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Renesas ISL6423BEVEZ-T
- Part No.:
- ISL6423BEVEZ-T
- Manufacturer:
- Renesas
- Category:
- Special Purpose Regulators
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
ISL6423BEVEZ-T.pdf
- Description:
- IC REG CONV SATELL 1OUT 28TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,087
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Product details
Overview
ISL6423BEVEZ-T from Renesas (formerly Intersil) is a single-output LNB supply and control voltage regulator with integrated I²C interface, designed for satellite set-top box antenna port power delivery. It integrates a current-mode boost PWM, low-noise linear regulator, 22kHz tone generator, DiSEqC modulation circuitry, and fault diagnostics - delivering 13.3V/14.3V or 18.3V/19.3V output at up to 750mA continuous current for single-tuner LNB operation.
For engineers reviewing the ISL6423BEVEZ-T datasheet, ISL6423BEVEZ-T pinout, ISL6423BEVEZ-T application, or ISL6423BEVEZ-T equivalent, this device serves as a complete LNB power and control solution requiring no external tone oscillator, minimal passive components, and full I²C-configurable voltage selection, cable fault detection, and backward current protection in satellite receiver front-end designs.
Technical Context
The ISL6423BEVEZ-T employs a current-mode boost converter feeding a linear post-regulator to maintain constant ~0.8V dropout across the pass element - enabling efficient tone injection while minimizing thermal dissipation. Its internal 22kHz oscillator is factory-trimmed per EUTELSAT DiSEqC standards and supports both internal tone modulation via EXTM and external DiSEqC envelope injection.
I²C-controlled registers manage VTOP/VBOT bits for 13.3V/14.3V/18.3V/19.3V output selection, dynamic overcurrent limiting (four programmable thresholds), thermal shutdown (150°C), and diagnostic flags (OTF, OLF, BCF, CABF). The SELVTOP pin provides hardware-selectable voltage range switching when VSPEN = 0, decoupling I²C traffic from critical polarization control timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 13.3V, 14.3V, 18.3V, or 19.3V - digitally selectable via I²C or SELVTOP pin for vertical/horizontal LNB polarization control |
| Continuous Output Current | 750mA - sufficient to drive standard single-LNB loads with margin for cable losses and transient surges |
| Tone Frequency | 22kHz ±10% - factory-trimmed oscillator compliant with DiSEqC 1.0/1.1/1.2 protocols without calibration |
| Dynamic Overcurrent Thresholds | 305mA / 570mA / 705mA / 890mA - digitally programmable via ISELH/ISELL bits for adaptive short-circuit protection |
| Backward Leakage Limit | 28V reverse voltage tolerance - prevents damage when higher-voltage LNB lines are accidentally connected |
| I²C Interface | 400kHz fast-mode compatible, 7-bit slave address 0x14 (000100XX), 2.5V/3.3V/5V logic level tolerant |
| Operating Temperature | –20°C to +85°C - qualified for consumer STB environments with thermal shutdown at 150°C junction |
Pinout & Package
ISL6423BEVEZ-T is housed in a 28-lead EPTSSOP package (M28.173B), thermally enhanced with exposed pad for improved heat dissipation in compact STB PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main power input | 8V–14V supply for internal circuitry and gate driver; UVLO triggers at 7.5V |
| VO | Regulated LNB output | Delivers final 13.3V/14.3V/18.3V/19.3V to antenna port; supports back-bias up to 28V |
| SELVTOP | Voltage range select | Hardware toggle: LOW → 13V/14V range; HIGH → 18V/19V range (when VSPEN = 0) |
| EXTM | External DiSEqC input | Accepts modulated 22kHz envelope for symmetric injection onto VO; enables burst coding |
| TDIN/TDOUT | Tone decode interface | TDIN receives tone from VO via 10nF coupling; TDOUT open-drain flag indicates tone detection |
| FLT | Fault interrupt output | Open-drain active-low signal indicating OTF, OLF, BCF, or UVLO - triggers host MCU diagnostic read |
| SDA/SCL | I²C bidirectional bus | Standard two-wire interface for register access, configuration, and real-time status reporting |
| ADDR0/ADDR1 | Slave address pins | Set LSBs of I²C address (0x14–0x17); allow up to four ISL6423B devices on same bus |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DiSEqC 22kHz tone generation | Factory-trimmed oscillator eliminates external crystal and reduces BOM count by one component |
| Dual-mode voltage selection | I²C software control (VTOP/VBOT) + hardware pin (SELVTOP) enables flexible system-level or real-time polarization switching |
| Programmable dynamic overcurrent protection | Four selectable current limits (305–890mA) adapt protection threshold to cable length and LNB load variation |
| Backward current fault management | Detects >140mA reverse current and enters 2ms ON / 50ms OFF cycling mode to prevent latch-up and thermal runaway |
| Cable fault detection (CABF) | Monitors output current to distinguish open-cable (<2mA) vs. shorted-cable (>20mA) conditions for automatic diagnostics |
| Thermal shutdown with hysteresis | Shuts down at 150°C junction, resumes at 130°C - prevents repeated cycling and ensures safe recovery |
Applications
| Satellite LNB Power Supply | DiSEqC 1.x Command Transmission |
|---|---|
Use Scenario: Powering a single-feed LNB in a consumer satellite set-top box with dual-band (low/high) and dual-polarization (H/V) support. IC Role / Device Role / Timing Role: Primary LNB voltage regulator and DiSEqC interface controller; delivers stable DC output while injecting 22kHz tone for band selection and polarity switching. Use Value: Eliminates need for discrete boost converter, linear regulator, tone generator, and DiSEqC buffer - reducing board area by >40% versus discrete solutions. |
Use Scenario: Transmitting DiSEqC positioner commands (e.g., "move east") from STB to motorized dish actuator via coaxial cable. IC Role / Device Role / Timing Role: Tone modulator and line driver; accepts TTL-level DiSEqC data on EXTM and superimposes it onto the 13–19V DC supply with precise 22kHz carrier. Use Value: Supports burst-mode DiSEqC encoding with <10µs tone rise/fall time - meeting EUTELSAT timing requirements for reliable command reception. |
| LNB Fault Diagnostics | Multi-LNB System Coordination |
Use Scenario: Detecting and reporting LNB cable faults (open, short, water ingress) during STB boot or channel scan. IC Role / Device Role / Timing Role: Real-time current monitor and diagnostic flag generator; reports CABF, OLF, BCF, and OTF status via I²C registers and FLT pin. Use Value: Enables automated field-service diagnostics without external test equipment - reducing return rates and service calls. |
Use Scenario: Coordinating voltage and tone output across multiple ISL6423B devices in a multi-tuner PVR platform. IC Role / Device Role / Timing Role: I²C-addressable node (0x14–0x17) with synchronized soft-start and independent register sets for per-tuner control. Use Value: Allows simultaneous LNB powering and DiSEqC addressing without bus contention - essential for twin-tuner or quad-LNB architectures. |
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 |
|---|---|---|---|
| MAX2100AETX+T | Single 13.5V/18.5V output; no integrated DiSEqC decoder; requires external tone source for DiSEqC transmit | Lacks TDIN/TDOUT tone detection; limited to basic voltage switching without DiSEqC feedback | Choose when DiSEqC receive capability is unnecessary and cost sensitivity outweighs feature completeness |
| STV0900BQTR | Integrated DVB-S2 demodulator + LNB supply; 13.5V/18.5V outputs; supports 22kHz tone but no EXTM modulation path | Combines RF demodulation and power control - not suitable as standalone LNB supply replacement | Choose only for full tuner SoC integration; not a drop-in substitute for ISL6423BEVEZ-T's dedicated power/control role |
Compared with MAX2100AETX+T and STV0900BQTR, the ISL6423BEVEZ-T uniquely combines full DiSEqC 1.x transmit/receive, hardware-selectable voltage ranges, and comprehensive fault diagnostics in a dedicated power IC - making it optimal for high-reliability satellite STB front-ends where LNB interoperability and field diagnostics are critical.
Availability
ISL6423BEVEZ-T is available at Aetrix Electronics and suitable for satellite set-top box production, personal video recorder development, and LNB module manufacturing requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL6423BEVEZ-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
Renesas Electronics acquired Intersil in 2017 and maintains its high-performance analog and power management portfolio for communications infrastructure and consumer electronics.
The ISL6423BEVEZ-T belongs to Renesas' satellite front-end power management product line, engineered specifically for low-noise, high-reliability LNB supply and DiSEqC control in next-generation digital satellite receivers.
FAQ
What is the maximum continuous output current supported by the ISL6423BEVEZ-T?
The ISL6423BEVEZ-T delivers up to 750mA continuous output current at VO, verified across –20°C to +85°C ambient. Derating applies above 60°C per Figure 2 in the datasheet; at 85°C, max output drops to ~650mA. This rating ensures robust operation into typical LNB loads including 75Ω coaxial cable and active feedhorn circuits without thermal throttling under normal STB airflow conditions. The ISL6423BEVEZ-T maintains regulation within ±200mV load regulation spec across the full 0–750mA range.
How does the ISL6423BEVEZ-T implement DiSEqC tone detection and transmission?
The ISL6423BEVEZ-T implements DiSEqC tone detection via TDIN/TDOUT pins: TDIN receives the 22kHz tone from VO through a 10nF AC-coupling capacitor, and the internal decoder asserts TDOUT low when tone is present. For transmission, the EXTM pin accepts externally generated DiSEqC envelopes (or enables internal tone modulation via ENT bit), which are symmetrically injected onto VO. The ISL6423BEVEZ-T supports both modes with <10µs tone rise/fall time and factory-trimmed 22kHz frequency - eliminating external tone generation components.
Can the ISL6423BEVEZ-T be used with both 13V and 18V LNBs in the same design?
Yes - the ISL6423BEVEZ-T supports 13.3V/14.3V (low-band) and 18.3V/19.3V (high-band) outputs via I²C register bits VTOP/VBOT or hardware pin SELVTOP. When VSPEN = 0, SELVTOP directly selects voltage range; when VSPEN = 1, I²C controls all four voltages. This dual-mode flexibility allows a single ISL6423BEVEZ-T design to serve global LNB standards (e.g., 13V/18V in Europe, 14V/19V in Asia) without hardware changes - simplifying inventory and enabling firmware-based regional configuration.
What fault conditions trigger the FLT pin on the ISL6423BEVEZ-T?
The FLT pin on the ISL6423BEVEZ-T asserts low for five distinct fault conditions: overtemperature (OTF), overload (OLF), backward current fault (BCF), cable fault (CABF), or undervoltage lockout (UVLO). Each condition sets a corresponding bit in I²C Status Register SR1, allowing the host MCU to read the exact cause. FLT remains asserted until the fault clears and the I²C EN bit is toggled or power is cycled - ensuring no fault goes unlogged in production STB diagnostics.
Is the ISL6423BEVEZ-T RoHS-compliant and lead-free?
Yes - the ISL6423BEVEZ-T is RoHS-compliant and Pb-free, manufactured using Intersil's Pb-free plus anneal process with 100% matte tin plate termination finish. It meets IPC/JEDEC J-STD-020 reflow profiles for both SnPb and Pb-free soldering, and is rated MSL3. The "-T" suffix denotes tape-and-reel packaging, and the EPTSSOP package (M28.173B) is fully compatible with modern SMT assembly lines requiring lead-free compliance.
ISL6423BEVEZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) 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:
- 13.3V ~ 18.3V, 14.3V ~ 19.3V
- Operating Temperature:
- -20°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP-EP
ISL6423BEVEZ-T FAQ
1.How can I place an order for ISL6423BEVEZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL6423BEVEZ-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 ISL6423BEVEZ-T reliable?
The price and inventory of ISL6423BEVEZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL6423BEVEZ-T is usually 5 days.
3.What payment methods are accepted for ISL6423BEVEZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL6423BEVEZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL6423BEVEZ-T?
ISL6423BEVEZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL6423BEVEZ-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 ISL6423BEVEZ-T?
For technical support, including ISL6423BEVEZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL6423BEVEZ-T requirements.
6.How does Aetrix verify that ISL6423BEVEZ-T is sourced from the original manufacturer or authorized distributors?
All ISL6423BEVEZ-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 ISL6423BEVEZ-T meets industry standards.
7.What is the process for return or replacement of ISL6423BEVEZ-T?
All ISL6423BEVEZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL6423BEVEZ-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 ISL6423BEVEZ-T part is unused and in its original packaging.
Return procedure for ISL6423BEVEZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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