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Renesas ISL85033IRTZ
- Part No.:
- ISL85033IRTZ
- Manufacturer:
- Renesas
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
ISL85033IRTZ.pdf
- Description:
- IC REG BUCK ADJ 3A SGL/DL 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:633
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Product details
Overview
ISL85033IRTZ 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 core voltage regulation and LCD panel power supplies.
For engineers reviewing the ISL85033IRTZ datasheet, ISL85033IRTZ pinout, ISL85033IRTZ application, or ISL85033IRTZ equivalent, key selection considerations include dual-output tracking/sequencing capability, external Schottky diode requirement, thermal performance in 4mm×4mm TQFN, and boot undervoltage protection for reliable startup under transient input conditions.
Technical Context
The ISL85033IRTZ integrates two independent peak current-mode PWM controllers, each driving an internal N-channel MOSFET (75–150mΩ RDS(on)) with external Schottky diode rectification. It supports in-phase or out-of-phase operation via SYNCIN logic level, and offers four output sequencing modes: independent, sequential, ratiometric, or absolute.
Each channel features dedicated soft-start (2ms internal default), error amplifier (205µA/V transconductance), 0.8V reference (±1% over temperature), and overcurrent protection with 4.1–6.1A threshold. Thermal shutdown activates at +150°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 28V - supports wide-range industrial and telecom DC inputs including 12V/24V rails and battery-backed systems. |
| Output Current per Channel | 3A continuous - enables dual-rail point-of-load conversion for FPGA I/O and core supplies without external current sharing circuitry. |
| Switching Frequency | 300kHz to 2MHz - adjustable via FS pin resistor or external SYNCIN; higher frequencies reduce inductor size but increase switching loss. |
| Reference Voltage | 0.8V ±1% - sets output voltage via external resistor divider; enables precise low-voltage regulation down to 0.8V for modern SoC cores. |
| Thermal Shutdown Threshold | +150°C with 20°C hysteresis - protects against sustained overload or poor PCB thermal design while allowing brief high-temp operation. |
| Power-Good Accuracy | ±5.5% trip window (91–94% rise / 82.5–85.5% fall) - ensures reliable system enable/disable signaling during brownout or soft-start transitions. |
| Soft-Start Time | 2ms internal default (adjustable via SS1/SS2 capacitor) - prevents inrush current damage to input capacitors and downstream loads during power-up. |
Pinout & Package
The ISL85033IRTZ is housed in a 28-lead 4mm × 4mm Thin Quad Flat No-Lead (TQFN) package with exposed thermal pad (PD), RoHS-compliant, rated for -40°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN1 / VIN2 | Input power supply pins | Accept 4.5V–28V; require ≥10µF ceramic decoupling each; feed internal LDO and power stage. |
| PHASE1 / PHASE2 | Switch node outputs | Connect to inductor and cathode of external Schottky diode; drive high-side MOSFET source. |
| BOOT1 / BOOT2 | Bootstrap supply pins | Provide gate drive voltage for internal N-MOSFETs; require external bootstrap capacitor to PHASE. |
| FB1 / FB2 | Feedback inputs | Monitor output voltage via resistor divider; set regulation point and enable power-good detection. |
| PGOOD1 / PGOOD2 | Open-drain status outputs | Assert low during soft-start or undervoltage; include 5MΩ internal pull-up; interface directly with FPGA reset logic. |
| EN1 / EN2 | Enable inputs | Active-high (≥2V); allow independent channel control; no internal debouncing - external filtering required. |
| SYNCIN / SYNCOUT | Synchronization interface | SYNCIN accepts 300kHz–2MHz clock (negative-edge triggered); SYNCOUT provides inverted signal for multi-phase coordination. |
| FS | Frequency select | Tie to VCC for 500kHz; connect resistor to GND for 300kHz–2MHz adjustment; sets oscillator base frequency. |
| SS1 / SS2 | Soft-start timing | Capacitor-to-ground sets ramp rate; tie to VCC for fixed 2ms soft-start; supports sequencing control. |
| SGND | Signal ground | Reference for all analog circuits; exposed pad must be soldered to SGND plane with multiple vias for thermal and noise integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent buck regulators | Enables separate 3A outputs with programmable sequencing - eliminates need for two discrete converters in space-constrained FPGA or STB designs. |
| Selectable in-phase/out-of-phase operation | Reduces input ripple current by 50% in out-of-phase mode - lowers input capacitor stress and EMI in shared VIN applications. |
| Four output tracking modes | Supports absolute, ratiometric, sequential, or independent startup - satisfies complex power-up requirements of multi-rail processors and ASICs. |
| Integrated 5V LDO (VCC) | Provides bias for internal circuitry; delivers up to 10mA; requires 4.7µF ceramic decoupling - removes need for external bias rail. |
| Boot undervoltage detection | Prevents MOSFET shoot-through during low-VIN startup by disabling gate drive until BOOT voltage exceeds 4.5V - improves reliability in automotive cold-crank scenarios. |
| Peak current-mode control | Improves line transient response and simplifies loop compensation - allows use of smaller output capacitors and standard ferrite-core inductors. |
Applications
| Application 1 | Application 2 |
|---|---|
Use Scenario: Powering dual-rail FPGA I/O banks and core logic simultaneously from a single 12V input rail. IC Role / Device Role / Timing Role: Dual-channel buck regulator providing independently regulated 3.3V/1.2V outputs with ratiometric sequencing to meet FPGA power-up timing specs. Use Value: Reduces BOM count vs. two discrete regulators; 4mm×4mm footprint saves >30% PCB area; thermal pad enables 3A/channel without heatsink. | Use Scenario: Supplying main 5V and auxiliary 3.3V rails in LCD TV power subsystems with tight EMI limits. IC Role / Device Role / Timing Role: Dual buck controller operating out-of-phase at 1MHz to minimize input ripple and conducted emissions. Use Value: Achieves >90% efficiency at full load (VIN=12V); SYNCIN allows synchronization to system clock to avoid beat frequencies. |
| Application 3 | Application 4 |
Use Scenario: Generating 5V and 1.8V for set-top box SoC and memory interfaces where thermal density is constrained. IC Role / Device Role / Timing Role: Dual buck regulator with independent EN1/EN2 control enabling dynamic power gating of unused subsystems. Use Value: 20µA shutdown current per channel extends standby battery life; thermal shutdown prevents field failures in sealed enclosures. | Use Scenario: Providing redundant 3A outputs in cable modem power architecture requiring fault isolation. IC Role / Device Role / Timing Role: Dual-channel regulator with independent OCP and PGOOD signals enabling channel-level fault reporting and graceful degradation. Use Value: Overcurrent protection triggers at 5.1A typical with 60ns blanking - avoids false trips during load transients while protecting external diodes. |
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 integrated LDO; requires external bootstrap capacitor; 4.5–36V input; fixed 500kHz frequency. | Lacks dual-output capability and sequencing - suitable only when one regulated rail is needed. | Choose MP2491DS-LF-Z for cost-sensitive single-rail designs where board space permits two ICs instead of one dual-channel solution. |
| TPS543320RHLT | Dual 3A buck with integrated MOSFETs and synchronous rectification; 4.5–18V input; 300kHz–2MHz adjustable frequency; no external diode required. | Higher integration eliminates Schottky diode BOM item and improves light-load efficiency; narrower VIN range limits 24V system use. | Choose TPS543320RHLT when synchronous operation and diode elimination outweigh need for 28V input support. |
Compared with MP2491DS-LF-Z and TPS543320RHLT, the ISL85033IRTZ uniquely balances wide 28V input capability, external diode flexibility for thermal management, and comprehensive sequencing - making it optimal for industrial and broadcast equipment where input voltage margin and startup control are critical.
Availability
ISL85033IRTZ is available at Aetrix Electronics and suitable for FPGA power delivery, LCD panel power supplies, and set-top box DC/DC conversion requiring stable component supply across extended temperature and long product lifecycles.
Supply support for ISL85033IRTZ 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 specializing in microcontrollers, analog power management, and timing solutions for industrial, automotive, and infrastructure markets.
The ISL85033IRTZ belongs to Renesas' ISL85xx family of wide-input dual buck regulators, designed specifically for high-density point-of-load applications demanding flexible sequencing, robust thermal performance, and compatibility with legacy diode-based layouts.
FAQ
What is the maximum input voltage supported by the ISL85033IRTZ?
The ISL85033IRTZ supports a maximum input voltage of +30V on VIN1/VIN2 pins under absolute maximum ratings, but its recommended operating range is 4.5V to 28V. Operation above 28V risks exceeding thermal limits and reducing reliability; the device includes UVLO that disables switching below 3.9V (rising) to prevent unstable startup.
Does the ISL85033IRTZ require an external Schottky diode, and why?
Yes, the ISL85033IRTZ requires an external Schottky diode for each channel because it uses a non-synchronous buck topology with an internal high-side N-MOSFET and no integrated low-side switch. The Schottky diode provides the return path during the off-time; using a low-forward-voltage diode like B340B minimizes conduction loss and maintains >90% efficiency at 3A.
How does the ISL85033IRTZ handle output voltage sequencing between channels?
The ISL85033IRTZ supports four sequencing modes: independent, sequential, ratiometric, and absolute - configured via SS1/SS2 pins and external capacitors. In sequential mode, CH2 starts only after CH1 reaches regulation; in ratiometric mode, both outputs ramp proportionally. This eliminates need for external sequencer ICs in multi-rail SoC applications.
What thermal management provisions does the ISL85033IRTZ include?
The ISL85033IRTZ incorporates thermal overload protection triggering at +150°C junction temperature with 20°C hysteresis, and its 4mm×4mm TQFN package features an exposed thermal pad (PD) that must be soldered to SGND with ≥6 thermal vias. Its θJA is 38°C/W, enabling 3A/channel operation at +85°C ambient with minimal copper area.
Can the ISL85033IRTZ operate with only one channel enabled?
Yes, the ISL85033IRTZ allows independent channel control via EN1 and EN2 pins. Either channel can be disabled by pulling its EN pin low while the other remains active. When one channel is disabled, its PHASE pin floats, PGOOD goes low, and quiescent current drops to 20µA per disabled channel - supporting partial-power modes in adaptive systems.
ISL85033IRTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- 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 FAQ
1.How can I place an order for ISL85033IRTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85033IRTZ 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 reliable?
The price and inventory of ISL85033IRTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85033IRTZ is usually 5 days.
3.What payment methods are accepted for ISL85033IRTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85033IRTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85033IRTZ?
ISL85033IRTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85033IRTZ 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?
For technical support, including ISL85033IRTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85033IRTZ requirements.
6.How does Aetrix verify that ISL85033IRTZ is sourced from the original manufacturer or authorized distributors?
All ISL85033IRTZ 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 meets industry standards.
7.What is the process for return or replacement of ISL85033IRTZ?
All ISL85033IRTZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL85033IRTZ, 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 part is unused and in its original packaging.
Return procedure for ISL85033IRTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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