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Renesas EL7564CRE
- Part No.:
- EL7564CRE
- Manufacturer:
- Renesas
- Package:
- 28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
EL7564CRE.pdf
- Description:
- IC REG BUCK ADJ 4A 28HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,405
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Product details
Overview
EL7564CRE from Intersil is a monolithic synchronous step-down DC/DC regulator in 28-pin HTSSOP, delivering 4A continuous output current with adjustable 1.0V–3.8V output voltage, 95% peak efficiency, and integrated MOSFETs for DSP/CPU core power supplies.
For engineers reviewing the EL7564CRE datasheet, EL7564CRE pinout, EL7564CRE application, or EL7564CRE equivalent, this page delivers verified technical context, package-specific thermal behavior, current-mode control architecture, junction temperature monitoring, and power tracking functionality critical for multi-rail sequencing in embedded power systems.
Technical Context
The EL7564CRE implements fixed-frequency current-mode PWM control using patented resistorless on-chip current sensing, enabling cycle-by-cycle current limiting, fast load transient response, and stable operation up to 95% duty cycle. Its oscillator supports external synchronization and adjustable frequency up to 1 MHz via COSC.
It integrates dual NMOS power FETs (30 mΩ typical RDS(on)), bootstrapped high-side gate drive (VHI/VDRV), junction temperature monitoring (VTJ), power good (PG), auxiliary supply tracking (STP/STN), and internal soft start - all optimized for single-board multi-voltage rail designs requiring precise startup sequencing and thermal safety.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4A continuous - supports high-power DSP/CPU core loads without external FETs or heatsinks. |
| Input Voltage Range | 4.5V to 5.5V - tightly specified for stable 5V rail regulation with ±10% tolerance. |
| Output Voltage Range | 1.0V to 3.8V adjustable - set via external resistor divider on FB pin with ±0.5% line/load regulation. |
| Efficiency | Up to 95% - achieved via synchronous rectification and low RDS(on) integrated FETs, reducing conduction loss. |
| Switching Frequency | Adjustable up to 1 MHz - configured by COSC capacitor; supports external sync with ≥20% frequency margin. |
| Junction Temp Threshold | 135°C over-temperature shutdown with 20°C hysteresis - monitored via VTJ pin voltage (1.2V @ 25°C, -3.84mV/°C slope). |
| Thermal Resistance | θJA = 29°C/W (HTSSOP28, soldered thermal pad) - enables 1.5W dissipation at 85°C ambient with no airflow. |
| Power Tracking | STP/STN inputs support linear or offset sequencing of multiple converters - eliminates need for external supervisors. |
Pinout & Package
EL7564CRE uses a thermally enhanced 28-pin HTSSOP package with exposed die pad for PCB soldering. Thermal performance depends critically on pad layout and copper area per JESD51-5 standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF | Bandgap reference bypass | 0.1µF capacitor to SGND stabilizes 1.26V reference; dominant pole for noise rejection. |
| SGND | Signal ground reference | Isolated return for control circuitry; must be separated from PGND and joined at single point. |
| COSC | Oscillator timing node | Connects external capacitor to set switching frequency; supports sync input when driven externally. |
| VDD | Control circuit supply | Powered from VIN via RC filter; supplies internal logic, reference, and oscillator (2–5 mA typical). |
| VTJ | Junction temperature monitor | Analog voltage output (1.2V @ 25°C) used for real-time die temp measurement and thermal management. |
| PGND | Power ground return | Source connection for low-side FET; multiple pins (6,7,8,9,11,12,13,15,16) reduce IR drop and EMI. |
| VIN | Main power input | 4.5–5.5V supply; connects to drain of high-side FET; requires local 0.22µF ceramic bypass. |
| STP / STN | Power tracking inputs | Differential comparator inputs for synchronized startup with other rails; 2µA internal pull-up/down. |
| LX | Inductor switch node | High-current pulsed output (4A peak); drives external inductor; shared across pins 14–23 for low inductance. |
| VHI | High-side gate drive supply | Bootstrapped from VDRV via 0.22µF capacitor; provides ~10V gate drive for high-side NMOS. |
| VDRV | Low-side driver & bootstrap source | Supplies low-side gate drive and charges VHI bootstrap cap; tied to VIN through RC filter. |
| PG | Power good indicator | Open-drain output active high when VOUT is within ±10% of target; drives external enable or reset logic. |
| FB | Feedback voltage input | 125nA internal pull-up forces safe shutdown if floating; connects to resistor divider for output voltage setting. |
| EN | Enable control | Active-high logic input; 2µA internal pull-up enables device if left open; capacitor adds startup delay. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous NMOS FETs | 30 mΩ typical RDS(on) high-side + low-side reduces conduction loss and eliminates external MOSFET layout complexity. |
| Resistorless current sensing | Patented on-die sensing enables true current-mode control without sense resistor, saving board space and improving accuracy. |
| Power tracking (STP/STN) | Enables precise multi-rail sequencing (linear or offset) without external supervisors or discrete comparators. |
| Junction temperature indicator (VTJ) | Provides calibrated analog voltage output for real-time thermal monitoring-replaces external thermal sensors in compact designs. |
| Over-temperature protection | Hardware shutdown at 135°C with 20°C hysteresis ensures reliable operation under sustained overload or poor airflow. |
| Internal soft start | Gradual output ramp prevents inrush current and input voltage droop during power-up; configurable via EN pin capacitor. |
Applications
| DSP Core Power Supply | CPU I/O Voltage Regulation |
|---|---|
|
Use Scenario: Providing clean, sequenced 1.2V/1.8V core voltage to TI C6000 or Analog Devices SHARC DSPs in telecom baseband cards. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with power tracking to coordinate with memory and interface rails. Use Value: Eliminates need for external current-sense resistors and thermal sensors while maintaining ±0.5% output accuracy under 4A dynamic load steps. |
Use Scenario: Delivering 3.3V/2.5V I/O supply to Intel Atom or AMD G-series processors in fanless industrial controllers. IC Role / Device Role / Timing Role: Secondary regulated rail synchronized to core voltage via STP/STN to meet JEDEC tVR timing requirements. Use Value: Achieves <100ns startup delay matching between core and I/O rails using internal tracking-no FPGA-based sequencing logic required. |
| Portable Equipment Power Module | GTL+ Bus Power Supply |
|
Use Scenario: Compact 5V-to-1.5V conversion in handheld test equipment with strict thermal envelope (<10°C rise at 85°C ambient). IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC/DC stage leveraging HTSSOP28 thermal pad for passive cooling. Use Value: Delivers full 4A output with θJA = 29°C/W - enables operation without heatsink or forced airflow in sealed enclosures. |
Use Scenario: Generating 1.2V GTL+ termination voltage for high-speed backplane interfaces in network switches. IC Role / Device Role / Timing Role: Low-noise, fast-transient buck regulator with precision reference and tight load regulation. Use Value: Maintains ±0.5% load regulation across 0–4A, ensuring signal integrity margins for >100MHz GTL+ bus timing. |
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 |
|---|---|---|---|
| ISL8024 | Pin-compatible 4A buck with 2.7–5.5V input, 0.6–5.5V output, and 1MHz max frequency; includes spread-spectrum mode. | Broader input range and lower min output voltage; lacks VTJ monitoring and STP/STN tracking inputs. | Select ISL8024 for wider VIN flexibility and EMI-sensitive applications; retain EL7564CRE where thermal monitoring or multi-rail sequencing is mandatory. |
| TPS544B20 | 4A buck with PMBus interface, 4.5–18V input, 0.6–5.5V output, and integrated telemetry (temp, current, voltage). | Supports digital configuration and telemetry but requires external compensation and has larger QFN-24 package. | Choose TPS544B20 for systems needing programmable margins or telemetry logging; prefer EL7564CRE for analog simplicity and minimal BOM count. |
Compared with ISL8024 and TPS544B20, the EL7564CRE offers unique analog power tracking and junction temperature monitoring in a thermally optimized HTSSOP package-making it optimal for cost-sensitive, thermally constrained, or multi-rail analog sequencing applications where digital control adds unnecessary complexity.
Availability
EL7564CRE is available at Aetrix Electronics and suitable for DSP core supplies, CPU I/O regulation, portable equipment power modules, and GTL+ bus power applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for EL7564CRE 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 DC/DC regulators, precision references, and thermal management solutions.
The EL7564 product line was engineered for high-current, low-voltage embedded power delivery-specifically targeting DSP, CPU, and bus supply requirements where integration, thermal efficiency, and analog sequencing are critical.
FAQ
What is the maximum continuous output current supported by the EL7564CRE?
The EL7564CRE supports 4A continuous output current under specified thermal conditions (θJA ≤ 29°C/W with properly soldered thermal pad). This rating assumes operation within the -40°C to +85°C ambient temperature range, 4.5–5.5V input, and adequate PCB copper area per JESD51-5 guidelines. Peak current limit is 5A with cycle-by-cycle protection.
How does the EL7564CRE implement current-mode control without an external sense resistor?
The EL7564CRE uses a patented on-chip resistorless current sensing technique that monitors inductor current through the high-side NMOS FET's intrinsic conduction characteristics during its on-time. This eliminates external sense resistors while preserving cycle-by-cycle current limiting, accurate load transient response, and stable current-mode loop compensation.
Can the EL7564CRE synchronize its switching frequency to an external clock source?
Yes, the EL7564CRE supports external oscillator synchronization via the COSC pin. To ensure reliable locking, the free-running frequency must be set at least 20% lower than the external sync source frequency using the recommended COSC capacitor value, accommodating component and temperature variations per Figure 23 in FN7297.
What is the function of the VTJ pin on the EL7564CRE, and how is it used?
VTJ is the junction temperature monitor pin on the EL7564CRE, providing a calibrated analog voltage (1.2V at 25°C, decreasing by 3.84mV/°C) proportional to die temperature. It enables real-time thermal monitoring without external sensors and triggers hardware shutdown at 135°C. The voltage can be read by an ADC or comparator for system-level thermal management.
Does the EL7564CRE require external components for soft start, or is it built-in?
The EL7564CRE includes internal soft start with a typical ramp slope of 0.5V/ms. An external capacitor on the EN pin can extend startup time for additional sequencing control, but no external components are required for basic soft start functionality. The internal feature ensures controlled output voltage ramp and prevents inrush current during power-up.
What is the purpose of the STP and STN pins on the EL7564CRE?
STP (tracking positive) and STN (tracking negative) are differential inputs that enable power tracking between multiple EL7564CRE regulators. They allow linear or offset startup sequencing-e.g., ensuring a 1.2V core rail powers up before a 3.3V I/O rail-without external supervisors. Internal 2µA pull-up/down currents simplify standalone use.
EL7564CRE 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):
- 4.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 3.8V
- 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
EL7564CRE FAQ
1.How can I place an order for EL7564CRE through Aetrix?
Please submit a Request for Quotation (RFQ) for EL7564CRE 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 EL7564CRE reliable?
The price and inventory of EL7564CRE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for EL7564CRE is usually 5 days.
3.What payment methods are accepted for EL7564CRE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for EL7564CRE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for EL7564CRE?
EL7564CRE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your EL7564CRE 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 EL7564CRE?
For technical support, including EL7564CRE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your EL7564CRE requirements.
6.How does Aetrix verify that EL7564CRE is sourced from the original manufacturer or authorized distributors?
All EL7564CRE 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 EL7564CRE meets industry standards.
7.What is the process for return or replacement of EL7564CRE?
All EL7564CRE units undergo pre-shipment inspection (PSI). If there is an issue with EL7564CRE, 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 EL7564CRE part is unused and in its original packaging.
Return procedure for EL7564CRE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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