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Renesas ISL6421AER-T
- Part No.:
- ISL6421AER-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ISL6421AER-T.pdf
- Description:
- IC REG CONV SATELLIT 1OUT 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,377
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Product details
Overview
ISL6421AER-T from Intersil is a single-output LNB supply and control voltage regulator with I²C interface, designed for satellite set-top box (STB) applications. It integrates a current-mode boost PWM and low-noise linear regulator to deliver regulated 13V/18V outputs, supports DiSEqC™ 22kHz tone generation, provides dynamic overcurrent protection up to 625mA, and features line-length compensation (+1V) for coaxial cable drop compensation.
For engineers reviewing the ISL6421AER-T datasheet, ISL6421AER-T pinout, ISL6421AER-T application, or ISL6421AER-T equivalent, key selection considerations include I²C-configurable output voltage (13V/18V), integrated 22kHz tone oscillator with DSQIN modulation input, thermal and overload diagnostics via I²C flags (OTF/OLF), QFN-32 package footprint, and 450mA typical continuous output capability.
Technical Context
The ISL6421AER-T employs a two-stage architecture: a high-efficiency (>92%) current-mode boost PWM generates VSW, which feeds an adjustable linear post-regulator delivering precise VOUT. The internal 220kHz oscillator drives both PWM and tone circuitry, with the 22kHz tone derived via ÷10 division and wave shaping - factory-trimmed and fully compatible with EUTELSAT DiSEqC™ standards.
I²C control enables real-time configuration of VSEL (13V/18V), LLC (+1V compensation), ENT (tone enable), DCL (dynamic/static current limiting), and EN (standby). Diagnostic bits OLF and OTF are readable in System Register 2, providing fault visibility without external sensors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Selectable 13.0V or 18.0V (±2.6%); +1V line-length compensation enabled via LLC bit |
| Max Output Current | 450mA typical continuous; 625mA dynamic overcurrent limit (DCL = L) |
| Tone Frequency | 22kHz ±10% (factory-trimmed); used for DiSEqC™ band switching and burst encoding |
| I²C Interface | Slave address 000100XX; supports 3.3V/5V logic; up to 400kHz fast-mode operation |
| Efficiency | >92% at 450mA load (VOUT = 14V, VIN = 12V) |
| Thermal Protection | Shuts down at 150°C junction; resumes at 130°C (20°C hysteresis) |
| Package | 32-pin QFN (5mm × 5mm, 0.5mm pitch); JEDEC MO-220 compliant; exposed thermal pad |
Pinout & Package
ISL6421AER-T is housed in a 32-lead QFN package (5×5 mm, 0.5 mm pitch) with exposed thermal pad per JEDEC MO-220 VHHD-2. Pin functions are validated per FN9167 Rev 3.00 datasheet, including dedicated PGND/SGND/AGND grounds, I²C SDA/SCL, DSQIN tone modulation input, SEL18V hardware voltage select, and TCAP timing capacitor terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | LNB supply output | Regulated 13V/18V output with back-bias protection to 24V; rise/fall time set by TCAP |
| DSQIN | Tone modulation control | Direct 22kHz tone enable/disable; allows immediate DiSEqC™ burst coding when ENT = L |
| SDA / SCL | I²C bidirectional bus | Configures VSEL, LLC, ENT, DCL, EN; reads OLF/OTF diagnostic flags |
| SEL18V | Hardware voltage select | Pin-strapped 13V/18V override (QFN only); must initialize I²C to 13V state when used |
| TCAP | Tone timing capacitor | External capacitor (≥1µF) sets 22kHz tone rise/fall time (~3400 × C value) |
| PGND | Power ground | Dedicated ground for PWM gate driver; must be shorted to SGND near device |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DiSEqC™ Tone Generator | Factory-trimmed 22kHz oscillator with DSQIN modulation input enables EUTELSAT-compliant burst encoding without external components |
| Dynamic Overcurrent Protection | Auto-cycling shutdown (900ms OFF / 20ms ON) reduces power dissipation during LNB short-circuit while maintaining start-up reliability |
| Coaxial Cable Compensation | Digital +1V LLC bit compensates for voltage drop across long coax runs, ensuring stable LNB bias under varying cable lengths |
| I²C Diagnostics Visibility | Overload (OLF) and overtemperature (OTF) flags readable in System Register 2 - no external monitoring circuitry required |
| Low-Dropout Linear Post-Regulator | Maintains constant ~1.2V dropout at 450mA, minimizing heat generation while enabling precise VOUT regulation and tone injection capability |
Applications
| Single-LNB Satellite STB | Multi-Switch DiSEqC™ Hub |
|---|---|
Use Scenario: Consumer satellite set-top box powering one LNB for standard reception. IC Role / Device Role / Timing Role: Primary LNB supply regulator and DiSEqC™ tone source; delivers stable 13V/18V bias and injects 22kHz tone for band selection. Use Value: Eliminates need for discrete boost + LDO + tone generator; reduces BOM count and PCB area while meeting EUTELSAT DiSEqC™ compliance. | Use Scenario: Central hub distributing signals to multiple LNBs via DiSEqC™ multi-switch. IC Role / Device Role / Timing Role: LNB power controller with burst-capable tone modulation; supports rapid DiSEqC™ command sequences for switch matrix addressing. Use Value: Fast DSQIN response (<14µs tone edge) enables reliable multi-switch communication; I²C register access allows firmware-controlled sequencing. |
| Universal LNB Power Module | Professional Satellite Receiver |
Use Scenario: Field-deployable LNB power board supporting legacy and DiSEqC™ LNBs. IC Role / Device Role / Timing Role: Dual-mode regulator - hardware SEL18V pin for fixed-voltage setups; I²C for remote reconfiguration in headend systems. Use Value: Hardware/software dual-control flexibility simplifies design reuse across product tiers; RoHS-compliant QFN enables compact, thermally robust layout. | Use Scenario: High-reliability professional receiver requiring fault logging and thermal management. IC Role / Device Role / Timing Role: Smart LNB power IC with embedded diagnostics - OLF/OTF flags reported over I²C for system-level health monitoring. Use Value: Enables predictive maintenance and automated fault reporting; thermal shutdown at 150°C prevents damage during sustained overload conditions. |
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 |
|---|---|---|---|
| MAX2202EASA+ | Fixed 13V/18V selection via pins; no I²C interface; no DiSEqC™ tone generation | Suitable for basic LNB bias only; lacks DiSEqC™ support and diagnostics | Choose when I²C control and tone modulation are unnecessary and cost sensitivity is high |
| LM43603PWPR | Standalone 3.5A synchronous buck regulator; no linear post-regulator, no tone circuit, no I²C | Requires external LDO + tone generator + logic for DiSEqC™; not a functional replacement | Use only as part of a custom LNB power solution where full integration is not required |
Compared with MAX2202EASA+ and LM43603PWPR, the ISL6421AER-T uniquely integrates I²C programmability, factory-trimmed 22kHz tone, DiSEqC™-ready modulation input, and on-chip diagnostics - eliminating four external ICs in satellite STB designs while enabling firmware-upgradable LNB control.
Availability
ISL6421AER-T is available at Aetrix Electronics and suitable for satellite set-top box development, DiSEqC™ multi-switch hubs, and universal LNB power modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6421AER-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-performance, application-specific solutions in communications, computing, and consumer electronics.
The ISL6421AER-T belongs to Intersil's satellite power management product line, engineered specifically to consolidate LNB supply, DiSEqC™ control, and diagnostics into a single QFN package for next-generation satellite STB platforms.
FAQ
What is the primary function of the ISL6421AER-T in satellite systems?
The ISL6421AER-T serves as a fully integrated LNB power supply and DiSEqC™ controller. It delivers regulated 13V or 18V DC to the low-noise block via a high-efficiency boost + linear architecture, generates and modulates a factory-trimmed 22kHz tone for band switching, and reports faults (overload, overtemperature) via I²C-readable flags - all within a single 5×5 mm QFN package.
How does the ISL6421AER-T implement DiSEqC™ compatibility?
The ISL6421AER-T implements DiSEqC™ compatibility through its built-in 22kHz tone generator (factory-trimmed to ±10%), DSQIN pin for direct tone modulation, and ENT bit control via I²C. When ENT = L, DSQIN toggling injects burst-encoded tone signals compliant with EUTELSAT DiSEqC™ protocols; when ENT = H, continuous tone is generated - enabling both legacy and advanced satellite command schemes.
Can the ISL6421AER-T operate without I²C communication?
Yes - the ISL6421AER-T can operate without active I²C communication using hardware controls. The SEL18V pin allows fixed 13V/18V selection, and DSQIN directly enables tone modulation. However, I²C is required to configure LLC (line-length compensation), DCL (current-limiting mode), and read diagnostic flags (OLF/OTF); UVLO ensures safe startup even if I²C remains inactive.
What is the role of the TCAP pin on the ISL6421AER-T?
TCAP sets the rise and fall time of the 22kHz tone output: a 1µF capacitor yields ~3.4ms edges, scaling linearly with capacitance (t ≈ 3400 × C). This ensures controlled tone transitions that avoid overshoot during DiSEqC™ burst encoding and prevent PWM overcurrent during VSW capacitor charging - critical for reliable multi-switch communication.
Does the ISL6421AER-T support both 3.3V and 5V I²C systems?
Yes - the ISL6421AER-T supports full 3.3V and 5V I²C operation up to 400kHz fast-mode. Its SDA and SCL inputs meet standard I²C logic thresholds (VIH ≥ 0.7×VDD, VIL ≤ 0.3×VDD), and internal level-shifting allows interoperability with mixed-voltage microcontrollers without external translators.
ISL6421AER-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:
- 1
- Voltage - Output:
- 13V ~ 18V
- Operating Temperature:
- -20°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
ISL6421AER-T FAQ
1.How can I place an order for ISL6421AER-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6421AER-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 ISL6421AER-T reliable?
The price and inventory of ISL6421AER-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6421AER-T is usually 5 days.
3.What payment methods are accepted for ISL6421AER-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6421AER-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6421AER-T?
ISL6421AER-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6421AER-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 ISL6421AER-T?
For technical support, including ISL6421AER-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6421AER-T requirements.
6.How does Aetrix verify that ISL6421AER-T is sourced from the original manufacturer or authorized distributors?
All ISL6421AER-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 ISL6421AER-T meets industry standards.
7.What is the process for return or replacement of ISL6421AER-T?
All ISL6421AER-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6421AER-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 ISL6421AER-T part is unused and in its original packaging.
Return procedure for ISL6421AER-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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