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Renesas ISL85033IRTZ-T7A
- Part No.:
- ISL85033IRTZ-T7A
- Manufacturer:
- Renesas
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
ISL85033IRTZ-T7A.pdf
- Description:
- IC REG BUCK ADJ 3A SGL/DL 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,493
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Product details
Overview
ISL85033IRTZ-T7A from Renesas Electronics is a dual-channel synchronous buck regulator IC delivering 3A continuous output current per channel, operating from 4.5V to 28V input, with peak current-mode control, adjustable 300kHz–2MHz switching frequency, and independent power-good monitoring - used in FPGA, STB, and LCD panel power rails.
For engineers reviewing the ISL85033IRTZ-T7A datasheet, ISL85033IRTZ-T7A pinout, ISL85033IRTZ-T7A application, or ISL85033IRTZ-T7A equivalent, key selection criteria include dual-output tracking capability, thermal overload protection at +150°C, BOOT undervoltage detection, 2ms internal soft-start, and TQFN-28 package compatibility with high-density PCB layouts.
Technical Context
The ISL85033IRTZ-T7A integrates two independent peak current-mode PWM controllers, each driving an internal N-channel MOSFET (RDS(on) = 75–150 mΩ) with external Schottky diode rectification. It supports in-phase or out-of-phase operation via SYNCIN logic level and enables four output sequencing modes: independent, sequential, ratiometric, or absolute.
Each channel features dedicated COMP and FB pins for external loop compensation, SS pins for soft-start timing (2ms internal default), and open-drain PGOOD outputs with 91–94% rising threshold. The FS pin allows resistor-programmable frequency or external synchronization from 300kHz to 2MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V - supports wide-input industrial and telecom DC supplies without pre-regulation. |
| Output Current (per channel) | 3A continuous - sufficient for core logic rails of FPGAs and SoCs with margin for transient loads. |
| Switching Frequency | 300kHz to 2MHz - adjustable via FS pin resistor or SYNCIN; enables optimization of size vs. efficiency trade-offs. |
| Reference Voltage | 0.792V to 0.808V - tight 1% tolerance enables accurate low-voltage regulation (e.g., 0.8V core rails). |
| Thermal Shutdown | +150°C with 20°C hysteresis - protects against sustained overload or poor heatsinking in enclosed systems. |
| Power-Good Threshold | Rising: 91–94% of VOUT - ensures reliable system enable signaling before downstream logic powers up. |
| Soft-Start Time | 1.5ms to 3.5ms (typ. 2ms) - prevents inrush current damage to input capacitors and upstream converters. |
Pinout & Package
The ISL85033IRTZ-T7A is housed in a 4mm × 4mm, 28-lead Thin Quad Flat No-Lead (TQFN) RoHS-compliant package with exposed thermal pad (PD) soldered to SGND for optimal thermal performance (θJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 / VIN2 | Input power supply for respective channel | Accepts 4.5V–28V; requires ≥10µF ceramic decoupling per input near the pin. |
| PHASE1 / PHASE2 | Switch node output | Connects internal high-side MOSFET drain to external inductor and Schottky diode cathode. |
| BOOT1 / BOOT2 | Floating gate drive supply | Requires external bootstrap capacitor (CBOOT) from BOOTx to PHASEx for high-side driver operation. |
| FB1 / FB2 | Feedback input | Sense point for voltage regulation loop; sets output via resistor divider to 0.8V reference. |
| COMP1 / COMP2 | Error amplifier output | Provides compensation node for external Type II/III network to stabilize current-mode loop. |
| SS1 / SS2 | Soft-start control | Capacitor-to-ground sets ramp rate; tied to VCC for fixed 2ms internal soft-start. |
| PGOOD1 / PGOOD2 | Open-drain power-good flag | Pulled low during soft-start or if VOUT drops below 82.5–85.5% of target; internal 5MΩ pull-up. |
| SYNCIN / SYNCOUT | Frequency synchronization I/O | SYNCIN accepts 300kHz–2MHz clock (negative edge); SYNCOUT provides inverted signal for multi-phase coordination. |
| FS | Frequency select | Tied to VCC for 500kHz default; resistor to GND adjusts frequency from 300kHz to 2MHz. |
| EN1 / EN2 | Enable control | Active-high; >2V enables channel; <0.8V disables; no internal debouncing required. |
| SGND | Signal ground reference | All analog signals referenced here; exposed pad must be connected to SGND plane with multiple vias. |
| PGND1 / PGND2 | Power ground return | High-current return path for respective channel; connect directly to system GND plane. |
| VCC | Internal 5V LDO output | Supplies bias for internal circuitry; decouple with ≥4.7µF ceramic to PGND; max load 10mA. |
| NC | No connection | Pin 26 is unconnected internally; must remain floating or grounded per layout best practice. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck regulators | Enables separate 3A rails (e.g., 5V + 3.3V) with independent enable, soft-start, and PGOOD signaling. |
| Selectable phase relationship | SYNCIN logic level configures 0° (in-phase) or 180° (out-of-phase) operation to reduce input ripple current. |
| Four output sequencing modes | Supports independent startup, sequential ramp, ratiometric tracking, or absolute voltage alignment for complex power-up sequences. |
| Integrated thermal and overcurrent protection | Auto-shutdown at +150°C junction temperature and OCP threshold of 4.1–6.1A per channel with 60ns blanking. |
| External loop compensation | COMP/FB interface allows custom Type II/III compensation for stability across varied output capacitor ESR/ESL. |
| Boot undervoltage detection | Prevents high-side MOSFET misfiring by disabling gate drive if BOOTx falls below 10% of VCC. |
Applications
| FPGA Core & I/O Power | Set-Top Box Mainboard |
|---|---|
Use Scenario: Powering Xilinx Artix-7 FPGA banks requiring tightly regulated 1.0V core and 1.8V I/O rails with fast transient response. IC Role / Device Role / Timing Role: Dual-channel buck regulator providing independent, sequenced 3A outputs with PGOOD monitoring for safe configuration loading. Use Value: Eliminates need for discrete controllers and external MOSFETs; reduces BOM count and layout area while maintaining ±1% output accuracy. | Use Scenario: Delivering 5V/3A and 3.3V/3A to demodulator ICs, tuners, and HDMI interface circuitry in cable/satellite STBs. IC Role / Device Role / Timing Role: Primary DC/DC converter supplying main logic rails with in-phase operation to minimize input capacitor stress. Use Value: Wide 4.5–28V input accommodates varying AC adapter outputs; 500kHz default frequency balances efficiency and filter size. |
| LCD Panel Backlight & Logic | HDD/DVD Drive Power |
Use Scenario: Generating 12V backlight supply and 5V logic rail for smart TV LCD modules with thermal derating in confined enclosures. IC Role / Device Role / Timing Role: Dual buck controller operating in out-of-phase mode to halve input ripple current and reduce EMI filtering requirements. Use Value: Integrated thermal shutdown (+150°C) prevents latch-up during sustained backlight load; TQFN-28 enables compact front-panel layout. | Use Scenario: Providing 5V/3A and 12V/3A to spinning HDD actuators and DVD laser drivers where input voltage varies from 12V to 24V battery sources. IC Role / Device Role / Timing Role: High-VIN buck regulator supporting direct battery connection without intermediate pre-regulation stage. Use Value: 28V absolute maximum input withstands automotive load-dump transients; BOOT UV detection avoids shoot-through during cold cranking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2491DS-LF-Z | Single-channel 3A buck; no dual output or sequencing; fixed 500kHz; smaller 3mm×3mm QFN-16 | Only suitable when one regulated rail is needed; lacks PGOOD, SYNC, or tracking features | Choose for cost-sensitive single-rail designs where board space is critical and sequencing is unnecessary. |
| TPS543320RTVR | Dual 3A buck with integrated MOSFETs and PMBus interface; 4.5–18V input; 300kHz–2MHz sync; 0.6V ref | Supports digital telemetry and dynamic voltage scaling; higher pin count (32-pin VQFN); requires PMBus host | Choose when telemetry, remote configuration, or tighter voltage margins (<±0.5%) are required in server or telecom systems. |
Compared with MP2491DS-LF-Z and TPS543320RTVR, the ISL85033IRTZ-T7A offers native dual-output sequencing and analog-only control simplicity, making it ideal for cost-optimized consumer electronics where digital interfaces add unnecessary complexity and overhead.
Availability
ISL85033IRTZ-T7A is available at Aetrix Electronics and suitable for FPGA power, set-top box mainboards, and LCD panel applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL85033IRTZ-T7A 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 is a global semiconductor leader delivering microcontrollers, analog power, and connectivity solutions for automotive, industrial, and IoT markets.
The ISL85033 belongs to Renesas' high-voltage analog power management portfolio, designed specifically for compact, efficient dual-rail DC/DC conversion in space-constrained consumer and industrial equipment.
FAQ
What is the maximum input voltage rating for the ISL85033IRTZ-T7A?
The ISL85033IRTZ-T7A has an absolute maximum input voltage rating of +30V across VIN1 and VIN2 pins, though its recommended operating range is 4.5V to 28V. Operation above 28V is not guaranteed for parametric performance or reliability, and sustained exposure beyond 30V may cause permanent damage. Always observe the -0.3V to +30V rating relative to GND.
Does the ISL85033IRTZ-T7A require external MOSFETs or only an external diode?
The ISL85033IRTZ-T7A integrates internal N-channel high-side MOSFETs but requires external Schottky diodes for synchronous rectification - not external MOSFETs. Each channel uses one external Schottky diode (e.g., B340B) connected between PHASEx and VOUTx. No external low-side MOSFETs are needed, simplifying design versus fully discrete synchronous buck topologies.
How does the ISL85033IRTZ-T7A handle output voltage sequencing between channels?
The ISL85033IRTZ-T7A supports four sequencing modes via configuration of SS1, SS2, and SYNCIN: independent (each channel starts on its own ENx), sequential (one follows the other), ratiometric (outputs track proportionally), or absolute (both reach target simultaneously). Sequencing behavior is controlled by resistor/capacitor networks on SS pins and logic level on SYNCIN, enabling precise power-up order for mixed-voltage SoC systems.
Can the ISL85033IRTZ-T7A operate in forced continuous conduction mode (FCCM)?
No, the ISL85033IRTZ-T7A operates exclusively in peak current-mode PWM mode with diode emulation disabled. It does not support FCCM or pulse-frequency modulation (PFM) modes. At light loads, it enters discontinuous conduction mode (DCM) naturally due to valley current dropping to zero, which is confirmed by typical performance curves showing reduced efficiency below ~0.5A per channel.
What is the purpose of the NC pin (Pin 26) on the ISL85033IRTZ-T7A?
Pin 26 is a true no-connect (NC) terminal with no internal bond wire or circuit connection. It must remain electrically floating in the PCB layout; grounding or routing signals to this pin is prohibited. Its presence maintains mechanical symmetry in the TQFN-28 package and aids in automated optical inspection - it serves no electrical function in the ISL85033IRTZ-T7A.
ISL85033IRTZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1 or 2
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 3A
- Frequency - Switching:
- 300kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TQFN (4x4)
ISL85033IRTZ-T7A FAQ
1.How can I place an order for ISL85033IRTZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85033IRTZ-T7A 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 ISL85033IRTZ-T7A reliable?
The price and inventory of ISL85033IRTZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85033IRTZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL85033IRTZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85033IRTZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85033IRTZ-T7A?
ISL85033IRTZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85033IRTZ-T7A 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 ISL85033IRTZ-T7A?
For technical support, including ISL85033IRTZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85033IRTZ-T7A requirements.
6.How does Aetrix verify that ISL85033IRTZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL85033IRTZ-T7A 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 ISL85033IRTZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL85033IRTZ-T7A?
All ISL85033IRTZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL85033IRTZ-T7A, 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 ISL85033IRTZ-T7A part is unused and in its original packaging.
Return procedure for ISL85033IRTZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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