote configuration of VSEL, LLC, ENT, EN, and DCL bits at up to 400kHz |
| PGND1 / PGND2 | Power ground returns for PWM channels | Isolate high-current switching paths from signal ground to minimize noise coupling |
| AGND / SGND | Analog and small-signal ground references | Separate grounding preserves error amplifier stability and tone waveform fidelity |
| TCAP1 / TCAP2 | Output slew rate control capacitors | Set rise/fall times (1.6–7.6ms) to prevent PWM overcurrent during voltage transitions |
| DSQIN1 / DSQIN2 | Direct DiSEqC tone enable inputs | Allow immediate 22kHz burst modulation independent of I²C for real-time band switching |
| ADDR | I²C slave address select | GND = 0001000, >2.7V = 0001001 - supports dual ISL6405EEB devices on same bus |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LNB power channels | Simultaneous 13V/18V outputs with separate VSEL/LLC/ENT/EN control - enables true dual-tuner, dual-dish operation without cross-talk |
| Integrated DiSEqC 22kHz tone generator | Factory-trimmed 22kHz ±2kHz oscillator with DSQIN pin override - eliminates external crystal and reduces BOM cost |
| Dynamic overcurrent protection | Programmable 425mA/775mA thresholds with 900ms off-time/20ms on-time cycling - minimizes thermal stress during short-circuit events |
| Line-length compensation | Digital +1V boost per channel (LLC1/LLC2) - corrects coaxial voltage drop without manual resistor tuning |
| Thermal and fault diagnostics | Read-back OLF1/OLF2 (overload) and OTF (over-temperature) flags via I²C - enables real-time system health monitoring |
Applications
| Satellite Dual-Tuner STB | DiSEqC-Compatible LNB Control |
|---|---|
Use Scenario: Consumer satellite set-top box with two independent tuners receiving signals from separate orbital positions (e.g., Astra 19.2°E and Hotbird 13°E). IC Role / Device Role / Timing Role: ISL6405EEB supplies regulated 13V/18V to each LNB and generates synchronized 22kHz tone bursts for DiSEqC position switching. Use Value: Enables seamless multi-satellite reception with no manual dish repositioning; maintains <±0.26V output regulation across 12–750mA load range. |
Use Scenario: Professional satellite receiver requiring reliable DiSEqC 1.2 command execution for motorized dish control and multiswitch management. IC Role / Device Role / Timing Role: ISL6405EEB acts as the LNB power and tone interface, using DSQIN1/DSQIN2 pins for sub-microsecond tone edge timing critical for DiSEqC burst integrity. Use Value: Factory-trimmed 22kHz tone (20–24kHz) and <14µs rise/fall time ensure protocol-compliant signaling without external filtering or calibration. |
| Coaxial-Powered Dual-LNB System | Thermally Constrained STB Design |
Use Scenario: Compact satellite receiver where both LNBs are powered over shared coaxial cables with >30m length. IC Role / Device Role / Timing Role: ISL6405EEB applies LLC1/LLC2 to add +1V per channel, compensating for IR drop while maintaining 13V/18V nominal at LNB input. Use Value: Eliminates need for external boost circuits or oversized cabling; sustains LNB lock under worst-case 750mA load and 14V input. |
Use Scenario: Fanless, sealed-set-top box operating in ambient temperatures up to 65°C with limited PCB copper area. IC Role / Device Role / Timing Role: ISL6405EEB leverages its EPSOIC exposed pad (θJA = 29°C/W) and thermal shutdown (150°C) to prevent runaway during sustained 750mA/channel operation. Use Value: Internal OTF flag alerts host MCU before shutdown, allowing graceful tuner fallback; exposed pad reduces junction-to-ambient delta by >15°C vs. standard SOIC. |
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 |
|---|---|---|---|
| MAX22026ETJ+ | Single-channel 13/18V LNB controller with integrated 22kHz tone; no line-length compensation; TQFN-20 package | Requires two units for dual-LNB systems; lacks independent LLC per channel | Select when space-constrained single-tuner designs prioritize footprint over dual-channel integration |
| LM48002QMHX/NOPB | Automotive-grade dual 13/18V LNB supply; supports 4.5–18V input; includes built-in reverse-polarity protection | Higher quiescent current (5mA vs. 3mA); rated for -40°C to 125°C; targets automotive satellite radio | Select for harsh-environment deployments where extended temperature range and reverse-voltage tolerance outweigh STB-specific DiSEqC optimizations |
Compared with MAX22026ETJ+ and LM48002QMHX/NOPB, the ISL6405EEB uniquely delivers true dual-channel independence (VSEL/LLC/ENT per LNB), factory-trimmed DiSEqC tone, and EPSOIC thermal performance optimized for consumer STB cost and reliability targets - making it the only single-chip solution for mainstream dual-tuner satellite receivers.
Availability
ISL6405EEB is available at Aetrix Electronics and suitable for satellite set-top box manufacturing, DiSEqC-enabled LNB module assembly, and dual-tuner broadcast receiver development requiring stable component supply and long-term lifecycle support.
Supply support for ISL6405EEB 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 semiconductor company specializing in precision analog, power management, and interface ICs for communications, computing, and industrial markets.
The ISL6405EEB belongs to Intersil's satellite power management product line, engineered specifically for high-efficiency, compact LNB supply and DiSEqC control in advanced set-top box designs - balancing integration, thermal performance, and protocol compliance.
FAQ
What is the maximum continuous output current per channel for the ISL6405EEB?
The ISL6405EEB delivers 750mA of continuous current per output channel (VO1 and VO2) under specified thermal conditions. This rating assumes proper PCB layout with the exposed pad thermally connected to a sufficient copper area, and operation within the -20°C to +85°C ambient temperature range. Exceeding this current may trigger dynamic overcurrent protection or thermal shutdown.
Does the ISL6405EEB support DiSEqC 2.0 or higher protocol versions?
The ISL6405EEB supports DiSEqC 1.0, 1.1, and 1.2 through its factory-trimmed 22kHz tone generator and fast-response DSQIN1/DSQIN2 pins, which enable precise burst timing required for DiSEqC command framing. While it does not implement DiSEqC 2.0's bidirectional data layer (which requires additional UART-level processing), its tone generation and modulation capabilities are fully compliant with all DiSEqC 1.x physical-layer specifications referenced in EUTELSAT standards.
How does line-length compensation (LLC) work on the ISL6405EEB?
Line-length compensation on the ISL6405EEB is implemented digitally via the LLC1 and LLC2 bits in the I²C system registers. When LLC1 or LLC2 is set HIGH, the corresponding output voltage is increased by +1V (e.g., 13V → 14V or 18V → 19V), compensating for typical coaxial cable voltage drop over distances up to ~50m. This adjustment is applied to both the boost converter output and final linear regulator setpoint, preserving regulation accuracy and dropout margin.
Can the ISL6405EEB operate with a 5V I²C bus while powered from a 12V supply?
Yes, the ISL6405EEB supports full 3.3V/5V I²C operation up to 400kHz. Its SCL and SDA pins tolerate logic-high inputs up to 7V and conform to standard I²C electrical specifications (VIH ≥ 0.7×VDD, VIL ≤ 0.3×VDD). When VCC = 12V, the I²C interface remains compatible with 5V microcontrollers without level-shifting, provided pull-up resistors are connected to the 5V I²C bus rail.
What is the purpose of the TCAP1 and TCAP2 pins on the ISL6405EEB?
The TCAP1 and TCAP2 pins on the ISL6405EEB connect external capacitors (recommended 1.0µF) to control the rise and fall times of VO1 and VO2 outputs during voltage transitions (e.g., 13V ↔ 18V). The output slew rate is approximately 3400 × TCAP value, yielding 1.6–7.6ms for 0.47–2.2µF. This prevents inrush current from exceeding the PWM's overcurrent threshold during startup or mode changes.
ISL6405EEB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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
ISL6405EEB FAQ
1.How can I place an order for ISL6405EEB through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6405EEB 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 ISL6405EEB reliable?
The price and inventory of ISL6405EEB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6405EEB is usually 5 days.
3.What payment methods are accepted for ISL6405EEB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6405EEB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6405EEB?
ISL6405EEB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6405EEB 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 ISL6405EEB?
For technical support, including ISL6405EEB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6405EEB requirements.
6.How does Aetrix verify that ISL6405EEB is sourced from the original manufacturer or authorized distributors?
All ISL6405EEB 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 ISL6405EEB meets industry standards.
7.What is the process for return or replacement of ISL6405EEB?
All ISL6405EEB units undergo pre-shipment inspection (PSI). If there is an issue with ISL6405EEB, 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 ISL6405EEB part is unused and in its original packaging.
Return procedure for ISL6405EEB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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