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Renesas EL7554IREZ
- Part No.:
- EL7554IREZ
- Manufacturer:
- Renesas
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
EL7554IREZ.pdf
- Description:
- IC REG BUCK ADJ 4A 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,993
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Product details
Overview
EL7554IREZ from Intersil is a synchronous 4A step-down DC/DC regulator with integrated PMOS/NMOS power FETs, operating from 3V to 6V input and delivering adjustable output down to 0.8V. It achieves up to 96% efficiency at 4A load, supports 1MHz switching frequency, and includes junction temperature monitoring (VTJ), ±5% voltage margining (TM/SEL), and power-good (PG) signaling. It is used in FPGA core/I/O supplies requiring compact, thermally robust point-of-load regulation.
For engineers reviewing the EL7554IREZ datasheet, EL7554IREZ pinout, EL7554IREZ application, or EL7554IREZ equivalent, key selection considerations include its 28-lead HTSSOP package with exposed thermal pad, constant-frequency PWM control with external synchronization capability, 100% duty-cycle operation for near-VIN output, soft-start timing control via EN capacitor, and integrated current-sensing for fast transient response without external sense resistors.
Technical Context
The EL7554IREZ employs peak-current-mode control with on-chip resistorless current sensing derived from the high-side PMOS FET, enabling precise over-current protection and rapid load-step response. Its oscillator uses a relaxation comparator with externally adjustable frequency (200–1000 kHz) via COSC capacitor, and supports external synchronization with 20% frequency margin.
Thermal management relies on the exposed thermal pad of the HTSSOP-28 package, with θJA as low as 26°C/W on a 2-layer PCB; junction temperature is monitored directly via VTJ pin output (1.2V + 3.84mV/°C). Start-up sequencing is fully configurable using STP/STN tracking inputs and EN pin delay, supporting cascade, linear, offset, and adjustable soft-start modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4A continuous - supports FPGA core and DSP I/O rails without external current boosting |
| Input Voltage Range | 3V to 6V - compatible with single-cell Li-ion or 3.3V/5V system rails |
| Output Voltage Range | 0.8V to nearly VIN - enables 100% duty-cycle operation for ultra-low dropout applications |
| Switching Frequency | Up to 1MHz - allows use of small 2.2µH inductors and ceramic capacitors, fitting <0.58 in² layout |
| Efficiency | Up to 96% - minimizes power loss and thermal stress in space-constrained embedded systems |
| Reference Accuracy | ±1% (1.24–1.28V) - ensures tight output voltage regulation across line/load/temperature |
| Thermal Protection | 135°C shutdown with 20°C hysteresis - prevents permanent damage during sustained overload or poor airflow |
| Package | 28-lead HTSSOP with exposed thermal pad - requires soldered thermal pad and thermal vias for rated 4A performance |
Pinout & Package
The EL7554IREZ is housed in a 28-lead HTSSOP (MDP0048) package with an exposed thermal pad on the underside, requiring mandatory soldering to PCB copper for thermal conduction. Pin pitch is 0.65 mm; body dimensions are 9.7 mm × 6.4 mm × 1.2 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (COMP) | Error amplifier output | Connect Type-1 compensation network (RC/CC) to stabilize loop bandwidth at ~50kHz crossover |
| 3 (FB) | Feedback input | Resistor divider from VOUT sets output voltage per VO = 0.8V × (1 + R1/R2); also accepts speed-up capacitor |
| 8–13 (LX) | High-current switch node | 6 parallel pins carry full inductor current; average voltage equals regulated output; must minimize loop area with inductor |
| 16–18 (PGND) | Power ground return | Low-side FET source connection; separate from SGND and tied only at single point near SGND pin |
| 19–21 (VIN) | Main input supply | Connects to drain of high-side PMOS; requires low-ESR ceramic input capacitors placed adjacent to these pins |
| 22 (VDD) | Internal bias supply | Internally derived from VIN via 20Ω resistor; powers control circuitry; decouple with 0.01µF to SGND |
| 23 (PG) | Power-good indicator | Open-drain logic-high when VOUT is within ±10% of target; used for sequencing multiple regulators |
| 24 (EN) | Enable input | Active-high with 2.5µA internal pull-up; add capacitor for programmable start-up delay (TD ≈ CEN × VEN_HI/IEN) |
| 25 (STP), 26 (STN) | Tracking inputs | Differential pair for synchronized start-up with auxiliary supply; enables linear or offset tracking configurations |
| 27 (COSC) | Oscillator timing | Connects to external capacitor (220–390pF) to set switching frequency between 300–440kHz (typ.) |
| 28 (SGND) | Signal ground reference | Control circuit common; must be connected to PGND at one point only, adjacent to this pin |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PMOS/NMOS FETs | Eliminates need for external high-side boot circuitry and reduces BOM count by 4+ components |
| ±5% Voltage Margining | Configurable via TM/SEL pins to validate system stability during burn-in testing without hardware changes |
| Junction Temperature Monitor (VTJ) | Provides calibrated analog voltage (1.2V + 3.84mV/°C) for real-time die temperature measurement without external sensors |
| Full Start-Up Control | Supports four sequencing modes (adjustable soft-start, cascade, linear tracking, offset tracking) via STP/STN/EN |
| All-Ceramic Design Support | Enables complete use of X5R/X7R MLCCs for input/output filtering-no electrolytics required |
| Constant-Frequency PWM | Ensures predictable EMI profile and simplifies input filter design; supports external sync for multi-rail coherence |
Applications
| FPGA Core Supply | DSP I/O Power Rail |
|---|---|
Use Scenario: Powering 1.2V core and 1.8V I/O banks of Xilinx Artix-7 FPGA in industrial PLC controller. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering stable 4A at 1.2V with <10mV ripple under 2A step load. Use Value: Integrated margining validates FPGA timing margins during production test; VTJ pin enables real-time thermal derating in fanless enclosures. |
Use Scenario: Generating 2.5V I/O supply for TI C6748 DSP in medical ultrasound front-end. IC Role / Device Role / Timing Role: Synchronous buck converter with tight line/load regulation (<±0.5%) to maintain signal integrity on high-speed parallel buses. Use Value: 1MHz switching enables compact 2.2µH inductor and 47µF ceramic output cap, reducing board area by 35% vs. legacy 300kHz solutions. |
| CPU Core Voltage Regulator | Portable Equipment POL Converter |
Use Scenario: Providing 1.0V/3A core voltage for ARM Cortex-A9 dual-core SoC in ruggedized handheld terminal. IC Role / Device Role / Timing Role: High-efficiency (94% @ 3A) step-down regulator with UVLO and thermal shutdown for reliable operation in 85°C ambient. Use Value: 100% duty-cycle capability maintains regulation down to 3.0V input, extending battery runtime during deep discharge. |
Use Scenario: Compact 5V-to-3.3V conversion for USB-C PD-powered IoT sensor hub with space constraint <0.6 in². IC Role / Device Role / Timing Role: Single-chip solution with integrated FETs and all-ceramic support eliminates discrete MOSFETs and reduces component count by 6. Use Value: HTSSOP-28 thermal pad and 26°C/W θJA enable full 4A output without heatsink-critical for sealed plastic enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS544B20RTWR | 4A, 4.5–18V input, 0.6–5.5V output; 2MHz max freq; requires external bootstrap capacitor | Better suited for higher-input industrial rails; lacks integrated margining and VTJ monitor | Choose for >6V input systems where footprint and thermal pad layout differ significantly |
| MP2315GJ-Z | 4A, 4.5–28V input, 0.8–15V output; fixed 500kHz freq; no sync, no margining, no VTJ | Lower cost for non-critical consumer applications; no thermal monitoring or sequencing features | Choose when input exceeds 6V or when margining/thermal telemetry are unnecessary |
Compared with TPS544B20RTWR and MP2315GJ-Z, the EL7554IREZ uniquely combines 3–6V input compatibility, ±5% margining, junction temperature telemetry, and 100% duty-cycle operation in a thermally optimized HTSSOP package-making it optimal for FPGA/DSP core supplies where validation rigor and thermal visibility are critical.
Availability
EL7554IREZ is available at Aetrix Electronics and suitable for FPGA core supplies, DSP I/O rails, and CPU voltage regulation requiring stable component supply, RoHS-compliant packaging, and long-term industrial temperature support (-40°C to +85°C).
Supply support for EL7554IREZ 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) designs high-performance analog and power management ICs for industrial, computing, and communications markets, with ISO 9001-certified manufacturing.
The EL7554IREZ belongs to Intersil's monolithic synchronous buck regulator product line, engineered specifically for high-current, low-voltage point-of-load applications in FPGA, DSP, and microprocessor systems where thermal visibility, sequencing flexibility, and manufacturing testability are essential.
FAQ
What is the maximum output current capability of the EL7554IREZ?
The EL7554IREZ delivers up to 4A continuous output current under specified conditions (TA ≤ +85°C, proper PCB thermal design with soldered thermal pad and vias). Peak current limit is 6A, but sustained operation above 4A requires derating based on ambient temperature and copper area-see Figure 10 for allowable power dissipation vs. ambient.
Does the EL7554IREZ support external synchronization of its switching frequency?
Yes, the EL7554IREZ operates in constant-frequency PWM mode and supports external synchronization via its oscillator circuit. To implement sync, apply a clean square wave 20% below the device's self-set frequency to the COSC pin through a series resistor; refer to Figure 20 in the FN7360 datasheet for the recommended interface network.
How is the output voltage set on the EL7554IREZ?
The EL7554IREZ uses a resistor divider from VOUT to SGND connected to the FB pin to set output voltage: VO = 0.8V × (1 + R1/R2). Standard values for common outputs (e.g., 1.8V → R1 = 12.7kΩ, R2 = 10.2kΩ) are provided in Table 1 of the datasheet. The VO pin may be used instead of FB for fixed-output configurations.
What is the function of the VTJ pin on the EL7554IREZ?
The VTJ pin provides an analog voltage proportional to junction temperature: VTJ = 1.2V + 3.84mV/°C × TJ. This enables direct die temperature measurement without external sensors-critical for thermal characterization and dynamic derating. A 0.01–0.047µF capacitor to SGND is required for noise filtering.
Can the EL7554IREZ operate with 100% duty cycle, and what is the practical output voltage limit?
Yes, the EL7554IREZ supports true 100% duty cycle due to its CMOS synchronous architecture (PMOS high-side + NMOS low-side). Maximum output is VO ≈ VIN − IO × (RDSON1 + RL), where RDSON1 = 35mΩ (typ.) and RL is inductor DCR. At 4A and 5V input, VO can reach ~4.8V with low-DCR inductor.
EL7554IREZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 4A
- Frequency - Switching:
- 200kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-HTSSOP
EL7554IREZ FAQ
1.How can I place an order for EL7554IREZ through Aetrix?
Please submit a Request for Quotation (RFQ) for EL7554IREZ 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 EL7554IREZ reliable?
The price and inventory of EL7554IREZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EL7554IREZ is usually 5 days.
3.What payment methods are accepted for EL7554IREZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EL7554IREZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EL7554IREZ?
EL7554IREZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EL7554IREZ 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 EL7554IREZ?
For technical support, including EL7554IREZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EL7554IREZ requirements.
6.How does Aetrix verify that EL7554IREZ is sourced from the original manufacturer or authorized distributors?
All EL7554IREZ 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 EL7554IREZ meets industry standards.
7.What is the process for return or replacement of EL7554IREZ?
All EL7554IREZ units undergo pre-shipment inspection (PSI). If there is an issue with EL7554IREZ, 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 EL7554IREZ part is unused and in its original packaging.
Return procedure for EL7554IREZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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