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Renesas ISL6421AER
- Part No.:
- ISL6421AER
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ISL6421AER.pdf
- Description:
- IC REG CONV SATELLIT 1OUT 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,691
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Product details
Overview
ISL6421AER from Intersil is a single-output LNB supply and control voltage regulator with I²C interface, integrating a current-mode boost PWM and low-noise linear regulator for satellite set-top box applications. It delivers 13V or 18V regulated output (±2.6% at 25°C), supports DiSEqC™ 22kHz tone generation, and provides 450mA typical output current with digital cable length compensation (+1V). Its QFN-32 package enables compact LNB power delivery in advanced STB modules.
For engineers reviewing the ISL6421AER datasheet, ISL6421AER pinout, ISL6421AER application, or ISL6421AER equivalent, key selection considerations include I²C-configurable 13/18V output selection, integrated 22kHz tone oscillator with DSQIN modulation input, dynamic overcurrent protection with 900ms off-time, thermal shutdown at 150°C, and QFN-32 package compatibility with JEDEC MO-220 VHHD-2 outline.
Technical Context
The ISL6421AER implements a two-stage architecture: a high-efficiency (>92%) current-mode boost PWM generates VSW, which feeds a low-dropout linear regulator to produce precise VOUT. The linear regulator's dropout is minimized by dynamically tracking VSW to VOUT + 1.2V (typ), reducing dissipation while enabling tone injection. The internal 220kHz oscillator drives both PWM and tone circuitry, with the 22kHz tone factory-trimmed and controllable via ENT bit or DSQIN pin.
I²C communication uses a fixed slave address (000100XX) supporting 400kHz fast-mode operation at 3.3V or 5V logic levels. System registers SR1/SR2 provide real-time diagnostics including Overload Flag (OLF) and Over Temperature Flag (OTF), both readable via I²C. Voltage selection (VSEL), line length compensation (LLC), enable (EN), and dynamic current limiting (DCL) are all software-controllable bits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 13V or 18V (±2.6% at 25°C); selectable via I²C VSEL bit or SEL18V pin on QFN package |
| Cable Compensation | +1V offset (LLC bit enabled); compensates coaxial voltage drop without external components |
| Output Current | 450mA typical; digitally programmable overcurrent limit (500–625mA range) |
| Tone Frequency | 22kHz ±10%; factory-trimmed, no external adjustment required for DiSEqC compliance |
| Efficiency | >92% at full load; achieved via current-mode boost PWM + linear post-regulator architecture |
| Thermal Protection | Shuts down at 150°C junction temperature; resumes at 130°C hysteresis for safe recovery |
| I²C Interface | 400kHz fast-mode compatible; 3.3V/5V tolerant; slave address 000100XX with ADDR pin selection |
Pinout & Package
ISL6421AER is housed in a 5×5 mm, 32-lead QFN package compliant with JEDEC MO-220 VHHD-2, featuring an exposed thermal pad for enhanced heat dissipation and near chip-scale footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | LNB supply output | Regulated 13V/18V output with ±2.6% accuracy; supports back-bias up to 24V |
| VSW | Linear regulator input | Boost converter output feeding linear stage; tracks VOUT + ~1.2V to minimize dropout loss |
| SDA / SCL | I²C bidirectional bus | Configures VSEL/LLC/EN/DCL bits and reads OLF/OTF diagnostic flags |
| DSQIN | Tone modulation input | Direct 22kHz tone enable/disable for burst DiSEqC encoding; overrides ENT bit when active |
| SEL18V | Hardware voltage select | Pin-strapped 13V/18V selection (HIGH = 18V); used independently of I²C for fixed configuration |
| TCAP | Rise/fall time control | External capacitor sets output transition timing (~3400 × C value); 1µF typical for 3.4ms transitions |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DiSEqC™ Tone Generator | Factory-trimmed 22kHz oscillator eliminates external crystal or RC network; supports EN/DSQIN dual control |
| Dynamic Overcurrent Protection | 900ms shutdown + 20ms current-limited retry cycle reduces average power during short-circuit faults |
| Low-Dropout Linear Regulation | 1.2V typical dropout at 450mA ensures minimal heat rise while enabling clean tone superposition on VOUT |
| I²C Diagnostics Visibility | Real-time OLF (overload) and OTF (over-temperature) flags readable via SR2 register for system-level fault logging |
| Back-Bias Protection | Withstands reverse voltage up to 24V on VOUT without damage or latch-up-critical for LNB hot-swap scenarios |
Applications
| Satellite LNB Power Delivery | DiSEqC™ Protocol Encoding |
|---|---|
Use Scenario: Providing stable DC power and control signals from STB to outdoor LNB unit over coaxial cable. IC Role / Device Role / Timing Role: Dual-stage regulator generating 13V/18V LNB supply while injecting 22kHz tone for band switching. Use Value: Eliminates need for discrete boost + LDO + tone generator; achieves >92% efficiency and ±2.6% output regulation. | Use Scenario: Enabling EUTELSAT-compliant DiSEqC message transmission to control multi-LNB switches or polarizers. IC Role / Device Role / Timing Role: Generates and modulates 22kHz carrier using DSQIN pin for burst-coded command sequences. Use Value: Fast DSQIN response (<14µs rise/fall) supports reliable DiSEqC 1.0/1.1/2.0 protocol timing without external tone circuitry. |
| Coaxial Cable Drop Compensation | Thermal-Safe LNB Power Management |
Use Scenario: Compensating for IR drop across long coaxial runs (up to 100m) in residential satellite installations. IC Role / Device Role / Timing Role: Digitally adds +1V to selected 13V/18V output via LLC bit to maintain minimum LNB operating voltage. Use Value: Maintains LNB functionality without recalculating external resistor networks or redesigning power stage. | Use Scenario: Preventing thermal runaway during sustained overload or ambient temperature excursions in sealed STB enclosures. IC Role / Device Role / Timing Role: Monitors die temperature and disables both PWM and linear regulators above 150°C, signaling via OTF flag. Use Value: Enables fail-safe shutdown and host MCU-triggered recovery without external thermal sensors or comparators. |
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 |
|---|---|---|---|
| MAX2221ETE+ | Single 13/18V output with I²C interface; lacks integrated 22kHz tone generator and DSQIN modulation pin | Requires external tone circuitry for DiSEqC; suitable for simpler LNB control where tone is generated elsewhere | Choose MAX2221ETE+ only if tone generation is handled externally and thermal flag visibility is not required |
| LM43603PWPR | 3.5V–36V input synchronous buck regulator; no LNB-specific features, I²C, tone, or diagnostics | Not a functional replacement; requires full custom design for LNB voltage selection, tone, and DiSEqC signaling | LM43603PWPR is not a direct alternative; use only in non-DiSEqC systems requiring high-efficiency DC/DC conversion |
Compared with MAX2221ETE+, ISL6421AER integrates DiSEqC-compliant tone generation and real-time diagnostics, eliminating external components and simplifying firmware. Compared with LM43603PWPR, ISL6421AER delivers purpose-built LNB functionality-including SEL18V pin, LLC compensation, and OLF/OTF flags-reducing BOM count and validation effort for satellite STB designs.
Availability
ISL6421AER is available at Aetrix Electronics and suitable for satellite set-top box power delivery, DiSEqC™ protocol encoding, and coaxial cable voltage compensation requiring stable component supply across industrial temperature ranges (-20°C to +85°C).
Supply support for ISL6421AER 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 mixed-signal semiconductor company specializing in power management, precision analog, and interface ICs.
The ISL6421AER belongs to Intersil's satellite communications power management product line, designed specifically to consolidate LNB supply, voltage selection, DiSEqC tone generation, and fault diagnostics into a single QFN device for next-generation STB platforms.
FAQ
What is the maximum output current capability of the ISL6421AER?
The ISL6421AER delivers 450mA typical output current. Its overcurrent limit is digitally programmable between 500mA and 625mA via the DCL bit and internal threshold. Under dynamic protection mode (DCL = LOW), it cycles between 900ms shutdown and 20ms current-limited operation during overload, ensuring safe thermal behavior while maintaining system responsiveness. This specification is confirmed in the Electrical Specifications table on page 4 of FN9167 Rev 3.00.
How does the ISL6421AER implement DiSEqC™ 22kHz tone generation?
The ISL6421AER includes a factory-trimmed 22kHz oscillator with ±10% accuracy, eliminating external components. Tone generation is controlled either via the ENT bit through I²C or directly via the DSQIN pin, enabling immediate burst modulation for DiSEqC commands. When ENT = HIGH, tone is continuous; when ENT = LOW, DSQIN toggling injects tone bursts. This dual-control architecture is detailed in the Functional Description section (page 6) and Table 5 of the ISL6421AER datasheet.
Can the ISL6421AER operate with both 3.3V and 5V I²C logic levels?
Yes, the ISL6421AER supports full I²C compatibility with both 3.3V and 5V logic systems, operating up to 400kHz fast-mode. Input logic thresholds are defined as VIH ≥ 0.7×VDD and VIL ≤ 0.3×VDD, and the SDA/SCL pins tolerate voltages up to 7V. This dual-voltage interoperability is verified in Table 8 (I²C Specifications) on page 9 of FN9167 Rev 3.00 and enables seamless integration with diverse microcontroller platforms.
What thermal protection mechanisms does the ISL6421AER provide?
The ISL6421AER incorporates junction temperature monitoring with automatic shutdown at 150°C (typical) and automatic recovery at 130°C (20°C hysteresis). When triggered, it disables both the boost PWM and linear regulator and asserts the OTF (Over Temperature Flag) bit in SR2, visible via I²C readback. This behavior is guaranteed by design per Note 5 on page 4 and described in the Thermal Protection section (page 7) of the datasheet.
Is the ISL6421AER pin-compatible with other members of the ISL6421 family?
Yes, the ISL6421AER shares identical pinout and package (QFN-32, 5×5 mm) with ISL6421AERZ and ISL6421AEVAL, as confirmed in the Ordering Information table (page 1) and Package Outline drawing (page 12) of FN9167 Rev 3.00. All variants use the same L32.5x5 package drawing and pin assignment, enabling direct substitution in PCB layouts where RoHS compliance or evaluation board use is the only differentiating factor.
ISL6421AER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-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:
- 13V ~ 18V
- Operating Temperature:
- -20°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
ISL6421AER FAQ
1.How can I place an order for ISL6421AER through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6421AER 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 ISL6421AER reliable?
The price and inventory of ISL6421AER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6421AER is usually 5 days.
3.What payment methods are accepted for ISL6421AER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6421AER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6421AER?
ISL6421AER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6421AER 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 ISL6421AER?
For technical support, including ISL6421AER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6421AER requirements.
6.How does Aetrix verify that ISL6421AER is sourced from the original manufacturer or authorized distributors?
All ISL6421AER 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 ISL6421AER meets industry standards.
7.What is the process for return or replacement of ISL6421AER?
All ISL6421AER units undergo pre-shipment inspection (PSI). If there is an issue with ISL6421AER, 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 ISL6421AER part is unused and in its original packaging.
Return procedure for ISL6421AER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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